10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________________________________________________________________________________

Form 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED March 31, 2019 OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM TO

Commission file number 1-3701

__________________________________________________________________________________________

AVISTA CORPORATION

(Exact name of Registrant as specified in its charter)

Washington	91-0462470
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1411 East Mission Avenue, Spokane, Washington	99202-2600
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: 509-489-0500

Web site: http://www.myavista.com

None

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days:    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨
Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the

Exchange Act ¨

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):    Yes  ¨    No  x

As of April 29, 2019, 65,750,156 shares of Registrant’s Common Stock, no par value (the only class of common stock), were outstanding.

AVISTA CORPORATION

AVISTA CORPORATION

INDEX

Item No.		Page No.
	Acronyms and Terms	iii
	Forward-Looking Statements	1
	Available Information	4
Part I. Financial Information
Item 1.	Condensed Consolidated Financial Statements	5
	Condensed Consolidated Statements of Income - Three Months Ended March 31, 2019 and 2018	5
	Condensed Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2019 and 2018	6
	Condensed Consolidated Balance Sheets - March 31, 2019 and December 31, 2018	7
	Condensed Consolidated Statements of Cash Flows - Three Months Ended March 31, 2019 and 2018	8
	Condensed Consolidated Statements of Equity - Three Months Ended March 31, 2019 and 2018	10
	Notes to Condensed Consolidated Financial Statements	11
	Note 1. Summary of Significant Accounting Policies	11
	Note 2. New Accounting Standards	12
	Note 3. Balance Sheet Components	13
	Note 4. Revenue	15
	Note 5. Leases	18
	Note 6. Derivatives and Risk Management	21
	Note 7. Pension Plans and Other Postretirement Benefit Plans	25
	Note 8. Income Taxes	26
	Note 9. Committed Lines of Credit	26
	Note 10. Long-Term Debt to Affiliated Trusts	26
	Note 11. Fair Value	27
	Note 12. Common Stock	31
	Note 13. Accumulated Other Comprehensive Loss	31
	Note 14. Earnings per Common Share Attributable to Avista Corporation Shareholders	32
	Note 15. Commitments and Contingencies	32
	Note 16. Information by Business Segments	33
	Note 17. Termination of Proposed Acquisition by Hydro One	34
	Note 18. Assets Held for Sale	36
	Report of Independent Registered Public Accounting Firm	37
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	38
	Business Segments	38
	Executive Level Summary	38
	Regulatory Matters	39
	Results of Operations - Overall	43
	Non-GAAP Financial Measures	44
	Results of Operations - Avista Utilities	44
	Results of Operations - Alaska Electric Light and Power Company	50
	Results of Operations - Other Businesses	51
	Critical Accounting Policies and Estimates	51
	Liquidity and Capital Resources	51
	Overall Liquidity	51

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AVISTA CORPORATION

	Review of Cash Flow Statement	51
	Capital Resources	52
	Capital Expenditures	53
	Off-Balance Sheet Arrangements	53
	Pension Plan	53
	Contractual Obligations	54
	Environmental Issues and Other Contingencies	54
	Enterprise Risk Management	54
	Regional Energy Markets	56
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	56
Item 4.	Controls and Procedures	56
Part II. Other Information
Item 1.	Legal Proceedings	56
Item 1A.	Risk Factors	56
Item 6.	Exhibits	57
	Signature	58

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AVISTA CORPORATION

ACRONYMS AND TERMS

(The following acronyms and terms are found in multiple locations within the document)

Acronym/Term	Meaning
aMW	-	Average Megawatt - a measure of the average rate at which a particular generating source produces energy over a period of time
AEL&P	-	Alaska Electric Light and Power Company, the primary operating subsidiary of AERC, which provides electric services in Juneau, Alaska
AERC	-	Alaska Energy and Resources Company, the Company's wholly-owned subsidiary based in Juneau, Alaska
AFUDC	-	Allowance for Funds Used During Construction; represents the cost of both the debt and equity funds used to finance utility plant additions during the construction period
ASC	-	Accounting Standards Codification
ASU	-	Accounting Standards Update
Avista Capital	-	Parent company to the Company’s non-utility businesses
Avista Corp.	-	Avista Corporation, the Company
Avista Utilities	-	Operating division of Avista Corp. (not a subsidiary) comprising the regulated utility operations in the Pacific Northwest
Capacity	-	The rate at which a particular generating source is capable of producing energy, measured in KW or MW
Cabinet Gorge	-	The Cabinet Gorge Hydroelectric Generating Project, located on the Clark Fork River in Idaho
Colstrip	-	The coal-fired Colstrip Generating Plant in southeastern Montana
Deadband or ERM deadband	-	The first $4.0 million in annual power supply costs above or below the amount included in base retail rates in Washington under the ERM in the state of Washington
EIM	-	Energy Imbalance Market
Energy	-	The amount of electricity produced or consumed over a period of time, measured in KWh or MWh. Also, refers to natural gas consumed and is measured in dekatherms
EPA	-	Environmental Protection Agency
ERM	-	The Energy Recovery Mechanism, a mechanism for accounting and rate recovery of certain power supply costs accepted by the utility commission in the state of Washington
FASB	-	Financial Accounting Standards Board
FCA	-	Fixed Cost Adjustment, the electric and natural gas decoupling mechanism in Idaho
FERC	-	Federal Energy Regulatory Commission
GAAP	-	Generally Accepted Accounting Principles
Hydro One	-	Hydro One Limited, based in Toronto, Ontario, Canada
IPUC	-	Idaho Public Utilities Commission
Juneau	-	The City and Borough of Juneau, Alaska
KW, KWh	-	Kilowatt (1000 watts): a measure of generating output or capability. Kilowatt-hour (1000 watt hours): a measure of energy produced
MPSC	-	Public Service Commission of the State of Montana
MW, MWh	-	Megawatt: 1000 KW. Megawatt-hour: 1000 KWh
Noxon Rapids	-	The Noxon Rapids Hydroelectric Generating Project, located on the Clark Fork River in Montana
OPUC	-	The Public Utility Commission of Oregon
PCA	-	The Power Cost Adjustment mechanism, a procedure for accounting and rate recovery of certain power supply costs accepted by the utility commission in the state of Idaho
PGA	-	Purchased Gas Adjustment
PPA	-	Power Purchase Agreement
RCA	-	The Regulatory Commission of Alaska
REC	-	Renewable energy credit
ROE	-	Return on equity

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AVISTA CORPORATION

ROR	-	Rate of return on rate base
SEC	-	U.S. Securities and Exchange Commission
TCJA	-	The "Tax Cuts and Jobs Act," signed into law on December 22, 2017
Therm	-	Unit of measurement for natural gas; a therm is equal to approximately one hundred cubic feet (volume) or 100,000 BTUs (energy)
Watt	-	Unit of measurement for electricity; a watt is equal to the rate of work represented by a current of one ampere under a pressure of one volt
WUTC	-	Washington Utilities and Transportation Commission

iv

AVISTA CORPORATION

Forward-Looking Statements

From time to time, we make forward-looking statements such as statements regarding projected or future:

• financial performance;

• cash flows;

• capital expenditures;

• dividends;

• capital structure;

• other financial items;

• strategic goals and objectives;

• business environment; and

• plans for operations.

These statements are based upon underlying assumptions (many of which are based, in turn, upon further assumptions). Such statements are made both in our reports filed under the Securities Exchange Act of 1934, as amended (including this Quarterly Report on Form 10-Q), and elsewhere. Forward-looking statements are all statements except those of historical fact including, without limitation, those that are identified by the use of words that include “will,” “may,” “could,” “should,” “intends,” “plans,” “seeks,” “anticipates,” “estimates,” “expects,” “forecasts,” “projects,” “predicts,” and similar expressions.

Forward-looking statements (including those made in this Quarterly Report on Form 10-Q) are subject to a variety of risks, uncertainties and other factors. Most of these factors are beyond our control and may have a significant effect on our operations, results of operations, financial condition or cash flows, which could cause actual results to differ materially from those anticipated in our statements. Such risks, uncertainties and other factors include, among others:

Financial Risk

• weather conditions, which affect both energy demand and electric generating capability, including the impact of precipitation and temperature on hydroelectric resources, the impact of wind patterns on wind-generated power, weather-sensitive customer demand, and similar impacts on supply and demand in the wholesale energy markets;

• our ability to obtain financing through the issuance of debt and/or equity securities, which can be affected by various factors including our credit ratings, interest rates, other capital market conditions and global economic conditions;

• changes in interest rates that affect borrowing costs, our ability to effectively hedge interest rates for anticipated debt issuances, variable interest rate borrowing and the extent to which we recover interest costs through retail rates collected from customers;

• changes in actuarial assumptions, interest rates and the actual return on plan assets for our pension and other postretirement benefit plans, which can affect future funding obligations, pension and other postretirement benefit expense and the related liabilities;

• deterioration in the creditworthiness of our customers;

• the outcome of legal proceedings and other contingencies;

• economic conditions in our service areas, including the economy's effects on customer demand for utility services;

• declining energy demand related to customer energy efficiency, conservation measures and/or increased distributed generation;

• changes in the long-term global climate and the long-term climate within our utilities' service areas, which can affect, among other things, customer demand patterns, the volume and timing of streamflows to our hydroelectric resources, as well as increased risk of severe weather or natural disasters, including wildfires;

• industry and geographic concentrations which may increase our exposure to credit risks due to counterparties, suppliers and customers being similarly affected by changing conditions;

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AVISTA CORPORATION

Utility Regulatory Risk

• state and federal regulatory decisions or related judicial decisions that affect our ability to recover costs and earn a reasonable return including, but not limited to, disallowance or delay in the recovery of capital investments, operating costs, commodity costs, interest rate swap derivatives and discretion over allowed return on investment;

• the loss of regulatory accounting treatment, which could require the write-off of regulatory assets and the loss of regulatory deferral and recovery mechanisms;

Energy Commodity Risk

• volatility and illiquidity in wholesale energy markets, including exchanges, the availability of willing buyers and sellers, changes in wholesale energy prices that can affect operating income, cash requirements to purchase electricity and natural gas, value received for wholesale sales, collateral required of us by individual counterparties and/or exchanges in wholesale energy transactions and credit risk to us from such transactions, and the market value of derivative assets and liabilities;

• default or nonperformance on the part of any parties from whom we purchase and/or sell capacity or energy;

• potential environmental regulations or lawsuits affecting our ability to utilize or resulting in the obsolescence of our power supply resources;

• explosions, fires, accidents, pipeline ruptures or other incidents that may limit energy supply to our facilities or our surrounding territory, which could result in a shortage of commodities in the market that could increase the cost of replacement commodities from other sources;

Operational Risk

• severe weather or natural disasters, including, but not limited to, avalanches, wind storms, wildfires, earthquakes, snow and ice storms, that can disrupt energy generation, transmission and distribution, as well as the availability and costs of fuel, materials, equipment, supplies and support services;

• explosions, fires, accidents, mechanical breakdowns or other incidents that may impair assets and may disrupt operations of any of our generation facilities, transmission, and electric and natural gas distribution systems or other operations and may require us to purchase replacement power;

• explosions, fires, accidents or other incidents arising from or allegedly arising from our operations that may cause wildfires, injuries to the public or property damage;

• blackouts or disruptions of interconnected transmission systems (the regional power grid);

• terrorist attacks, cyberattacks or other malicious acts that may disrupt or cause damage to our utility assets or to the national or regional economy in general, including any effects of terrorism, cyberattacks or vandalism that damage or disrupt information technology systems;

• work force issues, including changes in collective bargaining unit agreements, strikes, work stoppages, the loss of key executives, availability of workers in a variety of skill areas, and our ability to recruit and retain employees;

• increasing costs of insurance, more restrictive coverage terms and our ability to obtain insurance;

• delays or changes in construction costs, and/or our ability to obtain required permits and materials for present or prospective facilities;

• increasing health care costs and cost of health insurance provided to our employees and retirees;

• third party construction of buildings, billboard signs, towers or other structures within our rights of way, or placement of fuel containers within close proximity to our transformers or other equipment, including overbuild atop natural gas distribution lines;

• the loss of key suppliers for materials or services or other disruptions to the supply chain;

• adverse impacts to our Alaska electric utility that could result from an extended outage of its hydroelectric generating resources or their inability to deliver energy, due to their lack of interconnectivity to any other electrical grids and the cost of replacement power (diesel);

• changing river regulation or operations at hydroelectric facilities not owned by us, which could impact our hydroelectric facilities downstream;

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AVISTA CORPORATION

• change in the use, availability or abundancy of water resources and/or rights needed for operation of our hydroelectric facilities;

Compliance Risk

• compliance with extensive federal, state and local legislation and regulation applicable to us, including numerous environmental, health, safety, infrastructure protection, reliability and other laws and regulations that affect our operations and costs;

• the ability to comply with the terms of the licenses and permits for our hydroelectric or thermal generating facilities at cost-effective levels;

Cyber and Technology Risk

• cyberattacks on the operating systems that are used in the operation of our electric generation, transmission and distribution facilities and our natural gas distribution facilities, and cyberattacks on such systems of other energy companies with which we are interconnected, which could damage or destroy facilities or systems or disrupt operations for extended periods of  time and result in the incurrence of liabilities  and costs;

• cyberattacks on the administrative systems that are used in the administration of our business, including customer billing and customer service, accounting, communications, compliance and other administrative functions, and cyberattacks on such systems of our vendors and other companies with which we do business, which could result in the disruption of business operations, the release of private information and the incurrence of liabilities and costs;

• changes in costs that impede our ability to effectively implement new information technology systems or to operate and maintain current production technology;

• changes in technologies, possibly making some of the current technology we utilize obsolete or introducing new cyber security risks;

• insufficient technology skills, which could lead to the inability to develop, modify or maintain our information systems;

Strategic Risk

• growth or decline of our customer base and the extent to which new uses for our services may materialize or existing uses may decline, including, but not limited to, the effect of the trend toward distributed generation at customer sites;

• the potential effects of negative publicity regarding our business practices, whether true or not, which could hurt our reputation and result in litigation or a decline in our common stock price;

• changes in our strategic business plans, which may be affected by any or all of the foregoing, including the entry into new businesses and/or the exit from existing businesses and the extent of our business development efforts where potential future business is uncertain;

• entering into or growth of non-regulated activities may increase earnings volatility;

• potential legal proceedings arising from the termination of the proposed acquisition of the Company by Hydro One;

External Mandates Risk

• changes in environmental laws, regulations, decisions and policies, including present and potential environmental remediation costs and our compliance with these matters;

• the potential effects of initiatives, legislation or administrative rulemaking at the federal, state or local levels, including possible effects on our generating resources or restrictions on greenhouse gas emissions to mitigate concerns over global climate changes;

• political pressures or regulatory practices that could constrain or place additional cost burdens on our distribution systems through accelerated adoption of distributed generation or electric-powered transportation or on our energy supply sources, such as campaigns to halt coal-fired power generation and opposition to other thermal generation, wind turbines or hydroelectric facilities;

• wholesale and retail competition including alternative energy sources, growth in customer-owned power resource technologies that displace utility-supplied energy or that may be sold back to the utility, and alternative energy suppliers and delivery arrangements;

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AVISTA CORPORATION

• failure to identify changes in legislation, taxation and regulatory issues that are detrimental or beneficial to our overall business;

• policy and/or legislative changes in various regulated areas, including, but not limited to, environmental regulation, healthcare regulations and import/export regulations; and

• the risk of municipalization in any of our service territories.

Our expectations, beliefs and projections are expressed in good faith. We believe they are reasonable based on, without limitation, an examination of historical operating trends, our records and other information available from third parties. There can be no assurance that our expectations, beliefs or projections will be achieved or accomplished. Furthermore, any forward-looking statement speaks only as of the date on which such statement is made. We undertake no obligation to update any forward-looking statement or statements to reflect events or circumstances that occur after the date on which such statement is made or to reflect the occurrence of unanticipated events. New risks, uncertainties and other factors emerge from time to time, and it is not possible for us to predict all such factors, nor can we assess the effect of each such factor on our business or the extent that any such factor or combination of factors may cause actual results to differ materially from those contained in any forward-looking statement.

Available Information

Our website address is www.myavista.com. We make annual, quarterly and current reports available on our website as soon as practicable after electronically filing these reports with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC at www.sec.gov. Except for SEC filings or portions thereof that are specifically referred to in this report, information contained on these websites is not part of this report.

4

PART I. Financial Information

Item 1. Condensed Consolidated Financial Statements

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

Avista Corporation

For the Three Months EndedMarch 31

Dollars in thousands, except per share amounts

(Unaudited)

	2019			2018
Operating Revenues:
Utility revenues:
Utility revenues, exclusive of alternative revenue programs	$	393,241		$	408,356
Alternative revenue programs	(4,658		)	(5,939		)
Total utility revenues	388,583			402,417
Non-utility revenues	7,898			6,944
Total operating revenues	396,481			409,361
Operating Expenses:
Utility operating expenses:
Resource costs	137,347			154,618
Other operating expenses	83,978			77,298
Merger transaction costs	19,664			672
Depreciation and amortization	48,914			44,733
Taxes other than income taxes	31,943			30,829
Non-utility operating expenses:
Other operating expenses	7,355			6,824
Depreciation and amortization	209			181
Total operating expenses	329,410			315,155
Income from operations	67,071			94,206
Interest expense	25,651			24,776
Interest expense to affiliated trusts	357			253
Capitalized interest	(928		)	(968		)
Merger termination fee	(103,000		)	—
Other expense (income)-net	(907		)	4,479
Income before income taxes	145,898			65,666
Income tax expense	30,017			10,710
Net income	115,881			54,956
Net income attributable to noncontrolling interests	(87		)	(66		)
Net income attributable to Avista Corp. shareholders	$	115,794		$	54,890
Weighted-average common shares outstanding (thousands), basic	65,733			65,639
Weighted-average common shares outstanding (thousands), diluted	65,941			65,931
Earnings per common share attributable to Avista Corp. shareholders:
Basic	$	1.76		$	0.84
Diluted	$	1.76		$	0.83

The Accompanying Notes are an Integral Part of These Statements.

5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Avista Corporation

For the Three Months EndedMarch 31

Dollars in thousands

(Unaudited)

	2019			2018
Net income	$	115,881		$	54,956
Other Comprehensive Income:
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of $43 and $55 respectively	160			204
Total other comprehensive income	160			204
Comprehensive income	116,041			55,160
Comprehensive income attributable to noncontrolling interests	(87		)	(66		)
Comprehensive income attributable to Avista Corporation shareholders	$	115,954		$	55,094

The Accompanying Notes are an Integral Part of These Statements.

6

CONDENSED CONSOLIDATED BALANCE SHEETS

Avista Corporation

Dollars in thousands

(Unaudited) 

	March 31,			December 31,
	2019			2018
Assets:
Current Assets:
Cash and cash equivalents	$	14,861		$	14,656
Accounts and notes receivable-less allowances of $6,395 and $5,233, respectively	170,200			165,824
Materials and supplies, fuel stock and stored natural gas	61,354			63,881
Regulatory assets	41,566			48,552
Other current assets	60,948			54,010
Assets held for sale	15,874			—
Total current assets	364,803			346,923
Net utility property	4,626,054			4,648,930
Goodwill	52,426			57,672
Non-current regulatory assets	605,497			614,354
Other property and investments-net and other non-current assets	241,203			114,697
Total assets	$	5,889,983		$	5,782,576
Liabilities and Equity:
Current Liabilities:
Accounts payable	$	109,922		$	108,372
Current portion of long-term debt and capital leases	104,989			107,645
Short-term borrowings	119,000			190,000
Regulatory liabilities	55,464			113,209
Other current liabilities	175,454			120,358
Liabilities held for sale	1,813			—
Total current liabilities	566,642			639,584
Long-term debt and capital leases	1,701,207			1,755,529
Long-term debt to affiliated trusts	51,547			51,547
Pensions and other postretirement benefits	218,456			222,537
Deferred income taxes	501,928			487,602
Non-current regulatory liabilities	786,233			780,701
Other non-current liabilities and deferred credits	195,748			71,031
Total liabilities	4,021,761			4,008,531
Commitments and Contingencies (See Notes to Condensed Consolidated Financial Statements)
Equity:
Avista Corporation Shareholders’ Equity:
Common stock, no par value; 200,000,000 shares authorized; 65,749,932 and 65,688,356 shares issued and outstanding, respectively	1,140,242			1,136,491
Accumulated other comprehensive loss	(7,706		)	(7,866		)
Retained earnings	734,774			644,595
Total Avista Corporation shareholders’ equity	1,867,310			1,773,220
Noncontrolling Interests	912			825
Total equity	1,868,222			1,774,045
Total liabilities and equity	$	5,889,983		$	5,782,576

The Accompanying Notes are an Integral Part of These Statements.

7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

Avista Corporation

For the Three Months Ended March 31

Dollars in thousands

(Unaudited)

	2019			2018
Operating Activities:
Net income	$	115,881		$	54,956
Non-cash items included in net income:
Depreciation and amortization	49,123			45,823
Deferred income tax provision and investment tax credits	8,883			(5,049		)
Power and natural gas cost amortizations (deferrals), net	(48,084		)	72
Amortization of debt expense	669			815
Amortization of investment in exchange power	613			613
Stock-based compensation expense	4,845			1,963
Equity-related AFUDC	(1,485		)	(1,392		)
Pension and other postretirement benefit expense	9,084			8,170
Other regulatory assets and liabilities and deferred debits and credits	1,016			2,127
Change in decoupling regulatory deferral	4,471			5,703
Other	(1,943		)	3,778
Contributions to defined benefit pension plan	(7,300		)	(7,300		)
Changes in certain current assets and liabilities:
Accounts and notes receivable	(9,787		)	15,963
Materials and supplies, fuel stock and stored natural gas	(394		)	8,815
Collateral posted for derivative instruments	3,432			18,382
Other current assets	1,705			(473		)
Accounts payable	16,697			(21,997		)
Income taxes payable	19,360			15,432
Other current liabilities	30,095			38,374
Net cash provided by operating activities	196,881			184,775
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(93,615		)	(81,817		)
Issuance of notes receivable at subsidiaries	(200		)	(1,000		)
Repayments of notes receivable at subsidiaries	261			—
Equity and property investments made by subsidiaries	(3,504		)	(3,671		)
Distributions received from investments	149			—
Other	(755		)	(866		)
Net cash used in investing activities	(97,664		)	(87,354		)

The Accompanying Notes are an Integral Part of These Statements.

8

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)

Avista Corporation

For the Three Months Ended March 31

Dollars in thousands

(Unaudited)

	2019			2018
Financing Activities:
Net decrease in short-term borrowings	$	(71,000	)	$	(55,398	)
Maturity of long-term debt and capital leases	(665		)	(3,037		)
Issuance of common stock, net of issuance costs	190			232
Cash dividends paid	(25,615		)	(24,634		)
Other	(896		)	(4,483		)
Net cash used in financing activities	(97,986		)	(87,320		)
Net increase in cash and cash equivalents, including cash classified within current assets held for sale	1,231			10,101
Less: Net increase in cash and cash equivalents classified within current assets held for sale (see Note 18 of Notes to Condensed Consolidated Financial Statements)	1,026			—
Net increase in cash and cash equivalents	205			10,101
Cash and cash equivalents at beginning of period	14,656			16,172
Cash and cash equivalents at end of period	$	14,861		$	26,273

The Accompanying Notes are an Integral Part of These Statements.

9

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

Avista Corporation

For the Three Months Ended March 31

Dollars in thousands

(Unaudited)

	2019			2018
Common Stock, Shares:
Shares outstanding at beginning of period	65,688,356			65,494,333
Shares issued	61,576			174,144
Shares outstanding at end of period	65,749,932			65,668,477
Common Stock, Amount:
Balance at beginning of period	$	1,136,491		$	1,133,448
Equity compensation expense	4,452			1,798
Issuance of common stock, net of issuance costs	190			232
Payment of minimum tax withholdings for share-based payment awards	(891		)	(3,929		)
Balance at end of period	1,140,242			1,131,549
Accumulated Other Comprehensive Loss:
Balance at beginning of period	(7,866		)	(8,090		)
Other comprehensive income	160			204
Reclassification of excess income tax benefits	—			(1,742		)
Balance at end of period	(7,706		)	(9,628		)
Retained Earnings:
Balance at beginning of period	644,595			604,470
Net income attributable to Avista Corporation shareholders	115,794			54,890
Cash dividends paid on common stock	(25,615		)	(24,634		)
Reclassification of excess income tax benefits	—			1,742
Balance at end of period	734,774			636,468
Total Avista Corporation shareholders’ equity	1,867,310			1,758,389
Noncontrolling Interests:
Balance at beginning of period	825			656
Net income attributable to noncontrolling interests	87			66
Cash dividends paid to subsidiary noncontrolling interests	—			(540		)
Balance at end of period	912			182
Total equity	$	1,868,222		$	1,758,571
Dividends declared per common share	$	0.3875		$	0.3725

The Accompanying Notes are an Integral Part of These Statements.

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AVISTA CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

The accompanying condensed consolidated financial statements of Avista Corp. as of and for the interim periods ended March 31, 2019 and March 31, 2018 are unaudited; however, in the opinion of management, the statements reflect all adjustments necessary for a fair statement of the results for the interim periods. All such adjustments are of a normal recurring nature. The condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The Condensed Consolidated Statements of Income for the interim periods are not necessarily indicative of the results to be expected for the full year. These condensed consolidated financial statements do not contain the detail or footnote disclosure concerning accounting policies and other matters which would be included in full fiscal year consolidated financial statements; therefore, they should be read in conjunction with the Company's audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2018 (2018 Form 10-K).

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Business

Avista Corp. is primarily an electric and natural gas utility with certain other business ventures. Avista Utilities is an operating division of Avista Corp., comprising its regulated utility operations in the Pacific Northwest. Avista Utilities provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho. Avista Utilities also provides natural gas distribution service in parts of northeastern and southwestern Oregon. Avista Utilities has electric generating facilities in Washington, Idaho, Oregon and Montana. Avista Utilities also supplies electricity to a small number of customers in Montana, most of whom are employees who operate the Company's Noxon Rapids generating facility.

AERC is a wholly-owned subsidiary of Avista Corp. The primary subsidiary of AERC is AEL&P, which comprises Avista Corp.'s regulated utility operations in Alaska.

Avista Capital, a wholly owned non-regulated subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC. See Note 16 for business segment information. See Note 18 for discussion of assets held for sale at METALfx, an unregulated subsidiary of the Company.

Basis of Reporting

The condensed consolidated financial statements include the assets, liabilities, revenues and expenses of the Company and its subsidiaries and other majority owned subsidiaries and variable interest entities for which the Company or its subsidiaries are the primary beneficiaries. Intercompany balances were eliminated in consolidation. The accompanying condensed consolidated financial statements include the Company’s proportionate share of utility plant and related operations resulting from its interests in jointly owned plants.

Derivative Assets and Liabilities

Derivatives are recorded as either assets or liabilities on the Condensed Consolidated Balance Sheets measured at estimated fair value.

The WUTC and the IPUC issued accounting orders authorizing Avista Corp. to offset energy commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of delivery. Realized benefits and costs result in adjustments to retail rates through PGAs, the ERM in Washington, the PCA mechanism in Idaho, and periodic general rate cases. The resulting regulatory assets associated with energy commodity derivative instruments have been concluded to be probable of recovery through future rates.

Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized unless there is a decline in the fair value of the contract that is determined to be other-than-temporary.

For interest rate swap derivatives, Avista Corp. records all mark-to-market gains and losses in each accounting period as assets and liabilities, as well as offsetting regulatory assets and liabilities, such that there is no income statement impact. The interest rate swap derivatives are risk management tools similar to energy commodity derivatives. Upon settlement of interest rate swap derivatives, the regulatory asset or liability is amortized as a component of interest expense over the term of the associated debt. The Company records an offset of interest rate swap derivative assets and liabilities with regulatory assets and liabilities, based on the prior practice of the commissions to provide recovery through the ratemaking process.

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AVISTA CORPORATION

The Company has multiple master netting agreements with a variety of entities that allow for cross-commodity netting of derivative agreements with the same counterparty (i.e. power derivatives can be netted with natural gas derivatives). In addition, some master netting agreements allow for the netting of commodity derivatives and interest rate swap derivatives for the same counterparty. The Company does not have any agreements which allow for cross-affiliate netting among multiple affiliated legal entities. The Company nets all derivative instruments when allowed by the agreement for presentation in the Condensed Consolidated Balance Sheets.

Fair Value Measurements

Fair value represents the price that would be received when selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Energy commodity derivative assets and liabilities, deferred compensation assets, as well as derivatives related to interest rate swaps and foreign currency exchange contracts, are reported at estimated fair value on the Condensed Consolidated Balance Sheets. See Note 11 for the Company’s fair value disclosures.

Contingencies

The Company has unresolved regulatory, legal and tax issues which have inherently uncertain outcomes. The Company accrues a loss contingency if it is probable that a liability has been incurred and the amount of the loss or impairment can be reasonably estimated. The Company also discloses loss contingencies that do not meet these conditions for accrual if there is a reasonable possibility that a material loss may be incurred. As of March 31, 2019, the Company has not recorded any significant amounts related to unresolved contingencies. See Note 15 for further discussion of the Company's commitments and contingencies.

NOTE 2. NEW ACCOUNTING STANDARDS

ASU No. 2016-02, "Leases (Topic 842)"

ASU No. 2018-01, "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842"

ASU No. 2018-11, "Leases (Topic 842): Targeted Improvements"

On January 1, 2019, the Company adopted ASU No. 2016-02, which outlines a model for entities to use in accounting for leases and supersedes previous lease accounting guidance, as well as several practical expedients in ASU Nos. 2018-01 and 2018-11.

The Company adopted ASU No. 2016-02 utilizing a modified retrospective adoption method with the "package of three" and hindsight practical expedients offered by the standard. The "package of three" provides for an entity to not reassess at adoption whether any expired or existing contracts are deemed, for accounting purposes, to be or contain leases, the classification of any expired or existing leases, and any initial direct costs for any existing leases. As a result, the Company did not apply the new guidance to existing contracts that are or contain leases, and did not reassess the classification of those leases. The Company used the benefit of hindsight in determining both term and impairments associated with any existing leases. Use of this practical expedient has resulted in lease terms that best represent management's expectations with respect to use of the underlying asset but did not result in recognition of any impairment.

The Company elected to adopt ASU No. 2018-01, which allows an entity to exclude from application of Topic 842 all easements executed prior to January 1, 2019. In addition, the Company elected to adopt the "comparatives under 840" practical expedient offered in ASU No. 2018-11, which allows an entity to apply the new lease standard at the adoption date, recognizing any necessary cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption and presenting comparative periods in the financial statements under ASC 840 (previous lease accounting guidance). Adoption of the standard did not result in a cumulative effect adjustment within the Company's financial statements.

As allowed by ASU No. 2016-02, the Company elected not to apply the requirements of the standard to short-term leases, those leases with an initial term of 12 months or less. These leases are not recorded on the balance sheet and are immaterial to the financial statements.

Adoption of the standard impacted the Company's Condensed Consolidated Balance Sheet through recognition of right-of-use (ROU) assets and lease liabilities for the Company's operating leases. Accounting for finance leases (formerly capital leases) remained substantially unchanged, except the Company reclassified the amounts as of December 31, 2018 to conform to the presentation of operating leases as of March 31, 2019. See Note 5 for further information on the Company's leases.

ASU No. 2018-02 “Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”

In February 2018, the FASB issued ASU No. 2018-02, which amended the guidance for reporting comprehensive income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the enactment of the TCJA in December 2017. This ASU became effective for periods beginning after December

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AVISTA CORPORATION

15, 2018 and early adoption was permitted. Upon adoption, the requirements of this ASU must be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the TCJA is recognized. The Company early adopted this standard effective January 1, 2018 and elected to apply the guidance during the period of adoption rather than apply the standard retrospectively. As a result, the Company reclassified $1.7 million in tax benefits from accumulated other comprehensive loss to retained earnings during the three months ended March 31, 2018.

ASU 2018-13 " Fair Value Measurement (Topic 820)"

In August 2018, the FASB issued ASU No. 2018-13, which amends the fair value measurement disclosure requirements of ASC 820. The requirements of this ASU include additional disclosure regarding the range and weighted average used to develop significant unobservable inputs for Level 3 fair value estimates and the elimination of certain other previously required disclosures, such as the narrative description of the valuation process for Level 3 fair value measurements. This ASU is effective for periods beginning after December 15, 2019 and early adoption is permitted. Entities have the option to early adopt the eliminated or modified disclosure requirements and delay the adoption of all the new disclosure requirementsuntil the effective date of the ASU. The Company is in the process of evaluating this standard; however, it has determined that it will not early adopt any portion of this standard as of March 31, 2019.

ASU No. 2018-14 "Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20)"

In August 2018, the FASB issued ASU No. 2018-14, which amends ASC 715 to add, remove and/or clarify certain disclosure requirements related to defined benefit pension and other postretirement plans. The additional disclosure requirements are primarily narrative discussion of significant changes in the benefit obligations and plan assets. The removed disclosures are primarily information about accumulated other comprehensive income expected to be recognized over the next year and the effects of changes associated with assumed health care costs. This ASU is effective for periods beginning after December 15, 2021 and early adoption is permitted. The Company is in the process of evaluating this standard; however, it has determined that it will not early adopt this standard as of March 31, 2019.

NOTE 3. BALANCE SHEET COMPONENTS

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Materials and supplies	$	47,705	$	47,403
Fuel stock	4,930		4,869
Stored natural gas	8,719		11,609
Total	$	61,354	$	63,881

Other Current Assets

Other current assets consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$	37,347	$	26,809
Prepayments	16,647		17,536
Other	6,954		9,665
Total	$	60,948	$	54,010

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AVISTA CORPORATION

Net Utility Property

Net utility property consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Utility plant in service	$	6,202,942	$	6,209,968
Construction work in progress	165,725		160,598
Total	6,368,667		6,370,566
Less: Accumulated depreciation and amortization	1,742,613		1,721,636
Total net utility property	$	4,626,054	$	4,648,930

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Operating lease ROU assets	$	70,834	$	—
Finance lease ROU assets	53,711		—
Non-utility property	29,557		31,355
Equity investments	32,967		29,257
Investment in affiliated trust	11,547		11,547
Notes receivable	11,161		11,073
Deferred compensation assets	8,675		8,400
Other	22,751		23,065
Total	$	241,203	$	114,697

Other Current Liabilities

Other current liabilities consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Accrued taxes other than income taxes	$	49,206	$	36,858
Income taxes payable	20,368		141
Employee paid time off accruals	21,813		20,992
Accrued interest	30,315		16,704
Current portion of pensions and other postretirement benefits	9,503		9,151
Operating lease liabilities	4,120		—
Finance lease liabilities	2,695		—
Utility energy commodity derivative liabilities	4,035		3,908
Other current liabilities	33,399		32,604
Total other current liabilities	$	175,454	$	120,358

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AVISTA CORPORATION

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Operating lease liabilities	$	67,635	$	—
Finance lease liabilities	53,850		—
Deferred investment tax credits	31,383		29,725
Asset retirement obligations	18,455		18,266
Derivative liabilities	10,861		10,300
Other	13,564		12,740
Total	$	195,748	$	71,031

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	28,159	$	11,862	$	41,428	$	16,866
Decoupling surcharge	6,782		8,395		3,408		17,501
Pension and other postretirement benefit plans	—		224,805		—		228,062
Interest rate swaps	—		138,327		—		133,854
Deferred income taxes	—		93,646		—		91,188
Settlement with Coeur d'Alene Tribe	—		42,316		—		42,643
Demand side management programs	—		15,064		—		19,674
Utility plant to be abandoned	—		24,477		—		24,334
Other regulatory assets	6,625		46,605		3,716		40,232
Total regulatory assets	$	41,566	$	605,497	$	48,552	$	614,354
Regulatory Liabilities
Income tax related liabilities	$	29,401	$	421,216	$	27,997	$	425,613
Deferred natural gas costs	1,253		—		40,713		—
Deferral power costs	12,555		26,106		25,072		16,933
Decoupling rebate	1,061		4,664		6,782		204
Utility plant retirement costs	—		300,373		—		297,379
Interest rate swaps	—		20,396		—		28,078
Other regulatory liabilities	11,194		13,478		12,645		12,494
Total regulatory liabilities	$	55,464	$	786,233	$	113,209	$	780,701

NOTE 4. REVENUE

ASC 606 defines the core principle of the revenue recognition model is that an entity should identify the various performance obligations in a contract, allocate the transaction price among the performance obligations and recognize revenue when (or as) the entity satisfies each performance obligation.

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AVISTA CORPORATION

Utility Revenues

Revenue from Contracts with Customers

General

The majority of Avista Corp.’s revenue is from rate-regulated sales of electricity and natural gas to retail customers, which has two performance obligations, (1) having service available for a specified period (typically a month at a time) and (2) the delivery of energy to customers. The total energy price generally has a fixed component (basic charge) related to having service available and a usage-based component, related to the delivery and consumption of energy. The commodity is sold and/or delivered to and consumed by the customer simultaneously, and the provisions of the relevant utility commission authorization determine the charges the Company may bill the customer. Given that all revenue recognition criteria are met upon the delivery of energy to customers, revenue is recognized immediately at that time.

Revenues from contracts with customers are presented in the Condensed Consolidated Statements of Income in the line item "Utility revenues, exclusive of alternative revenue programs."

Non-Derivative Wholesale Contracts

The Company has certain wholesale contracts which are not accounted for as derivatives and, accordingly, are within the scope of ASC 606 and considered revenue from contracts with customers. Revenue is recognized as energy is delivered to the customer or the service is available for a specified period of time, consistent with the discussion of rate-regulated sales above.

Alternative Revenue Programs (Decoupling)

ASC 606 retained existing GAAP associated with alternative revenue programs, which specified that alternative revenue programs are contracts between an entity and a regulator of utilities, not a contract between an entity and a customer. GAAP requires that an entity present revenue arising from alternative revenue programs separately from revenues arising from contracts with customers on the face of the Condensed Consolidated Statements of Income. The Company's decoupling mechanisms (also known as a FCA in Idaho) qualify as alternative revenue programs. Decoupling revenue deferrals are recognized in the Condensed Consolidated Statements of Income during the period they occur (i.e. during the period of revenue shortfall or excess due to fluctuations in customer usage), subject to certain limitations, and a regulatory asset or liability is established that will be surcharged or rebated to customers in future periods. GAAP requires that for any alternative revenue program, like decoupling, the revenue must be expected to be collected from customers within 24 months of the deferral to qualify for recognition in the current period Condensed Consolidated Statement of Income. Any amounts included in the Company's decoupling program that are not expected to be collected from customers within 24 months are not recorded in the financial statements until the period in which revenue recognition criteria are met. The amounts expected to be collected from customers within 24 months represents an estimate that must be made by the Company on an ongoing basis due to it being based on the volumes of electric and natural gas sold to customers on a go-forward basis.

Derivative Revenue

Most wholesale electric and natural gas transactions (including both physical and financial transactions), and the sale of fuel are considered derivatives, which are specifically scoped out of ASC 606. As such, these revenues are disclosed separately from revenue from contracts with customers. Revenue is recognized for these items upon the settlement/expiration of the derivative contract. Derivative revenue includes those transactions that are entered into and settled within the same month.

Other Utility Revenue

Other utility revenue includes rent, revenues from the lineman training school, sales of materials, late fees and other charges that do not represent contracts with customers.Other utility revenue also includes the provision for earnings sharing and the deferral and amortization of refunds to customers associated with the TCJA. This revenue is scoped out of ASC 606, as this revenue does not represent items where a customer is a party that has contracted with the Company to obtain goods or services that are an output of the Company’s ordinary activities in exchange for consideration. As such, these revenues are presented separately from revenue from contracts with customers.

Other Considerations for Utility Revenues

Gross Versus Net Presentation

Revenues and resource costs from Avista Utilities’ settled energy contracts that are “booked out” (not physically delivered) are reported on a net basis as part of derivative revenues.

Utility-related taxes collected from customers (primarily state excise taxes and city utility taxes) are taxes that are imposed on Avista Utilities as opposed to being imposed on its customers; therefore, Avista Utilities is the taxpayer and records these

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AVISTA CORPORATION

transactions on a gross basis in revenue from contracts with customers and operating expense (taxes other than income taxes). The utility-related taxes collected from customers at AEL&P are imposed on the customers rather than AEL&P; therefore, the customers are the taxpayers and AEL&P is acting as their agent. As such, these transactions at AEL&P are presented on a net basis within revenue from contracts with customers.

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2019		2018
Utility-related taxes	$	19,089	$	19,167

Non-Utility Revenues

Revenue from Contracts with Customers

Non-utility revenues from contracts with customers are primarily derived from the operations of METALfx. The contracts associated with METALfx have one performance obligation, the delivery of a product, and revenues are recognized when the risk of loss transfers to the customer, which occurs when products are shipped.

Significant Judgments and Unsatisfied Performance Obligations

The only significant judgments involving revenue recognition are estimates surrounding unbilled revenue and receivables from contracts with customers and estimates surrounding the amount of decoupling revenues that will be collected from customers within 24 months (discussed above).

The Company has certain capacity arrangements, where the Company has a contractual obligation to provide either electric or natural gas capacity to its customers for a fixed fee. Most of these arrangements are paid for in arrears by the customers and do not result in deferred revenue and only result in receivables from the customers. The Company does have one capacity agreement where the customer makes payments throughout the year and depending on the timing of the customer payments, it can result in an immaterial amount of deferred revenue or a receivable from the customer. As of March 31, 2019, the Company estimates it had unsatisfied capacity performance obligations of $9.1 million, which will be recognized as revenue in future periods as the capacity is provided to the customers. These performance obligations are not reflected in the financial statements, as the Company has not received payment for these services.

Disaggregation of Total Operating Revenue

The following table disaggregates total operating revenue by segment and source for the three months ended March 31 (dollars in thousands):

	2019			2018
Avista Utilities
Revenue from contracts with customers	$	354,301		$	354,162
Derivative revenues	24,127			58,392
Alternative revenue programs	(4,658		)	(5,939		)
Deferrals and amortizations for rate refunds to customers	2,135			(19,822		)
Other utility revenues	1,797			1,961
Total Avista Utilities	377,702			388,754
AEL&P
Revenue from contracts with customers	10,736			14,650
Deferrals and amortizations for rate refunds to customers	(48		)	(1,122		)
Other utility revenues	193			135
Total AEL&P	10,881			13,663
Other
Revenue from contracts with customers	7,647			6,729
Other revenues	251			215
Total other	7,898			6,944
Total operating revenues	$	396,481		$	409,361

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AVISTA CORPORATION

Utility Revenue from Contracts with Customers by Type and Service

The following table disaggregates revenue from contracts with customers associated with the Company's utility operations for the three months ended March 31 (dollars in thousands):

	2019						2018
	Avista Utilities		AEL&P		Total Utility		Avista Utilities		AEL&P		Total Utility
ELECTRIC OPERATIONS
Residential	$	115,392	$	5,852	$	121,244	$	114,753	$	6,538	$	121,291
Commercial and governmental	79,245		4,821		84,066		78,909		8,044		86,953
Industrial	25,248		—		25,248		25,119		—		25,119
Public street and highway lighting	1,903		63		1,966		1,859		68		1,927
Total retail revenue	221,788		10,736		232,524		220,640		14,650		235,290
Transmission	5,152		—		5,152		3,830		—		3,830
Other revenue from contracts with customers	8,194		—		8,194		6,291		—		6,291
Total electric revenue from contracts with customers	$	235,134	$	10,736	$	245,870	$	230,761	$	14,650	$	245,411
NATURAL GAS OPERATIONS
Residential	$	77,336	$	—	$	77,336	$	80,653	$	—	$	80,653
Commercial	36,595		—		36,595		37,373		—		37,373
Industrial and interruptible	1,627		—		1,627		1,683		—		1,683
Total retail revenue	115,558		—		115,558		119,709		—		119,709
Transportation	2,484		—		2,484		2,567		—		2,567
Other revenue from contracts with customers	1,125		—		1,125		1,125		—		1,125
Total natural gas revenue from contracts with customers	$	119,167	$	—	$	119,167	$	123,401	$	—	$	123,401

NOTE 5. LEASES

ASC 842, which outlines a model for entities to use in accounting for leases and supersedes previous lease accounting guidance, became effective on January 1, 2019. The core principle of the model is that an entity should recognize the ROU assets and liabilities that arise from leases on the balance sheet and depreciate or amortize the asset and liability over the term of the lease, as well as provide disclosure to enable users of the condensed consolidated financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases.

Significant Judgments and Assumptions

The Company determines if an arrangement is a lease, as well as its classification, at its inception.

ROU assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and lease liabilities are recognized at the commencement date of the agreement based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date to determine the present value of lease payments. The implicit rate is used when it is readily determinable. The operating and finance lease ROU assets also include any lease payments made and exclude lease incentives, if any, that accrue to the benefit of the lessee.

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Any difference between lease expense and cash paid for leased assets is recognized as a regulatory asset or regulatory liability.

Description of Leases

The Company has operating leases for land associated with its utility operations, as well as communication sites which support network and radio communications within its service territory. The Company's leases have remaining terms of 1 to 74 years.

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Most of the Company's leases include options to extend the lease term for periods of 5 to 50 years. Exercise of these options is at the Company's discretion.

The Company has an operating lease with the state of Montana associated with submerged land around the Company's hydroelectric facilities in the Clark Fork River basin, which expires in 2046. The terms of this lease are subject to renegotiation, depending on the outcome of ongoing litigation between Montana and NorthWestern Energy. In addition, the state of Montana and Avista Corp. are engaged in litigation regarding the lease terms. As such, amounts recorded for this lease are uncertain and amounts may change in the future depending on the outcome of the ongoing litigation.

Through its wholly-owned subsidiary, AEL&P, the Company has a PPA which is treated as a finance lease for accounting purposes related to the Snettisham Hydroelectric Project, which expires in 2034. For ratemaking purposes, this lease is treated as an operating lease with a constant level of annual rental expense (straight line rent expense). Because of this regulatory treatment, any difference between the operating lease expense for ratemaking purposes and the expenses recognized under finance lease treatment (interest and amortization of the finance lease ROU asset) is recorded as a regulatory asset and amortized during the later years of the lease when the finance lease expense is less than the operating lease expense included in base rates. In 2018 and prior years, the total cost associated with the Snettisham PPA was included in resource costs. Due to the adoption of the new lease standard, the amortization of the ROU asset is now included in depreciation and amortization and the interest associated with the lease liability is now included in interest expense on the Condensed Consolidated Statement of Income.

Certain of the Company's lease agreements include rental payments which are periodically adjusted over the term of the agreement based on the consumer price index. The Company's lease agreements do not include any material residual value guarantees or material restrictive covenants.

Avista Corp. does not record leases with a term of 12-months or less in the Condensed Consolidated Balance Sheet. Total short-term lease cost for the three months ended March 31, 2019 is immaterial. 

Leases that Have Not Yet Commenced

In March 2019, the Company signed a PPA with Clearway Energy Group (Clearway) to purchase all of the power generated from the Rattlesnake Flat Wind project in Adams County, Washington. The facility has a nameplate capacity of 144 MW and is expected to generate approximately 50 aMW. During negotiations with Clearway, Avista Corp. was involved in the selection of the preferred generation facility type. The PPA is a 20-year agreement with deliveries expected to begin in 2020. The PPA provides Avista Corp. with additional renewable energy, capacity and environmental attributes. Avista Corp. expects to recover the cost of the power purchased through its retail rates. This PPA is considered a lease under ASC 842; however, all of the payments are variable payments based on whether power is generated from the facility. Since all the payments are variable, the Company will not record a lease liability for the agreement, but the expense will be included in resource costs when it becomes operational in 2020.

The components of lease expense were as follows for the three months ended March 31 (dollars in thousands):

	2019
Operating lease cost:
Fixed lease cost (Other operating expenses)	$	1,103
Variable lease cost (Other operating expenses)	243
Total operating lease cost	$	1,346
Finance lease cost:
Amortization of ROU asset (Depreciation and amortization)	$	910
Interest on lease liabilities (Interest expense)	699
Total finance lease cost	$	1,609

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Supplemental cash flow information related to leases was as follows for the three months ended March 31 (dollars in thousands):

	2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows:
Operating lease payments	$	4,092
Interest on finance lease	699
Total operating cash outflows	$	4,791
Finance cash outflows:
Principal payments on finance lease	$	665

Supplemental balance sheet information related to leases was as follows for March 31, 2019 (dollars in thousands):

	March 31,
	2019
Operating Leases
Operating lease ROU assets (Other property and investments-net and other non-current assets)	$	70,834
Other current liabilities	$	4,120
Other non-current liabilities and deferred credits	67,635
Total operating lease liabilities	$	71,755
Finance Leases
Finance lease ROU assets (Other property and investments-net and other non-current assets) (a)	$	53,711
Other current liabilities (b)	$	2,695
Other non-current liabilities and deferred credits (b)	53,850
Total finance lease liabilities	$	56,545
Weighted Average Remaining Lease Term
Operating leases	27.32 years
Finance leases	9.64 years
Weighted Average Discount Rate
Operating leases	3.82		%
Finance leases	4.85		%

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(a) At December 31, 2018, the finance lease ROU assets were included in "Net utility property" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other property and investments-net and other non-current assets" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

(b) At December 31, 2018, the finance lease liabilities were included in "Current portion of long-term debt" and "Long-term debt and capital leases" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other current liabilities" and "Other non-current liabilities and deferred credits" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

Maturities of lease liabilities (including principal and interest) were as follows as of March 31, 2019 (dollars in thousands):

	Operating Leases			Finance Leases
Remainder 2019	$	4,272		$	4,091
2020	4,364			5,462
2021	4,367			5,457
2022	4,375			5,460
2023	4,383			5,456
Thereafter	95,923			54,574
Total lease payments	$	117,684		$	80,500
Less: imputed interest	(45,929		)	(23,955		)
Total	$	71,755		$	56,545

Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):

	Operating Leases		Finance Leases
2019	$	4,995	$	5,455
2020	4,876		5,462
2021	4,859		5,457
2022	4,782		5,460
2023	4,780		5,456
Thereafter	102,389		54,574
Total lease payments	$	126,681	$	81,864
Less: imputed interest	—		(24,654		)
Total	$	126,681	$	57,210

NOTE 6. DERIVATIVES AND RISK MANAGEMENT

Energy Commodity Derivatives

Avista Corp. is exposed to market risks relating to changes in electricity and natural gas commodity prices and certain other fuel prices. Market risk is, in general, the risk of fluctuation in the market price of the commodity being traded and is influenced primarily by supply and demand. Market risk includes the fluctuation in the market price of associated derivative commodity instruments. Avista Corp. utilizes derivative instruments, such as forwards, futures, swap derivatives and options, in order to manage the various risks relating to these commodity price exposures. Avista Corp. has an energy resources risk policy and control procedures to manage these risks.

As part of Avista Corp.'s resource procurement and management operations in the electric business, Avista Corp. engages in an ongoing process of resource optimization, which involves the economic selection from available energy resources to serve Avista Corp.'s load obligations and the use of these resources to capture available economic value through wholesale market transactions. These include sales and purchases of electric capacity and energy, fuel for electric generation, and derivative contracts related to capacity, energy and fuel. Such transactions are part of the process of matching resources with load

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obligations and hedging a portion of the related financial risks. These transactions range from terms of intra-hour up to multiple years.

As part of its resource procurement and management of its natural gas business, Avista Corp. makes continuing projections of its natural gas loads and assesses available natural gas resources including natural gas storage availability. Natural gas resource planning typically includes peak requirements, low and average monthly requirements and delivery constraints from natural gas supply locations to Avista Corp.’s distribution system. However, daily variations in natural gas demand can be significantly different than monthly demand projections. On the basis of these projections, Avista Corp. plans and executes a series of transactions to hedge a portion of its projected natural gas requirements through forward market transactions and derivative instruments. These transactions may extend as much as four natural gas operating years (November through October) into the future. Avista Corp. also leaves a significant portion of its natural gas supply requirements unhedged for purchase in short-term and spot markets.

Avista Corp. plans for sufficient natural gas delivery capacity to serve its retail customers for a theoretical peak day event. Avista Corp. generally has more pipeline and storage capacity than what is needed during periods other than a peak-day. Avista Corp. optimizes its natural gas resources by using market opportunities to generate economic value that helps mitigate fixed costs. Avista Corp. also optimizes its natural gas storage capacity by purchasing and storing natural gas when prices are traditionally lower, typically in the summer, and withdrawing during higher priced months, typically during the winter. However, if market conditions and prices indicate that Avista Corp. should buy or sell natural gas at other times during the year, Avista Corp. engages in optimization transactions to capture value in the marketplace. Natural gas optimization activities include, but are not limited to, wholesale market sales of surplus natural gas supplies, purchases and sales of natural gas to optimize use of pipeline and storage capacity, and participation in the transportation capacity release market.

The following table presents the underlying energy commodity derivative volumes as of March 31, 2019 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases				Sales
	Electric Derivatives		Gas Derivatives		Electric Derivatives		Gas Derivatives
Year	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs
Remainder 2019	30	596	4,640	81,438	109	2,280	669	35,913
2020	—	—	1,138	53,388	123	959	1,430	16,378
2021	—	—	—	15,290	—	246	1,049	4,100
2022	—	—	—	—	—	—	—	—
2023	—	—	—	—	—	—	—	—
Thereafter	—	—	—	—	—	—	—	—

The following table presents the underlying energy commodity derivative volumes as of December 31, 2018 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases				Sales
	Electric Derivatives		Gas Derivatives		Electric Derivatives		Gas Derivatives
Year	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs
2019	206	941	10,732	101,293	197	2,790	2,909	54,418
2020	—	—	1,138	47,225	123	959	1,430	14,625
2021	—	—	—	9,670	—	—	1,049	4,100
2022	—	—	—	—	—	—	—	—
2023	—	—	—	—	—	—	—	—
Thereafter	—	—	—	—	—	—	—	—

(1) Physical transactions represent commodity transactions in which Avista Corp. will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

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The electric and natural gas derivative contracts above will be included in either power supply costs or natural gas supply costs during the period they are delivered and will be included in the various deferral and recovery mechanisms (ERM, PCA and PGAs), or in the general rate case process, and are expected to be collected through retail rates from customers.

Foreign Currency Exchange Derivatives

A significant portion of Avista Corp.’s natural gas supply (including fuel for power generation) is obtained from Canadian sources. Most of those transactions are executed in U.S. dollars, which avoids foreign currency risk. A portion of Avista Corp.’s short-term natural gas transactions and long-term Canadian transportation contracts are committed based on Canadian currency prices and settled within 60 days with U.S. dollars. Avista Corp. hedges a portion of the foreign currency risk by purchasing Canadian currency exchange derivatives when such commodity transactions are initiated. The foreign currency exchange derivatives and the unhedged foreign currency risk have not had a material effect on Avista Corp.’s financial condition, results of operations or cash flows and these differences in cost related to currency fluctuations are included with natural gas supply costs for ratemaking.

The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Number of contracts	22		31
Notional amount (in United States dollars)	$	6,681	$	4,018
Notional amount (in Canadian dollars)	8,917		5,386

Interest Rate Swap Derivatives

Avista Corp. is affected by fluctuating interest rates related to a portion of its existing debt, and future borrowing requirements. Avista Corp. hedges a portion of its interest rate risk with financial derivative instruments, which may include interest rate swap derivatives and U.S. Treasury lock agreements. These interest rate swap derivatives and U.S. Treasury lock agreements are considered economic hedges against fluctuations in future cash flows associated with anticipated debt issuances.

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2019 and December 31, 2018 (dollars in thousands):

Balance Sheet Date	Number of Contracts	Notional Amount		Mandatory Cash Settlement Date
March 31, 2019	6	$	70,000	2019
	6	60,000		2020
	2	25,000		2021
	8	90,000		2022
December 31, 2018	6	$	70,000	2019
	6	60,000		2020
	2	25,000		2021
	7	80,000		2022

Upon settlement of interest rate swap derivatives, the cash payments made or received are recorded as a regulatory asset or liability and are subsequently amortized as a component of interest expense over the life of the associated debt. The settled interest rate swap derivatives are also included as a part of Avista Corp.'s cost of debt calculation for ratemaking purposes.

The fair value of outstanding interest rate swap derivatives can vary significantly from period to period depending on the total notional amount of swap derivatives outstanding and fluctuations in market interest rates compared to the interest rates fixed by the swaps. Avista Corp. is required to make cash payments to settle the interest rate swap derivatives when the fixed rates are higher than prevailing market rates at the date of settlement. Conversely, Avista Corp. receives cash to settle its interest rate swap derivatives when prevailing market rates at the time of settlement exceed the fixed swap rates.

Summary of Outstanding Derivative Instruments

The amounts recorded on the Condensed Consolidated Balance Sheet as of March 31, 2019 and December 31, 2018 reflect the offsetting of derivative assets and liabilities where a legal right of offset exists.

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AVISTA CORPORATION

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2019 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	15	$	(15	)	$	—	$	—
Interest rate swap derivatives
Other current assets	2,587		(530		)	—		2,057
Other property and investments-net and other non-current assets	2,503		(1,754		)	—		749
Other current liabilities	—		(524		)	—		(524		)
Other non-current liabilities and deferred credits	—		(12,402		)	2,860		(9,542		)
Energy commodity derivatives
Other current assets	262		(12		)	—		250
Other current liabilities	26,875		(55,284		)	24,374		(4,035		)
Other non-current liabilities and deferred credits	4,349		(16,211		)	10,543		(1,319		)
Total derivative instruments recorded on the balance sheet	$	36,591	$	(86,732	)	$	37,777	$	(12,364	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2018 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	—	$	(45	)	$	—	$	(45	)
Interest rate swap derivatives
Other current assets	5,283		—			—		5,283
Other property and investments-net and other non-current assets	5,283		(440		)	—		4,843
Other non-current liabilities and deferred credits	—		(7,391		)	530		(6,861		)
Energy commodity derivatives
Other current assets	400		(130		)	—		270
Other current liabilities	31,457		(73,155		)	37,790		(3,908		)
Other non-current liabilities and deferred credits	4,426		(21,292		)	13,427		(3,439		)
Total derivative instruments recorded on the balance sheet	$	46,849	$	(102,453	)	$	51,747	$	(3,857	)

Exposure to Demands for Collateral

Avista Corp.'s derivative contracts often require collateral (in the form of cash or letters of credit) or other credit enhancements, or reductions or terminations of a portion of the contract through cash settlement. In the event of a downgrade in Avista Corp.'s credit ratings or changes in market prices, additional collateral may be required. In periods of price volatility, the level of exposure can change significantly. As a result, sudden and significant demands may be made against Avista Corp.'s credit facilities and cash. Avista Corp. actively monitors the exposure to possible collateral calls and takes steps to mitigate capital requirements.

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The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Energy commodity derivatives
Cash collateral posted	$	72,264	$	78,025
Letters of credit outstanding	56,100		6,500
Balance sheet offsetting (cash collateral against net derivative positions)	34,917		51,217
Interest rate swap derivatives
Cash collateral posted	2,860		530
Balance sheet offsetting (cash collateral against net derivative positions)	2,860		530

Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Energy commodity derivatives
Liabilities with credit-risk-related contingent features	$	1,406	$	2,193
Additional collateral to post	1,415		2,193
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features	15,210		7,831
Additional collateral to post	10,064		6,579

NOTE 7. PENSION PLANS AND OTHER POSTRETIREMENT BENEFIT PLANS

Avista Utilities

Avista Utilities’ maintained the same pension and other postretirement plans during the three months ended March 31, 2019 as those described as of December 31, 2018. The Company’s funding policy is to contribute at least the minimum amounts that are required to be funded under the Employee Retirement Income Security Act, but not more than the maximum amounts that are currently deductible for income tax purposes. The Company contributed $7.3 million in cash to the pension plan for the three months ended March 31, 2019 and it expects to contribute a total of $22.0 million in 2019.

The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

	Pension Benefits						Other Postretirement Benefits
	2019			2018			2019			2018
Service cost (a)	$	4,874		$	5,450		$	772		$	804
Interest cost	7,138			6,466			1,372			1,197
Expected return on plan assets	(7,815		)	(8,250		)	(718		)	(500		)
Amortization of prior service cost	75			75			(275		)	(815		)
Net loss recognition	2,415			2,088			1,246			1,655
Net periodic benefit cost	$	6,687		$	5,829		$	2,397		$	2,341

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(a) Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 40 percent of all labor and benefits is capitalized to utility property and 60 percent is expensed to utility other operating expenses.

NOTE 8. INCOME TAXES

The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):

	2019					2018
Federal income taxes at statutory rates	$	30,639		21.0	%	$	13,790		21.0	%
Increase (decrease) in tax resulting from:
Tax effect of regulatory treatment of utility plant differences	(2,080		)	(1.4	)	(1,018		)	(1.6	)
State income tax expense	1,659			1.1		964			1.5
Acquisition costs	(1,824		)	(1.2	)	46			0.1
Settlement of equity awards	612			0.4		(990		)	(1.5	)
Other	1,011			0.7		(2,082		)	(3.2	)
Total income tax expense	$	30,017		20.6	%	$	10,710		16.3	%

NOTE 9. COMMITTED LINES OF CREDIT

Avista Corp.

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million that expires in April 2021. The committed line of credit is secured by non-transferable first mortgage bonds of the Company issued to the agent bank that would only become due and payable in the event, and then only to the extent, that the Company defaults on its obligations under the committed line of credit.

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,			December 31,
	2019			2018
Balance outstanding at end of period (1)	$	119,000		$	190,000
Letters of credit outstanding at end of period	$	60,103		$	10,503
Average interest rate at end of period	3.31		%	3.18		%

(1) As of March 31, 2019 and December 31, 2018, the balance outstanding was classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

AEL&P

AEL&P has a committed line of credit in the amount of $25.0 million that expires in November 2019. As of March 31, 2019 and December 31, 2018, there were no borrowings or letters of credit outstanding under this committed line of credit. The committed line of credit is secured by non-transferable first mortgage bonds of AEL&P issued to the agent bank that would only become due and payable in the event, and then only to the extent, that AEL&P defaults on its obligations under the committed line of credit.

NOTE 10. LONG-TERM DEBT TO AFFILIATED TRUSTS

In 1997, the Company issued Floating Rate Junior Subordinated Deferrable Interest Debentures, Series B, with a principal amount of $51.5 million to Avista Capital II, an affiliated business trust formed by the Company. Avista Capital II issued $50.0 million of Preferred Trust Securities with a floating distribution rate of LIBOR plus 0.875 percent, calculated and reset quarterly.

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AVISTA CORPORATION

The distribution rates paid were as follows during the three months ended March 31, 2019 and the year ended December 31, 2018:

	March 31,		December 31,
	2019		2018
Low distribution rate	3.50	%	2.36	%
High distribution rate	3.61	%	3.61	%
Distribution rate at the end of the period	3.50	%	3.61	%

Concurrent with the issuance of the Preferred Trust Securities, Avista Capital II issued $1.5 million of Common Trust Securities to the Company. The Preferred Trust Securities may be redeemed at the option of Avista Capital II at any time and mature on June 1, 2037. In December 2000, the Company purchased $10.0 million of these Preferred Trust Securities.

The Company owns 100 percent of Avista Capital II and has solely and unconditionally guaranteed the payment of distributions on, and redemption price and liquidation amount for, the Preferred Trust Securities to the extent that Avista Capital II has funds available for such payments from the respective debt securities. Upon maturity or prior redemption of such debt securities, the Preferred Trust Securities will be mandatorily redeemed. The Company does not include these capital trusts in its consolidated financial statements as Avista Corp. is not the primary beneficiary. As such, the sole assets of the capital trusts are $51.5 million of junior subordinated deferrable interest debentures of Avista Corp., which are reflected on the Condensed Consolidated Balance Sheets. Interest expense to affiliated trusts in the Condensed Consolidated Statements of Income represents interest expense on these debentures.

NOTE 11. FAIR VALUE

The carrying values of cash and cash equivalents, accounts and notes receivable, accounts payable, and short-term borrowings are reasonable estimates of their fair values. Long-term debt (including current portion and material capital leases) and long-term debt to affiliated trusts are reported at carrying value on the Condensed Consolidated Balance Sheets.

The fair value hierarchy prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to fair values derived from unobservable inputs (Level 3 measurement).

The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities. Active markets are those in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 – Pricing inputs are other than quoted prices in active markets included in Level 1, but which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace.

Level 3 – Pricing inputs include significant inputs that are generally unobservable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value.

Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The determination of the fair values incorporates various factors that not only include the credit standing of the counterparties involved and the impact of credit enhancements (such as cash deposits and letters of credit), but also the impact of Avista Corp.’s nonperformance risk on its liabilities.

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The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Long-term debt (Level 2)	$	1,053,500	$	1,155,199	$	1,053,500	$	1,142,292
Long-term debt (Level 3)	767,000		734,742		767,000		734,742
Snettisham finance lease obligation (Level 3)	56,545		56,900		57,210		55,600
Long-term debt to affiliated trusts (Level 3)	51,547		38,145		51,547		38,145

These estimates of fair value of long-term debt and long-term debt to affiliated trusts were primarily based on available market information, which generally consists of estimated market prices from third party brokers for debt with similar risk and terms. The price ranges obtained from the third party brokers consisted of par values of 74.00 to 121.59, where a par value of 100.0 represents the carrying value recorded on the Condensed Consolidated Balance Sheets. Level 2 long-term debt represents publicly issued bonds with quoted market prices; however, due to their limited trading activity, they are classified as Level 2 because brokers must generate quotes and make estimates if there is no trading activity near a period end. Level 3 long-term debt consists of private placement bonds and debt to affiliated trusts, which typically have no secondary trading activity. Fair values in Level 3 are estimated based on market prices from third party brokers using secondary market quotes for debt with similar risk and terms to generate quotes for Avista Corp. bonds. Due to the unique nature of the Snettisham capital lease obligation, the estimated fair value of these items was determined based on a discounted cash flow model using available market information. The Snettisham capital lease obligation was discounted to present value using the Morgan Markets A Ex-Fin discount rate as published on March 31, 2019.

The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018 at fair value on a recurring basis (dollars in thousands):

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
March 31, 2019
Assets:
Energy commodity derivatives	$	—	$	31,363	$	—	$	(31,113	)	$	250
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		123		(123		)	—
Foreign currency exchange derivatives	—		15		—		(15		)	—
Interest rate swap derivatives	—		5,090		—		(2,284		)	2,806
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)	1,758		—		—		—			1,758
Equity securities (2)	6,456		—		—		—			6,456
Total	$	8,214	$	36,468	$	123	$	(33,535	)	$	11,270
Liabilities:
Energy commodity derivatives	$	—	$	68,668	$	—	$	(66,030	)	$	2,638
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		2,227		(123		)	2,104
Power exchange agreement	—		—		612		—			612
Foreign currency exchange derivatives	—		15		—		(15		)	—
Interest rate swap derivatives	—		15,210		—		(5,144		)	10,066
Total	$	—	$	83,893	$	2,839	$	(71,312	)	$	15,420

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AVISTA CORPORATION

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
December 31, 2018
Assets:
Energy commodity derivatives	$	—	$	36,252	$	—	$	(35,982	)	$	270
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		31		(31		)	—
Interest rate swap derivatives	—		10,566		—		(440		)	10,126
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)	1,745		—		—		—			1,745
Equity securities (2)	6,157		—		—		—			6,157
Total	$	7,902	$	46,818	$	31	$	(36,453	)	$	18,298
Liabilities:
Energy commodity derivatives	$	—	$	89,283	$	—	$	(87,199	)	$	2,084
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		2,805		(31		)	2,774
Power exchange agreement	—		—		2,488		—			2,488
Power option agreement	—		—		1		—			1
Foreign currency exchange derivatives	—		45		—		—			45
Interest rate swap derivatives	—		7,831		—		(970		)	6,861
Total	$	—	$	97,159	$	5,294	$	(88,200	)	$	14,253

(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.

(2) These assets are included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.

The difference between the amount of derivative assets and liabilities disclosed in respective levels in the table above and the amount of derivative assets and liabilities disclosed on the Condensed Consolidated Balance Sheets is due to netting arrangements with certain counterparties. See Note 6 for additional discussion of derivative netting.

To establish fair value for energy commodity derivatives, the Company uses quoted market prices and forward price curves to estimate the fair value of energy commodity derivative instruments included in Level 2. In particular, electric derivative valuations are performed using market quotes, adjusted for periods in between quotable periods. Natural gas derivative valuations are estimated using New York Mercantile Exchange pricing for similar instruments, adjusted for basin differences, using market quotes. Where observable inputs are available for substantially the full term of the contract, the derivative asset or liability is included in Level 2.

To establish fair values for interest rate swap derivatives, the Company uses forward market curves for interest rates for the term of the swaps and discounts the cash flows back to present value using an appropriate discount rate. The discount rate is calculated by third party brokers according to the terms of the swap derivatives and evaluated by the Company for reasonableness, with consideration given to the potential non-performance risk by the Company. Future cash flows of the interest rate swap derivatives are equal to the fixed interest rate in the swap compared to the floating market interest rate multiplied by the notional amount for each period.

To establish fair value for foreign currency derivatives, the Company uses forward market curves for Canadian dollars against the US dollar and multiplies the difference between the locked-in price and the market price by the notional amount of the derivative. Forward foreign currency market curves are provided by third party brokers. The Company's credit spread is factored into the locked-in price of the foreign exchange contracts.

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Deferred compensation assets and liabilities represent funds held by the Company in a Rabbi Trust for an executive deferral plan. These funds consist of actively traded equity and bond funds with quoted prices in active markets. The balance disclosed in the table above excludes cash and cash equivalents of $0.5 million as of March 31, 2019 and December 31, 2018.

Level 3 Fair Value

Under the power exchange agreement the Company purchases power at a price that is based on the average operating and maintenance (O&M) charges from three surrogate nuclear power plants around the country. To estimate the fair value of this agreement, the Company estimates the difference between the purchase price based on the future O&M charges and forward prices for energy. The Company compares the Level 2 brokered quotes and forward price curves described above to an internally developed forward price which is based on the average O&M charges from the three surrogate nuclear power plants for the current year. The Company estimates the volumes of the transactions that will take place in the future based on historical average transaction volumes per delivery year (November to April). Significant increases or decreases in any of these inputs in isolation would result in a significantly higher or lower fair value measurement.

For the natural gas commodity exchange agreement, the Company uses the same Level 2 brokered quotes described above; however, the Company also estimates the purchase and sales volumes (within contractual limits) as well as the timing of those transactions. Changing the timing of volume estimates changes the timing of purchases and sales, impacting which brokered quote is used. Because the brokered quotes can vary significantly from period to period, the unobservable estimates of the timing and volume of transactions can have a significant impact on the calculated fair value. The Company currently estimates volumes and timing of transactions based on a most likely scenario using historical data. Historically, the timing and volume of transactions have not been highly correlated with market prices and market volatility.

The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of March 31, 2019 (dollars in thousands):

	Fair Value (Net) at
	March 31, 2019			Valuation Technique	Unobservable Input	Range
Power exchange agreement	$	(612	)	Surrogate facility pricing	O&M charges	$40.05-$52.59/MWh (1)
					Transaction volumes	28,860 MWhs
Natural gas exchange agreement	$	(2,104	)	Internally derived weighted average cost of gas	Forward purchase prices	$1.70 - $2.98/mmBTU
					Forward sales prices	$1.63 - $4.11/mmBTU
					Purchase volumes	270,000 - 310,000 mmBTUs
					Sales volumes	60,000 - 310,000 mmBTUs

(1) The average O&M charges for the delivery year beginning in November 2018 are $45.61 per MWh.

The valuation methods, significant inputs and resulting fair values described above were developed by the Company's management and are reviewed on at least a quarterly basis to ensure they provide a reasonable estimate of fair value each reporting period.

The following table presents activity for energy commodity derivative assets (liabilities) measured at fair value using significant unobservable inputs (Level 3) for the three months ended March 31 (dollars in thousands):

	Natural Gas Exchange Agreement			Power Exchange Agreement			Total
Three months ended March 31, 2019:
Balance as of January 1, 2019	$	(2,774	)	$	(2,488	)	$	(5,262	)
Total gains or (losses) (realized/unrealized):
Included in regulatory assets/liabilities (1)	8,977			(1,018		)	7,959
Settlements	(8,307		)	2,894			(5,413		)
Ending balance as of March 31, 2019 (2)	$	(2,104	)	$	(612	)	$	(2,716	)

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AVISTA CORPORATION

	Natural Gas Exchange Agreement			Power Exchange Agreement			Total
Three months ended March 31, 2018:
Balance as of January 1, 2018	$	(3,164	)	$	(13,245	)	$	(16,409	)
Total gains or (losses) (realized/unrealized):
Included in regulatory assets/liabilities (1)	203			(1,877		)	(1,674		)
Settlements	156			4,959			5,115
Ending balance as of March 31, 2018 (2)	$	(2,805	)	$	(10,163	)	$	(12,968	)

(1) All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.

(2) There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.

NOTE 12. COMMON STOCK

The Company has entered into four separate sales agency agreements under which the sales agents may offer and sell new shares of the Company’s common stock from time to time. No shares were issued under these agreements during the three months endedMarch 31, 2019. These agreements provide for the offering of a maximum of approximately 3.8 million shares, of which approximately 1.1 million remain unissued as of March 31, 2019. Subject to the satisfaction of customary conditions, the Company has the right to increase the maximum number of shares that may be offered under these agreements.

NOTE 13. ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,048 and $2,091, respectively	$	7,706	$	7,866

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands).

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components	2019			2018			Affected Line Item in Statement of Income
Amortization of defined benefit pension items
Amortization of net prior service cost	$	(200	)	$	(228	)	(a)
Amortization of net loss	3,661			2,995			(a)
Adjustment due to effects of regulation	(3,258		)	(2,508		)	(a)
	203			259			Total before tax
	(43		)	(55		)	Tax expense
	$	160		$	204		Net of tax

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).

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AVISTA CORPORATION

NOTE 14. EARNINGS PER COMMON SHARE ATTRIBUTABLE TO AVISTA CORP. SHAREHOLDERS

The following table presents the computation of basic and diluted earnings per common share attributable to Avista Corp. shareholders for the three months ended March 31 (in thousands, except per share amounts):

	2019		2018
Numerator:
Net income attributable to Avista Corp. shareholders	$	115,794	$	54,890
Denominator:
Weighted-average number of common shares outstanding-basic	65,733		65,639
Effect of dilutive securities:
Performance and restricted stock awards	208		292
Weighted-average number of common shares outstanding-diluted	65,941		65,931
Earnings per common share attributable to Avista Corp. shareholders:
Basic	$	1.76	$	0.84
Diluted	$	1.76	$	0.83

There were no shares excluded from the calculation because they were antidilutive.

NOTE 15. COMMITMENTS AND CONTINGENCIES

In the course of its business, the Company becomes involved in various claims, controversies, disputes and other contingent matters, including the items described in this Note. Some of these claims, controversies, disputes and other contingent matters involve litigation or other contested proceedings. For all such matters, the Company intends to vigorously protect and defend its interests and pursue its rights. However, no assurance can be given as to the ultimate outcome of any particular matter because litigation and other contested proceedings are inherently subject to numerous uncertainties. For matters that affect Avista Utilities’ or AEL&P's operations, the Company intends to seek, to the extent appropriate, recovery of incurred costs through the ratemaking process.

Cabinet Gorge Total Dissolved Gas Abatement Plan

Dissolved atmospheric gas levels (referred to as "Total Dissolved Gas" or "TDG") in the Clark Fork River exceed state of Idaho and federal water quality numeric standards downstream of Cabinet Gorge particularly during periods when excess river flows must be diverted over the spillway. Under the terms of the Clark Fork Settlement Agreement (CFSA) as incorporated in Avista Corp.’s FERC license for the Clark Fork Project, Avista Corp. has worked in consultation with agencies, tribes and other stakeholders to address this issue. Under the terms of a gas supersaturation mitigation plan, Avista Corp. is reducing TDG by constructing spill crest modifications on spill gates at the dam. These modifications have been shown to be effective in reducing TDG downstream. TDG monitoring and analysis is ongoing. Under the terms of the mitigation plan, Avista Corp. will continue to work with stakeholders to determine the degree to which TDG abatement reduces future mitigation obligations. The Company has sought, and will continue to seek recovery, through the ratemaking process, of all operating and capitalized costs related to this issue.

Legal Proceedings Related to the Terminated Acquisition by Hydro One

See Note 17 for information regarding the termination of the proposed acquisition of the Company by Hydro One.

In connection with the now terminated acquisition, three lawsuits were filed in the United States District Court for the Eastern District of Washington and were subsequently voluntarily dismissed by the plaintiffs.

One lawsuit was filed in the Superior Court for the State of Washington in and for Spokane County, captioned as follows:

• Fink v. Morris, et al., No. 17203616-6 (filed September 15, 2017, amended complaint filed October 25, 2017).

The complaint generally alleged that the members of the Board of Directors of Avista Corp. breached their fiduciary duties by, among other things, conducting an allegedly inadequate sale process and agreeing to the acquisition at a price that allegedly undervalued Avista Corporation, and that Hydro One Limited, Olympus Holding Corp., and Olympus Corp. aided and abetted those purported breaches of duty. The complaint sought various remedies, including monetary damages, attorneys’ fees and expenses. Subsequent to the termination of the proposed acquisition in January 2019, the complaint was voluntarily dismissed by the plaintiffs.

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AVISTA CORPORATION

2015 Washington General Rate Cases

In January 2016, the Company received an order (Order 05) that concluded its electric and natural gas general rate cases that were originally filed with the WUTC in February 2015. New electric and natural gas rates were effective on January 11, 2016.

WUTC Order Denying Industrial Customers of Northwest Utilities / Public Counsel Joint Motion for Clarification, WUTC Staff Motion to Reconsider and WUTC Staff Motion to Reopen Record

In January 2016, the Industrial Customers of Northwest Utilities, the Public Counsel Unit of the Washington State Office of the Attorney General (PC) and the WUTC Staff, which is a separate party in the general rate case proceedings from the WUTC Advisory Staff, filed Motions for Clarification requesting the WUTC to clarify their attrition adjustment and the end result electric revenue amounts. The Motions for Clarification suggested that the electric revenue decrease should have been significantly larger than what was included in Order 05.

In February 2016, the WUTC issued an order (Order 06) denying the Motions summarized above and affirming Order 05, including an $8.1 million decrease in electric base revenue.

PC Petition for Judicial Review

In March 2016, PC filed in Thurston County Superior Court a Petition for Judicial Review of the WUTC's Order 05 and Order 06 described above. In April 2016, this matter was certified for review directly by the Court of Appeals, an intermediate appellate court in the State of Washington.

On August 7, 2018, the Court of Appeals issued a "Published Opinion" (Opinion) which concluded that the WUTC's use of an attrition allowance to calculate Avista Corp.'s rate base violated Washington law. In the Opinion, the Court stated that because the projected additions to rate base in the future were not "used and useful" for service at the time the request for the rate increase was made, they may not lawfully be included in the Company's rate base to justify a rate increase. Accordingly, the Court concluded that the WUTC erred in including an attrition allowance in the calculation of Avista Corp.’s electric and natural gas rate base. The Court noted, however, that the law does not prohibit an attrition allowance in the calculation, for ratemaking purposes, of recoverable operating and maintenance expense. Since the WUTC order provided one lump sum attrition allowance without distinguishing what portion was for rate base and which was for operating and maintenance expenses or other considerations, the Court struck all portions of the attrition allowance attributable to Avista Corp.'s rate base and reversed and remanded the case for the WUTC to recalculate Avista Corp.’s rates without including an attrition allowance in the calculation of rate base. On October 1, 2018, the Court of Appeals terminated its review of this case, remanding it back to the Thurston County Superior Court. On April 17, 2019, the Thurston County Superior Court issued a Remand Order, granting a Joint Motion of Avista Corp., PC and the WUTC to remand the case back to the WUTC. A pre-hearing conference which will set forth the procedural schedule will be held on May 17, 2019.

The total attrition allowance approved by the WUTC in Order 05 and reaffirmed in Order 06 was $35.2 million, with $28.3 million related to electric and $6.9 million related to natural gas. The Company believes the potential amount to return to customers is limited to the 2015 general rate cases because in subsequent Washington general rate cases (specifically those approved in April 2018), the WUTC did not include any attrition allowance on rate base. Even though the Company believes the issue only relates to the 2015 general rate cases, the Company cannot predict the outcome of this matter at this time and cannot estimate how much, if any, of the attrition allowance may be removed from the general rate cases or if other amounts from subsequent general rate cases will be included.

Other Contingencies

In the normal course of business, the Company has various other legal claims and contingent matters outstanding. The Company believes that any ultimate liability arising from these actions will not have a material impact on its financial condition, results of operations or cash flows. It is possible that a change could occur in the Company’s estimates of the probability or amount of a liability being incurred. Such a change, should it occur, could be significant. See "Note 20 of the Notes to Consolidated Financial Statements" in the 2018 Form 10-K for additional discussion regarding other contingencies.

NOTE 16. INFORMATION BY BUSINESS SEGMENTS

The business segment presentation reflects the basis used by the Company's management to analyze performance and determine the allocation of resources. The Company's management evaluates performance based on income (loss) from operations before income taxes as well as net income (loss) attributable to Avista Corp. shareholders. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Avista Utilities' business is managed based on the total regulated utility operation; therefore, it is considered one segment. AEL&P is a separate reportable business segment,

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AVISTA CORPORATION

as it has separate financial reports that are reviewed in detail by the Chief Operating Decision Maker and its operations and risks are sufficiently different from Avista Utilities and the other businesses at AERC that it cannot be aggregated with any other operating segments. The Other category, which is not a reportable segment, includes other investments and operations of various subsidiaries, as well as certain other operations of Avista Capital.

The following table presents information for each of the Company’s business segments (dollars in thousands):

	Avista Utilities		Alaska Electric Light and Power Company			Total Utility		Other			Intersegment Eliminations (1)			Total
For the three months ended March 31, 2019:
Operating revenues	$	377,702	$	10,881		$	388,583	$	7,898		$	—		$	396,481
Resource costs	138,712		(1,365		)	137,347		—			—			137,347
Other operating expenses (2)	100,583		3,059			103,642		7,355			—			110,997
Depreciation and amortization	46,507		2,407			48,914		209			—			49,123
Income from operations	60,224		6,513			66,737		334			—			67,071
Interest expense (3)	24,264		1,596			25,860		588			(440		)	26,008
Income taxes	28,544		1,363			29,907		110			—			30,017
Net income attributable to Avista Corp. shareholders	111,901		3,552			115,453		341			—			115,794
Capital expenditures (4)	92,309		1,306			93,615		162			—			93,777
For the three months ended March 31, 2018:
Operating revenues	$	388,754	$	13,663		$	402,417	$	6,944		$	—		$	409,361
Resource costs	151,665		2,953			154,618		—			—			154,618
Other operating expenses (2)	75,139		2,831			77,970		6,824			—			84,794
Depreciation and amortization	43,267		1,466			44,733		181			—			44,914
Income (loss) from operations	88,145		6,122			94,267		(61		)	—			94,206
Interest expense (3)	23,965		894			24,859		335			(165		)	25,029
Income taxes	10,417		1,464			11,881		(1,171		)	—			10,710
Net income (loss) attributable to Avista Corp. shareholders	55,540		3,772			59,312		(4,422		)	—			54,890
Capital expenditures (4)	81,176		641			81,817		214			—			82,031
Total Assets:
As of March 31, 2019: (5)	$	5,524,962	$	275,488		$	5,800,450	$	107,398		$	(17,865	)	$	5,889,983
As of December 31, 2018:	$	5,458,104	$	272,950		$	5,731,054	$	87,050		$	(35,528	)	$	5,782,576

(1) Intersegment eliminations reported as interest expense represent intercompany interest.

(2) Other operating expenses for Avista Utilities for the three months ended March 31, 2019 include merger transaction costs of $19.7 million, which are separately disclosed on the Condensed Consolidated Statements of Income. The three months ended March 31, 2018 include merger transaction costs of $0.7 million, which are also separately disclosed.

(3) Including interest expense to affiliated trusts.

(4) The capital expenditures for the other businesses are included in other investing activities on the Condensed Consolidated Statements of Cash Flows.

(5) The total assets for Other as of March 31, 2019 includes $15.9 million in assets held for sale related to the sale of METALfx. See Note 18 for further discussion.

NOTE 17. TERMINATION OF PROPOSED ACQUISITION BY HYDRO ONE

On July 19, 2017, Avista Corp. entered into a Merger Agreement that provided for Avista Corp. to become an indirect, wholly-owned subsidiary of Hydro One, subject to the satisfaction or waiver of specified closing conditions, including approval by regulatory agencies. Hydro One, based in Toronto, is Ontario’s largest electricity transmission and distribution provider.

At the effective time of the acquisition, each share of Avista Corp. common stock issued and outstanding, other than shares of Avista Corp. common stock that are owned by Hydro One and its affiliates, were to be converted automatically into the right to receive an amount in cash equal to $53, without interest.

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AVISTA CORPORATION

Denial by Regulatory Commissions

The closing of the acquisition was subject to various conditions, including, among others, receipt of regulatory approval from the WUTC, IPUC, MPSC, OPUC, and the RCA.

Washington - On March 27, 2018, Avista Corp. and Hydro One filed an all-parties (including the WUTC Staff), all-issues settlement agreement with the WUTC recommending approval of the acquisition of the Company by Hydro One. The settlement agreement was subject to WUTC approval.

On December 5, 2018, the Company and Hydro One received a decision from the WUTC, denying the proposed acquisition. On December 17, 2018, the Company and Hydro One filed a petition requesting that the WUTC reconsider its December 5, 2018 order denying approval of the acquisition, together with a petition requesting that the WUTC rehear the matter to accept new evidence. Under Washington State law, the WUTC had 20 days to act on the petition for reconsideration.

On January 8, 2019, the WUTC provided notice of its deemed denial by operation of law of the filed petition to reconsider the denial of approval for the acquisition. The WUTC did not take action on the petition within the required 20 days of its filing so the petition was automatically denied under the state's Administrative Procedure Act. In the same notice, the WUTC also denied the petition for a rehearing on the basis that it does not apply.

Idaho -On April 13, 2018, Avista Corp. and Hydro One filed an all-issues settlement agreement (to which the IPUC Staff was a party) with the IPUC recommending approval of the acquisition of the Company by Hydro One. The settlement agreement was subject to IPUC approval.

On January 3, 2019, the Company and Hydro received a decision from the IPUC, finding that the proposed acquisition was not permitted by Idaho law. Avista Corp. and Hydro One had until January 24, 2019 to file a petition for reconsideration with the IPUC, which they did not file.

Oregon - On May 25, 2018, Avista Corp. and Hydro One filed an all-parties (including the OPUC Staff), all-issues settlement agreement with the OPUC related to the Oregon merger proceeding. The settlement agreement was subject to review and approval by the OPUC.

On January 15, 2019, due to the denial of the acquisition by the WUTC and IPUC, the OPUC issued an order suspending indefinitely the procedural schedule in its merger docket until Hydro One and Avista Corp. informed the OPUC that they had sought a reversal of the denial decisions through appeal or other means that would provide a justiciable issue for the OPUC to address.

Termination of the Merger Agreement

On January 23, 2019, Avista Corp., Hydro One and certain subsidiaries thereof, entered into a Termination Agreement indicating their mutual agreement to terminate the Merger Agreement, effective immediately. Pursuant to the terms of the Termination Agreement, Hydro One paid Avista Corp. a $103 million termination fee on January 24, 2019. The termination fee was used for reimbursing the Company's transaction costs incurred from 2017 to 2019. The balance of the termination fee remaining after payment of 2019 transaction costs and applicable income taxes was used for general corporate purposes and reduced the Company's need for external financing. The 2019 costs totaled $19.7 million pre-tax and included financial advisers' fees, legal fees, consulting fees and employee time.

Other Information Related to the Terminated Acquisition

Due to the termination of the acquisition, all the financial commitments that were included in the various settlement agreements with the commissions for the proposed acquisition will not be required to be performed or observed.

The Company incurred significant transaction costs consisting primarily of consulting, banking fees, legal fees and employee time, and these costs are not being passed through to customers. When the Company was assuming the transaction was going to be completed, a significant portion of these costs were not deductible for income tax purposes. Now that the transaction has been terminated, the Company expects more of the previously incurred transaction costs to be deductible so it expects additional tax benefits from these costs in 2019.

See Note 15 for discussion of shareholder lawsuits filed against the Company, the Company’s directors, Hydro One, Olympus Holding Corp., and Olympus Corp. in relation to the Merger Agreement and the proposed acquisition.

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AVISTA CORPORATION

NOTE 18. ASSETS HELD FOR SALE

In April 2019, Bay Area Manufacturing, Inc., a non-regulated subsidiary of Avista Corp., entered into a definitive agreement to sell its interest in METALfx to an independent third party. The transaction is a stock sale for a total cash purchase price of $17.5 million plus cash on-hand, subject to customary closing adjustments. The transaction closed on April 18, 2019, and as of that date the Company has no further involvement with METALfx.

The purchase price of $17.5 million, as adjusted, was divided among the security holders of METALfx, including the minority shareholder, pro rata based on ownership (Avista Corp. owned 89.2 percent of the equity of METALfx). $1.2 million (7 percent of the purchase price) will be held in escrow for 24 months from the closing of the transaction to satisfy certain indemnification obligations under the purchase agreement.

When all escrow amounts are released, based on preliminary estimates, the sales transaction is expected to provide cash proceeds to Avista Corp., net of payments to the minority holder, contractually obligated compensation payments and other transaction expenses, of $16.6 million and result in a net gain after-tax of $2.4 million. The Company expects to receive the full amount of its portion of the escrow accounts; therefore, the full amounts are included in the gain calculation.

Prior to the completion of the sales transaction, METALfx was not a reportable business segment and was included in other in the business segment footnote at Note 16. As of March 31, 2019, the assets of METALfx met the criteria for held for sale presentation; however, this transaction does not meet the criteria for discontinued operations as it does not represent a strategic shift that will have a major effect on the Company's ongoing operations. The Company elected to present the required held for sale information below, rather than modifying the Condensed Consolidated Balance Sheet. The major classes of assets and liabilities that were held for sale as of March 31, 2019 were as follows (dollars in thousands):

	March 31, 2019
Assets:
Current Assets:
Cash and cash equivalents	$	1,026
Accounts and notes receivable-less allowances of $5	3,048
Materials and supplies	2,922
Other current assets	159
Total current assets	7,155
Goodwill	5,247
Deferred income taxes (1)	1,598
Other property and investments-net and other non-current assets	1,874
Total assets	$	15,874
Liabilities:
Current Liabilities:
Accounts payable	$	760
Other current liabilities	901
Total current liabilities	1,661
Other non-current liabilities	152
Total liabilities	$	1,813

(1) On a standalone basis, METALfx has a deferred tax asset; however, on a consolidated basis, Avista Corp. has a net deferred tax liability which does not include the deferred tax asset above.

36

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and Board of Directors of

Avista Corporation

Spokane, Washington

Results of Review of Interim Financial Information

We have reviewed the accompanying condensed consolidated balance sheet of Avista Corporation and subsidiaries (the "Company") as of March 31, 2019, the related condensed consolidated statements of income, comprehensive income, equity and cash flows, for the three-month periods ended March 31, 2019 and 2018, and the related notes (collectively referred to as the "interim financial information"). Based on our reviews, we are not aware of any material modifications that should be made to the accompanying interim financial information for it to be in conformity with accounting principles generally accepted in the United States of America.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheet of the Company as of December 31, 2018, and the related consolidated statements of income, comprehensive income, equity, and cash flows for the year then ended (not presented herein); and in our report dated February 19, 2019, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of December 31, 2018, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

Basis for Review Results

This interim financial information is the responsibility of the Company's management. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our reviews in accordance with standards of the PCAOB. A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the PCAOB, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

/s/ Deloitte & Touche LLP

Seattle, Washington

May 1, 2019

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AVISTA CORPORATION

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Management’s Discussion and Analysis of Financial Condition and Results of Operations has been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q. The interim Management’s Discussion and Analysis of Financial Condition and Results of Operations does not contain the full detail or analysis which would be included in a full fiscal year Form 10-K; therefore, it should be read in conjunction with the Company's 2018 Form 10-K.

Business Segments

Our business segments have not changed during the three months ended March 31, 2019. See the 2018 Form 10-K as well as “Note 16 of the Notes to Condensed Consolidated Financial Statements” for further information regarding our business segments.

The following table presents net income (loss) attributable to Avista Corp. shareholders for each of our business segments (and the other businesses) for the three months ended March 31 (dollars in thousands):

	2019		2018
Avista Utilities	$	111,901	$	55,540
AEL&P	3,552		3,772
Other	341		(4,422		)
Net income attributable to Avista Corp. shareholders	$	115,794	$	54,890

Executive Level Summary

Overall Results

Net income attributable to Avista Corp. shareholders was $115.8 million for the three months ended March 31, 2019, an increase from $54.9 million for the three months ended March 31, 2018.

The increase in earnings was due to an increase in earnings at Avista Utilities and our other businesses, partially offset by a decrease in earnings at AEL&P.

Avista Utilities' earnings increased due to the receipt of a $103 million termination fee from Hydro One, as well as the positive impact of general rate increases and customer growth. These increases were partially offset by final transaction costs for the Hydro One transaction, taxes associated with the termination fee, increased net power supply costs, transmission and distribution operating and maintenance costs (other operating expenses), depreciation and amortization, and interest expense.

AEL&P earnings decreased primarily due to an increase in other operating expenses.

The increase in earnings at our other businesses was primarily because the first quarter of 2018 included an impairment of one of our investments and expenses associated with a renovation project. Also, there were increased earnings from equity investments in the first quarter of 2019 as compared to the first quarter of 2018.

More detailed explanations of the fluctuations are provided in the results of operations and business segment discussions (Avista Utilities, AEL&P, and the other businesses) that follow this section.

General Rate Cases and Regulatory Lag

We expect to experience regulatory lag during the period 2019 through 2021 due to the delay in general rate case filings related to the terminated Hydro One transaction and our continued investment in utility infrastructure. On April 30, 2019 we filed general rates cases in Washington that are two-year rate plans. We also filed a general rate case in Oregon in March and we expect to file general rate cases in Idaho in the second quarter of 2019. We expect these cases to provide rate relief in early 2020 and begin reducing the regulatory lag that we have been experiencing. Going forward, we will continue to strive to reduce the regulatory timing lag and more closely align our earned returns with those authorized by 2022. This will require adequate and timely rate relief in our jurisdictions. See "Regulatory Matters" for additional discussion of the 2019 general rate cases.

Termination of the Proposed Acquisition by Hydro One

In July 2017, Avista Corp. entered into a Merger Agreement that provided for Avista Corp. to become an indirect, wholly-owned subsidiary of Hydro One, subject to the satisfaction or waiver of specified closing conditions, including approval by regulatory agencies.

On January 23, 2019, Avista Corp., Hydro One and certain subsidiaries thereof, entered into a termination agreement (Termination Agreement) indicating their mutual agreement to terminate the Merger Agreement, effective immediately. Pursuant to the terms of the Merger Agreement and the Termination Agreement, Hydro One paid Avista Corp. a $103 million

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termination fee on January 24, 2019. The termination fee was used for reimbursing our transaction costs incurred from 2017 to 2019. These costs, including income taxes, total approximately $51 million. The balance of the termination fee was used for general corporate purposes and reduced our need for external financing. For further information, see "Note 17 of the Notes to Condensed Consolidated Financial Statements.”

Regulatory Matters

General Rate Cases

We regularly review the need for electric and natural gas rate changes in each state in which we provide service. We expect to continue to file for rate adjustments to:

• seek recovery of operating costs and capital investments, and

• seek the opportunity to earn reasonable returns as allowed by regulators.

With regards to the timing and plans for future filings, the assessment of our need for rate relief and the development of rate case plans takes into consideration short-term and long-term needs, as well as specific factors that can affect the timing of rate filings. Such factors include, but are not limited to, in-service dates of major capital investments and the timing of changes in major revenue and expense items.

Avista Utilities

Washington General Rate Cases

2015 General Rate Cases

In January 2016 we received an order which was reaffirmed by the WUTC in February 2016 that concluded our electric and natural gas general rate cases originally filed with the WUTC in February 2015. New electric and natural gas rates were effective on January 11, 2016.

The WUTC-approved rates were designed to provide a 1.6 percent, or $8.1 million, decrease in electric base revenue and a 7.4 percent, or $10.8 million, increase in natural gas base revenue. The WUTC also approved an ROR of 7.29 percent, with a common equity ratio of 48.5 percent and a 9.5 percent ROE.

In March 2016, the Public Counsel Unit of the Washington State Office of the Attorney General filed in Thurston County Superior Court a Petition for Judicial Review of the WUTC's orders (described above) that concluded our 2015 electric and natural gas general rate cases. In April 2016, this matter was certified for review directly by the Court of Appeals, an intermediate appellate court in the State of Washington.

On August 7, 2018, the Court of Appeals issued an Opinion which concluded that the WUTC's use of an attrition allowance to calculate Avista Corp.'s rate base violated Washington law. The Court struck all portions of the attrition allowance attributable to Avista Corp.’s rate base and reversed and remanded the case for the WUTC to recalculate Avista Corp.’s rates without including an attrition allowance in the calculation of rate base. On April 17, 2019, the Thurston County Superior Court issued a Remand Order, granting a Joint Motion of Avista Corp., PC and the WUTC to remand the case back to the WUTC. A pre-hearing conference which will set forth the procedural schedule will be held on May 17, 2019.

The total attrition allowance approved by the WUTC was $35.2 million, with $28.3 million related to electric and $6.9 million related to natural gas. The Company cannot predict the outcome of this matter at this time and cannot estimate how much, if any, of the attrition allowance may be removed from the general rate cases. See "Note 15 of the Notes to Condensed Consolidated Financial Statements" for further discussion of this matter.

2017 General Rate Cases

On April 26, 2018, the WUTC issued a final order in our electric and natural gas general rate cases that were originally filed on May 26, 2017. In the order, the WUTC approved new electric rates, effective on May 1, 2018, that increased base rates by 2.2 percent (designed to increase electric revenues by $10.8 million). The net increase in electric base rates was made up of an increase in our base revenue requirement of $23.2 million, an increase of $14.5 million in power supply costs and a decrease of $26.9 million for the impacts of the TCJA, which reflects the federal income tax rate change from 35 percent to 21 percent and the amortization of the regulatory liability for plant excess deferred income taxes that was recorded as of December 31, 2017. 

While the WUTC authorized an increase in the ERM baseline to reflect increased power supply costs, it directed the parties to examine the functionality and rationale of the Company's power cost modeling and adjust the baseline only in extraordinary circumstances if necessary to more closely match the baseline to actual conditions.

For natural gas, the WUTC approved new natural gas base rates, effective on May 1, 2018, that decreased base rates by 2.4 percent (designed to decrease natural gas revenues by $2.1 million). The net decrease in natural gas base rates was made up of

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an increase in base revenues of $3.4 million that was offset by a decrease of $5.5 million for the impacts from the TCJA, which reflects the federal income tax rate change and the amortization of the regulatory liability for plant-related excess deferred income taxes that was recorded as of December 31, 2017.

In addition to the above, the WUTC also ordered, effective June 1, 2018, a one-year temporary reduction of $7.9 million in our revenue requirements for electric and $3.2 million for natural gas, reflecting reductions for the return of tax benefits associated with the non-plant excess deferred income taxes and the customer refund liability that was established in 2018 related to the change in federal income tax expense for the period January 1, 2018 to April 30, 2018.

The new rates are based on a ROR of 7.50 percent with a common equity ratio of 48.5 percent and a 9.5 percent ROE.

In our original filings, we requested three-year rate plans for electric and natural gas; however, in the final order the WUTC only provided for new rates effective on May 1, 2018.

TCJA Proceedings

In February 2019, we filed an all-party settlement agreement with the WUTC related to the electric tax benefits associated with the TCJA that were set aside for Colstrip in the 2017 general rate case order (effective May 1, 2018). In the settlement agreement, the parties agreed to utilize $10.9 million of the electric tax benefits to offset costs associated with accelerating the depreciation of Colstrip Units 3 & 4, to reflect a remaining useful life of those units through December 31, 2027. That portion of the settlement agreement was denied. The WUTC has indicated that it will review the TCJA and Colstrip in our next general rate case (which was filed on April 30, 2019). The settlement agreement is subject to WUTC approval.

2019 General Rate Cases

On April 30, 2019, we filed electric and natural gas general rate cases with the WUTC that are two-year rate plans. We have requested the following electric and natural gas base rate changes each year, which are designed to result in the following increases in annual revenues (dollars in millions):

	Electric				Natural Gas
Effective Date	Revenue Increase		Base Rate Increase		Revenue Increase		Base Rate Increase
April 1, 2020	$	45.8	9.1	%	$	12.9	13.8	%
April 1, 2021	$	18.9	3.5	%	$	6.5	6.1	%

Our requests are based on a proposed ROR of 7.52 percent with a common equity ratio of 50 percent and a 9.9 percent ROE. The WUTC has up to 11 months to review our request and issue a decision.

Under these rate plans, we would not file new general rate cases for new rates to be effective prior to April 1, 2022.

The purpose of our general rate case requests is to recover costs associated with the need to replace infrastructure that has reached the end of its useful life and make technology investments required to build the integrated energy services grid.

Among the projects included in the filing are:

• The upgrade of generating units and other equipment at our Little Falls Dam, which will provide more generating capacity.

• Our distribution grid modernization program that rebuilds and upgrades electric feeders in the system, replacing old equipment like poles, conductor, and transformers to improve service reliability, capture energy efficiency savings and improve operational ability.

• Ongoing management and replacement of electric distribution wood poles through our wood pole management program.

• The ongoing project to systematically replace portions of natural gas distribution pipe in our service area that were installed prior to 1987, as well as replacement of other natural gas service equipment.

• The rebuild of a high voltage transmission line, including the installation of steel poles and crossarms.

• Technology upgrades that support necessary business processes and operational efficiencies.

As a part of these general rate cases, we are also seeking to extend our electric and natural gas decoupling mechanisms for an additional five years (through March 31, 2025).

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Idaho General Rate Cases

2017 General Rate Cases

On December 28, 2017, the IPUC approved a settlement agreement between us and other parties to our electric and natural gas general rate cases. New rates were effective on January 1, 2018 and January 1, 2019.

The settlement agreement is a two-year rate plan and has the following electric and natural gas base rate changes each year, which are designed to result in the following increases in annual revenues (dollars in millions):

	Electric				Natural Gas
Effective Date	Revenue Increase		Base Rate Increase		Revenue Increase		Base Rate Increase
January 1, 2018	$	12.9	5.2	%	$	1.2	2.9	%
January 1, 2019	$	4.5	1.8	%	$	1.1	2.7	%

The settlement agreement is based on a ROR of 7.61 percent with a common equity ratio of 50 percent and a 9.5 percent ROE.

As part of the two-year rate plan the Company will not file a new general rate case for a new rate plan to be effective prior to January 1, 2020.

TCJA Proceedings

On May 31, 2018, the IPUC approved an all-party settlement agreement related to the income tax benefits associated with the TCJA. Effective June 1, 2018, through separate tariff schedules, until such time as these changes can be reflected in base rates within the next general rate case, current customer rates were reduced to reflect the reduction of the federal income tax rate to 21 percent, and the amortization of the regulatory liability for plant-related excess deferred income taxes. This reduction reduces annual electric rates by $13.7 million (or 5.3 percent reduction to base rates) and natural gas rates by $2.6 million (or 6.1 percent reduction to base rates).

In March 2019, the IPUC approved an all-party settlement agreement related to the electric tax benefits that were set aside for Colstrip in the 2017 general rate case order. In the approved settlement agreement, the parties agreed to utilize approximately $6.4 million of the electric tax benefits to offset costs associated with accelerating the depreciation of Colstrip Units 3 & 4, to reflect a remaining useful life of those units through December 31, 2027. The remaining tax benefits of approximately $5.8 million will be returned to customers through a temporary rate reduction over a period of one year beginning on April 1, 2019. The tax benefits being utilized are related to non-plant excess deferred income taxes, and the customer refund liability that was established in 2018 related to the change in federal income tax expense for the period January 1, 2018 to May 31, 2018.

2019 General Rate Cases

We expect to file electric and natural gas general rate cases with the IPUC in the second quarter of 2019.

Oregon General Rate Cases

2019 General Rate Case

On March 15, 2019 we filed a natural gas general rate case with the OPUC. We have requested an overall increase in base natural gas rates of 7.8 percent (designed to increase annual natural gas revenues by $6.7 million). Our request is based on a proposed ROR of 7.55 percent with a common equity ratio of 50 percent and a 9.9 percent ROE. The OPUC has up to 10 months to review our request and issue a decision.

TCJA Proceedings

In February 2019, the OPUC approved the deferral amount of $3.8 million related to 2018 income tax benefits associated with the TCJA. The 2018 deferred benefits will be returned to customers through a temporary rate reduction over a period of one year beginning March 1, 2019. We will continue the deferral of the TCJA benefits during 2019 for later return to customers, until such time as these changes can be reflected in base rates.

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Petition for Judicial Review of the Deferral of Capital Projects

In February 2019 and October 2018, the OPUC issued orders which concluded that, contrary to the OPUC's past practice, Oregon statutes that authorize the deferral of expense for later recovery from customers do not authorize the OPUC to allow deferrals of any costs related to capital investments (utility plant). In April 2019, Avista Corp. and other petitioners filed a Petition for Judicial Review with the Oregon Court of Appeals seeking review of the above OPUC orders. The Company cannot predict the outcome of this matter at this time, including whether or not any decision of the court would have retroactive effect.

AMI Project

In March 2016, the WUTC granted our Petition for an Accounting Order to defer and include in a regulatory asset the undepreciated value of our existing Washington electric meters for the opportunity for later recovery. This accounting treatment is related to our plans to replace approximately 253,000 of our existing electric meters with new two-way digital meters and the related software and support services through our AMI project in Washington State. As of March 31, 2019, the estimated future undepreciated value for the existing electric meters is $20.7 million. In September 2017, the WUTC also approved our request to defer the undepreciated net book value of existing natural gas encoder receiver transmitters (ERT) (consistent with the accounting treatment we obtained on our existing electric meters) that will be retired as part of the AMI project. As of March 31, 2019, the estimated future undepreciated value for the existing natural gas ERTs is $3.8 million. Replacement of the electric meters and natural gas ERTs began during the second half of 2018 and is ongoing.

In September 2017, the WUTC approved a Petition to defer the depreciation expense associated with the AMI project, along with a carrying charge, and to seek recovery of the deferral and carrying charge in a future general rate case. Cost savings, such as reduced meter reading costs, will occur during the implementation period, and will offset a portion of the AMI costs not being deferred.

In May 2017, we filed Petitions with the IPUC and the OPUC requesting a depreciable life of 12.5 years for the meter data management system (MDM) related to the AMI project. Both the IPUC and the OPUC approved our request. In addition, in connection with the 2017 Idaho electric general rate case (discussed above), the settling parties agreed to cost recovery of Idaho's share of the MDM system, effective January 1, 2019. In connection with the approval of the Oregon general rate case settlement (discussed above), the OPUC approved cost recovery of Oregon's share of the MDM system, effective November 1, 2017.

Avista Utilities

Purchased Gas Adjustments

PGAs are designed to pass through changes in natural gas costs to Avista Utilities' customers with no change in utility margin (operating revenues less resource costs) or net income. In Oregon, we absorb (cost or benefit) 10 percent of the difference between actual and projected natural gas costs included in retail rates for supply that is not hedged. Total net deferred natural gas costs among all jurisdictions were a liability of $1.3 million as of March 31, 2019 and a liability of $40.7 million as of December 31, 2018. These deferred natural gas costs balances represent amounts due to customers.

Power Cost Deferrals and Recovery Mechanisms

The ERM is an accounting method used to track certain differences between Avista Utilities' actual power supply costs, net of wholesale sales and sales of fuel, and the amount included in base retail rates for our Washington customers. See the 2018 Form 10-K for a full discussion of the mechanics of the ERM and the various sharing bands. Total net deferred power costs under the ERM were a liability of $34.8 million as of March 31, 2019, compared to a liability of $34.4 million as of December 31, 2018. These deferred power cost balances represent amounts due to customers. Pursuant to WUTC requirements, should the cumulative deferral balance exceed $30 million in the rebate or surcharge direction, we must make a filing with the WUTC to adjust customer rates to either return the balance to customers or recover the balance from customers.

Under the ERM, Avista Utilities makes an annual filing on or before April 1 of each year to provide the opportunity for the WUTC staff and other interested parties to review the prudence of and audit the ERM deferred power cost transactions for the prior calendar year. The cumulative rebate balance exceeds $30 million, as a result, our 2019 filing contained a proposed rate refund, effective July 1, 2019 over a three-year period. We anticipate filing a motion during the second quarter of 2019 to consolidate this ERM filing with our 2019 Washington general rate case (which was filed on April 30, 2019). In our motion, we will request that the WUTC withhold the refund associated with the ERM for use in the 2019 general rate case rather than passing it back to customers over the three-year period that was proposed in the ERM filing.

Avista Utilities has a PCA mechanism in Idaho that allows us to modify electric rates on October 1 of each year with IPUC approval. Under the PCA mechanism, we defer 90 percent of the difference between certain actual net power supply expenses and the amount included in base retail rates for our Idaho customers. The October 1 rate adjustments recover or rebate power supply costs deferred during the preceding July-June twelve-month period. Total net power supply costs deferred under the

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PCA mechanism were a liability of $3.0 million as of March 31, 2019, compared to a liability of $7.6 million as of December 31, 2018. These deferred power cost balances represent amounts due to customers.

Decoupling and Earnings Sharing Mechanisms

Decoupling (also known as a FCA in Idaho) is a mechanism designed to sever the link between a utility's revenues and consumers' energy usage. In each of our jurisdictions, Avista Utilities' electric and natural gas revenues are adjusted so as to be based on the number of customers in certain customer rate classes and assumed "normal" kilowatt hour and therm sales, rather than being based on actual kilowatt hour and therm sales. The difference between revenues based on the number of customers and "normal" sales and revenues based on actual usage is deferred and either surcharged or rebated to customers beginning in the following year. Only residential and certain commercial customer classes are included in our decoupling mechanisms. See the 2018 Form 10-K for a discussion of the mechanisms in each jurisdiction.

Total net cumulative decoupling deferrals among all jurisdictions were regulatory assets of $9.5 million as of March 31, 2019 and $13.9 million as of December 31, 2018. These decoupling assets represent amounts due from customers. Total net earnings sharing balances among all jurisdictions were regulatory liabilities of $0.9 million as of March 31, 2019 and $1.5 million as of December 31, 2018. These earnings sharing liabilities represent amounts due to customers.

See "Results of Operations - Avista Utilities" for further discussion of the amounts recorded to operating revenues in 2019 and 2018 related to the decoupling and earnings sharing mechanisms.

Results of Operations - Overall

The following provides an overview of changes in our Condensed Consolidated Statements of Income. More detailed explanations are provided, particularly for operating revenues and operating expenses, in the business segment discussions (Avista Utilities, AEL&P, and the other businesses) that follow this section.

The balances included below for utility operations reconcile to the Condensed Consolidated Statements of Income.

Three months ended March 31, 2019 compared to the three months ended March 31, 2018

The following graph shows the total change in net income attributable to Avista Corp. shareholders for the first quarter of 2018 to the first quarter of 2019, as well as the various factors that caused such change (dollars in millions):

Utility revenues decreased at both Avista Utilities and AEL&P. Avista Utilities' revenues decreased primarily due to a decrease in wholesale electric revenues (primarily from a decrease in volumes). This was partially offset by an increase in revenue from wholesale natural gas revenues (primarily from an increase in sales prices), general rate increases and customer growth. AEL&P's revenues decreased due to a decrease in retail rates associated with the federal income tax law change, as well as a decrease in sales volumes due to weather that was warmer than the prior year.

Utility resource costs decreased at both Avista Utilities and AEL&P. While resource costs in isolation decreased at Avista Utilities, when considered with our wholesale electric sales, our net power supply costs (resource costs less wholesale revenues) increased as compared to 2018. This was due to lower hydroelectric generation as well as higher purchased power prices and natural gas fuel prices. The decrease at AEL&P was due to a decrease in deferred power supply expenses, as well as the

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adoption of the new lease standard on January 1, 2019, which resulted in the reclassification of Snettisham power purchase costs from resource costs to depreciation and amortization and interest expense in 2019. See "Notes 2 and 5 of the Notes to Condensed Consolidated Financial Statements" for further information regarding the adoption of the new lease standard.

The increase in utility other operating expenses was due to an increase at Avista Utilities and a slight increase at AEL&P. The increase at Avista Utilities was the result of an increase in generation and distribution operating and maintenance costs and employee incentive and benefit costs.

The merger transaction costs are related to the now terminated Hydro One acquisition. These costs increased for the first quarter of 2019 because 2019 includes financial advisers' fees, legal fees, consulting fees and employee time, whereas the first quarter of 2018 consisted primarily of employee time incurred directly related to the transaction. None of the acquisition costs are being passed through to customers.

Utility depreciation and amortization increased due to additions to utility plant.

The merger termination fee was received from Hydro One due to the mutual agreement to terminate the proposed acquisition. See "Note 17 of the Notes to Condensed Consolidated Financial Statements" for additional discussion.

Income taxes increased due to income taxes associated with the merger termination fee. Our effective tax rate was 20.6 percent for the first quarter of 2019 compared to 16.3 percent for the first quarter of 2018. We expect our full year 2019 effective tax rate to be approximately 16 percent to 17 percent. See "Note 8 of the Notes to Condensed Consolidated Financial Statements" for further details and a reconciliation of our effective tax rate.

The increase in other was primarily because 2018 included an impairment of an investment and additional charges associated with a renovation, whereas the first quarter of 2019 included earnings from our investments.

Non-GAAP Financial Measures

The following discussion for Avista Utilities includes two financial measures that are considered “non-GAAP financial measures”: electric utility margin and natural gas utility margin. In the AEL&P section, we include a discussion of utility margin, which is also a non-GAAP financial measure.

Generally, a non-GAAP financial measure is a numerical measure of a company's financial performance, financial position or cash flows that excludes (or includes) amounts that are included (excluded) in the most directly comparable measure calculated and presented in accordance with GAAP. Electric utility margin is electric operating revenues less electric resource costs, while natural gas utility margin is natural gas operating revenues less natural gas resource costs. The most directly comparable GAAP financial measure to electric and natural gas utility margin is utility operating revenues as presented in "Note 16 of the Notes to Condensed Consolidated Financial Statements."

The presentation of electric utility margin and natural gas utility margin is intended to enhance the understanding of operating performance. We use these measures internally and believe they provide useful information to investors in their analysis of how changes in loads (due to weather, economic or other conditions), rates, supply costs and other factors impact our results of operations. Changes in loads, as well as power and natural gas supply costs, are generally deferred and recovered from customers through regulatory accounting mechanisms. Accordingly, the analysis of utility margin generally excludes most of the change in revenue resulting from these regulatory mechanisms. We present electric and natural gas utility margin separately below for Avista Utilities since each business has different cost sources, cost recovery mechanisms and jurisdictions, so we believe that separate analysis is beneficial. These measures are not intended to replace utility operating revenues as determined in accordance with GAAP as an indicator of operating performance. Reconciliations of operating revenues to utility margin are set forth below.

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Results of Operations - Avista Utilities

Three months ended March 31, 2019 compared to the three months ended March 31, 2018

Utility Operating Revenues

The following graphs present Avista Utilities' electric operating revenues and megawatt-hour (MWh) sales for the three months ended March 31 (dollars in millions and MWhs in thousands):

(1) This balance includes public street and highway lighting, which is considered part of retail electric revenues, and deferrals/amortizations to customers related to federal income tax law changes.

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The following table presents the current year deferrals and the amortization of prior year decoupling balances that are reflected in utility electric operating revenues for the three months ended March 31 (dollars in thousands):

	Electric Operating Revenues
	2019			2018
Current year decoupling deferrals (a)	$	(2,681	)	$	4,012
Amortization of prior year decoupling deferrals (b)	1,076			(4,880		)
Total electric decoupling revenue	$	(1,605	)	$	(868	)

(a) Positive amounts are increases in decoupling revenue in the current year and will be surcharged to customers in future years. Negative numbers are decreases in decoupling revenue in the current year and will be rebated to customers in future years.

(b) Positive amounts are increases in decoupling revenue in the current year and are related to the amortization of rebate balances that resulted in prior years and are being refunded to customers (causing a corresponding decrease in retail revenue from customers) in the current year. Negative numbers are decreases in decoupling revenue in the current year and are related to the amortization of surcharge balances that resulted in prior years and are being surcharged to customers (causing a corresponding increase in retail revenue from customers) in the current year.

Total electric revenues decreased $6.0 million for the first quarter of 2019 as compared to the first quarter of 2018 primarily due to the following:

• a $1.1 million increase in retail electric revenue due to an increase in total MWhs sold (increased revenues $8.1 million), partially offset by a decrease in revenue per MWh (decreased revenues $7.0 million).

◦ The increase in total retail MWhs sold was the result of weather that was cooler than the prior year (which increased electric heating loads) and customer growth. Compared to the first quarter of 2018, residential electric use per customer increased 5 percent and commercial use per customer increased 1 percent. Heating degree days in Spokane were 14 percent above normal and 17 percent above the first quarter of 2018.

◦ The decrease in revenue per MWh was primarily due to a decrease in decoupling rates (as our decoupling surcharges were larger in prior years, which resulted in higher surcharge rates in 2018 as compared to 2019) and decreases associated with the lower corporate tax rate. This was partially offset by general rate increases in Washington (effective May 1, 2018) and Idaho (effective January 1, 2019).

• a $19.2 million decrease in wholesale electric revenues due to a decrease in sales volumes (decreased revenues $15.1 million) and a decrease in sales prices (decreased revenues $4.1 million). The fluctuation in volumes and prices was primarily the result of our optimization activities.

• a $1.2 million decrease in sales of fuel due to a decrease in sales of natural gas fuel as part of thermal generation resource optimization activities.

• a $0.7 million decrease in electric decoupling revenue. Weather was cooler than normal in the first quarter of 2019, which resulted in decoupling deferral rebates related to the current year. This was partially offset by the amortization of decoupling rebates from prior years.

• the $14.1 million increase in other electric revenues was primarily related to federal income tax law changes that lowered the corporate tax rate from 35 percent to 21 percent. As our customers' rates had the 35 percent corporate tax rate built in from prior general rate cases, we deferred the impact of the change in the first quarter of 2018. Effective May 1, 2018 in Washington and June 1, 2018 in Idaho, base rates reflect the lower 21 percent corporate tax.

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The following graphs present Avista Utilities' natural gas operating revenues and therms delivered for the three months ended March 31 (dollars in millions and therms in thousands):

(1) This balance includes interruptible and industrial revenues, which are considered part of retail natural gas revenues, and deferrals/amortizations to customers related to federal income tax law changes.

The following table presents the current year deferrals and the amortization of prior year decoupling balances that are reflected in utility natural gas operating revenues for the three months ended March 31 (dollars in thousands):

	Natural Gas Operating Revenues
	2019			2018
Current year decoupling deferrals (a)	$	(6,106	)	$	149
Amortization of prior year decoupling deferrals (b)	3,053			(5,220		)
Total natural gas decoupling revenue	$	(3,053	)	$	(5,071	)

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(a) Positive amounts are increases in decoupling revenue in the current year and will be surcharged to customers in future years. Negative numbers are decreases in decoupling revenue in the current year and will be rebated to customers in future years.

(b) Positive amounts are increases in decoupling revenue in the current year and are related to the amortization of rebate balances that resulted in prior years and are being refunded to customers (causing a corresponding decrease in retail revenue from customers) in the current year. Negative numbers are decreases in decoupling revenue in the current year and are related to the amortization of surcharge balances that resulted in prior years and are being surcharged to customers (causing a corresponding increase in retail revenue from customers) in the current year.

Total natural gas revenues increased $21.2 million for the first quarter of 2019 as compared to the first quarter of 2018 primarily due to the following:

• a $4.2 million decrease in natural gas retail revenues due to lower retail rates (decreased revenues $20.0 million), partially offset by an increase in volumes (increased revenues $15.8 million).

◦ We sold more retail natural gas in the first quarter of 2019 as compared to the first quarter of 2018 primarily due to colder weather and partially due to customer growth. Compared to first quarter of 2018, residential use per customer increased 13 percent and commercial use per customer increased 16 percent. Heating degree days in Spokane were 14 percent above normal, and 17 percent above the first quarter of 2018. Heating degree days in Medford were 10 percent above normal, and 7 percent above the first quarter of 2018.

◦ Lower retail rates were due to PGAs and rate decreases associated with the lower corporate tax rate and decoupling rate decreases (as our decoupling surcharges were larger in prior years, which resulted in higher surcharge rates in 2018 as compared to 2019), partially offset by general rate increases in Washington (effective May 1, 2018) and Idaho (effective January 1, 2019).

• a $16.1 million increase in wholesale natural gas revenues due to an increase in prices (increased revenues $13.1 million) and an increase in volumes (increased revenues $3.0 million). Differences between revenues and costs from sales of resources in excess of retail load requirements and from resource optimization are accounted for through the PGA mechanisms.

• a $2.0 million increase in natural gas decoupling revenue. Weather was cooler than normal in the first quarter of 2019, which resulted in decoupling deferral rebates related to the current year. This was partially offset by the amortization of decoupling rebates from prior years.

• the $7.4 million increase in other natural gas revenues was primarily related to federal income tax law changes that lowered the corporate tax rate from 35 percent to 21 percent. As our customers' rates had the 35 percent corporate tax rate built in from prior general rate cases, we deferred the impact of the change in the first quarter of 2018. Effective May 1, 2018 in Washington, June 1, 2018 in Idaho and March 1, 2019 in Oregon, base rates reflect the lower 21 percent corporate tax.

The following table presents Avista Utilities' average number of electric and natural gas retail customers for the three months ended March 31:

	Electric Customers		Natural Gas Customers
	2019	2018	2019	2018
Residential	343,938	339,218	319,483	313,247
Commercial	42,874	42,624	35,707	35,506
Interruptible	—	—	42	38
Industrial	1,314	1,321	239	248
Public street and highway lighting	601	588	—	—
Total retail customers	388,727	383,751	355,471	349,039

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Utility Resource Costs

The following graphs present Avista Utilities' resource costs for the three months ended March 31 (dollars in millions):

Total electric resource costs in the graph above include intracompany resource costs of $23.7 million and $10.3 million for the three months ended March 31, 2019 and March 31, 2018, respectively.

Total natural gas resource costs in the graph above include intracompany resource costs of $19.7 million and $6.9 million for the three months ended March 31, 2019 and March 31, 2018, respectively.

Total electric resource costs decreased $5.0 million for the first quarter of 2019 as compared to the first quarter of 2018 primarily due to the following:

• a $6.1 million decrease in purchased power costs due to a decrease in the volume of power purchases (decreased costs $10.5 million), partially offset by an increase in wholesale prices (increased costs $4.4 million). The fluctuation in volumes and prices was primarily the result of our optimization activities during the quarter.

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• a $7.9 million increase in fuel for generation primarily due to an increase in thermal generation, as well as an increase in natural gas fuel prices.

• a $0.8 million increase in other fuel costs. This represents fuel and the related derivative instruments that were purchased for generation but were later sold when conditions indicated that it was more economical to sell the fuel as part of the resource optimization process. When the fuel or related derivative instruments are sold, that revenue is included in sales of fuel.

• an $11.0 million decrease from net amortizations and deferrals of power costs.

• a $3.4 million net increase from other regulatory amortizations and other electric resource costs.

Total natural gas resource costs increased $18.3 million for the first quarter of 2019 as compared to the first quarter of 2018 primarily due to the following:

• a $52.2 million increase in natural gas purchased due to an increase in the price of natural gas (increased costs $39.3 million) and an increase in total therms purchased (increased costs $12.9 million).

• a $35.7 million decrease from net amortizations and deferrals of natural gas costs, primarily reflecting higher natural gas prices.

• a $1.8 million increase from other regulatory amortizations.

Utility Margin

The following table reconciles Avista Utilities' operating revenues, as presented in "Note 16 of the Notes to Condensed Consolidated Financial Statements" to the Non-GAAP financial measure utility margin for the three months ended March 31 (dollars in thousands):

	Electric				Natural Gas				Intracompany						Total
	2019		2018		2019		2018		2019			2018			2019		2018
Operating revenues	$	256,467	$	262,477	$	164,677	$	143,448	$	(43,442	)	$	(17,171	)	$	377,702	$	388,754
Resource costs	93,881		98,890		88,273		69,946		(43,442		)	(17,171		)	138,712		151,665
Utility margin	$	162,586	$	163,587	$	76,404	$	73,502	$	—		$	—		$	238,990	$	237,089

Electric utility margin decreased $1.0 million and natural gas utility margin increased $2.9 million.

Electric utility margin decreased primarily due to an increase in net power supply costs. The increase in net power supply costs was due to lower hydroelectric generation, as well as higher purchased power prices and natural gas fuel prices. For the first quarter of 2019, we had a $2.5 million pre-tax expense under the ERM in Washington, compared to a $4.9 million pre-tax benefit for the first quarter of 2018. For the full year of 2019, we expect to be in a benefit position under the ERM within the 75 percent customer/25 percent Company sharing band.

Partially offsetting the impact of higher net power supply costs, electric utility margin was positively impacted by general rate increases in Washington (effective May 1, 2018) and Idaho (effective January 1, 2019), and customer growth.

Natural gas utility margin increased primarily due to general rate increases in Washington (effective May 1, 2018) and Idaho (effective January 1, 2019), and customer growth.

Intracompany revenues and resource costs represent purchases and sales of natural gas between our natural gas distribution operations and our electric generation operations (as fuel for our generation plants). These transactions are eliminated in the presentation of total results for Avista Utilities and in the condensed consolidated financial statements but are included in the separate results for electric and natural gas presented above.

Results of Operations - Alaska Electric Light and Power Company

Three months ended March 31, 2019 compared to the three months ended March 31, 2018

Net income for AEL&P was $3.6 million for the three months ended March 31, 2019 compared to $3.8 million for the three months ended March 31, 2018.

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The following table presents AEL&P's operating revenues, resource costs and resulting utility margin for the three months ended March 31 (dollars in thousands):

	Three months ended March 31,
	2019			2018
Operating revenues	$	10,881		$	13,663
Resource costs	(1,365		)	2,953
Utility margin	$	12,246		$	10,710

Electric revenues decreased for the first quarter of 2019 primarily due to lower sales volumes to residential and commercial customers for 2019 as compared to 2018. This resulted from weather that was warmer than the prior year.

Resource costs decreased from the prior year due to the adoption of the new lease standard on January 1, 2019, which resulted in the reclassification of Snettisham power purchase costs from resource costs to depreciation and amortization and interest expense in 2019. See "Notes 2 and 5 of the Notes to Condensed Consolidated Financial Statements" for further information regarding the adoption of the new lease standard. In addition, AEL&P had low hydroelectric generation during the first quarter of 2019, which prevented AEL&P from providing energy to their interruptible customers. A portion of the sales to interruptible customers is used to reduce the overall cost of power to AEL&P's firm customers. When interruptible sales are below a certain threshold, AEL&P recognizes a regulatory asset and records a reduction to deferred power supply costs (resource costs) to reflect a future billable amount to its firm customers when the cost of power rates are reset.

For operating expenses, there was a slight increase in other operating expenses for the first quarter of 2019 primarily due to an increase in distribution maintenance costs.

Results of Operations - Other Businesses

Net income for our other businesses was $0.3 million for the three months ended March 31, 2019 compared to a net loss of $4.4 million for the three months ended March 31, 2018.

During the first quarter of 2019, we had net investment gains associated with our equity investments. This is compared to investments losses in the first quarter of 2018 primarily from an impairment of one of our investments. In addition, during the first quarter of 2018 we had expenses associated with a renovation project.

Critical Accounting Policies and Estimates

The preparation of our consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the consolidated financial statements. Changes in these estimates and assumptions are considered reasonably possible and may have a material effect on our consolidated financial statements and thus actual results could differ from the amounts reported and disclosed herein. Our critical accounting policies that require the use of estimates and assumptions were discussed in detail in the 2018 Form 10-K and have not changed materially from that discussion.

Liquidity and Capital Resources

Overall Liquidity

Our sources of overall liquidity and the requirements for liquidity have not materially changed in the three months ended March 31, 2019. See the 2018 Form 10-K for further discussion.

As of March 31, 2019, we had $220.9 million of available liquidity under the Avista Corp. committed line of credit and $25.0 million under the AEL&P committed line of credit. With our $400.0 million credit facility that expires in April 2021 and AEL&P's $25.0 million credit facility that expires in November 2019, we believe that we have adequate liquidity to meet our needs for the next 12 months. We anticipate pursuing an extension to the AEL&P credit facility or entering into a new agreement during 2019.

Review of Cash Flow Statement

Operating Activities

Net cash provided by operating activities was $196.9 million for the three months endedMarch 31, 2019 compared to $184.8 million for the three months ended March 31, 2018. The increase in net cash provided by operating activities was primarily due to the receipt of the $103.0 million merger termination fee from Hydro One that is reflected in net income for 2019. The termination fee was used for reimbursing our transaction costs incurred from 2017 to 2019 which totaled approximately $51.0 million, including income taxes. The balance of the termination fee was used for general corporate purposes and reduced our

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need for external financing. Our total transaction costs were $19.7 million (pre-tax) for 2019 and we also incurred approximately $15.7 million in taxes in 2019 (net of $1.8 million in tax benefits recaptured from 2017 and 2018).

The above increase was partially offset by power and natural gas deferrals which increased during 2019 due to higher natural gas prices during the quarter (which decreased cash flows by $48.1 million) as compared to an increase to operating cash flows of $0.1 million in the first quarter of 2018.

Also, changes in our cash collateral decreased operating cash flows when compared to 2018 because during 2018, our cash collateral posted decreased by $18.4 million, whereas in 2019 it only decreased by $3.4 million. The collateral decreased in both periods primarily due to fluctuations in the fair value of energy commodity derivatives which required less collateral. In addition, outstanding interest rate swaps in 2018 required less collateral.

Finally, changes in accounts receivable decreased operating cash flows by $9.8 million during 2019, but increased operating cash flows by $16.0 million in 2018.

Investing Activities

Net cash used in investing activities was $97.7 million for the three months endedMarch 31, 2019, compared to $87.4 million for the three months ended March 31, 2018. During the three months endedMarch 31, 2019, we paid $93.6 million for utility capital expenditures compared to $81.8 million for the three months ended March 31, 2018. Also, during the first quarter of 2019, our subsidiaries invested $3.5 million in equity and property, compared to $3.7 million invested during the first quarter of 2018.

Financing Activities

Net cash used by financing activities was $98.0 million for the three months endedMarch 31, 2019, compared to $87.3 million for the three months ended March 31, 2018. Due to the receipt of the termination fee described above, we were able to reduce our short-term borrowings during the first quarter of 2019, as evidenced by the $71.0 million decrease in short-term borrowings during the quarter.

Capital Resources

Our consolidated capital structure, including the current portion of long-term debt and short-term borrowings, and excluding noncontrolling interests, consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Amount		Percent of total		Amount		Percent of total
Current portion of long-term debt and capital leases	$	104,989	2.7	%	$	107,645	2.8	%
Short-term borrowings	119,000		3.1	%	190,000		4.9	%
Long-term debt to affiliated trusts	51,547		1.3	%	51,547		1.3	%
Long-term debt and capital leases	1,701,207		44.3	%	1,755,529		45.3	%
Total debt	1,976,743		51.4	%	2,104,721		54.3	%
Total Avista Corporation shareholders’ equity	1,867,310		48.6	%	1,773,220		45.7	%
Total	$	3,844,053	100.0	%	$	3,877,941	100.0	%

Our shareholders’ equity increased $94.1 million during the first three months of 2019 primarily due to net income, partially offset by dividends.

We need to finance capital expenditures and acquire additional funds for operations from time to time. The cash requirements needed to service our indebtedness, both short-term and long-term, reduce the amount of cash flow available to fund capital expenditures, purchased power, fuel and natural gas costs, dividends and other requirements.

Committed Lines of Credit

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million that expires in April 2021. As of March 31, 2019, there was $220.9 million of available liquidity under this line of credit.

The Avista Corp. credit facility contains customary covenants and default provisions, including a covenant which does not permit our ratio of “consolidated total debt” to “consolidated total capitalization” to be greater than 65 percent at any time. As of March 31, 2019, we were in compliance with this covenant with a ratio of 51.4 percent.

AEL&P has a $25.0 million committed line of credit that expires in November 2019. As of March 31, 2019, there were no borrowings or letters of credit outstanding under this committed line of credit.

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The AEL&P credit facility contains customary covenants and default provisions including a covenant which does not permit the ratio of “consolidated total debt at AEL&P” to “consolidated total capitalization at AEL&P,” (including the impact of the Snettisham obligation) to be greater than 67.5 percent at any time. As of March 31, 2019, AEL&P was in compliance with this covenant with a ratio of 52.8 percent.

Balances outstanding and interest rates of borrowings under Avista Corp.'s committed line of credit were as follows as of and for the three months ended March 31 (dollars in thousands):

	2019			2018
Borrowings outstanding at end of period	$	119,000		$	50,000
Letters of credit outstanding at end of period	$	60,103		$	35,420
Maximum borrowings outstanding during the period	$	190,000		$	111,000
Average borrowings outstanding during the period	$	113,404		$	76,211
Average interest rate on borrowings during the period	3.30		%	2.30		%
Average interest rate on borrowings at end of period	3.31		%	2.56		%

The increase in the average interest rates as of and for the three months ended March 31, 2019 was primarily the result of a downgrade in our credit rating by Moody's during December 2018. See the 2018 10-K for further discussion of the downgrade by Moody's.

As of March 31, 2019, Avista Corp. and its subsidiaries were in compliance with all of the covenants of their financing agreements, and none of Avista Corp.'s subsidiaries constituted a “significant subsidiary” as defined in Avista Corp.'s committed line of credit.

Liquidity Expectations

In January 2019, we received a $103 million termination fee from Hydro One in connection with the termination of the proposed acquisition. The termination fee was used for reimbursing our transaction costs incurred from 2017 to 2019. These costs, including income taxes, total approximately $51 million. The balance of the termination fee was used for general corporate purposes and reduced our need for external financing.

During 2019, we expect to issue approximately $165.0 million of long-term debt and up to $50.0 million of equity in order to refinance maturing long-term debt, fund planned capital expenditures and maintain an appropriate capital structure.

After considering the expected issuances of long-term debt and equity during 2019, we expect net cash flows from operating activities, together with cash available under our committed line of credit agreements, to provide adequate resources to fund capital expenditures, dividends, and other contractual commitments.

Capital Expenditures

We are making capital investments to enhance service and system reliability for our customers and replace aging infrastructure. Our estimates for 2019 through 2021 have not materially changed during the three months ended March 31, 2019. See the 2018 Form 10-K for further information.

Off-Balance Sheet Arrangements

As of March 31, 2019, we had $60.1 million in letters of credit outstanding under our $400.0 million committed line of credit, compared to $10.5 million as of December 31, 2018. The increase in letters of credit outstanding was due to additional letters of credit being issued as collateral for energy commodity derivative instruments.

Pension Plan

Avista Utilities

In the three months endedMarch 31, 2019 we contributed $7.3 million to the pension plan and we expect to contribute a total of $22.0 million in 2019. We expect to contribute a total of $110.0 million to the pension plan in the period 2019 through 2023, with annual contributions of $22.0 million over that period.

The final determination of pension plan contributions for future periods is subject to multiple variables, most of which are beyond our control, including changes to the fair value of pension plan assets, changes in actuarial assumptions (in particular the discount rate used in determining the benefit obligation), or changes in federal legislation. We may change our pension plan contributions in the future depending on changes to any variables, including those listed above.

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See "Note 7 of the Notes to Condensed Consolidated Financial Statements" for additional information regarding the pension plan.

Contractual Obligations

Our future contractual obligations have not materially changed during the three months ended March 31, 2019. See the 2018 Form 10-K for our contractual obligations.

Environmental Issues and Contingencies

Our environmental issues and contingencies disclosures have not materially changed during the three months ended March 31, 2019 except for the following:

Colstrip Coal Contract

Colstrip, which is operated by Talen Montana, is supplied with fuel from adjacent coal reserves under coal supply and transportation agreements. The current contract for coal supply extends through 2019; however, the coal mine operator is in bankruptcy and had indicated that it would reject the current contract in its bankruptcy. The co-owners of Colstrip filed objections to the proposed rejection of the coal supply contract and in February 2019, an amended plan of reorganization was filed in which the proposal to reject the coal supply contract was withdrawn. The court approved the amended plan of reorganization on March 2, 2019, which allows the coal supply contract to remain in effect through 2019. The co-owners of Colstrip are in negotiations for an extension to the coal contract beyond 2019 and at the same time exploring alternative sources for coal supply. Any new arrangements for coal beyond 2019 may have higher costs than the existing coal supply agreement.

Clean Energy Commitment

On April 18, 2019, we announced a goal to serve our customers with 100 percent clean electricity by 2045 and to have a carbon-neutral supply of electricity by the end of 2027. To help achieve these goals and add to our clean electricity portfolio, in the last three years, we have implemented three renewable energy projects on behalf of our customers, the Community Solar project in Spokane Valley, Washington (owned by Avista Corp.), the Solar Select project in Lind, Washington (PPA) and the Rattlesnake Flat Wind project in Adams County, Washington (PPA).

Climate Change - State Legislation and State Regulatory Activities

The states of Washington and Oregon have adopted non-binding targets to reduce GHG emissions. Both states enacted their targets with an expectation of reaching the targets through a combination of renewable energy standards, and assorted “complementary policies,” but no specific reductions are mandated. The Governors and Legislatures of both states began drafting climate-related proposals in late 2018, ahead of the 2019 legislative sessions.In Washington State, after a range of proposals were made, Senate Bill 5116 (SB 5116) became the vehicle for promoting the Governor’s requested action toward a “clean energy economy” in general and renewable or non-emitting electricity system specifically. SB 5116 would require Washington utilities to eliminate the allocation of coal-fired resources to Washington retail customers by the end of 2025 and to achieve carbon neutrality by 2030 while meeting a minimum 80 percent of load through delivery of renewable or non-emitting resources. The bill would require utilities to meet 100 percent of load with renewable and non-emitting resources by 2045. Under SB 5116, hydroelectric generation is considered a renewable resource. The bill was passed by both the Senate and House in April 2019 and is awaiting final approval from the Governor. While we are unable to predict any outcome of these efforts, we are engaged with key parties in these policy deliberations. We do believe it likely that the proposed clean energy legislation will become law in 2019. We intend to seek recovery of any costs associated with the clean energy legislation through the regulatory process.

See the 2018 Form 10-K for further discussion of environmental issues and contingencies.

Enterprise Risk Management

The material risks to our businesses were discussed in our 2018 Form 10-K and have not materially changed during the three months ended March 31, 2019. Refer to the 2018 Form 10-K for further discussion of our risks and the mitigation of those risks.

Financial Risk

Our financial risks have not materially changed during the three months ended March 31, 2019. Refer to the 2018 Form 10-K. The financial risks included below are required interim disclosures, even if they have not materially changed from December 31, 2018.

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Interest Rate Risk

We use a variety of techniques to manage our interest rate risks. We have an interest rate risk policy and have established a policy to limit our variable rate exposures to a percentage of total capitalization. Additionally, interest rate risk is managed by monitoring market conditions when timing the issuance of long-term debt and optional debt redemptions and establishing fixed rate long-term debt with varying maturities. See "Note 6 of the Notes to Condensed Consolidated Financial Statements" for a summary of our interest rate swap derivatives outstanding as of March 31, 2019 and December 31, 2018 and the amount of additional collateral we would have to post in certain circumstances.

Credit Risk

Avista Utilities' contracts for the purchase and sale of energy commodities can require collateral in the form of cash or letters of credit. As of March 31, 2019, we had cash deposited as collateral in the amount of $72.3 million and letters of credit of $56.1 million outstanding related to our energy derivative contracts. Price movements and/or a downgrade in our credit ratings could impact further the amount of collateral required. See “Credit Ratings” in the 2018 Form 10-K for further information. For example, in addition to limiting our ability to conduct transactions, if our credit ratings were lowered to below “investment grade” based on our positions outstanding at March 31, 2019 (including contracts that are considered derivatives and those that are considered non-derivatives), we would potentially be required to post the following additional collateral (in thousands):

	March 31, 2019
Additional collateral taking into account contractual thresholds	$	6,900
Additional collateral without contractual thresholds	8,500

Under the terms of interest rate swap derivatives that we enter into periodically, we may be required to post cash or letters of credit as collateral depending on fluctuations in the fair value of the instrument. As of March 31, 2019, we had interest rate swap derivatives outstanding with a notional amount totaling $245.0 million and we had deposited cash in the amount of $2.9 million as collateral for these interest rate swap derivatives. If our credit ratings were lowered to below “investment grade” based on our interest rate swap derivatives outstanding at March 31, 2019, we would be required to post up to $2.3 million of additional collateral (with or without contractual thresholds).

Energy Commodity Risk

Our energy commodity risks have not materially changed during the three months ended March 31, 2019, except as discussed below. Refer to the 2018 Form 10-K. The following table presents energy commodity derivative fair values as a net asset or (liability) as of March 31, 2019 that are expected to settle in each respective year (dollars in thousands):

	Purchases											Sales
	Electric Derivatives					Gas Derivatives						Electric Derivatives						Gas Derivatives
Year	Physical (1)			Financial (1)		Physical (1)			Financial (1)			Physical (1)			Financial (1)			Physical (1)			Financial (1)
Remainder 2019	$	(607	)	$	7,354	$	(1,124	)	$	(7,539	)	$	144		$	(20,818	)	$	(494	)	$	254
2020	—			—		(740		)	(577		)	(680		)	(8,893		)	(1,119		)	(2,769		)
2021	—			—		—			(549		)	—			(1,065		)	(483		)	(315		)
2022	—			—		—			—			—			—			—			—
2023	—			—		—			—			—			—			—			—
Thereafter	—			—		—			—			—			—			—			—

The following table presents energy commodity derivative fair values as a net asset or (liability) as of December 31, 2018 that are expected to be delivered in each respective year (dollars in thousands):

	Purchases											Sales
	Electric Derivatives					Gas Derivatives						Electric Derivatives						Gas Derivatives
Year	Physical (1)			Financial (1)		Physical (1)			Financial (1)			Physical (1)			Financial (1)			Physical (1)			Financial (1)
2019	$	(2,238	)	$	7,289	$	(991	)	$	(32,285	)	$	34		$	(19,047	)	$	(443	)	$	6,252
2020	—			—		(1,266		)	(7,797		)	(28		)	(4,044		)	(1,517		)	(240		)
2021	—			—		—			(1,393		)	—			—			(629		)	47
2022	—			—		—			—			—			—						—
2023	—			—		—			—			—			—			—			—
Thereafter	—			—		—			—			—			—			—			—

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(1) Physical transactions represent commodity transactions where we will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

The above electric and natural gas derivative contracts will be included in either power supply costs or natural gas supply costs during the period they are delivered and will be included in the various deferral and recovery mechanisms (ERM, PCA, and PGAs), or in the general rate case process, and are expected to eventually be collected through retail rates from customers.

Regional Energy Markets

The California Independent System Operator (CAISO) operates an Energy Imbalance Market (EIM) in the western United States. Most investor-owned utilities in the Pacific Northwest are either participants in the CAISO EIM or plan to integrate into the market in the near future. Factors to be considered in deciding whether to join the CAISO EIM include the amount of variable generating resources in the utilities’ systems, the ability to manage the variable generating resources within the utilities’ systems, the costs associated with joining the CAISO EIM, and the economic benefits associated with joining the CAISO EIM. As additional utilities join the CAISO EIM, there is a reduction in bilateral market liquidity and opportunities for wholesale transactions close to the operating hour. Based on these considerations, we signed an agreement in April 2019 to join the CAISO EIM. We expect to begin implementing new processes to enable participation in the EIM in the second half of 2019 and we expect to be full participants by April 2022. We estimate the total cost of joining the EIM to be approximately $25 million for both capital and operating expense spending over the three-year implementation period and we estimate annual benefits of approximately $6 million from market participation. We expect to seek recovery of the net costs through the regulatory process.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

The information required by this item is set forth in the Enterprise Risk Management section of "Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations" and is incorporated herein by reference.

Item 4. Controls and Procedures

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

The Company has disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended) (Act) that are designed to ensure that information required to be disclosed in the reports it files or submits under the Act is recorded, processed, summarized and reported on a timely basis. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the Act is accumulated and communicated to the Company’s management, including its principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure. With the participation of the Company’s principal executive officer and principal financial officer, the Company's management evaluated its disclosure controls and procedures as of the end of the period covered by this report. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. Based upon this evaluation, the Company’s principal executive officer and principal financial officer have concluded that the Company’s disclosure controls and procedures are effective at a reasonable assurance level as of March 31, 2019.

There have been no changes in the Company's internal control over financial reporting that occurred during the first quarter of 2019 that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

PART II. Other Information

Item 1. Legal Proceedings

See “Note 15 of Notes to Condensed Consolidated Financial Statements” in “Part I. Financial Information Item 1. Condensed Consolidated Financial Statements.”

Item 1A. Risk Factors

Refer to the 2018 Form 10-K for disclosure of risk factors that could have a significant impact on our results of operations, financial condition or cash flows and could cause actual results or outcomes to differ materially from those discussed in our reports filed with the SEC (including this Quarterly Report on Form 10-Q), and elsewhere. These risk factors have not materially changed from the disclosures provided in the 2018 Form 10-K.

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In addition to these risk factors, see also “Forward-Looking Statements” for additional factors which could have a significant impact on our operations, results of operations, financial condition or cash flows and could cause actual results to differ materially from those anticipated in such statements.

Item 6. Exhibits

15		Letter Re: Unaudited Interim Financial Information (1)
31.1		Certification of Chief Executive Officer (Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002) (1)
31.2		Certification of Chief Financial Officer (Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002) (1)
32		Certification of Corporate Officers (Furnished Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002) (2)
101		The following financial information from the Quarterly Report on Form 10−Q for the period ended March 31, 2019, formatted in XBRL (Extensible Business Reporting Language) and filed electronically herewith: (i) the Condensed Consolidated Statements of Income; (ii) Condensed Consolidated Statements of Comprehensive Income; (iii) the Condensed Consolidated Balance Sheets; (iv) the Condensed Consolidated Statements of Cash Flows; (v) the Condensed Consolidated Statements of Equity; and (vi) the Notes to Condensed Consolidated Financial Statements. (1)
(1	)	Filed herewith.
(2	)	Furnished herewith.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		AVISTA CORPORATION
		(Registrant)
Date:	May 1, 2019	/s/    Mark T. Thies
		Mark T. Thies
		Senior Vice President, Chief Financial Officer, and Treasurer (Principal Financial Officer)

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EX-15

Exhibit 15

May 1, 2019

To the Board of Directors and Shareholders of Avista Corporation

1411 East Mission Ave

Spokane, Washington 99202

We have reviewed, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the unaudited interim financial information of Avista Corporation and subsidiaries for the periods ended March 31, 2019 and 2018, as indicated in our report dated April 30, 2019; because we did not perform an audit, we expressed no opinion on that information.

We are aware that our report referred to above, which is included in your Quarterly Report on Form 10-Q for the quarter ended March 31, 2019, is incorporated by reference in Registration Statement Nos. 333-33790, 333-126577, 333-179042 and 333-208986 on Form S-8.

We also are aware that the aforementioned report, pursuant to Rule 436(c) under the Securities Act of 1933, is not considered a part of the Registration Statements prepared or certified by an accountant or a report prepared or certified by an accountant within the meaning of Sections 7 and 11 of that Act.

/s/ Deloitte & Touche LLP

Seattle, Washington

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Scott L. Morris, certify that:

1. I have reviewed this report on Form 10-Q of Avista Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:	May 1, 2019	/s/    Scott L. Morris
		Scott L. Morris
		Chairman of the Board
		and Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Mark T. Thies, certify that:

1. I have reviewed this report on Form 10-Q of Avista Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	May 1, 2019	/s/    Mark T. Thies
		Mark T. Thies
		Senior Vice President,
		Chief Financial Officer, and Treasurer
		(Principal Financial Officer)

EX-32

Exhibit 32

AVISTA CORPORATION

__________________________________________________________________________________________

CERTIFICATION OF CORPORATE OFFICERS

(Furnished Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the

Sarbanes-Oxley Act of 2002)

__________________________________________________________________________________________

     Each of the undersigned, Scott L. Morris, Chairman of the Board and Chief Executive Officer of Avista Corporation (the “Company”), and Mark T. Thies, Senior Vice President, Chief Financial Officer and Treasurer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2019 fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934, as amended, and that the information contained therein fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 1, 2019

/s/    Scott L. Morris        

Scott L. Morris

Chairman of the Board

and Chief Executive Officer

/s/    Mark T. Thies        

Mark T. Thies

Senior Vice President,

Chief Financial Officer, and Treasurer

XML

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 29, 2019
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	ava
Entity Registrant Name	AVISTA CORP
Entity Central Index Key	0000104918
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		65,750,156

XML

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Utility revenues, exclusive of alternative revenue programs	$ 393,241	$ 408,356
Alternative revenue programs	(4,658)	(5,939)
Total utility revenues	388,583	402,417
Non-utility revenues	7,898	6,944
Total operating revenues	396,481	409,361
Utility operating expenses:
Resource costs	137,347	154,618
Other operating expenses	83,978	77,298
Merger transaction costs	19,664	672
Depreciation and amortization	48,914	44,733
Taxes other than income taxes	31,943	30,829
Other non-utility operating expenses:
Other operating expenses	7,355	6,824
Depreciation and amortization	209	181
Total operating expenses	329,410	315,155
Income from operations	67,071	94,206
Interest expense	25,651	24,776
Interest Expense, Other	357	253
Capitalized interest	(928)	(968)
Merger termination fee	(103,000)	0
Other income-net	(907)	4,479
Income before income taxes	145,898	65,666
Income tax expense	30,017	10,710
Net income	115,881	54,956
Net income attributable to noncontrolling interests	(87)	(66)
Net income attributable to Avista Corporation shareholders	$ 115,794	$ 54,890
Weighted-average common shares outstanding (thousands), basic	65,733	65,639
Weighted-average common shares outstanding (thousands), diluted	65,941	65,931
Earnings per common share attributable to Avista Corporation shareholders:
Basic	$ 1.76	$ 0.84
Diluted	$ 1.76	$ 0.83

XML

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 115,881	$ 54,956
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	160	204
Total other comprehensive loss	160	204
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	116,041	55,160
Net income attributable to noncontrolling interests	(87)	(66)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 115,954	$ 55,094

XML

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 43	$ 55

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 14,861	$ 14,656
Accounts and notes receivable-less allowances of $6,395 and $5,233, respectively	170,200	165,824
Materials and supplies, fuel stock and stored natural gas	61,354	63,881
Regulatory assets	41,566	48,552
Other current assets	60,948	54,010
Assets held for sale	15,874	0
Total current assets	364,803	346,923
Net utility property	4,626,054	4,648,930
Goodwill	52,426	57,672
Other regulatory assets	605,497	614,354
Other property and investments-net	241,203	114,697
Total assets	5,889,983	5,782,576
Current Liabilities:
Accounts payable	109,922	108,372
Current portion of long-term debt and capital leases	104,989	107,645
Short-term borrowings	119,000	190,000
Regulatory liabilities	55,464	113,209
Other current liabilities	175,454	120,358
Liabilities held for sale	1,813	0
Total current liabilities	566,642	639,584
Long-term debt and capital leases	1,701,207	1,755,529
Long-term debt to affiliated trusts	51,547	51,547
Pensions and other postretirement benefits	218,456	222,537
Deferred income taxes	501,928	487,602
Non-current regulatory liabilities	786,233	780,701
Other non-current liabilities and deferred credits	195,748	71,031
Total liabilities	4,021,761	4,008,531
Avista Corporation Stockholders’ Equity:
Common stock, no par value; 200,000,000 shares authorized; 65,668,477 and 65,494,333 shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively	1,140,242	1,136,491
Accumulated other comprehensive loss	(7,706)	(7,866)
Retained earnings	734,774	644,595
Total Avista Corporation shareholders’ equity	1,867,310	1,773,220
Noncontrolling Interests	912	825
Total equity	1,868,222	1,774,045
Total liabilities and equity	$ 5,889,983	$ 5,782,576

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts and notes receivable, allowances	$ 6,395	$ 5,233
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares outstanding	65,749,932	65,688,356

XML

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 115,881	$ 54,956
Non-cash items included in net income:
Depreciation and amortization	49,123	45,823
Provision for deferred income taxes	8,883	(5,049)
Power and natural gas cost amortizations (deferrals), net	(48,084)	72
Amortization of debt expense	669	815
Amortization of investment in exchange power	613	613
Stock-based compensation expense	4,845	1,963
Equity-related AFUDC	(1,485)	(1,392)
Pension and other postretirement benefit expense	9,084	8,170
Other regulatory assets and liabilities and deferred debits and credits	1,016	2,127
Change in decoupling regulatory deferral	4,471	5,703
Other	(1,943)	3,778
Contributions to defined benefit pension plan	(7,300)	(7,300)
Changes in certain current assets and liabilities:
Accounts and notes receivable	(9,787)	15,963
Materials and supplies, fuel stock and natural gas stored	(394)	8,815
Collateral posted for derivative instruments	3,432	18,382
Other current assets	1,705	(473)
Accounts payable	16,697	(21,997)
Income taxes payable	19,360	15,432
Other current liabilities	30,095	38,374
Net cash provided by operating activities	196,881	184,775
Investing Activities:
Utility property capital expenditures (excluding equity-related AFUDC)	(93,615)	(81,817)
Issuance of notes receivable at subsidiaries	(200)	(1,000)
Repayments of notes receivable at subsidiaries	261	0
Equity and property investments made by subsidiaries	(3,504)	(3,671)
Distributions received from investments	149	0
Other	(755)	(866)
Net cash used in investing activities	(97,664)	(87,354)
Financing Activities:
Net decrease in short-term borrowings	(71,000)	(55,398)
Maturity of long-term debt and capital leases	(665)	(3,037)
Issuance of common stock	190	232
Cash dividends paid	(25,615)	(24,634)
Other	(896)	(4,483)
Net cash used in financing activities	(97,986)	(87,320)
Cash And Cash Equivalents Period Increase (Decrease) Including Cash Held for Sale	1,231	10,101
Net increase in cash and cash equivalents for cash classified within assets held for sale	1,026	0
Net increase in cash and cash equivalents	205	10,101
Cash and cash equivalents at beginning of period	14,656	16,172
Cash and cash equivalents at end of period	$ 14,861	$ 26,273

XML

Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3725
Beginning Balance (in shares) at Dec. 31, 2017		65,494,333
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued		174,144
Ending Balance (in shares) at Mar. 31, 2018		65,668,477
Beginning Balance at Dec. 31, 2017		$ 1,133,448	$ (8,090)	$ 604,470
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Equity compensation expense		1,798
Issuance of common stock, net of issuance costs		232
Payment of minimum tax withholdings for share-based payment awards		(3,929)
Other comprehensive income	$ 204		204
Reclassification of excess income tax benefits			(1,742)	1,742
Net income attributable to Avista Corporation shareholders	54,890			54,890
Cash dividends paid (common stock)				(24,634)
Ending Balance at Mar. 31, 2018	1,758,571	$ 1,131,549	(9,628)	636,468
Beginning Balance Noncontrolling Interest at Dec. 31, 2017					$ 656
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Net income attributable to noncontrolling interests					66
Cash dividends paid to subsidiary noncontrolling interests					(540)
Ending Balance Noncontrolling Interest at Mar. 31, 2018					182
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Total Avista Corporation shareholders’ equity	1,758,389
Total Avista Corporation shareholders’ equity	$ 1,773,220
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3875
Beginning Balance (in shares) at Dec. 31, 2018	65,688,356	65,688,356
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Shares issued		61,576
Ending Balance (in shares) at Mar. 31, 2019	65,749,932	65,749,932
Beginning Balance at Dec. 31, 2018	$ 1,774,045	$ 1,136,491	(7,866)	644,595
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Equity compensation expense		4,452
Issuance of common stock, net of issuance costs		190
Payment of minimum tax withholdings for share-based payment awards		(891)
Other comprehensive income	160		160
Reclassification of excess income tax benefits			0	0
Net income attributable to Avista Corporation shareholders	115,794			115,794
Cash dividends paid (common stock)				(25,615)
Ending Balance at Mar. 31, 2019	1,868,222	$ 1,140,242	$ (7,706)	$ 734,774
Beginning Balance Noncontrolling Interest at Dec. 31, 2018	825				825
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Net income attributable to noncontrolling interests					87
Cash dividends paid to subsidiary noncontrolling interests					0
Ending Balance Noncontrolling Interest at Mar. 31, 2019	912				$ 912
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Total Avista Corporation shareholders’ equity	$ 1,867,310

XML

Summary Of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Business

Avista Corp. is primarily an electric and natural gas utility with certain other business ventures. Avista Utilities is an operating division of Avista Corp., comprising its regulated utility operations in the Pacific Northwest. Avista Utilities provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho. Avista Utilities also provides natural gas distribution service in parts of northeastern and southwestern Oregon. Avista Utilities has electric generating facilities in Washington, Idaho, Oregon and Montana. Avista Utilities also supplies electricity to a small number of customers in Montana, most of whom are employees who operate the Company's Noxon Rapids generating facility.

AERC is a wholly-owned subsidiary of Avista Corp. The primary subsidiary of AERC is AEL&P, which comprises Avista Corp.'s regulated utility operations in Alaska.

Avista Capital, a wholly owned non-regulated subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC. See Note 16 for business segment information. See Note 18 for discussion of assets held for sale at METALfx, an unregulated subsidiary of the Company.

Basis of Reporting

The condensed consolidated financial statements include the assets, liabilities, revenues and expenses of the Company and its subsidiaries and other majority owned subsidiaries and variable interest entities for which the Company or its subsidiaries are the primary beneficiaries. Intercompany balances were eliminated in consolidation. The accompanying condensed consolidated financial statements include the Company’s proportionate share of utility plant and related operations resulting from its interests in jointly owned plants.

Derivative Assets and Liabilities

Derivatives are recorded as either assets or liabilities on the Condensed Consolidated Balance Sheets measured at estimated fair value.

The WUTC and the IPUC issued accounting orders authorizing Avista Corp. to offset energy commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of delivery. Realized benefits and costs result in adjustments to retail rates through PGAs, the ERM in Washington, the PCA mechanism in Idaho, and periodic general rate cases. The resulting regulatory assets associated with energy commodity derivative instruments have been concluded to be probable of recovery through future rates.

Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized unless there is a decline in the fair value of the contract that is determined to be other-than-temporary.

For interest rate swap derivatives, Avista Corp. records all mark-to-market gains and losses in each accounting period as assets and liabilities, as well as offsetting regulatory assets and liabilities, such that there is no income statement impact. The interest rate swap derivatives are risk management tools similar to energy commodity derivatives. Upon settlement of interest rate swap derivatives, the regulatory asset or liability is amortized as a component of interest expense over the term of the associated debt. The Company records an offset of interest rate swap derivative assets and liabilities with regulatory assets and liabilities, based on the prior practice of the commissions to provide recovery through the ratemaking process.

The Company has multiple master netting agreements with a variety of entities that allow for cross-commodity netting of derivative agreements with the same counterparty (i.e. power derivatives can be netted with natural gas derivatives). In addition, some master netting agreements allow for the netting of commodity derivatives and interest rate swap derivatives for the same counterparty. The Company does not have any agreements which allow for cross-affiliate netting among multiple affiliated legal entities. The Company nets all derivative instruments when allowed by the agreement for presentation in the Condensed Consolidated Balance Sheets.

Fair Value Measurements

Fair value represents the price that would be received when selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Energy commodity derivative assets and liabilities, deferred compensation assets, as well as derivatives related to interest rate swaps and foreign currency exchange contracts, are reported at estimated fair value on the Condensed Consolidated Balance Sheets. See Note 11 for the Company’s fair value disclosures.

Contingencies

The Company has unresolved regulatory, legal and tax issues which have inherently uncertain outcomes. The Company accrues a loss contingency if it is probable that a liability has been incurred and the amount of the loss or impairment can be reasonably estimated. The Company also discloses loss contingencies that do not meet these conditions for accrual if there is a reasonable possibility that a material loss may be incurred. As of March 31, 2019, the Company has not recorded any significant amounts related to unresolved contingencies. See Note 15 for further discussion of the Company's commitments and contingencies.

XML

New Accounting Standards

3 Months Ended

Mar. 31, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Standards

NEW ACCOUNTING STANDARDS

ASU No. 2016-02, "Leases (Topic 842)"

ASU No. 2018-01, "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842"

ASU No. 2018-11, "Leases (Topic 842): Targeted Improvements"

On January 1, 2019, the Company adopted ASU No. 2016-02, which outlines a model for entities to use in accounting for leases and supersedes previous lease accounting guidance, as well as several practical expedients in ASU Nos. 2018-01 and 2018-11.

The Company adopted ASU No. 2016-02 utilizing a modified retrospective adoption method with the "package of three" and hindsight practical expedients offered by the standard. The "package of three" provides for an entity to not reassess at adoption whether any expired or existing contracts are deemed, for accounting purposes, to be or contain leases, the classification of any expired or existing leases, and any initial direct costs for any existing leases. As a result, the Company did not apply the new guidance to existing contracts that are or contain leases, and did not reassess the classification of those leases. The Company used the benefit of hindsight in determining both term and impairments associated with any existing leases. Use of this practical expedient has resulted in lease terms that best represent management's expectations with respect to use of the underlying asset but did not result in recognition of any impairment.

The Company elected to adopt ASU No. 2018-01, which allows an entity to exclude from application of Topic 842 all easements executed prior to January 1, 2019. In addition, the Company elected to adopt the "comparatives under 840" practical expedient offered in ASU No. 2018-11, which allows an entity to apply the new lease standard at the adoption date, recognizing any necessary cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption and presenting comparative periods in the financial statements under ASC 840 (previous lease accounting guidance). Adoption of the standard did not result in a cumulative effect adjustment within the Company's financial statements.

As allowed by ASU No. 2016-02, the Company elected not to apply the requirements of the standard to short-term leases, those leases with an initial term of 12 months or less. These leases are not recorded on the balance sheet and are immaterial to the financial statements.

Adoption of the standard impacted the Company's Condensed Consolidated Balance Sheet through recognition of right-of-use (ROU) assets and lease liabilities for the Company's operating leases. Accounting for finance leases (formerly capital leases) remained substantially unchanged, except the Company reclassified the amounts as of December 31, 2018 to conform to the presentation of operating leases as of March 31, 2019. See Note 5 for further information on the Company's leases.

ASU No. 2018-02 “Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”

In February 2018, the FASB issued ASU No. 2018-02, which amended the guidance for reporting comprehensive income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the enactment of the TCJA in December 2017. This ASU became effective for periods beginning after December 15, 2018 and early adoption was permitted. Upon adoption, the requirements of this ASU must be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the TCJA is recognized. The Company early adopted this standard effective January 1, 2018 and elected to apply the guidance during the period of adoption rather than apply the standard retrospectively. As a result, the Company reclassified $1.7 million in tax benefits from accumulated other comprehensive loss to retained earnings during the three months ended March 31, 2018.

ASU 2018-13 " Fair Value Measurement (Topic 820)"

In August 2018, the FASB issued ASU No. 2018-13, which amends the fair value measurement disclosure requirements of ASC 820. The requirements of this ASU include additional disclosure regarding the range and weighted average used to develop significant unobservable inputs for Level 3 fair value estimates and the elimination of certain other previously required disclosures, such as the narrative description of the valuation process for Level 3 fair value measurements. This ASU is effective for periods beginning after December 15, 2019 and early adoption is permitted. Entities have the option to early adopt the eliminated or modified disclosure requirements and delay the adoption of all the new disclosure requirementsuntil the effective date of the ASU. The Company is in the process of evaluating this standard; however, it has determined that it will not early adopt any portion of this standard as of March 31, 2019.

ASU No. 2018-14 "Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20)"

In August 2018, the FASB issued ASU No. 2018-14, which amends ASC 715 to add, remove and/or clarify certain disclosure requirements related to defined benefit pension and other postretirement plans. The additional disclosure requirements are primarily narrative discussion of significant changes in the benefit obligations and plan assets. The removed disclosures are primarily information about accumulated other comprehensive income expected to be recognized over the next year and the effects of changes associated with assumed health care costs. This ASU is effective for periods beginning after December 15, 2021 and early adoption is permitted. The Company is in the process of evaluating this standard; however, it has determined that it will not early adopt this standard as of March 31, 2019.

XML

Balance Sheet Components Balance Sheet Components (Notes)

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Supplemental Balance Sheet Disclosures [Text Block]

BALANCE SHEET COMPONENTS

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Materials and supplies	$	47,705	$	47,403
Fuel stock	4,930		4,869
Stored natural gas	8,719		11,609
Total	$	61,354	$	63,881

Other Current Assets

Other current assets consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$	37,347	$	26,809
Prepayments	16,647		17,536
Other	6,954		9,665
Total	$	60,948	$	54,010

Net Utility Property

Net utility property consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Utility plant in service	$	6,202,942	$	6,209,968
Construction work in progress	165,725		160,598
Total	6,368,667		6,370,566
Less: Accumulated depreciation and amortization	1,742,613		1,721,636
Total net utility property	$	4,626,054	$	4,648,930

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Operating lease ROU assets	$	70,834	$	—
Finance lease ROU assets	53,711		—
Non-utility property	29,557		31,355
Equity investments	32,967		29,257
Investment in affiliated trust	11,547		11,547
Notes receivable	11,161		11,073
Deferred compensation assets	8,675		8,400
Other	22,751		23,065
Total	$	241,203	$	114,697

Other Current Liabilities

Other current liabilities consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Accrued taxes other than income taxes	$	49,206	$	36,858
Income taxes payable	20,368		141
Employee paid time off accruals	21,813		20,992
Accrued interest	30,315		16,704
Current portion of pensions and other postretirement benefits	9,503		9,151
Operating lease liabilities	4,120		—
Finance lease liabilities	2,695		—
Utility energy commodity derivative liabilities	4,035		3,908
Other current liabilities	33,399		32,604
Total other current liabilities	$	175,454	$	120,358

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Operating lease liabilities	$	67,635	$	—
Finance lease liabilities	53,850		—
Deferred investment tax credits	31,383		29,725
Asset retirement obligations	18,455		18,266
Derivative liabilities	10,861		10,300
Other	13,564		12,740
Total	$	195,748	$	71,031

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	28,159	$	11,862	$	41,428	$	16,866
Decoupling surcharge	6,782		8,395		3,408		17,501
Pension and other postretirement benefit plans	—		224,805		—		228,062
Interest rate swaps	—		138,327		—		133,854
Deferred income taxes	—		93,646		—		91,188
Settlement with Coeur d'Alene Tribe	—		42,316		—		42,643
Demand side management programs	—		15,064		—		19,674
Utility plant to be abandoned	—		24,477		—		24,334
Other regulatory assets	6,625		46,605		3,716		40,232
Total regulatory assets	$	41,566	$	605,497	$	48,552	$	614,354
Regulatory Liabilities
Income tax related liabilities	$	29,401	$	421,216	$	27,997	$	425,613
Deferred natural gas costs	1,253		—		40,713		—
Deferral power costs	12,555		26,106		25,072		16,933
Decoupling rebate	1,061		4,664		6,782		204
Utility plant retirement costs	—		300,373		—		297,379
Interest rate swaps	—		20,396		—		28,078
Other regulatory liabilities	11,194		13,478		12,645		12,494
Total regulatory liabilities	$	55,464	$	786,233	$	113,209	$	780,701

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Revenue Revenue (Notes)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

REVENUE

ASC 606 defines the core principle of the revenue recognition model is that an entity should identify the various performance obligations in a contract, allocate the transaction price among the performance obligations and recognize revenue when (or as) the entity satisfies each performance obligation.

Utility Revenues

Revenue from Contracts with Customers

General

The majority of Avista Corp.’s revenue is from rate-regulated sales of electricity and natural gas to retail customers, which has two performance obligations, (1) having service available for a specified period (typically a month at a time) and (2) the delivery of energy to customers. The total energy price generally has a fixed component (basic charge) related to having service available and a usage-based component, related to the delivery and consumption of energy. The commodity is sold and/or delivered to and consumed by the customer simultaneously, and the provisions of the relevant utility commission authorization determine the charges the Company may bill the customer. Given that all revenue recognition criteria are met upon the delivery of energy to customers, revenue is recognized immediately at that time.

Revenues from contracts with customers are presented in the Condensed Consolidated Statements of Income in the line item "Utility revenues, exclusive of alternative revenue programs."

Non-Derivative Wholesale Contracts

The Company has certain wholesale contracts which are not accounted for as derivatives and, accordingly, are within the scope of ASC 606 and considered revenue from contracts with customers. Revenue is recognized as energy is delivered to the customer or the service is available for a specified period of time, consistent with the discussion of rate-regulated sales above.

Alternative Revenue Programs (Decoupling)

ASC 606 retained existing GAAP associated with alternative revenue programs, which specified that alternative revenue programs are contracts between an entity and a regulator of utilities, not a contract between an entity and a customer. GAAP requires that an entity present revenue arising from alternative revenue programs separately from revenues arising from contracts with customers on the face of the Condensed Consolidated Statements of Income. The Company's decoupling mechanisms (also known as a FCA in Idaho) qualify as alternative revenue programs. Decoupling revenue deferrals are recognized in the Condensed Consolidated Statements of Income during the period they occur (i.e. during the period of revenue shortfall or excess due to fluctuations in customer usage), subject to certain limitations, and a regulatory asset or liability is established that will be surcharged or rebated to customers in future periods. GAAP requires that for any alternative revenue program, like decoupling, the revenue must be expected to be collected from customers within 24 months of the deferral to qualify for recognition in the current period Condensed Consolidated Statement of Income. Any amounts included in the Company's decoupling program that are not expected to be collected from customers within 24 months are not recorded in the financial statements until the period in which revenue recognition criteria are met. The amounts expected to be collected from customers within 24 months represents an estimate that must be made by the Company on an ongoing basis due to it being based on the volumes of electric and natural gas sold to customers on a go-forward basis.

Derivative Revenue

Most wholesale electric and natural gas transactions (including both physical and financial transactions), and the sale of fuel are considered derivatives, which are specifically scoped out of ASC 606. As such, these revenues are disclosed separately from revenue from contracts with customers. Revenue is recognized for these items upon the settlement/expiration of the derivative contract. Derivative revenue includes those transactions that are entered into and settled within the same month.

Other Utility Revenue

Other utility revenue includes rent, revenues from the lineman training school, sales of materials, late fees and other charges that do not represent contracts with customers.Other utility revenue also includes the provision for earnings sharing and the deferral and amortization of refunds to customers associated with the TCJA. This revenue is scoped out of ASC 606, as this revenue does not represent items where a customer is a party that has contracted with the Company to obtain goods or services that are an output of the Company’s ordinary activities in exchange for consideration. As such, these revenues are presented separately from revenue from contracts with customers.

Other Considerations for Utility Revenues

Gross Versus Net Presentation

Revenues and resource costs from Avista Utilities’ settled energy contracts that are “booked out” (not physically delivered) are reported on a net basis as part of derivative revenues.

Utility-related taxes collected from customers (primarily state excise taxes and city utility taxes) are taxes that are imposed on Avista Utilities as opposed to being imposed on its customers; therefore, Avista Utilities is the taxpayer and records these transactions on a gross basis in revenue from contracts with customers and operating expense (taxes other than income taxes). The utility-related taxes collected from customers at AEL&P are imposed on the customers rather than AEL&P; therefore, the customers are the taxpayers and AEL&P is acting as their agent. As such, these transactions at AEL&P are presented on a net basis within revenue from contracts with customers.

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2019		2018
Utility-related taxes	$	19,089	$	19,167

Non-Utility Revenues

Revenue from Contracts with Customers

Non-utility revenues from contracts with customers are primarily derived from the operations of METALfx. The contracts associated with METALfx have one performance obligation, the delivery of a product, and revenues are recognized when the risk of loss transfers to the customer, which occurs when products are shipped.

Significant Judgments and Unsatisfied Performance Obligations

The only significant judgments involving revenue recognition are estimates surrounding unbilled revenue and receivables from contracts with customers and estimates surrounding the amount of decoupling revenues that will be collected from customers within 24 months (discussed above).

The Company has certain capacity arrangements, where the Company has a contractual obligation to provide either electric or natural gas capacity to its customers for a fixed fee. Most of these arrangements are paid for in arrears by the customers and do not result in deferred revenue and only result in receivables from the customers. The Company does have one capacity agreement where the customer makes payments throughout the year and depending on the timing of the customer payments, it can result in an immaterial amount of deferred revenue or a receivable from the customer. As of March 31, 2019, the Company estimates it had unsatisfied capacity performance obligations of $9.1 million, which will be recognized as revenue in future periods as the capacity is provided to the customers. These performance obligations are not reflected in the financial statements, as the Company has not received payment for these services.

Disaggregation of Total Operating Revenue

The following table disaggregates total operating revenue by segment and source for the three months ended March 31 (dollars in thousands):

	2019			2018
Avista Utilities
Revenue from contracts with customers	$	354,301		$	354,162
Derivative revenues	24,127			58,392
Alternative revenue programs	(4,658		)	(5,939		)
Deferrals and amortizations for rate refunds to customers	2,135			(19,822		)
Other utility revenues	1,797			1,961
Total Avista Utilities	377,702			388,754
AEL&P
Revenue from contracts with customers	10,736			14,650
Deferrals and amortizations for rate refunds to customers	(48		)	(1,122		)
Other utility revenues	193			135
Total AEL&P	10,881			13,663
Other
Revenue from contracts with customers	7,647			6,729
Other revenues	251			215
Total other	7,898			6,944
Total operating revenues	$	396,481		$	409,361

Utility Revenue from Contracts with Customers by Type and Service

The following table disaggregates revenue from contracts with customers associated with the Company's utility operations for the three months ended March 31 (dollars in thousands):

	2019						2018
	Avista Utilities		AEL&P		Total Utility		Avista Utilities		AEL&P		Total Utility
ELECTRIC OPERATIONS
Residential	$	115,392	$	5,852	$	121,244	$	114,753	$	6,538	$	121,291
Commercial and governmental	79,245		4,821		84,066		78,909		8,044		86,953
Industrial	25,248		—		25,248		25,119		—		25,119
Public street and highway lighting	1,903		63		1,966		1,859		68		1,927
Total retail revenue	221,788		10,736		232,524		220,640		14,650		235,290
Transmission	5,152		—		5,152		3,830		—		3,830
Other revenue from contracts with customers	8,194		—		8,194		6,291		—		6,291
Total electric revenue from contracts with customers	$	235,134	$	10,736	$	245,870	$	230,761	$	14,650	$	245,411
NATURAL GAS OPERATIONS
Residential	$	77,336	$	—	$	77,336	$	80,653	$	—	$	80,653
Commercial	36,595		—		36,595		37,373		—		37,373
Industrial and interruptible	1,627		—		1,627		1,683		—		1,683
Total retail revenue	115,558		—		115,558		119,709		—		119,709
Transportation	2,484		—		2,484		2,567		—		2,567
Other revenue from contracts with customers	1,125		—		1,125		1,125		—		1,125
Total natural gas revenue from contracts with customers	$	119,167	$	—	$	119,167	$	123,401	$	—	$	123,401

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Leases Leases (Notes)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lessee, Operating Leases [Text Block]

LEASES

ASC 842, which outlines a model for entities to use in accounting for leases and supersedes previous lease accounting guidance, became effective on January 1, 2019. The core principle of the model is that an entity should recognize the ROU assets and liabilities that arise from leases on the balance sheet and depreciate or amortize the asset and liability over the term of the lease, as well as provide disclosure to enable users of the condensed consolidated financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases.

Significant Judgments and Assumptions

The Company determines if an arrangement is a lease, as well as its classification, at its inception.

ROU assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and lease liabilities are recognized at the commencement date of the agreement based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date to determine the present value of lease payments. The implicit rate is used when it is readily determinable. The operating and finance lease ROU assets also include any lease payments made and exclude lease incentives, if any, that accrue to the benefit of the lessee.

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Any difference between lease expense and cash paid for leased assets is recognized as a regulatory asset or regulatory liability.

Description of Leases

The Company has operating leases for land associated with its utility operations, as well as communication sites which support network and radio communications within its service territory. The Company's leases have remaining terms of 1 to 74 years. Most of the Company's leases include options to extend the lease term for periods of 5 to 50 years. Exercise of these options is at the Company's discretion.

The Company has an operating lease with the state of Montana associated with submerged land around the Company's hydroelectric facilities in the Clark Fork River basin, which expires in 2046. The terms of this lease are subject to renegotiation, depending on the outcome of ongoing litigation between Montana and NorthWestern Energy. In addition, the state of Montana and Avista Corp. are engaged in litigation regarding the lease terms. As such, amounts recorded for this lease are uncertain and amounts may change in the future depending on the outcome of the ongoing litigation.

Through its wholly-owned subsidiary, AEL&P, the Company has a PPA which is treated as a finance lease for accounting purposes related to the Snettisham Hydroelectric Project, which expires in 2034. For ratemaking purposes, this lease is treated as an operating lease with a constant level of annual rental expense (straight line rent expense). Because of this regulatory treatment, any difference between the operating lease expense for ratemaking purposes and the expenses recognized under finance lease treatment (interest and amortization of the finance lease ROU asset) is recorded as a regulatory asset and amortized during the later years of the lease when the finance lease expense is less than the operating lease expense included in base rates. In 2018 and prior years, the total cost associated with the Snettisham PPA was included in resource costs. Due to the adoption of the new lease standard, the amortization of the ROU asset is now included in depreciation and amortization and the interest associated with the lease liability is now included in interest expense on the Condensed Consolidated Statement of Income.

Certain of the Company's lease agreements include rental payments which are periodically adjusted over the term of the agreement based on the consumer price index. The Company's lease agreements do not include any material residual value guarantees or material restrictive covenants.

Avista Corp. does not record leases with a term of 12-months or less in the Condensed Consolidated Balance Sheet. Total short-term lease cost for the three months ended March 31, 2019 is immaterial. 

Leases that Have Not Yet Commenced

In March 2019, the Company signed a PPA with Clearway Energy Group (Clearway) to purchase all of the power generated from the Rattlesnake Flat Wind project in Adams County, Washington. The facility has a nameplate capacity of 144 MW and is expected to generate approximately 50 aMW. During negotiations with Clearway, Avista Corp. was involved in the selection of the preferred generation facility type. The PPA is a 20-year agreement with deliveries expected to begin in 2020. The PPA provides Avista Corp. with additional renewable energy, capacity and environmental attributes. Avista Corp. expects to recover the cost of the power purchased through its retail rates. This PPA is considered a lease under ASC 842; however, all of the payments are variable payments based on whether power is generated from the facility. Since all the payments are variable, the Company will not record a lease liability for the agreement, but the expense will be included in resource costs when it becomes operational in 2020.

The components of lease expense were as follows for the three months ended March 31 (dollars in thousands):

	2019
Operating lease cost:
Fixed lease cost (Other operating expenses)	$	1,103
Variable lease cost (Other operating expenses)	243
Total operating lease cost	$	1,346
Finance lease cost:
Amortization of ROU asset (Depreciation and amortization)	$	910
Interest on lease liabilities (Interest expense)	699
Total finance lease cost	$	1,609

Supplemental cash flow information related to leases was as follows for the three months ended March 31 (dollars in thousands):

	2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows:
Operating lease payments	$	4,092
Interest on finance lease	699
Total operating cash outflows	$	4,791
Finance cash outflows:
Principal payments on finance lease	$	665

Supplemental balance sheet information related to leases was as follows for March 31, 2019 (dollars in thousands):

	March 31,
	2019
Operating Leases
Operating lease ROU assets (Other property and investments-net and other non-current assets)	$	70,834
Other current liabilities	$	4,120
Other non-current liabilities and deferred credits	67,635
Total operating lease liabilities	$	71,755
Finance Leases
Finance lease ROU assets (Other property and investments-net and other non-current assets) (a)	$	53,711
Other current liabilities (b)	$	2,695
Other non-current liabilities and deferred credits (b)	53,850
Total finance lease liabilities	$	56,545
Weighted Average Remaining Lease Term
Operating leases	27.32 years
Finance leases	9.64 years
Weighted Average Discount Rate
Operating leases	3.82		%
Finance leases	4.85		%

(a) At December 31, 2018, the finance lease ROU assets were included in "Net utility property" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other property and investments-net and other non-current assets" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

(b) At December 31, 2018, the finance lease liabilities were included in "Current portion of long-term debt" and "Long-term debt and capital leases" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other current liabilities" and "Other non-current liabilities and deferred credits" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

Maturities of lease liabilities (including principal and interest) were as follows as of March 31, 2019 (dollars in thousands):

	Operating Leases			Finance Leases
Remainder 2019	$	4,272		$	4,091
2020	4,364			5,462
2021	4,367			5,457
2022	4,375			5,460
2023	4,383			5,456
Thereafter	95,923			54,574
Total lease payments	$	117,684		$	80,500
Less: imputed interest	(45,929		)	(23,955		)
Total	$	71,755		$	56,545

Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):

	Operating Leases		Finance Leases
2019	$	4,995	$	5,455
2020	4,876		5,462
2021	4,859		5,457
2022	4,782		5,460
2023	4,780		5,456
Thereafter	102,389		54,574
Total lease payments	$	126,681	$	81,864
Less: imputed interest	—		(24,654		)
Total	$	126,681	$	57,210

Lessee, Finance Leases [Text Block]

LEASES

ASC 842, which outlines a model for entities to use in accounting for leases and supersedes previous lease accounting guidance, became effective on January 1, 2019. The core principle of the model is that an entity should recognize the ROU assets and liabilities that arise from leases on the balance sheet and depreciate or amortize the asset and liability over the term of the lease, as well as provide disclosure to enable users of the condensed consolidated financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases.

Significant Judgments and Assumptions

The Company determines if an arrangement is a lease, as well as its classification, at its inception.

ROU assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Operating and finance lease ROU assets and lease liabilities are recognized at the commencement date of the agreement based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date to determine the present value of lease payments. The implicit rate is used when it is readily determinable. The operating and finance lease ROU assets also include any lease payments made and exclude lease incentives, if any, that accrue to the benefit of the lessee.

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. Any difference between lease expense and cash paid for leased assets is recognized as a regulatory asset or regulatory liability.

Description of Leases

The Company has operating leases for land associated with its utility operations, as well as communication sites which support network and radio communications within its service territory. The Company's leases have remaining terms of 1 to 74 years. Most of the Company's leases include options to extend the lease term for periods of 5 to 50 years. Exercise of these options is at the Company's discretion.

The Company has an operating lease with the state of Montana associated with submerged land around the Company's hydroelectric facilities in the Clark Fork River basin, which expires in 2046. The terms of this lease are subject to renegotiation, depending on the outcome of ongoing litigation between Montana and NorthWestern Energy. In addition, the state of Montana and Avista Corp. are engaged in litigation regarding the lease terms. As such, amounts recorded for this lease are uncertain and amounts may change in the future depending on the outcome of the ongoing litigation.

Through its wholly-owned subsidiary, AEL&P, the Company has a PPA which is treated as a finance lease for accounting purposes related to the Snettisham Hydroelectric Project, which expires in 2034. For ratemaking purposes, this lease is treated as an operating lease with a constant level of annual rental expense (straight line rent expense). Because of this regulatory treatment, any difference between the operating lease expense for ratemaking purposes and the expenses recognized under finance lease treatment (interest and amortization of the finance lease ROU asset) is recorded as a regulatory asset and amortized during the later years of the lease when the finance lease expense is less than the operating lease expense included in base rates. In 2018 and prior years, the total cost associated with the Snettisham PPA was included in resource costs. Due to the adoption of the new lease standard, the amortization of the ROU asset is now included in depreciation and amortization and the interest associated with the lease liability is now included in interest expense on the Condensed Consolidated Statement of Income.

Certain of the Company's lease agreements include rental payments which are periodically adjusted over the term of the agreement based on the consumer price index. The Company's lease agreements do not include any material residual value guarantees or material restrictive covenants.

Avista Corp. does not record leases with a term of 12-months or less in the Condensed Consolidated Balance Sheet. Total short-term lease cost for the three months ended March 31, 2019 is immaterial. 

Leases that Have Not Yet Commenced

In March 2019, the Company signed a PPA with Clearway Energy Group (Clearway) to purchase all of the power generated from the Rattlesnake Flat Wind project in Adams County, Washington. The facility has a nameplate capacity of 144 MW and is expected to generate approximately 50 aMW. During negotiations with Clearway, Avista Corp. was involved in the selection of the preferred generation facility type. The PPA is a 20-year agreement with deliveries expected to begin in 2020. The PPA provides Avista Corp. with additional renewable energy, capacity and environmental attributes. Avista Corp. expects to recover the cost of the power purchased through its retail rates. This PPA is considered a lease under ASC 842; however, all of the payments are variable payments based on whether power is generated from the facility. Since all the payments are variable, the Company will not record a lease liability for the agreement, but the expense will be included in resource costs when it becomes operational in 2020.

The components of lease expense were as follows for the three months ended March 31 (dollars in thousands):

	2019
Operating lease cost:
Fixed lease cost (Other operating expenses)	$	1,103
Variable lease cost (Other operating expenses)	243
Total operating lease cost	$	1,346
Finance lease cost:
Amortization of ROU asset (Depreciation and amortization)	$	910
Interest on lease liabilities (Interest expense)	699
Total finance lease cost	$	1,609

Supplemental cash flow information related to leases was as follows for the three months ended March 31 (dollars in thousands):

	2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows:
Operating lease payments	$	4,092
Interest on finance lease	699
Total operating cash outflows	$	4,791
Finance cash outflows:
Principal payments on finance lease	$	665

Supplemental balance sheet information related to leases was as follows for March 31, 2019 (dollars in thousands):

	March 31,
	2019
Operating Leases
Operating lease ROU assets (Other property and investments-net and other non-current assets)	$	70,834
Other current liabilities	$	4,120
Other non-current liabilities and deferred credits	67,635
Total operating lease liabilities	$	71,755
Finance Leases
Finance lease ROU assets (Other property and investments-net and other non-current assets) (a)	$	53,711
Other current liabilities (b)	$	2,695
Other non-current liabilities and deferred credits (b)	53,850
Total finance lease liabilities	$	56,545
Weighted Average Remaining Lease Term
Operating leases	27.32 years
Finance leases	9.64 years
Weighted Average Discount Rate
Operating leases	3.82		%
Finance leases	4.85		%

(a) At December 31, 2018, the finance lease ROU assets were included in "Net utility property" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other property and investments-net and other non-current assets" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

(b) At December 31, 2018, the finance lease liabilities were included in "Current portion of long-term debt" and "Long-term debt and capital leases" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other current liabilities" and "Other non-current liabilities and deferred credits" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

Maturities of lease liabilities (including principal and interest) were as follows as of March 31, 2019 (dollars in thousands):

	Operating Leases			Finance Leases
Remainder 2019	$	4,272		$	4,091
2020	4,364			5,462
2021	4,367			5,457
2022	4,375			5,460
2023	4,383			5,456
Thereafter	95,923			54,574
Total lease payments	$	117,684		$	80,500
Less: imputed interest	(45,929		)	(23,955		)
Total	$	71,755		$	56,545

Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):

	Operating Leases		Finance Leases
2019	$	4,995	$	5,455
2020	4,876		5,462
2021	4,859		5,457
2022	4,782		5,460
2023	4,780		5,456
Thereafter	102,389		54,574
Total lease payments	$	126,681	$	81,864
Less: imputed interest	—		(24,654		)
Total	$	126,681	$	57,210

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Derivatives And Risk Management

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedges, Assets [Abstract]

Derivatives And Risk Management

DERIVATIVES AND RISK MANAGEMENT

Energy Commodity Derivatives

Avista Corp. is exposed to market risks relating to changes in electricity and natural gas commodity prices and certain other fuel prices. Market risk is, in general, the risk of fluctuation in the market price of the commodity being traded and is influenced primarily by supply and demand. Market risk includes the fluctuation in the market price of associated derivative commodity instruments. Avista Corp. utilizes derivative instruments, such as forwards, futures, swap derivatives and options, in order to manage the various risks relating to these commodity price exposures. Avista Corp. has an energy resources risk policy and control procedures to manage these risks.

As part of Avista Corp.'s resource procurement and management operations in the electric business, Avista Corp. engages in an ongoing process of resource optimization, which involves the economic selection from available energy resources to serve Avista Corp.'s load obligations and the use of these resources to capture available economic value through wholesale market transactions. These include sales and purchases of electric capacity and energy, fuel for electric generation, and derivative contracts related to capacity, energy and fuel. Such transactions are part of the process of matching resources with load obligations and hedging a portion of the related financial risks. These transactions range from terms of intra-hour up to multiple years.

As part of its resource procurement and management of its natural gas business, Avista Corp. makes continuing projections of its natural gas loads and assesses available natural gas resources including natural gas storage availability. Natural gas resource planning typically includes peak requirements, low and average monthly requirements and delivery constraints from natural gas supply locations to Avista Corp.’s distribution system. However, daily variations in natural gas demand can be significantly different than monthly demand projections. On the basis of these projections, Avista Corp. plans and executes a series of transactions to hedge a portion of its projected natural gas requirements through forward market transactions and derivative instruments. These transactions may extend as much as four natural gas operating years (November through October) into the future. Avista Corp. also leaves a significant portion of its natural gas supply requirements unhedged for purchase in short-term and spot markets.

Avista Corp. plans for sufficient natural gas delivery capacity to serve its retail customers for a theoretical peak day event. Avista Corp. generally has more pipeline and storage capacity than what is needed during periods other than a peak-day. Avista Corp. optimizes its natural gas resources by using market opportunities to generate economic value that helps mitigate fixed costs. Avista Corp. also optimizes its natural gas storage capacity by purchasing and storing natural gas when prices are traditionally lower, typically in the summer, and withdrawing during higher priced months, typically during the winter. However, if market conditions and prices indicate that Avista Corp. should buy or sell natural gas at other times during the year, Avista Corp. engages in optimization transactions to capture value in the marketplace. Natural gas optimization activities include, but are not limited to, wholesale market sales of surplus natural gas supplies, purchases and sales of natural gas to optimize use of pipeline and storage capacity, and participation in the transportation capacity release market.

The following table presents the underlying energy commodity derivative volumes as of March 31, 2019 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases				Sales
	Electric Derivatives		Gas Derivatives		Electric Derivatives		Gas Derivatives
Year	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs
Remainder 2019	30	596	4,640	81,438	109	2,280	669	35,913
2020	—	—	1,138	53,388	123	959	1,430	16,378
2021	—	—	—	15,290	—	246	1,049	4,100
2022	—	—	—	—	—	—	—	—
2023	—	—	—	—	—	—	—	—
Thereafter	—	—	—	—	—	—	—	—

The following table presents the underlying energy commodity derivative volumes as of December 31, 2018 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases				Sales
	Electric Derivatives		Gas Derivatives		Electric Derivatives		Gas Derivatives
Year	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs
2019	206	941	10,732	101,293	197	2,790	2,909	54,418
2020	—	—	1,138	47,225	123	959	1,430	14,625
2021	—	—	—	9,670	—	—	1,049	4,100
2022	—	—	—	—	—	—	—	—
2023	—	—	—	—	—	—	—	—
Thereafter	—	—	—	—	—	—	—	—

(1) Physical transactions represent commodity transactions in which Avista Corp. will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

The electric and natural gas derivative contracts above will be included in either power supply costs or natural gas supply costs during the period they are delivered and will be included in the various deferral and recovery mechanisms (ERM, PCA and PGAs), or in the general rate case process, and are expected to be collected through retail rates from customers.

Foreign Currency Exchange Derivatives

A significant portion of Avista Corp.’s natural gas supply (including fuel for power generation) is obtained from Canadian sources. Most of those transactions are executed in U.S. dollars, which avoids foreign currency risk. A portion of Avista Corp.’s short-term natural gas transactions and long-term Canadian transportation contracts are committed based on Canadian currency prices and settled within 60 days with U.S. dollars. Avista Corp. hedges a portion of the foreign currency risk by purchasing Canadian currency exchange derivatives when such commodity transactions are initiated. The foreign currency exchange derivatives and the unhedged foreign currency risk have not had a material effect on Avista Corp.’s financial condition, results of operations or cash flows and these differences in cost related to currency fluctuations are included with natural gas supply costs for ratemaking.

The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Number of contracts	22		31
Notional amount (in United States dollars)	$	6,681	$	4,018
Notional amount (in Canadian dollars)	8,917		5,386

Interest Rate Swap Derivatives

Avista Corp. is affected by fluctuating interest rates related to a portion of its existing debt, and future borrowing requirements. Avista Corp. hedges a portion of its interest rate risk with financial derivative instruments, which may include interest rate swap derivatives and U.S. Treasury lock agreements. These interest rate swap derivatives and U.S. Treasury lock agreements are considered economic hedges against fluctuations in future cash flows associated with anticipated debt issuances.

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2019 and December 31, 2018 (dollars in thousands):

Balance Sheet Date	Number of Contracts	Notional Amount		Mandatory Cash Settlement Date
March 31, 2019	6	$	70,000	2019
	6	60,000		2020
	2	25,000		2021
	8	90,000		2022
December 31, 2018	6	$	70,000	2019
	6	60,000		2020
	2	25,000		2021
	7	80,000		2022

Upon settlement of interest rate swap derivatives, the cash payments made or received are recorded as a regulatory asset or liability and are subsequently amortized as a component of interest expense over the life of the associated debt. The settled interest rate swap derivatives are also included as a part of Avista Corp.'s cost of debt calculation for ratemaking purposes.

The fair value of outstanding interest rate swap derivatives can vary significantly from period to period depending on the total notional amount of swap derivatives outstanding and fluctuations in market interest rates compared to the interest rates fixed by the swaps. Avista Corp. is required to make cash payments to settle the interest rate swap derivatives when the fixed rates are higher than prevailing market rates at the date of settlement. Conversely, Avista Corp. receives cash to settle its interest rate swap derivatives when prevailing market rates at the time of settlement exceed the fixed swap rates.

Summary of Outstanding Derivative Instruments

The amounts recorded on the Condensed Consolidated Balance Sheet as of March 31, 2019 and December 31, 2018 reflect the offsetting of derivative assets and liabilities where a legal right of offset exists.

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2019 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	15	$	(15	)	$	—	$	—
Interest rate swap derivatives
Other current assets	2,587		(530		)	—		2,057
Other property and investments-net and other non-current assets	2,503		(1,754		)	—		749
Other current liabilities	—		(524		)	—		(524		)
Other non-current liabilities and deferred credits	—		(12,402		)	2,860		(9,542		)
Energy commodity derivatives
Other current assets	262		(12		)	—		250
Other current liabilities	26,875		(55,284		)	24,374		(4,035		)
Other non-current liabilities and deferred credits	4,349		(16,211		)	10,543		(1,319		)
Total derivative instruments recorded on the balance sheet	$	36,591	$	(86,732	)	$	37,777	$	(12,364	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2018 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	—	$	(45	)	$	—	$	(45	)
Interest rate swap derivatives
Other current assets	5,283		—			—		5,283
Other property and investments-net and other non-current assets	5,283		(440		)	—		4,843
Other non-current liabilities and deferred credits	—		(7,391		)	530		(6,861		)
Energy commodity derivatives
Other current assets	400		(130		)	—		270
Other current liabilities	31,457		(73,155		)	37,790		(3,908		)
Other non-current liabilities and deferred credits	4,426		(21,292		)	13,427		(3,439		)
Total derivative instruments recorded on the balance sheet	$	46,849	$	(102,453	)	$	51,747	$	(3,857	)

Exposure to Demands for Collateral

Avista Corp.'s derivative contracts often require collateral (in the form of cash or letters of credit) or other credit enhancements, or reductions or terminations of a portion of the contract through cash settlement. In the event of a downgrade in Avista Corp.'s credit ratings or changes in market prices, additional collateral may be required. In periods of price volatility, the level of exposure can change significantly. As a result, sudden and significant demands may be made against Avista Corp.'s credit facilities and cash. Avista Corp. actively monitors the exposure to possible collateral calls and takes steps to mitigate capital requirements.

The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Energy commodity derivatives
Cash collateral posted	$	72,264	$	78,025
Letters of credit outstanding	56,100		6,500
Balance sheet offsetting (cash collateral against net derivative positions)	34,917		51,217
Interest rate swap derivatives
Cash collateral posted	2,860		530
Balance sheet offsetting (cash collateral against net derivative positions)	2,860		530

Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Energy commodity derivatives
Liabilities with credit-risk-related contingent features	$	1,406	$	2,193
Additional collateral to post	1,415		2,193
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features	15,210		7,831
Additional collateral to post	10,064		6,579

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Pension Plans And Other Postretirement Benefit Plans

3 Months Ended

Mar. 31, 2019

Retirement Benefits, Description [Abstract]

Pension Plans and Other Postretirement Benefit Plans

PENSION PLANS AND OTHER POSTRETIREMENT BENEFIT PLANS

Avista Utilities

Avista Utilities’ maintained the same pension and other postretirement plans during the three months ended March 31, 2019 as those described as of December 31, 2018. The Company’s funding policy is to contribute at least the minimum amounts that are required to be funded under the Employee Retirement Income Security Act, but not more than the maximum amounts that are currently deductible for income tax purposes. The Company contributed $7.3 million in cash to the pension plan for the three months ended March 31, 2019 and it expects to contribute a total of $22.0 million in 2019.

The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three months ended March 31 (dollars in thousands):

	Pension Benefits						Other Postretirement Benefits
	2019			2018			2019			2018
Service cost (a)	$	4,874		$	5,450		$	772		$	804
Interest cost	7,138			6,466			1,372			1,197
Expected return on plan assets	(7,815		)	(8,250		)	(718		)	(500		)
Amortization of prior service cost	75			75			(275		)	(815		)
Net loss recognition	2,415			2,088			1,246			1,655
Net periodic benefit cost	$	6,687		$	5,829		$	2,397		$	2,341

(a) Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 40 percent of all labor and benefits is capitalized to utility property and 60 percent is expensed to utility other operating expenses.

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Income Taxes Income Taxes (Notes)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

INCOME TAXES

The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):

	2019					2018
Federal income taxes at statutory rates	$	30,639		21.0	%	$	13,790		21.0	%
Increase (decrease) in tax resulting from:
Tax effect of regulatory treatment of utility plant differences	(2,080		)	(1.4	)	(1,018		)	(1.6	)
State income tax expense	1,659			1.1		964			1.5
Acquisition costs	(1,824		)	(1.2	)	46			0.1
Settlement of equity awards	612			0.4		(990		)	(1.5	)
Other	1,011			0.7		(2,082		)	(3.2	)
Total income tax expense	$	30,017		20.6	%	$	10,710		16.3	%

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Committed Lines of Credit

3 Months Ended

Mar. 31, 2019

Short-term Debt [Abstract]

Committed Lines of Credit

COMMITTED LINES OF CREDIT

Avista Corp.

Avista Corp. has a committed line of credit with various financial institutions in the total amount of $400.0 million that expires in April 2021. The committed line of credit is secured by non-transferable first mortgage bonds of the Company issued to the agent bank that would only become due and payable in the event, and then only to the extent, that the Company defaults on its obligations under the committed line of credit.

Balances outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,			December 31,
	2019			2018
Balance outstanding at end of period (1)	$	119,000		$	190,000
Letters of credit outstanding at end of period	$	60,103		$	10,503
Average interest rate at end of period	3.31		%	3.18		%

(1) As of March 31, 2019 and December 31, 2018, the balance outstanding was classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

AEL&P

AEL&P has a committed line of credit in the amount of $25.0 million that expires in November 2019. As of March 31, 2019 and December 31, 2018, there were no borrowings or letters of credit outstanding under this committed line of credit. The committed line of credit is secured by non-transferable first mortgage bonds of AEL&P issued to the agent bank that would only become due and payable in the event, and then only to the extent, that AEL&P defaults on its obligations under the committed line of credit.

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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Notes)

3 Months Ended

Mar. 31, 2019

Long-Term Debt to Affiliated Trust [Abstract]

Long Term Debt To Affiliated Trusts Disclosure [Text Block]

LONG-TERM DEBT TO AFFILIATED TRUSTS

In 1997, the Company issued Floating Rate Junior Subordinated Deferrable Interest Debentures, Series B, with a principal amount of $51.5 million to Avista Capital II, an affiliated business trust formed by the Company. Avista Capital II issued $50.0 million of Preferred Trust Securities with a floating distribution rate of LIBOR plus 0.875 percent, calculated and reset quarterly.

The distribution rates paid were as follows during the three months ended March 31, 2019 and the year ended December 31, 2018:

	March 31,		December 31,
	2019		2018
Low distribution rate	3.50	%	2.36	%
High distribution rate	3.61	%	3.61	%
Distribution rate at the end of the period	3.50	%	3.61	%

Concurrent with the issuance of the Preferred Trust Securities, Avista Capital II issued $1.5 million of Common Trust Securities to the Company. The Preferred Trust Securities may be redeemed at the option of Avista Capital II at any time and mature on June 1, 2037. In December 2000, the Company purchased $10.0 million of these Preferred Trust Securities.

The Company owns 100 percent of Avista Capital II and has solely and unconditionally guaranteed the payment of distributions on, and redemption price and liquidation amount for, the Preferred Trust Securities to the extent that Avista Capital II has funds available for such payments from the respective debt securities. Upon maturity or prior redemption of such debt securities, the Preferred Trust Securities will be mandatorily redeemed. The Company does not include these capital trusts in its consolidated financial statements as Avista Corp. is not the primary beneficiary. As such, the sole assets of the capital trusts are $51.5 million of junior subordinated deferrable interest debentures of Avista Corp., which are reflected on the Condensed Consolidated Balance Sheets. Interest expense to affiliated trusts in the Condensed Consolidated Statements of Income represents interest expense on these debentures.

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Fair Value

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value

FAIR VALUE

The carrying values of cash and cash equivalents, accounts and notes receivable, accounts payable, and short-term borrowings are reasonable estimates of their fair values. Long-term debt (including current portion and material capital leases) and long-term debt to affiliated trusts are reported at carrying value on the Condensed Consolidated Balance Sheets.

The fair value hierarchy prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to fair values derived from unobservable inputs (Level 3 measurement).

The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities. Active markets are those in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 – Pricing inputs are other than quoted prices in active markets included in Level 1, but which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace.

Level 3 – Pricing inputs include significant inputs that are generally unobservable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value.

Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The determination of the fair values incorporates various factors that not only include the credit standing of the counterparties involved and the impact of credit enhancements (such as cash deposits and letters of credit), but also the impact of Avista Corp.’s nonperformance risk on its liabilities.

The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Long-term debt (Level 2)	$	1,053,500	$	1,155,199	$	1,053,500	$	1,142,292
Long-term debt (Level 3)	767,000		734,742		767,000		734,742
Snettisham finance lease obligation (Level 3)	56,545		56,900		57,210		55,600
Long-term debt to affiliated trusts (Level 3)	51,547		38,145		51,547		38,145

These estimates of fair value of long-term debt and long-term debt to affiliated trusts were primarily based on available market information, which generally consists of estimated market prices from third party brokers for debt with similar risk and terms. The price ranges obtained from the third party brokers consisted of par values of 74.00 to 121.59, where a par value of 100.0 represents the carrying value recorded on the Condensed Consolidated Balance Sheets. Level 2 long-term debt represents publicly issued bonds with quoted market prices; however, due to their limited trading activity, they are classified as Level 2 because brokers must generate quotes and make estimates if there is no trading activity near a period end. Level 3 long-term debt consists of private placement bonds and debt to affiliated trusts, which typically have no secondary trading activity. Fair values in Level 3 are estimated based on market prices from third party brokers using secondary market quotes for debt with similar risk and terms to generate quotes for Avista Corp. bonds. Due to the unique nature of the Snettisham capital lease obligation, the estimated fair value of these items was determined based on a discounted cash flow model using available market information. The Snettisham capital lease obligation was discounted to present value using the Morgan Markets A Ex-Fin discount rate as published on March 31, 2019.

The following table discloses by level within the fair value hierarchy the Company’s assets and liabilities measured and reported on the Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018 at fair value on a recurring basis (dollars in thousands):

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
March 31, 2019
Assets:
Energy commodity derivatives	$	—	$	31,363	$	—	$	(31,113	)	$	250
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		123		(123		)	—
Foreign currency exchange derivatives	—		15		—		(15		)	—
Interest rate swap derivatives	—		5,090		—		(2,284		)	2,806
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)	1,758		—		—		—			1,758
Equity securities (2)	6,456		—		—		—			6,456
Total	$	8,214	$	36,468	$	123	$	(33,535	)	$	11,270
Liabilities:
Energy commodity derivatives	$	—	$	68,668	$	—	$	(66,030	)	$	2,638
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		2,227		(123		)	2,104
Power exchange agreement	—		—		612		—			612
Foreign currency exchange derivatives	—		15		—		(15		)	—
Interest rate swap derivatives	—		15,210		—		(5,144		)	10,066
Total	$	—	$	83,893	$	2,839	$	(71,312	)	$	15,420

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
December 31, 2018
Assets:
Energy commodity derivatives	$	—	$	36,252	$	—	$	(35,982	)	$	270
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		31		(31		)	—
Interest rate swap derivatives	—		10,566		—		(440		)	10,126
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)	1,745		—		—		—			1,745
Equity securities (2)	6,157		—		—		—			6,157
Total	$	7,902	$	46,818	$	31	$	(36,453	)	$	18,298
Liabilities:
Energy commodity derivatives	$	—	$	89,283	$	—	$	(87,199	)	$	2,084
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		2,805		(31		)	2,774
Power exchange agreement	—		—		2,488		—			2,488
Power option agreement	—		—		1		—			1
Foreign currency exchange derivatives	—		45		—		—			45
Interest rate swap derivatives	—		7,831		—		(970		)	6,861
Total	$	—	$	97,159	$	5,294	$	(88,200	)	$	14,253

(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.

(2) These assets are included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.

The difference between the amount of derivative assets and liabilities disclosed in respective levels in the table above and the amount of derivative assets and liabilities disclosed on the Condensed Consolidated Balance Sheets is due to netting arrangements with certain counterparties. See Note 6 for additional discussion of derivative netting.

To establish fair value for energy commodity derivatives, the Company uses quoted market prices and forward price curves to estimate the fair value of energy commodity derivative instruments included in Level 2. In particular, electric derivative valuations are performed using market quotes, adjusted for periods in between quotable periods. Natural gas derivative valuations are estimated using New York Mercantile Exchange pricing for similar instruments, adjusted for basin differences, using market quotes. Where observable inputs are available for substantially the full term of the contract, the derivative asset or liability is included in Level 2.

To establish fair values for interest rate swap derivatives, the Company uses forward market curves for interest rates for the term of the swaps and discounts the cash flows back to present value using an appropriate discount rate. The discount rate is calculated by third party brokers according to the terms of the swap derivatives and evaluated by the Company for reasonableness, with consideration given to the potential non-performance risk by the Company. Future cash flows of the interest rate swap derivatives are equal to the fixed interest rate in the swap compared to the floating market interest rate multiplied by the notional amount for each period.

To establish fair value for foreign currency derivatives, the Company uses forward market curves for Canadian dollars against the US dollar and multiplies the difference between the locked-in price and the market price by the notional amount of the derivative. Forward foreign currency market curves are provided by third party brokers. The Company's credit spread is factored into the locked-in price of the foreign exchange contracts.

Deferred compensation assets and liabilities represent funds held by the Company in a Rabbi Trust for an executive deferral plan. These funds consist of actively traded equity and bond funds with quoted prices in active markets. The balance disclosed in the table above excludes cash and cash equivalents of $0.5 million as of March 31, 2019 and December 31, 2018.

Level 3 Fair Value

Under the power exchange agreement the Company purchases power at a price that is based on the average operating and maintenance (O&M) charges from three surrogate nuclear power plants around the country. To estimate the fair value of this agreement, the Company estimates the difference between the purchase price based on the future O&M charges and forward prices for energy. The Company compares the Level 2 brokered quotes and forward price curves described above to an internally developed forward price which is based on the average O&M charges from the three surrogate nuclear power plants for the current year. The Company estimates the volumes of the transactions that will take place in the future based on historical average transaction volumes per delivery year (November to April). Significant increases or decreases in any of these inputs in isolation would result in a significantly higher or lower fair value measurement.

For the natural gas commodity exchange agreement, the Company uses the same Level 2 brokered quotes described above; however, the Company also estimates the purchase and sales volumes (within contractual limits) as well as the timing of those transactions. Changing the timing of volume estimates changes the timing of purchases and sales, impacting which brokered quote is used. Because the brokered quotes can vary significantly from period to period, the unobservable estimates of the timing and volume of transactions can have a significant impact on the calculated fair value. The Company currently estimates volumes and timing of transactions based on a most likely scenario using historical data. Historically, the timing and volume of transactions have not been highly correlated with market prices and market volatility.

The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of March 31, 2019 (dollars in thousands):

	Fair Value (Net) at
	March 31, 2019			Valuation Technique	Unobservable Input	Range
Power exchange agreement	$	(612	)	Surrogate facility pricing	O&M charges	$40.05-$52.59/MWh (1)
					Transaction volumes	28,860 MWhs
Natural gas exchange agreement	$	(2,104	)	Internally derived weighted average cost of gas	Forward purchase prices	$1.70 - $2.98/mmBTU
					Forward sales prices	$1.63 - $4.11/mmBTU
					Purchase volumes	270,000 - 310,000 mmBTUs
					Sales volumes	60,000 - 310,000 mmBTUs

(1) The average O&M charges for the delivery year beginning in November 2018 are $45.61 per MWh.

The valuation methods, significant inputs and resulting fair values described above were developed by the Company's management and are reviewed on at least a quarterly basis to ensure they provide a reasonable estimate of fair value each reporting period.

The following table presents activity for energy commodity derivative assets (liabilities) measured at fair value using significant unobservable inputs (Level 3) for the three months ended March 31 (dollars in thousands):

	Natural Gas Exchange Agreement			Power Exchange Agreement			Total
Three months ended March 31, 2019:
Balance as of January 1, 2019	$	(2,774	)	$	(2,488	)	$	(5,262	)
Total gains or (losses) (realized/unrealized):
Included in regulatory assets/liabilities (1)	8,977			(1,018		)	7,959
Settlements	(8,307		)	2,894			(5,413		)
Ending balance as of March 31, 2019 (2)	$	(2,104	)	$	(612	)	$	(2,716	)

	Natural Gas Exchange Agreement			Power Exchange Agreement			Total
Three months ended March 31, 2018:
Balance as of January 1, 2018	$	(3,164	)	$	(13,245	)	$	(16,409	)
Total gains or (losses) (realized/unrealized):
Included in regulatory assets/liabilities (1)	203			(1,877		)	(1,674		)
Settlements	156			4,959			5,115
Ending balance as of March 31, 2018 (2)	$	(2,805	)	$	(10,163	)	$	(12,968	)

(1) All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.

(2) There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.

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Common Stock Common Stock (Notes)

3 Months Ended

Mar. 31, 2019

Stockholders' Equity Note [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

COMMON STOCK

The Company has entered into four separate sales agency agreements under which the sales agents may offer and sell new shares of the Company’s common stock from time to time. No shares were issued under these agreements during the three months endedMarch 31, 2019. These agreements provide for the offering of a maximum of approximately 3.8 million shares, of which approximately 1.1 million remain unissued as of March 31, 2019. Subject to the satisfaction of customary conditions, the Company has the right to increase the maximum number of shares that may be offered under these agreements.

ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,048 and $2,091, respectively	$	7,706	$	7,866

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands).

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components	2019			2018			Affected Line Item in Statement of Income
Amortization of defined benefit pension items
Amortization of net prior service cost	$	(200	)	$	(228	)	(a)
Amortization of net loss	3,661			2,995			(a)
Adjustment due to effects of regulation	(3,258		)	(2,508		)	(a)
	203			259			Total before tax
	(43		)	(55		)	Tax expense
	$	160		$	204		Net of tax

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).

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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Notes)

3 Months Ended

Mar. 31, 2019

Accumulated Other Comprehensive Loss [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

COMMON STOCK

The Company has entered into four separate sales agency agreements under which the sales agents may offer and sell new shares of the Company’s common stock from time to time. No shares were issued under these agreements during the three months endedMarch 31, 2019. These agreements provide for the offering of a maximum of approximately 3.8 million shares, of which approximately 1.1 million remain unissued as of March 31, 2019. Subject to the satisfaction of customary conditions, the Company has the right to increase the maximum number of shares that may be offered under these agreements.

ACCUMULATED OTHER COMPREHENSIVE LOSS

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,048 and $2,091, respectively	$	7,706	$	7,866

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands).

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components	2019			2018			Affected Line Item in Statement of Income
Amortization of defined benefit pension items
Amortization of net prior service cost	$	(200	)	$	(228	)	(a)
Amortization of net loss	3,661			2,995			(a)
Adjustment due to effects of regulation	(3,258		)	(2,508		)	(a)
	203			259			Total before tax
	(43		)	(55		)	Tax expense
	$	160		$	204		Net of tax

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).

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Earnings Per Common Share Attributable To Avista Corporation

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Earnings Per Common Share Attributable To Avista Corporation Shareholders

EARNINGS PER COMMON SHARE ATTRIBUTABLE TO AVISTA CORP. SHAREHOLDERS

The following table presents the computation of basic and diluted earnings per common share attributable to Avista Corp. shareholders for the three months ended March 31 (in thousands, except per share amounts):

	2019		2018
Numerator:
Net income attributable to Avista Corp. shareholders	$	115,794	$	54,890
Denominator:
Weighted-average number of common shares outstanding-basic	65,733		65,639
Effect of dilutive securities:
Performance and restricted stock awards	208		292
Weighted-average number of common shares outstanding-diluted	65,941		65,931
Earnings per common share attributable to Avista Corp. shareholders:
Basic	$	1.76	$	0.84
Diluted	$	1.76	$	0.83

There were no shares excluded from the calculation because they were antidilutive.

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Commitments And Contingencies

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies

COMMITMENTS AND CONTINGENCIES

In the course of its business, the Company becomes involved in various claims, controversies, disputes and other contingent matters, including the items described in this Note. Some of these claims, controversies, disputes and other contingent matters involve litigation or other contested proceedings. For all such matters, the Company intends to vigorously protect and defend its interests and pursue its rights. However, no assurance can be given as to the ultimate outcome of any particular matter because litigation and other contested proceedings are inherently subject to numerous uncertainties. For matters that affect Avista Utilities’ or AEL&P's operations, the Company intends to seek, to the extent appropriate, recovery of incurred costs through the ratemaking process.

Cabinet Gorge Total Dissolved Gas Abatement Plan

Dissolved atmospheric gas levels (referred to as "Total Dissolved Gas" or "TDG") in the Clark Fork River exceed state of Idaho and federal water quality numeric standards downstream of Cabinet Gorge particularly during periods when excess river flows must be diverted over the spillway. Under the terms of the Clark Fork Settlement Agreement (CFSA) as incorporated in Avista Corp.’s FERC license for the Clark Fork Project, Avista Corp. has worked in consultation with agencies, tribes and other stakeholders to address this issue. Under the terms of a gas supersaturation mitigation plan, Avista Corp. is reducing TDG by constructing spill crest modifications on spill gates at the dam. These modifications have been shown to be effective in reducing TDG downstream. TDG monitoring and analysis is ongoing. Under the terms of the mitigation plan, Avista Corp. will continue to work with stakeholders to determine the degree to which TDG abatement reduces future mitigation obligations. The Company has sought, and will continue to seek recovery, through the ratemaking process, of all operating and capitalized costs related to this issue.

Legal Proceedings Related to the Terminated Acquisition by Hydro One

See Note 17 for information regarding the termination of the proposed acquisition of the Company by Hydro One.

In connection with the now terminated acquisition, three lawsuits were filed in the United States District Court for the Eastern District of Washington and were subsequently voluntarily dismissed by the plaintiffs.

One lawsuit was filed in the Superior Court for the State of Washington in and for Spokane County, captioned as follows:

• Fink v. Morris, et al., No. 17203616-6 (filed September 15, 2017, amended complaint filed October 25, 2017).

The complaint generally alleged that the members of the Board of Directors of Avista Corp. breached their fiduciary duties by, among other things, conducting an allegedly inadequate sale process and agreeing to the acquisition at a price that allegedly undervalued Avista Corporation, and that Hydro One Limited, Olympus Holding Corp., and Olympus Corp. aided and abetted those purported breaches of duty. The complaint sought various remedies, including monetary damages, attorneys’ fees and expenses. Subsequent to the termination of the proposed acquisition in January 2019, the complaint was voluntarily dismissed by the plaintiffs.

2015 Washington General Rate Cases

In January 2016, the Company received an order (Order 05) that concluded its electric and natural gas general rate cases that were originally filed with the WUTC in February 2015. New electric and natural gas rates were effective on January 11, 2016.

WUTC Order Denying Industrial Customers of Northwest Utilities / Public Counsel Joint Motion for Clarification, WUTC Staff Motion to Reconsider and WUTC Staff Motion to Reopen Record

In January 2016, the Industrial Customers of Northwest Utilities, the Public Counsel Unit of the Washington State Office of the Attorney General (PC) and the WUTC Staff, which is a separate party in the general rate case proceedings from the WUTC Advisory Staff, filed Motions for Clarification requesting the WUTC to clarify their attrition adjustment and the end result electric revenue amounts. The Motions for Clarification suggested that the electric revenue decrease should have been significantly larger than what was included in Order 05.

In February 2016, the WUTC issued an order (Order 06) denying the Motions summarized above and affirming Order 05, including an $8.1 million decrease in electric base revenue.

PC Petition for Judicial Review

In March 2016, PC filed in Thurston County Superior Court a Petition for Judicial Review of the WUTC's Order 05 and Order 06 described above. In April 2016, this matter was certified for review directly by the Court of Appeals, an intermediate appellate court in the State of Washington.

On August 7, 2018, the Court of Appeals issued a "Published Opinion" (Opinion) which concluded that the WUTC's use of an attrition allowance to calculate Avista Corp.'s rate base violated Washington law. In the Opinion, the Court stated that because the projected additions to rate base in the future were not "used and useful" for service at the time the request for the rate increase was made, they may not lawfully be included in the Company's rate base to justify a rate increase. Accordingly, the Court concluded that the WUTC erred in including an attrition allowance in the calculation of Avista Corp.’s electric and natural gas rate base. The Court noted, however, that the law does not prohibit an attrition allowance in the calculation, for ratemaking purposes, of recoverable operating and maintenance expense. Since the WUTC order provided one lump sum attrition allowance without distinguishing what portion was for rate base and which was for operating and maintenance expenses or other considerations, the Court struck all portions of the attrition allowance attributable to Avista Corp.'s rate base and reversed and remanded the case for the WUTC to recalculate Avista Corp.’s rates without including an attrition allowance in the calculation of rate base. On October 1, 2018, the Court of Appeals terminated its review of this case, remanding it back to the Thurston County Superior Court. On April 17, 2019, the Thurston County Superior Court issued a Remand Order, granting a Joint Motion of Avista Corp., PC and the WUTC to remand the case back to the WUTC. A pre-hearing conference which will set forth the procedural schedule will be held on May 17, 2019.

The total attrition allowance approved by the WUTC in Order 05 and reaffirmed in Order 06 was $35.2 million, with $28.3 million related to electric and $6.9 million related to natural gas. The Company believes the potential amount to return to customers is limited to the 2015 general rate cases because in subsequent Washington general rate cases (specifically those approved in April 2018), the WUTC did not include any attrition allowance on rate base. Even though the Company believes the issue only relates to the 2015 general rate cases, the Company cannot predict the outcome of this matter at this time and cannot estimate how much, if any, of the attrition allowance may be removed from the general rate cases or if other amounts from subsequent general rate cases will be included.

Other Contingencies

In the normal course of business, the Company has various other legal claims and contingent matters outstanding. The Company believes that any ultimate liability arising from these actions will not have a material impact on its financial condition, results of operations or cash flows. It is possible that a change could occur in the Company’s estimates of the probability or amount of a liability being incurred. Such a change, should it occur, could be significant. See "Note 20 of the Notes to Consolidated Financial Statements" in the 2018 Form 10-K for additional discussion regarding other contingencies.

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Information By Business Segments

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Information by Business Segments

INFORMATION BY BUSINESS SEGMENTS

The business segment presentation reflects the basis used by the Company's management to analyze performance and determine the allocation of resources. The Company's management evaluates performance based on income (loss) from operations before income taxes as well as net income (loss) attributable to Avista Corp. shareholders. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Avista Utilities' business is managed based on the total regulated utility operation; therefore, it is considered one segment. AEL&P is a separate reportable business segment, as it has separate financial reports that are reviewed in detail by the Chief Operating Decision Maker and its operations and risks are sufficiently different from Avista Utilities and the other businesses at AERC that it cannot be aggregated with any other operating segments. The Other category, which is not a reportable segment, includes other investments and operations of various subsidiaries, as well as certain other operations of Avista Capital.

The following table presents information for each of the Company’s business segments (dollars in thousands):

	Avista Utilities		Alaska Electric Light and Power Company			Total Utility		Other			Intersegment Eliminations (1)			Total
For the three months ended March 31, 2019:
Operating revenues	$	377,702	$	10,881		$	388,583	$	7,898		$	—		$	396,481
Resource costs	138,712		(1,365		)	137,347		—			—			137,347
Other operating expenses (2)	100,583		3,059			103,642		7,355			—			110,997
Depreciation and amortization	46,507		2,407			48,914		209			—			49,123
Income from operations	60,224		6,513			66,737		334			—			67,071
Interest expense (3)	24,264		1,596			25,860		588			(440		)	26,008
Income taxes	28,544		1,363			29,907		110			—			30,017
Net income attributable to Avista Corp. shareholders	111,901		3,552			115,453		341			—			115,794
Capital expenditures (4)	92,309		1,306			93,615		162			—			93,777
For the three months ended March 31, 2018:
Operating revenues	$	388,754	$	13,663		$	402,417	$	6,944		$	—		$	409,361
Resource costs	151,665		2,953			154,618		—			—			154,618
Other operating expenses (2)	75,139		2,831			77,970		6,824			—			84,794
Depreciation and amortization	43,267		1,466			44,733		181			—			44,914
Income (loss) from operations	88,145		6,122			94,267		(61		)	—			94,206
Interest expense (3)	23,965		894			24,859		335			(165		)	25,029
Income taxes	10,417		1,464			11,881		(1,171		)	—			10,710
Net income (loss) attributable to Avista Corp. shareholders	55,540		3,772			59,312		(4,422		)	—			54,890
Capital expenditures (4)	81,176		641			81,817		214			—			82,031
Total Assets:
As of March 31, 2019: (5)	$	5,524,962	$	275,488		$	5,800,450	$	107,398		$	(17,865	)	$	5,889,983
As of December 31, 2018:	$	5,458,104	$	272,950		$	5,731,054	$	87,050		$	(35,528	)	$	5,782,576

(1) Intersegment eliminations reported as interest expense represent intercompany interest.

(2) Other operating expenses for Avista Utilities for the three months ended March 31, 2019 include merger transaction costs of $19.7 million, which are separately disclosed on the Condensed Consolidated Statements of Income. The three months ended March 31, 2018 include merger transaction costs of $0.7 million, which are also separately disclosed.

(3) Including interest expense to affiliated trusts.

(4) The capital expenditures for the other businesses are included in other investing activities on the Condensed Consolidated Statements of Cash Flows.

(5) The total assets for Other as of March 31, 2019 includes $15.9 million in assets held for sale related to the sale of METALfx. See Note 18 for further discussion.

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Termination of Proposed Acquisition by Hydro One Termination of Proposed Acquisition by Hydro One (Notes)

3 Months Ended

Mar. 31, 2019

Business Acquisition [Line Items]

Business Combination Disclosure [Text Block]

On July 19, 2017, Avista Corp. entered into a Merger Agreement that provided for Avista Corp. to become an indirect, wholly-owned subsidiary of Hydro One, subject to the satisfaction or waiver of specified closing conditions, including approval by regulatory agencies. Hydro One, based in Toronto, is Ontario’s largest electricity transmission and distribution provider.

At the effective time of the acquisition, each share of Avista Corp. common stock issued and outstanding, other than shares of Avista Corp. common stock that are owned by Hydro One and its affiliates, were to be converted automatically into the right to receive an amount in cash equal to $53, without interest.

Denial by Regulatory Commissions

The closing of the acquisition was subject to various conditions, including, among others, receipt of regulatory approval from the WUTC, IPUC, MPSC, OPUC, and the RCA.

Washington - On March 27, 2018, Avista Corp. and Hydro One filed an all-parties (including the WUTC Staff), all-issues settlement agreement with the WUTC recommending approval of the acquisition of the Company by Hydro One. The settlement agreement was subject to WUTC approval.

On December 5, 2018, the Company and Hydro One received a decision from the WUTC, denying the proposed acquisition. On December 17, 2018, the Company and Hydro One filed a petition requesting that the WUTC reconsider its December 5, 2018 order denying approval of the acquisition, together with a petition requesting that the WUTC rehear the matter to accept new evidence. Under Washington State law, the WUTC had 20 days to act on the petition for reconsideration.

On January 8, 2019, the WUTC provided notice of its deemed denial by operation of law of the filed petition to reconsider the denial of approval for the acquisition. The WUTC did not take action on the petition within the required 20 days of its filing so the petition was automatically denied under the state's Administrative Procedure Act. In the same notice, the WUTC also denied the petition for a rehearing on the basis that it does not apply.

Idaho -On April 13, 2018, Avista Corp. and Hydro One filed an all-issues settlement agreement (to which the IPUC Staff was a party) with the IPUC recommending approval of the acquisition of the Company by Hydro One. The settlement agreement was subject to IPUC approval.

On January 3, 2019, the Company and Hydro received a decision from the IPUC, finding that the proposed acquisition was not permitted by Idaho law. Avista Corp. and Hydro One had until January 24, 2019 to file a petition for reconsideration with the IPUC, which they did not file.

Oregon - On May 25, 2018, Avista Corp. and Hydro One filed an all-parties (including the OPUC Staff), all-issues settlement agreement with the OPUC related to the Oregon merger proceeding. The settlement agreement was subject to review and approval by the OPUC.

On January 15, 2019, due to the denial of the acquisition by the WUTC and IPUC, the OPUC issued an order suspending indefinitely the procedural schedule in its merger docket until Hydro One and Avista Corp. informed the OPUC that they had sought a reversal of the denial decisions through appeal or other means that would provide a justiciable issue for the OPUC to address.

Termination of the Merger Agreement

On January 23, 2019, Avista Corp., Hydro One and certain subsidiaries thereof, entered into a Termination Agreement indicating their mutual agreement to terminate the Merger Agreement, effective immediately. Pursuant to the terms of the Termination Agreement, Hydro One paid Avista Corp. a $103 million termination fee on January 24, 2019. The termination fee was used for reimbursing the Company's transaction costs incurred from 2017 to 2019. The balance of the termination fee remaining after payment of 2019 transaction costs and applicable income taxes was used for general corporate purposes and reduced the Company's need for external financing. The 2019 costs totaled $19.7 million pre-tax and included financial advisers' fees, legal fees, consulting fees and employee time.

Other Information Related to the Terminated Acquisition

Due to the termination of the acquisition, all the financial commitments that were included in the various settlement agreements with the commissions for the proposed acquisition will not be required to be performed or observed.

The Company incurred significant transaction costs consisting primarily of consulting, banking fees, legal fees and employee time, and these costs are not being passed through to customers. When the Company was assuming the transaction was going to be completed, a significant portion of these costs were not deductible for income tax purposes. Now that the transaction has been terminated, the Company expects more of the previously incurred transaction costs to be deductible so it expects additional tax benefits from these costs in 2019.

See Note 15 for discussion of shareholder lawsuits filed against the Company, the Company’s directors, Hydro One, Olympus Holding Corp., and Olympus Corp. in relation to the Merger Agreement and the proposed acquisition.

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Assets Held for Sale Assets Held for Sale (Notes)

3 Months Ended

Mar. 31, 2019

Assets Held for Sale [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

ASSETS HELD FOR SALE

In April 2019, Bay Area Manufacturing, Inc., a non-regulated subsidiary of Avista Corp., entered into a definitive agreement to sell its interest in METALfx to an independent third party. The transaction is a stock sale for a total cash purchase price of $17.5 million plus cash on-hand, subject to customary closing adjustments. The transaction closed on April 18, 2019, and as of that date the Company has no further involvement with METALfx.

The purchase price of $17.5 million, as adjusted, was divided among the security holders of METALfx, including the minority shareholder, pro rata based on ownership (Avista Corp. owned 89.2 percent of the equity of METALfx). $1.2 million (7 percent of the purchase price) will be held in escrow for 24 months from the closing of the transaction to satisfy certain indemnification obligations under the purchase agreement.

When all escrow amounts are released, based on preliminary estimates, the sales transaction is expected to provide cash proceeds to Avista Corp., net of payments to the minority holder, contractually obligated compensation payments and other transaction expenses, of $16.6 million and result in a net gain after-tax of $2.4 million. The Company expects to receive the full amount of its portion of the escrow accounts; therefore, the full amounts are included in the gain calculation.

Prior to the completion of the sales transaction, METALfx was not a reportable business segment and was included in other in the business segment footnote at Note 16. As of March 31, 2019, the assets of METALfx met the criteria for held for sale presentation; however, this transaction does not meet the criteria for discontinued operations as it does not represent a strategic shift that will have a major effect on the Company's ongoing operations. The Company elected to present the required held for sale information below, rather than modifying the Condensed Consolidated Balance Sheet. The major classes of assets and liabilities that were held for sale as of March 31, 2019 were as follows (dollars in thousands):

	March 31, 2019
Assets:
Current Assets:
Cash and cash equivalents	$	1,026
Accounts and notes receivable-less allowances of $5	3,048
Materials and supplies	2,922
Other current assets	159
Total current assets	7,155
Goodwill	5,247
Deferred income taxes (1)	1,598
Other property and investments-net and other non-current assets	1,874
Total assets	$	15,874
Liabilities:
Current Liabilities:
Accounts payable	$	760
Other current liabilities	901
Total current liabilities	1,661
Other non-current liabilities	152
Total liabilities	$	1,813

(1) On a standalone basis, METALfx has a deferred tax asset; however, on a consolidated basis, Avista Corp. has a net deferred tax liability which does not include the deferred tax asset above.

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Summary Of Significant Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Nature Of Business

Nature of Business

Avista Corp. is primarily an electric and natural gas utility with certain other business ventures. Avista Utilities is an operating division of Avista Corp., comprising its regulated utility operations in the Pacific Northwest. Avista Utilities provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho. Avista Utilities also provides natural gas distribution service in parts of northeastern and southwestern Oregon. Avista Utilities has electric generating facilities in Washington, Idaho, Oregon and Montana. Avista Utilities also supplies electricity to a small number of customers in Montana, most of whom are employees who operate the Company's Noxon Rapids generating facility.

AERC is a wholly-owned subsidiary of Avista Corp. The primary subsidiary of AERC is AEL&P, which comprises Avista Corp.'s regulated utility operations in Alaska.

Avista Capital, a wholly owned non-regulated subsidiary of Avista Corp., is the parent company of all of the subsidiary companies in the non-utility businesses, with the exception of AJT Mining Properties, Inc., which is a subsidiary of AERC. See Note 16 for business segment information. See Note 18 for discussion of assets held for sale at METALfx, an unregulated subsidiary of the Company.

Basis Of Reporting

Basis of Reporting

The condensed consolidated financial statements include the assets, liabilities, revenues and expenses of the Company and its subsidiaries and other majority owned subsidiaries and variable interest entities for which the Company or its subsidiaries are the primary beneficiaries. Intercompany balances were eliminated in consolidation. The accompanying condensed consolidated financial statements include the Company’s proportionate share of utility plant and related operations resulting from its interests in jointly owned plants.

Derivative Assets And Liabilities

Derivative Assets and Liabilities

Derivatives are recorded as either assets or liabilities on the Condensed Consolidated Balance Sheets measured at estimated fair value.

The WUTC and the IPUC issued accounting orders authorizing Avista Corp. to offset energy commodity derivative assets or liabilities with a regulatory asset or liability. This accounting treatment is intended to defer the recognition of mark-to-market gains and losses on energy commodity transactions until the period of delivery. Realized benefits and costs result in adjustments to retail rates through PGAs, the ERM in Washington, the PCA mechanism in Idaho, and periodic general rate cases. The resulting regulatory assets associated with energy commodity derivative instruments have been concluded to be probable of recovery through future rates.

Substantially all forward contracts to purchase or sell power and natural gas are recorded as derivative assets or liabilities at estimated fair value with an offsetting regulatory asset or liability. Contracts that are not considered derivatives are accounted for on the accrual basis until they are settled or realized unless there is a decline in the fair value of the contract that is determined to be other-than-temporary.

For interest rate swap derivatives, Avista Corp. records all mark-to-market gains and losses in each accounting period as assets and liabilities, as well as offsetting regulatory assets and liabilities, such that there is no income statement impact. The interest rate swap derivatives are risk management tools similar to energy commodity derivatives. Upon settlement of interest rate swap derivatives, the regulatory asset or liability is amortized as a component of interest expense over the term of the associated debt. The Company records an offset of interest rate swap derivative assets and liabilities with regulatory assets and liabilities, based on the prior practice of the commissions to provide recovery through the ratemaking process.

The Company has multiple master netting agreements with a variety of entities that allow for cross-commodity netting of derivative agreements with the same counterparty (i.e. power derivatives can be netted with natural gas derivatives). In addition, some master netting agreements allow for the netting of commodity derivatives and interest rate swap derivatives for the same counterparty. The Company does not have any agreements which allow for cross-affiliate netting among multiple affiliated legal entities. The Company nets all derivative instruments when allowed by the agreement for presentation in the Condensed Consolidated Balance Sheets.

Fair Value Measurements

Fair Value Measurements

Fair value represents the price that would be received when selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Energy commodity derivative assets and liabilities, deferred compensation assets, as well as derivatives related to interest rate swaps and foreign currency exchange contracts, are reported at estimated fair value on the Condensed Consolidated Balance Sheets. See Note 11 for the Company’s fair value disclosures.

Contingencies

Contingencies

The Company has unresolved regulatory, legal and tax issues which have inherently uncertain outcomes. The Company accrues a loss contingency if it is probable that a liability has been incurred and the amount of the loss or impairment can be reasonably estimated. The Company also discloses loss contingencies that do not meet these conditions for accrual if there is a reasonable possibility that a material loss may be incurred. As of March 31, 2019, the Company has not recorded any significant amounts related to unresolved contingencies. See Note 15 for further discussion of the Company's commitments and contingencies.

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Balance Sheet Components Balance Sheet Components (Policies)

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Inventory, Policy [Policy Text Block]

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Materials and supplies	$	47,705	$	47,403
Fuel stock	4,930		4,869
Stored natural gas	8,719		11,609
Total	$	61,354	$	63,881

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Revenue Revenue (Policies)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenue Recognition, Policy [Policy Text Block]

Utility Revenues

Revenue from Contracts with Customers

General

The majority of Avista Corp.’s revenue is from rate-regulated sales of electricity and natural gas to retail customers, which has two performance obligations, (1) having service available for a specified period (typically a month at a time) and (2) the delivery of energy to customers. The total energy price generally has a fixed component (basic charge) related to having service available and a usage-based component, related to the delivery and consumption of energy. The commodity is sold and/or delivered to and consumed by the customer simultaneously, and the provisions of the relevant utility commission authorization determine the charges the Company may bill the customer. Given that all revenue recognition criteria are met upon the delivery of energy to customers, revenue is recognized immediately at that time.

Revenues from contracts with customers are presented in the Condensed Consolidated Statements of Income in the line item "Utility revenues, exclusive of alternative revenue programs."

Non-Derivative Wholesale Contracts

The Company has certain wholesale contracts which are not accounted for as derivatives and, accordingly, are within the scope of ASC 606 and considered revenue from contracts with customers. Revenue is recognized as energy is delivered to the customer or the service is available for a specified period of time, consistent with the discussion of rate-regulated sales above.

Alternative Revenue Programs (Decoupling)

ASC 606 retained existing GAAP associated with alternative revenue programs, which specified that alternative revenue programs are contracts between an entity and a regulator of utilities, not a contract between an entity and a customer. GAAP requires that an entity present revenue arising from alternative revenue programs separately from revenues arising from contracts with customers on the face of the Condensed Consolidated Statements of Income. The Company's decoupling mechanisms (also known as a FCA in Idaho) qualify as alternative revenue programs. Decoupling revenue deferrals are recognized in the Condensed Consolidated Statements of Income during the period they occur (i.e. during the period of revenue shortfall or excess due to fluctuations in customer usage), subject to certain limitations, and a regulatory asset or liability is established that will be surcharged or rebated to customers in future periods. GAAP requires that for any alternative revenue program, like decoupling, the revenue must be expected to be collected from customers within 24 months of the deferral to qualify for recognition in the current period Condensed Consolidated Statement of Income. Any amounts included in the Company's decoupling program that are not expected to be collected from customers within 24 months are not recorded in the financial statements until the period in which revenue recognition criteria are met. The amounts expected to be collected from customers within 24 months represents an estimate that must be made by the Company on an ongoing basis due to it being based on the volumes of electric and natural gas sold to customers on a go-forward basis.

Derivative Revenue

Most wholesale electric and natural gas transactions (including both physical and financial transactions), and the sale of fuel are considered derivatives, which are specifically scoped out of ASC 606. As such, these revenues are disclosed separately from revenue from contracts with customers. Revenue is recognized for these items upon the settlement/expiration of the derivative contract. Derivative revenue includes those transactions that are entered into and settled within the same month.

Other Utility Revenue

Other utility revenue includes rent, revenues from the lineman training school, sales of materials, late fees and other charges that do not represent contracts with customers.Other utility revenue also includes the provision for earnings sharing and the deferral and amortization of refunds to customers associated with the TCJA. This revenue is scoped out of ASC 606, as this revenue does not represent items where a customer is a party that has contracted with the Company to obtain goods or services that are an output of the Company’s ordinary activities in exchange for consideration. As such, these revenues are presented separately from revenue from contracts with customers.

Other Considerations for Utility Revenues

Gross Versus Net Presentation

Revenues and resource costs from Avista Utilities’ settled energy contracts that are “booked out” (not physically delivered) are reported on a net basis as part of derivative revenues.

Utility-related taxes collected from customers (primarily state excise taxes and city utility taxes) are taxes that are imposed on Avista Utilities as opposed to being imposed on its customers; therefore, Avista Utilities is the taxpayer and records these transactions on a gross basis in revenue from contracts with customers and operating expense (taxes other than income taxes). The utility-related taxes collected from customers at AEL&P are imposed on the customers rather than AEL&P; therefore, the customers are the taxpayers and AEL&P is acting as their agent. As such, these transactions at AEL&P are presented on a net basis within revenue from contracts with customers.

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2019		2018
Utility-related taxes	$	19,089	$	19,167

Non-Utility Revenues

Revenue from Contracts with Customers

Non-utility revenues from contracts with customers are primarily derived from the operations of METALfx. The contracts associated with METALfx have one performance obligation, the delivery of a product, and revenues are recognized when the risk of loss transfers to the customer, which occurs when products are shipped.

Significant Judgments and Unsatisfied Performance Obligations

The only significant judgments involving revenue recognition are estimates surrounding unbilled revenue and receivables from contracts with customers and estimates surrounding the amount of decoupling revenues that will be collected from customers within 24 months (discussed above).

The Company has certain capacity arrangements, where the Company has a contractual obligation to provide either electric or natural gas capacity to its customers for a fixed fee. Most of these arrangements are paid for in arrears by the customers and do not result in deferred revenue and only result in receivables from the customers. The Company does have one capacity agreement where the customer makes payments throughout the year and depending on the timing of the customer payments, it can result in an immaterial amount of deferred revenue or a receivable from the customer. As of March 31, 2019, the Company estimates it had unsatisfied capacity performance obligations of $9.1 million, which will be recognized as revenue in future periods as the capacity is provided to the customers. These performance obligations are not reflected in the financial statements, as the Company has not received payment for these services.

Revenue Recognition for Alternative Revenue Programs, Policy [Policy Text Block]

Alternative Revenue Programs (Decoupling)

ASC 606 retained existing GAAP associated with alternative revenue programs, which specified that alternative revenue programs are contracts between an entity and a regulator of utilities, not a contract between an entity and a customer. GAAP requires that an entity present revenue arising from alternative revenue programs separately from revenues arising from contracts with customers on the face of the Condensed Consolidated Statements of Income. The Company's decoupling mechanisms (also known as a FCA in Idaho) qualify as alternative revenue programs. Decoupling revenue deferrals are recognized in the Condensed Consolidated Statements of Income during the period they occur (i.e. during the period of revenue shortfall or excess due to fluctuations in customer usage), subject to certain limitations, and a regulatory asset or liability is established that will be surcharged or rebated to customers in future periods. GAAP requires that for any alternative revenue program, like decoupling, the revenue must be expected to be collected from customers within 24 months of the deferral to qualify for recognition in the current period Condensed Consolidated Statement of Income. Any amounts included in the Company's decoupling program that are not expected to be collected from customers within 24 months are not recorded in the financial statements until the period in which revenue recognition criteria are met. The amounts expected to be collected from customers within 24 months represents an estimate that must be made by the Company on an ongoing basis due to it being based on the volumes of electric and natural gas sold to customers on a go-forward basis.

Utility, Revenue and Expense Recognition, Policy [Policy Text Block]

Utility-related taxes collected from customers (primarily state excise taxes and city utility taxes) are taxes that are imposed on Avista Utilities as opposed to being imposed on its customers; therefore, Avista Utilities is the taxpayer and records these transactions on a gross basis in revenue from contracts with customers and operating expense (taxes other than income taxes). The utility-related taxes collected from customers at AEL&P are imposed on the customers rather than AEL&P; therefore, the customers are the taxpayers and AEL&P is acting as their agent. As such, these transactions at AEL&P are presented on a net basis within revenue from contracts with customers.

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2019		2018
Utility-related taxes	$	19,089	$	19,167

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Balance Sheet Components Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of Other Current Assets [Table Text Block]

Other current assets consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$	37,347	$	26,809
Prepayments	16,647		17,536
Other	6,954		9,665
Total	$	60,948	$	54,010

Schedule of Inventory, Current [Table Text Block]

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Materials and supplies	$	47,705	$	47,403
Fuel stock	4,930		4,869
Stored natural gas	8,719		11,609
Total	$	61,354	$	63,881

Public Utility Property, Plant, and Equipment [Table Text Block]

Net utility property consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Utility plant in service	$	6,202,942	$	6,209,968
Construction work in progress	165,725		160,598
Total	6,368,667		6,370,566
Less: Accumulated depreciation and amortization	1,742,613		1,721,636
Total net utility property	$	4,626,054	$	4,648,930

Schedule of Other Current Assets [Table Text Block]

Other property and investments-net and other non-current assets consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Operating lease ROU assets	$	70,834	$	—
Finance lease ROU assets	53,711		—
Non-utility property	29,557		31,355
Equity investments	32,967		29,257
Investment in affiliated trust	11,547		11,547
Notes receivable	11,161		11,073
Deferred compensation assets	8,675		8,400
Other	22,751		23,065
Total	$	241,203	$	114,697

Other Current Liabilities [Table Text Block]

Other current liabilities consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Accrued taxes other than income taxes	$	49,206	$	36,858
Income taxes payable	20,368		141
Employee paid time off accruals	21,813		20,992
Accrued interest	30,315		16,704
Current portion of pensions and other postretirement benefits	9,503		9,151
Operating lease liabilities	4,120		—
Finance lease liabilities	2,695		—
Utility energy commodity derivative liabilities	4,035		3,908
Other current liabilities	33,399		32,604
Total other current liabilities	$	175,454	$	120,358

Other Noncurrent Liabilities [Table Text Block]

Other non-current liabilities and deferred credits consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Operating lease liabilities	$	67,635	$	—
Finance lease liabilities	53,850		—
Deferred investment tax credits	31,383		29,725
Asset retirement obligations	18,455		18,266
Derivative liabilities	10,861		10,300
Other	13,564		12,740
Total	$	195,748	$	71,031

Schedule Of Regulated Asset And Liability [Table Text Block]

Regulatory assets and liabilities consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	28,159	$	11,862	$	41,428	$	16,866
Decoupling surcharge	6,782		8,395		3,408		17,501
Pension and other postretirement benefit plans	—		224,805		—		228,062
Interest rate swaps	—		138,327		—		133,854
Deferred income taxes	—		93,646		—		91,188
Settlement with Coeur d'Alene Tribe	—		42,316		—		42,643
Demand side management programs	—		15,064		—		19,674
Utility plant to be abandoned	—		24,477		—		24,334
Other regulatory assets	6,625		46,605		3,716		40,232
Total regulatory assets	$	41,566	$	605,497	$	48,552	$	614,354
Regulatory Liabilities
Income tax related liabilities	$	29,401	$	421,216	$	27,997	$	425,613
Deferred natural gas costs	1,253		—		40,713		—
Deferral power costs	12,555		26,106		25,072		16,933
Decoupling rebate	1,061		4,664		6,782		204
Utility plant retirement costs	—		300,373		—		297,379
Interest rate swaps	—		20,396		—		28,078
Other regulatory liabilities	11,194		13,478		12,645		12,494
Total regulatory liabilities	$	55,464	$	786,233	$	113,209	$	780,701

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Revenue Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

Disaggregation of Total Operating Revenue

The following table disaggregates total operating revenue by segment and source for the three months ended March 31 (dollars in thousands):

	2019			2018
Avista Utilities
Revenue from contracts with customers	$	354,301		$	354,162
Derivative revenues	24,127			58,392
Alternative revenue programs	(4,658		)	(5,939		)
Deferrals and amortizations for rate refunds to customers	2,135			(19,822		)
Other utility revenues	1,797			1,961
Total Avista Utilities	377,702			388,754
AEL&P
Revenue from contracts with customers	10,736			14,650
Deferrals and amortizations for rate refunds to customers	(48		)	(1,122		)
Other utility revenues	193			135
Total AEL&P	10,881			13,663
Other
Revenue from contracts with customers	7,647			6,729
Other revenues	251			215
Total other	7,898			6,944
Total operating revenues	$	396,481		$	409,361

Utility Revenue from Contracts with Customers by Type and Service

The following table disaggregates revenue from contracts with customers associated with the Company's utility operations for the three months ended March 31 (dollars in thousands):

	2019						2018
	Avista Utilities		AEL&P		Total Utility		Avista Utilities		AEL&P		Total Utility
ELECTRIC OPERATIONS
Residential	$	115,392	$	5,852	$	121,244	$	114,753	$	6,538	$	121,291
Commercial and governmental	79,245		4,821		84,066		78,909		8,044		86,953
Industrial	25,248		—		25,248		25,119		—		25,119
Public street and highway lighting	1,903		63		1,966		1,859		68		1,927
Total retail revenue	221,788		10,736		232,524		220,640		14,650		235,290
Transmission	5,152		—		5,152		3,830		—		3,830
Other revenue from contracts with customers	8,194		—		8,194		6,291		—		6,291
Total electric revenue from contracts with customers	$	235,134	$	10,736	$	245,870	$	230,761	$	14,650	$	245,411
NATURAL GAS OPERATIONS
Residential	$	77,336	$	—	$	77,336	$	80,653	$	—	$	80,653
Commercial	36,595		—		36,595		37,373		—		37,373
Industrial and interruptible	1,627		—		1,627		1,683		—		1,683
Total retail revenue	115,558		—		115,558		119,709		—		119,709
Transportation	2,484		—		2,484		2,567		—		2,567
Other revenue from contracts with customers	1,125		—		1,125		1,125		—		1,125
Total natural gas revenue from contracts with customers	$	119,167	$	—	$	119,167	$	123,401	$	—	$	123,401

Schedule Of Utilities Operating Revenue Expense Taxes [Table Text Block]

Utility-related taxes that were included in revenue from contracts with customers were as follows for the three months ended March 31 (dollars in thousands):

	2019		2018
Utility-related taxes	$	19,089	$	19,167

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Leases Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense were as follows for the three months ended March 31 (dollars in thousands):

	2019
Operating lease cost:
Fixed lease cost (Other operating expenses)	$	1,103
Variable lease cost (Other operating expenses)	243
Total operating lease cost	$	1,346
Finance lease cost:
Amortization of ROU asset (Depreciation and amortization)	$	910
Interest on lease liabilities (Interest expense)	699
Total finance lease cost	$	1,609

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Supplemental cash flow information related to leases was as follows for the three months ended March 31 (dollars in thousands):

	2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows:
Operating lease payments	$	4,092
Interest on finance lease	699
Total operating cash outflows	$	4,791
Finance cash outflows:
Principal payments on finance lease	$	665

Supplemental Balance Sheet Information Leases [Table Text Block]

Supplemental balance sheet information related to leases was as follows for March 31, 2019 (dollars in thousands):

	March 31,
	2019
Operating Leases
Operating lease ROU assets (Other property and investments-net and other non-current assets)	$	70,834
Other current liabilities	$	4,120
Other non-current liabilities and deferred credits	67,635
Total operating lease liabilities	$	71,755
Finance Leases
Finance lease ROU assets (Other property and investments-net and other non-current assets) (a)	$	53,711
Other current liabilities (b)	$	2,695
Other non-current liabilities and deferred credits (b)	53,850
Total finance lease liabilities	$	56,545
Weighted Average Remaining Lease Term
Operating leases	27.32 years
Finance leases	9.64 years
Weighted Average Discount Rate
Operating leases	3.82		%
Finance leases	4.85		%

(a) At December 31, 2018, the finance lease ROU assets were included in "Net utility property" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other property and investments-net and other non-current assets" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

(b) At December 31, 2018, the finance lease liabilities were included in "Current portion of long-term debt" and "Long-term debt and capital leases" on the Condensed Consolidated Balance Sheet. Due to the adoption of ASC 842 on January 1, 2019, the Company has reclassified these amounts to "Other current liabilities" and "Other non-current liabilities and deferred credits" on the Condensed Consolidated Balance Sheet such that their presentation as of March 31, 2019 is consistent with operating leases.

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of lease liabilities (including principal and interest) were as follows as of March 31, 2019 (dollars in thousands):

	Operating Leases			Finance Leases
Remainder 2019	$	4,272		$	4,091
2020	4,364			5,462
2021	4,367			5,457
2022	4,375			5,460
2023	4,383			5,456
Thereafter	95,923			54,574
Total lease payments	$	117,684		$	80,500
Less: imputed interest	(45,929		)	(23,955		)
Total	$	71,755		$	56,545

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):

	Operating Leases		Finance Leases
2019	$	4,995	$	5,455
2020	4,876		5,462
2021	4,859		5,457
2022	4,782		5,460
2023	4,780		5,456
Thereafter	102,389		54,574
Total lease payments	$	126,681	$	81,864
Less: imputed interest	—		(24,654		)
Total	$	126,681	$	57,210

Finance Lease, Liability, Maturity [Table Text Block]

Maturities of lease liabilities (including principal and interest) were as follows as of March 31, 2019 (dollars in thousands):

	Operating Leases			Finance Leases
Remainder 2019	$	4,272		$	4,091
2020	4,364			5,462
2021	4,367			5,457
2022	4,375			5,460
2023	4,383			5,456
Thereafter	95,923			54,574
Total lease payments	$	117,684		$	80,500
Less: imputed interest	(45,929		)	(23,955		)
Total	$	71,755		$	56,545

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Future minimum lease payments (including principal and interest) under Topic 840 as of December 31, 2018 (dollars in thousands):

	Operating Leases		Finance Leases
2019	$	4,995	$	5,455
2020	4,876		5,462
2021	4,859		5,457
2022	4,782		5,460
2023	4,780		5,456
Thereafter	102,389		54,574
Total lease payments	$	126,681	$	81,864
Less: imputed interest	—		(24,654		)
Total	$	126,681	$	57,210

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Derivatives And Risk Management (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedges, Assets [Abstract]

Energy Commodity Derivatives

The following table presents the underlying energy commodity derivative volumes as of March 31, 2019 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases				Sales
	Electric Derivatives		Gas Derivatives		Electric Derivatives		Gas Derivatives
Year	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs
Remainder 2019	30	596	4,640	81,438	109	2,280	669	35,913
2020	—	—	1,138	53,388	123	959	1,430	16,378
2021	—	—	—	15,290	—	246	1,049	4,100
2022	—	—	—	—	—	—	—	—
2023	—	—	—	—	—	—	—	—
Thereafter	—	—	—	—	—	—	—	—

The following table presents the underlying energy commodity derivative volumes as of December 31, 2018 that are expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases				Sales
	Electric Derivatives		Gas Derivatives		Electric Derivatives		Gas Derivatives
Year	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs	Physical (1) MWh	Financial (1) MWh	Physical (1) mmBTUs	Financial (1) mmBTUs
2019	206	941	10,732	101,293	197	2,790	2,909	54,418
2020	—	—	1,138	47,225	123	959	1,430	14,625
2021	—	—	—	9,670	—	—	1,049	4,100
2022	—	—	—	—	—	—	—	—
2023	—	—	—	—	—	—	—	—
Thereafter	—	—	—	—	—	—	—	—

Foreign Currency Exchange Contracts

The following table summarizes the foreign currency exchange derivatives that Avista Corp. has outstanding as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Number of contracts	22		31
Notional amount (in United States dollars)	$	6,681	$	4,018
Notional amount (in Canadian dollars)	8,917		5,386

Interest Rate Swap Agreements

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has outstanding as of March 31, 2019 and December 31, 2018 (dollars in thousands):

Balance Sheet Date	Number of Contracts	Notional Amount		Mandatory Cash Settlement Date
March 31, 2019	6	$	70,000	2019
	6	60,000		2020
	2	25,000		2021
	8	90,000		2022
December 31, 2018	6	$	70,000	2019
	6	60,000		2020
	2	25,000		2021
	7	80,000		2022

Derivative Instruments Summary

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of March 31, 2019 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	15	$	(15	)	$	—	$	—
Interest rate swap derivatives
Other current assets	2,587		(530		)	—		2,057
Other property and investments-net and other non-current assets	2,503		(1,754		)	—		749
Other current liabilities	—		(524		)	—		(524		)
Other non-current liabilities and deferred credits	—		(12,402		)	2,860		(9,542		)
Energy commodity derivatives
Other current assets	262		(12		)	—		250
Other current liabilities	26,875		(55,284		)	24,374		(4,035		)
Other non-current liabilities and deferred credits	4,349		(16,211		)	10,543		(1,319		)
Total derivative instruments recorded on the balance sheet	$	36,591	$	(86,732	)	$	37,777	$	(12,364	)

The following table presents the fair values and locations of derivative instruments recorded on the Condensed Consolidated Balance Sheet as of December 31, 2018 (in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netted		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current liabilities	$	—	$	(45	)	$	—	$	(45	)
Interest rate swap derivatives
Other current assets	5,283		—			—		5,283
Other property and investments-net and other non-current assets	5,283		(440		)	—		4,843
Other non-current liabilities and deferred credits	—		(7,391		)	530		(6,861		)
Energy commodity derivatives
Other current assets	400		(130		)	—		270
Other current liabilities	31,457		(73,155		)	37,790		(3,908		)
Other non-current liabilities and deferred credits	4,426		(21,292		)	13,427		(3,439		)
Total derivative instruments recorded on the balance sheet	$	46,849	$	(102,453	)	$	51,747	$	(3,857	)

Schedule of Assets Pledged as Collateral and Related Offsets [Table Text Block]

The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Energy commodity derivatives
Cash collateral posted	$	72,264	$	78,025
Letters of credit outstanding	56,100		6,500
Balance sheet offsetting (cash collateral against net derivative positions)	34,917		51,217
Interest rate swap derivatives
Cash collateral posted	2,860		530
Balance sheet offsetting (cash collateral against net derivative positions)	2,860		530

Certain of Avista Corp.’s derivative instruments contain provisions that require Avista Corp. to maintain an "investment grade" credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below "investment grade," it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31,		December 31,
	2019		2018
Energy commodity derivatives
Liabilities with credit-risk-related contingent features	$	1,406	$	2,193
Additional collateral to post	1,415		2,193
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features	15,210		7,831
Additional collateral to post	10,064		6,579

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Pension Plans And Other Postretirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Components of Net Periodic Benefit Cost

	Pension Benefits						Other Postretirement Benefits
	2019			2018			2019			2018
Service cost (a)	$	4,874		$	5,450		$	772		$	804
Interest cost	7,138			6,466			1,372			1,197
Expected return on plan assets	(7,815		)	(8,250		)	(718		)	(500		)
Amortization of prior service cost	75			75			(275		)	(815		)
Net loss recognition	2,415			2,088			1,246			1,655
Net periodic benefit cost	$	6,687		$	5,829		$	2,397		$	2,341

(a) Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 40 percent of all labor and benefits is capitalized to utility property and 60 percent is expensed to utility other operating expenses.

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Income Taxes Income Taxes (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three months ended March 31 (dollars in thousands):

	2019					2018
Federal income taxes at statutory rates	$	30,639		21.0	%	$	13,790		21.0	%
Increase (decrease) in tax resulting from:
Tax effect of regulatory treatment of utility plant differences	(2,080		)	(1.4	)	(1,018		)	(1.6	)
State income tax expense	1,659			1.1		964			1.5
Acquisition costs	(1,824		)	(1.2	)	46			0.1
Settlement of equity awards	612			0.4		(990		)	(1.5	)
Other	1,011			0.7		(2,082		)	(3.2	)
Total income tax expense	$	30,017		20.6	%	$	10,710		16.3	%

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Committed Lines of Credit (Tables)

3 Months Ended

Mar. 31, 2019

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities [Table Text Block]

outstanding and interest rates of borrowings (excluding letters of credit) under the Company’s revolving committed line of credit were as follows as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,			December 31,
	2019			2018
Balance outstanding at end of period (1)	$	119,000		$	190,000
Letters of credit outstanding at end of period	$	60,103		$	10,503
Average interest rate at end of period	3.31		%	3.18		%

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Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Tables)

3 Months Ended

Mar. 31, 2019

Long-Term Debt to Affiliated Trust [Abstract]

Schedule Of Distribution Rates Paid [Table Text Block]

The distribution rates paid were as follows during the three months ended March 31, 2019 and the year ended December 31, 2018:

	March 31,		December 31,
	2019		2018
Low distribution rate	3.50	%	2.36	%
High distribution rate	3.61	%	3.61	%
Distribution rate at the end of the period	3.50	%	3.61	%

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block]

The following table presents the quantitative information which was used to estimate the fair values of the Level 3 assets and liabilities above as of March 31, 2019 (dollars in thousands):

	Fair Value (Net) at
	March 31, 2019			Valuation Technique	Unobservable Input	Range
Power exchange agreement	$	(612	)	Surrogate facility pricing	O&M charges	$40.05-$52.59/MWh (1)
					Transaction volumes	28,860 MWhs
Natural gas exchange agreement	$	(2,104	)	Internally derived weighted average cost of gas	Forward purchase prices	$1.70 - $2.98/mmBTU
					Forward sales prices	$1.63 - $4.11/mmBTU
					Purchase volumes	270,000 - 310,000 mmBTUs
					Sales volumes	60,000 - 310,000 mmBTUs

Fair Value of Assets And Liabilities Measured on Recurring Basis

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
March 31, 2019
Assets:
Energy commodity derivatives	$	—	$	31,363	$	—	$	(31,113	)	$	250
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		123		(123		)	—
Foreign currency exchange derivatives	—		15		—		(15		)	—
Interest rate swap derivatives	—		5,090		—		(2,284		)	2,806
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)	1,758		—		—		—			1,758
Equity securities (2)	6,456		—		—		—			6,456
Total	$	8,214	$	36,468	$	123	$	(33,535	)	$	11,270
Liabilities:
Energy commodity derivatives	$	—	$	68,668	$	—	$	(66,030	)	$	2,638
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		2,227		(123		)	2,104
Power exchange agreement	—		—		612		—			612
Foreign currency exchange derivatives	—		15		—		(15		)	—
Interest rate swap derivatives	—		15,210		—		(5,144		)	10,066
Total	$	—	$	83,893	$	2,839	$	(71,312	)	$	15,420

	Level 1		Level 2		Level 3		Counterparty and Cash Collateral Netting (1)			Total
December 31, 2018
Assets:
Energy commodity derivatives	$	—	$	36,252	$	—	$	(35,982	)	$	270
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		31		(31		)	—
Interest rate swap derivatives	—		10,566		—		(440		)	10,126
Deferred compensation assets:
Mutual Funds:
Fixed income securities (2)	1,745		—		—		—			1,745
Equity securities (2)	6,157		—		—		—			6,157
Total	$	7,902	$	46,818	$	31	$	(36,453	)	$	18,298
Liabilities:
Energy commodity derivatives	$	—	$	89,283	$	—	$	(87,199	)	$	2,084
Level 3 energy commodity derivatives:
Natural gas exchange agreement	—		—		2,805		(31		)	2,774
Power exchange agreement	—		—		2,488		—			2,488
Power option agreement	—		—		1		—			1
Foreign currency exchange derivatives	—		45		—		—			45
Interest rate swap derivatives	—		7,831		—		(970		)	6,861
Total	$	—	$	97,159	$	5,294	$	(88,200	)	$	14,253

(1) The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.

(2) These assets are included in other property and investments-net and other non-current assets on the Condensed Consolidated Balance Sheets.

Reconciliation for All Assets Measured At Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)

	Natural Gas Exchange Agreement			Power Exchange Agreement			Total
Three months ended March 31, 2019:
Balance as of January 1, 2019	$	(2,774	)	$	(2,488	)	$	(5,262	)
Total gains or (losses) (realized/unrealized):
Included in regulatory assets/liabilities (1)	8,977			(1,018		)	7,959
Settlements	(8,307		)	2,894			(5,413		)
Ending balance as of March 31, 2019 (2)	$	(2,104	)	$	(612	)	$	(2,716	)

	Natural Gas Exchange Agreement			Power Exchange Agreement			Total
Three months ended March 31, 2018:
Balance as of January 1, 2018	$	(3,164	)	$	(13,245	)	$	(16,409	)
Total gains or (losses) (realized/unrealized):
Included in regulatory assets/liabilities (1)	203			(1,877		)	(1,674		)
Settlements	156			4,959			5,115
Ending balance as of March 31, 2018 (2)	$	(2,805	)	$	(10,163	)	$	(12,968	)

(1) All gains and losses are included in other regulatory assets and liabilities. There were no gains and losses included in either net income or other comprehensive income during any of the periods presented in the table above.

(2) There were no purchases, issuances or transfers from other categories of any derivatives instruments during the periods presented in the table above.

Carrying Value and Estimated Fair Value of Financial Instruments

The following table sets forth the carrying value and estimated fair value of the Company’s financial instruments not reported at estimated fair value on the Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31, 2019				December 31, 2018
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Long-term debt (Level 2)	$	1,053,500	$	1,155,199	$	1,053,500	$	1,142,292
Long-term debt (Level 3)	767,000		734,742		767,000		734,742
Snettisham finance lease obligation (Level 3)	56,545		56,900		57,210		55,600
Long-term debt to affiliated trusts (Level 3)	51,547		38,145		51,547		38,145

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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2019

Accumulated Other Comprehensive Loss [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Accumulated other comprehensive loss, net of tax, consisted of the following as of March 31, 2019 and December 31, 2018 (dollars in thousands):

	March 31,		December 31,
	2019		2018
Unfunded benefit obligation for pensions and other postretirement benefit plans - net of taxes of $2,048 and $2,091, respectively	$	7,706	$	7,866

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

The following table details the reclassifications out of accumulated other comprehensive loss to net income by component for the three months ended March 31 (dollars in thousands).

	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Loss Components	2019			2018			Affected Line Item in Statement of Income
Amortization of defined benefit pension items
Amortization of net prior service cost	$	(200	)	$	(228	)	(a)
Amortization of net loss	3,661			2,995			(a)
Adjustment due to effects of regulation	(3,258		)	(2,508		)	(a)
	203			259			Total before tax
	(43		)	(55		)	Tax expense
	$	160		$	204		Net of tax

(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 7 for additional details).

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Earnings Per Common Share Attributable To Avista Corporation (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Computations Of Earnings Per Share

The following table presents the computation of basic and diluted earnings per common share attributable to Avista Corp. shareholders for the three months ended March 31 (in thousands, except per share amounts):

	2019		2018
Numerator:
Net income attributable to Avista Corp. shareholders	$	115,794	$	54,890
Denominator:
Weighted-average number of common shares outstanding-basic	65,733		65,639
Effect of dilutive securities:
Performance and restricted stock awards	208		292
Weighted-average number of common shares outstanding-diluted	65,941		65,931
Earnings per common share attributable to Avista Corp. shareholders:
Basic	$	1.76	$	0.84
Diluted	$	1.76	$	0.83

There were no shares excluded from the calculation because they were antidilutive.

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Information By Business Segments (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Information by Business Segments

The following table presents information for each of the Company’s business segments (dollars in thousands):

	Avista Utilities		Alaska Electric Light and Power Company			Total Utility		Other			Intersegment Eliminations (1)			Total
For the three months ended March 31, 2019:
Operating revenues	$	377,702	$	10,881		$	388,583	$	7,898		$	—		$	396,481
Resource costs	138,712		(1,365		)	137,347		—			—			137,347
Other operating expenses (2)	100,583		3,059			103,642		7,355			—			110,997
Depreciation and amortization	46,507		2,407			48,914		209			—			49,123
Income from operations	60,224		6,513			66,737		334			—			67,071
Interest expense (3)	24,264		1,596			25,860		588			(440		)	26,008
Income taxes	28,544		1,363			29,907		110			—			30,017
Net income attributable to Avista Corp. shareholders	111,901		3,552			115,453		341			—			115,794
Capital expenditures (4)	92,309		1,306			93,615		162			—			93,777
For the three months ended March 31, 2018:
Operating revenues	$	388,754	$	13,663		$	402,417	$	6,944		$	—		$	409,361
Resource costs	151,665		2,953			154,618		—			—			154,618
Other operating expenses (2)	75,139		2,831			77,970		6,824			—			84,794
Depreciation and amortization	43,267		1,466			44,733		181			—			44,914
Income (loss) from operations	88,145		6,122			94,267		(61		)	—			94,206
Interest expense (3)	23,965		894			24,859		335			(165		)	25,029
Income taxes	10,417		1,464			11,881		(1,171		)	—			10,710
Net income (loss) attributable to Avista Corp. shareholders	55,540		3,772			59,312		(4,422		)	—			54,890
Capital expenditures (4)	81,176		641			81,817		214			—			82,031
Total Assets:
As of March 31, 2019: (5)	$	5,524,962	$	275,488		$	5,800,450	$	107,398		$	(17,865	)	$	5,889,983
As of December 31, 2018:	$	5,458,104	$	272,950		$	5,731,054	$	87,050		$	(35,528	)	$	5,782,576

(1) Intersegment eliminations reported as interest expense represent intercompany interest.

(2) Other operating expenses for Avista Utilities for the three months ended March 31, 2019 include merger transaction costs of $19.7 million, which are separately disclosed on the Condensed Consolidated Statements of Income. The three months ended March 31, 2018 include merger transaction costs of $0.7 million, which are also separately disclosed.

(3) Including interest expense to affiliated trusts.

(4) The capital expenditures for the other businesses are included in other investing activities on the Condensed Consolidated Statements of Cash Flows.

(5) The total assets for Other as of March 31, 2019 includes $15.9 million in assets held for sale related to the sale of METALfx. See Note 18 for further discussion.

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Assets Held for Sale Assets Held for Sale (Tables)

3 Months Ended

Mar. 31, 2019

Assets Held for Sale [Abstract]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The major classes of assets and liabilities that were held for sale as of March 31, 2019 were as follows (dollars in thousands):

	March 31, 2019
Assets:
Current Assets:
Cash and cash equivalents	$	1,026
Accounts and notes receivable-less allowances of $5	3,048
Materials and supplies	2,922
Other current assets	159
Total current assets	7,155
Goodwill	5,247
Deferred income taxes (1)	1,598
Other property and investments-net and other non-current assets	1,874
Total assets	$	15,874
Liabilities:
Current Liabilities:
Accounts payable	$	760
Other current liabilities	901
Total current liabilities	1,661
Other non-current liabilities	152
Total liabilities	$	1,813

(1) On a standalone basis, METALfx has a deferred tax asset; however, on a consolidated basis, Avista Corp. has a net deferred tax liability which does not include the deferred tax asset above.

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New Accounting Standards New Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Document Period End Date	Mar. 31, 2019
AOCI Attributable to Parent [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of excess income tax benefits	$ 0	$ (1,742)

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Balance Sheet Components Materials and Supplies, Fuel Stock and Stored Natural Gas (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Inventory, Raw Materials and Supplies, Gross	$ 47,705	$ 47,403
Other Inventory, Gross	4,930	4,869
Energy Related Inventory, Gas Stored Underground	8,719	11,609
Inventory, Net	$ 61,354	$ 63,881

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Balance Sheet Components Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$ 37,347	$ 26,809
Prepayments	16,647	17,536
Other	6,954	9,665
Other Assets, Current	$ 60,948	$ 54,010

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Balance Sheet Components Net Utility Property (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Utility plant in service	$ 6,202,942	$ 6,209,968
Construction work in progress	165,725	160,598
Total	6,368,667	6,370,566
Less: Accumulated depreciation and amortization	1,742,613	1,721,636
Total net utility property	$ 4,626,054	$ 4,648,930

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Balance Sheet Components Other Property and Investments-Net and Non-current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Operating Lease, Right-of-Use Asset	$ 70,834	$ 0
Finance Lease, Right-of-Use Asset	53,711	0
Non-utility property	29,557	31,355
Equity investments	32,967	29,257
Investment in affiliated trust	11,547	11,547
Notes receivable	11,161	11,073
Deferred compensation assets	8,675	8,400
Other	22,751	23,065
Investments and Other Noncurrent Assets	$ 241,203	$ 114,697

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Balance Sheet Components Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Accrued taxes other than income taxes	$ 49,206	$ 36,858
Income taxes payable	20,368	141
Employee paid time off accruals	21,813	20,992
Accrued interest	30,315	16,704
Current portion of pensions and other postretirement benefits	9,503	9,151
Operating Lease, Liability, Current	4,120	0
Finance Lease, Liability, Current	2,695	0
Utility energy commodity derivative liabilities	4,035	3,908
Other current liabilities	33,399	32,604
Other current liabilities	$ 175,454	$ 120,358

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Balance Sheet Components Other Non-Current Liabilities and Deferred Credits (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Operating Lease, Liability, Noncurrent	$ 67,635	$ 0
Finance Lease, Liability, Noncurrent	53,850	0
Deferred investment tax credits	31,383	29,725
Asset Retirement Obligation	18,455	18,266
Derivative Liability, Noncurrent	10,861	10,300
Other	13,564	12,740
Other Liabilities, Noncurrent	$ 195,748	$ 71,031

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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Regulated Asset Liability [Line Items]
Regulatory assets	$ 41,566	$ 48,552
Regulatory Assets, Noncurrent	605,497	614,354
Regulatory liabilities	55,464	113,209
Non-current regulatory liabilities	786,233	780,701
Income Tax Related
Regulated Asset Liability [Line Items]
Regulatory liabilities	29,401	27,997
Non-current regulatory liabilities	421,216	425,613
Natural Gas Deferrals [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	1,253	40,713
Non-current regulatory liabilities	0	0
Power Deferrals Regulatory Liability [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	12,555	25,072
Non-current regulatory liabilities	26,106	16,933
Decoupling surcharge
Regulated Asset Liability [Line Items]
Regulatory liabilities	1,061	6,782
Non-current regulatory liabilities	4,664	204
Removal Costs [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	300,373	297,379
Interest rate swaps
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	20,396	28,078
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	11,194	12,645
Non-current regulatory liabilities	13,478	12,494
Energy commodity derivatives
Regulated Asset Liability [Line Items]
Regulatory assets	28,159	41,428
Regulatory Assets, Noncurrent	11,862	16,866
Decoupling surcharge
Regulated Asset Liability [Line Items]
Regulatory assets	6,782	3,408
Regulatory Assets, Noncurrent	8,395	17,501
Pension and other postretirement benefit plans
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	224,805	228,062
Interest rate swaps
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	138,327	133,854
Income Tax Related
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	93,646	91,188
Settlement with Coeur d'Alene Tribe
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	42,316	42,643
Demand side management programs
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	15,064	19,674
Utility plant to be abandoned
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	24,477	24,334
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	6,625	3,716
Regulatory Assets, Noncurrent	$ 46,605	$ 40,232

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Revenue Revenue Utility Related Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Public Utility Operating Expenses Excise Taxes Collected	$ 19,089	$ 19,167

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Revenue Revenue Unsatisfied Performance Obligations (Details) $ in Millions	Mar. 31, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 9.1

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Revenue Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 396,481	$ 409,361
Residential Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	121,244	121,291
Commercial and Governmental Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	84,066	86,953
Industrial Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	25,248	25,119
Public Street and Highway Lighting Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,966	1,927
Total Retail Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	232,524	235,290
Electric Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,152	3,830
Other Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	8,194	6,291
Total Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	245,870	245,411
Residential Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	77,336	80,653
Commercial Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	36,595	37,373
Industrial and Interruptible Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,627	1,683
Total Retail Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	115,558	119,709
Transportation Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,484	2,567
Other Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,125	1,125
Total Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	119,167	123,401
Avista Utilities [Member]
Disaggregation of Revenue [Line Items]
Revenues	377,702	388,754
Avista Utilities [Member] | Residential Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	115,392	114,753
Avista Utilities [Member] | Commercial and Governmental Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	79,245	78,909
Avista Utilities [Member] | Industrial Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	25,248	25,119
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,903	1,859
Avista Utilities [Member] | Total Retail Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	221,788	220,640
Avista Utilities [Member] | Electric Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,152	3,830
Avista Utilities [Member] | Other Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	8,194	6,291
Avista Utilities [Member] | Total Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	235,134	230,761
Avista Utilities [Member] | Residential Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	77,336	80,653
Avista Utilities [Member] | Commercial Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	36,595	37,373
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,627	1,683
Avista Utilities [Member] | Total Retail Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	115,558	119,709
Avista Utilities [Member] | Transportation Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	2,484	2,567
Avista Utilities [Member] | Other Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	1,125	1,125
Avista Utilities [Member] | Total Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	119,167	123,401
Avista Utilities [Member] | Revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenues	354,301	354,162
Avista Utilities [Member] | Derivative revenues
Disaggregation of Revenue [Line Items]
Revenues	24,127	58,392
Avista Utilities [Member] | Alternative revenue programs
Disaggregation of Revenue [Line Items]
Revenues	(4,658)	(5,939)
Avista Utilities [Member] | Deferrals and amortizations for rate refunds to customers
Disaggregation of Revenue [Line Items]
Revenues	2,135	(19,822)
Avista Utilities [Member] | Other utility revenues
Disaggregation of Revenue [Line Items]
Revenues	1,797	1,961
Alaska Electric Light & Power [Member]
Disaggregation of Revenue [Line Items]
Revenues	10,881	13,663
Alaska Electric Light & Power [Member] | Residential Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	5,852	6,538
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,821	8,044
Alaska Electric Light & Power [Member] | Industrial Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	63	68
Alaska Electric Light & Power [Member] | Total Retail Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	10,736	14,650
Alaska Electric Light & Power [Member] | Electric Transmission [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Other Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Total Electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	10,736	14,650
Alaska Electric Light & Power [Member] | Residential Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Commercial Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Industrial and Interruptible Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Total Retail Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Transportation Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Other Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Total Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	0
Alaska Electric Light & Power [Member] | Revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenues	10,736	14,650
Alaska Electric Light & Power [Member] | Deferrals and amortizations for rate refunds to customers
Disaggregation of Revenue [Line Items]
Revenues	(48)	(1,122)
Alaska Electric Light & Power [Member] | Other utility revenues
Disaggregation of Revenue [Line Items]
Revenues	193	135
Corporate and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,898	6,944
Corporate and Other [Member] | Revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenues	7,647	6,729
Corporate and Other [Member] | Other revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 251	$ 215

XML

Leases Leases (Details)	3 Months Ended
	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:InvestmentsAndOtherNoncurrentAssets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:InvestmentsAndOtherNoncurrentAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Lessee, Operating Lease, Renewal Term	5 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	74 years
Lessee, Operating Lease, Renewal Term	50 years
State of Montana [Member]
Lessee, Lease, Description [Line Items]
Lease Expiration Date	Dec. 31, 2046
Snettisham Hydroelectric Project [Member]
Lessee, Lease, Description [Line Items]
Lease Expiration Date	Dec. 31, 2034

XML

Leases Leases Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 1,103
Variable Lease, Cost	243
Finance Lease, Right-of-Use Asset, Amortization	910
Finance Lease, Interest Expense	699
Operating Lease [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	1,346
Finance Lease [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 1,609

XML

Leases Leases Supplemental Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating Lease, Payments	$ 4,092
Finance Lease, Interest Payment on Liability	699
Total Lease Payments in Operating Cash Flows	4,791
Finance Lease, Principal Payments	$ 665

XML

Leases Leases Supplemental Balance Sheet Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Finance Lease, Liability	$ 56,545
Operating Lease, Liability	71,755
Operating Lease, Right-of-Use Asset	70,834	$ 0
Operating Lease, Liability, Current	4,120	0
Operating Lease, Liability, Noncurrent	67,635	0
Finance Lease, Right-of-Use Asset	53,711	0
Finance Lease, Liability, Current	2,695	0
Finance Lease, Liability, Noncurrent	$ 53,850	$ 0
Operating Lease, Weighted Average Remaining Lease Term	27 years 117 days
Finance Lease, Weighted Average Remaining Lease Term	9 years 233 days
Operating Lease, Weighted Average Discount Rate, Percent	3.82%
Finance Lease, Weighted Average Discount Rate, Percent	4.85%

XML

Leases Leases Maturities of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 4,272
Lessee, Operating Lease, Liability, Payments, Due Year Two	4,364
Lessee, Operating Lease, Liability, Payments, Due Year Three	4,367
Lessee, Operating Lease, Liability, Payments, Due Year Four	4,375
Lessee, Operating Lease, Liability, Payments, Due Year Five	4,383
Lessee, Operating Lease, Liability, Payments, Due after Year Five	95,923
Lessee, Operating Lease, Liability, Payments, Due	117,684
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(45,929)
Operating Lease, Liability	71,755
Finance Lease, Liability, Payments, Remainder of Fiscal Year	4,091
Finance Lease, Liability, Payments, Due Year Two	5,462
Finance Lease, Liability, Payments, Due Year Three	5,457
Finance Lease, Liability, Payments, Due Year Four	5,460
Finance Lease, Liability, Payments, Due Year Five	5,456
Finance Lease, Liability, Payments, Due after Year Five	54,574
Finance Lease, Liability, Payments, Due	80,500
Finance Lease, Liability, Undiscounted Excess Amount	(23,955)
Finance Lease, Liability	$ 56,545

XML

Leases Leases Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 4,995
Operating Leases, Future Minimum Payments, Due in Two Years	4,876
Operating Leases, Future Minimum Payments, Due in Three Years	4,859
Operating Leases, Future Minimum Payments, Due in Four Years	4,782
Operating Leases, Future Minimum Payments, Due in Five Years	4,780
Operating Leases, Future Minimum Payments, Due Thereafter	102,389
Operating Leases Future Minimum Payments Interest Included In Payments	0
Operating Leases, Future Minimum Payments Due	126,681
Capital Leases, Future Minimum Payments Due, Next Twelve Months	5,455
Capital Leases, Future Minimum Payments Due in Two Years	5,462
Capital Leases, Future Minimum Payments Due in Three Years	5,457
Capital Leases, Future Minimum Payments Due in Four Years	5,460
Capital Leases, Future Minimum Payments Due in Five Years	5,456
Capital Leases, Future Minimum Payments Due Thereafter	54,574
Capital Leases, Future Minimum Payments Due	81,864
Capital Leases, Future Minimum Payments, Interest Included in Payments	(24,654)
Capital Lease Obligations	$ 57,210

XML

Derivatives And Risk Management (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ 37,777	$ 51,747
Commodity Contracts [Member]
Derivative [Line Items]
Cash deposited as collateral	72,264	78,025
Letters of credit outstanding	56,100	6,500
Derivative, Fair Value, Amount Offset Against Collateral, Net	34,917	51,217
Liability position at aggregate fair value	1,406	2,193
Additional Collateral, Aggregate Fair Value	1,415	2,193
Interest Rate Swap [Member]
Derivative [Line Items]
Cash deposited as collateral	2,860	530
Derivative, Fair Value, Amount Offset Against Collateral, Net	2,860	530
Liability position at aggregate fair value	15,210	7,831
Additional Collateral, Aggregate Fair Value	$ 10,064	$ 6,579

XML

Derivatives And Risk Management (Energy Commodity Derivatives) (Details) frequency in Thousands, Volt in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 Volt frequency	Dec. 31, 2018 Volt frequency
Sales [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019	109	197
2020	123	123
2021	0	0
2022	0	0
2023	0	0
Thereafter	0	0
Sales [Member] | Physical [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019 | Volt	669	2,909
2020 | Volt	1,430	1,430
2021 | Volt	1,049	1,049
2022	0	0
2023	0	0
Thereafter | Volt	0	0
Sales [Member] | Financial [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019	2,280	2,790
2020	959	959
2021	246	0
2022	0	0
2023	0	0
Thereafter	0	0
Sales [Member] | Financial [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019 | Volt	35,913	54,418
2020 | Volt	16,378	14,625
2021 | Volt	4,100	4,100
2022 | Volt	0	0
2023	0	0
Thereafter | Volt	0	0
Purchase [Member] | Physical [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019	30	206
2020	0	0
2021	0	0
2022	0	0
2023	0	0
Thereafter	0	0
Purchase [Member] | Physical [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019 | Volt	4,640	10,732
2020 | Volt	1,138	1,138
2021 | Volt	0	0
2022 | Volt	0	0
2023 | Volt	0	0
Thereafter | Volt	0	0
Purchase [Member] | Financial [Member] | Electric Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019	596	941
2020	0	0
2021	0	0
2022	0	0
2023	0	0
Thereafter	0	0
Purchase [Member] | Financial [Member] | Gas Derivative [Member]
Energy Commodity Derivative Volumes [Line Items]
2019 | Volt	81,438	101,293
2020 | Volt	53,388	47,225
2021 | Volt	15,290	9,670
2022 | Volt	0	0
2023 | Volt	0	0
Thereafter | Volt	0	0

XML

Derivatives And Risk Management Derivatives and Risk Management (Foreign Currency Exchange Contracts) (Details) $ in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019 CAD ($) derivative_contracts	Mar. 31, 2019 USD ($) derivative_contracts	Dec. 31, 2018 CAD ($) derivative_contracts	Dec. 31, 2018 USD ($) derivative_contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Number Of Days Canadian Currency Prices Are Settled With U.S. Dollars	60 days
Number of Foreign Currency Derivatives Held | derivative_contracts	22	22	31	31
United States of America, Dollars | Foreign Exchange Contract [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative, Notional Amount		$ 6,681		$ 4,018
Canada, Dollars | Foreign Exchange Contract [Member]
Foreign Currency Fair Value Hedge Derivative [Line Items]
Derivative, Notional Amount	$ 8,917		$ 5,386

XML

Derivatives And Risk Management (Interest Rate Swap Agreements) (Details) - Interest Rate Swap [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) Caontracts	Dec. 31, 2018 USD ($) Caontracts
2019
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held | Caontracts	6	6
Derivative, Notional Amount | $	$ 70,000	$ 70,000
Derivative, Maturity Date	Dec. 31, 2019	Dec. 31, 2019
2020
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held | Caontracts	6	6
Derivative, Notional Amount | $	$ 60,000	$ 60,000
Derivative, Maturity Date	Dec. 31, 2020	Dec. 31, 2020
2021
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held | Caontracts	2	2
Derivative, Notional Amount | $	$ 25,000	$ 25,000
Derivative, Maturity Date	Dec. 31, 2021	Dec. 31, 2021
2022
Derivatives, Fair Value [Line Items]
Number of Interest Rate Derivatives Held | Caontracts	8	7
Derivative, Notional Amount | $	$ 90,000	$ 80,000
Derivative, Maturity Date	Dec. 31, 2022	Dec. 31, 2022

XML

Derivatives And Risk Management (Derivative Instruments Summary) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Gross Asset	$ 36,591,000	$ 46,849,000
Gross Liability	(86,732,000)	(102,453,000)
Collateral Netted	37,777,000	51,747,000
Net Asset (Liability) on Balance Sheet	(12,364,000)	(3,857,000)
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Collateral Netted	2,860,000	530,000
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Collateral Netted	34,917,000	51,217,000
Other Current Liabilities [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Asset		0
Gross Liability		(45,000)
Collateral Netted		0
Net Asset (Liability) on Balance Sheet		(45,000)
Other Current Liabilities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	0
Gross Liability	(524,000)
Collateral Netted	0
Net Asset (Liability) on Balance Sheet	(524,000)
Other Current Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	26,875,000	31,457,000
Gross Liability	(55,284,000)	(73,155,000)
Collateral Netted	24,374,000	37,790,000
Net Asset (Liability) on Balance Sheet	(4,035,000)	(3,908,000)
Other Current Assets [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	15,000
Gross Liability	(15,000)
Collateral Netted	0
Net Asset (Liability) on Balance Sheet	0
Other Current Assets [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	2,587,000	5,283,000
Gross Liability	(530,000)	0
Collateral Netted	0	0
Net Asset (Liability) on Balance Sheet	2,057,000	5,283,000
Other Current Assets [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	262,000	400,000
Gross Liability	(12,000)	(130,000)
Collateral Netted	0	0
Net Asset (Liability) on Balance Sheet	250,000	270,000
Other Property And Investments Net And Other Non-current Assets [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	2,503,000	5,283,000
Gross Liability	(1,754,000)	(440,000)
Collateral Netted	0	0
Net Asset (Liability) on Balance Sheet	749,000	4,843,000
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	0	0
Gross Liability	(12,402,000)	(7,391,000)
Collateral Netted	2,860,000	530,000
Net Asset (Liability) on Balance Sheet	(9,542,000)	(6,861,000)
Other Noncurrent Liabilities [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Asset	4,349,000	4,426,000
Gross Liability	(16,211,000)	(21,292,000)
Collateral Netted	10,543,000	13,427,000
Net Asset (Liability) on Balance Sheet	$ (1,319,000)	$ (3,439,000)

XML

Derivatives And Risk Management Derivatives and Risk Management (Collateral) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Fair Value, Amount Offset Against Collateral, Net	$ 37,777	$ 51,747
Commodity Contracts [Member]
Derivative [Line Items]
Liability position at aggregate fair value	1,406	2,193
Additional Collateral, Aggregate Fair Value	1,415	2,193
Collateral Already Posted, Aggregate Fair Value	72,264	78,025
Letters of credit outstanding	56,100	6,500
Derivative, Fair Value, Amount Offset Against Collateral, Net	34,917	51,217
Foreign Exchange Contract [Member]
Derivative [Line Items]
Collateral Already Posted, Aggregate Fair Value	0	0
Letters of credit outstanding	$ 0	$ 0

XML

Pension Plans And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Payment for Pension Benefits	$ 7,300	$ 7,300
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 22,000

XML

Pension Plans And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Percentage of Net Periodic Benefit Costs Capitalized to Utility Property	40.00%
Percentage of Net Periodic Benefit Costs Recorded to Operating Expenses	60.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,874	$ 5,450
Interest cost	7,138	6,466
Expected return on plan assets	(7,815)	(8,250)
Amortization of prior service cost	75	75
Net loss recognition	2,415	2,088
Net periodic benefit cost	6,687	5,829
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	772	804
Interest cost	1,372	1,197
Expected return on plan assets	(718)	(500)
Amortization of prior service cost	(275)	(815)
Net loss recognition	1,246	1,655
Net periodic benefit cost	$ 2,397	$ 2,341

XML

Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Federal income taxes at statutory rates	$ 30,639	$ 13,790
Federal income taxes at statutory rates	21.00%	21.00%
Tax effect of regulatory treatment of utility plant differences	$ (2,080)	$ (1,018)
Tax effect of regulatory treatment of utility plant differences	(1.40%)	(1.60%)
State income tax expense	$ 1,659	$ 964
State income tax expense	1.10%	1.50%
Acquisition costs	$ (1,824)	$ 46
Acquisition costs	(1.20%)	0.10%
Settlement of equity awards	$ 612	$ (990)
Settlement of equity awards	0.40%	(1.50%)
Other	$ 1,011	$ (2,082)
Other	0.70%	(3.20%)
Income Tax Expense (Benefit)	$ 30,017	$ 10,710
Effective Income Tax Rate	20.60%	16.30%

XML

Committed Lines of Credit (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jul. 01, 2014	Apr. 30, 2014
Short-term Debt [Line Items]
Document Period End Date	Mar. 31, 2019
Avista Utilities [Member]
Short-term Debt [Line Items]
Line of Credit, Current	$ 119,000	$ 190,000
Line of Credit Facility, Maximum Borrowing Capacity				$ 400,000
Letters of credit outstanding at end of period	$ 60,103	$ 10,503
Average interest rate at end of period	3.31%	3.18%
Alaska Electric Light & Power [Member]
Short-term Debt [Line Items]
Line of Credit, Current	$ 0	$ 0
Line of Credit Facility, Maximum Borrowing Capacity			$ 25,000
Letters of credit outstanding at end of period	$ 0	$ 0

XML

Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Schedule of Distribution Rates Paid) (Details) - Trust Preferred Securities Subject to Mandatory Redemption [Member]	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest Rate at End of Period	3.50%	3.61%
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate at End of Period	3.50%	2.36%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate at End of Period	3.61%	3.61%

XML

Long- Term Debt to Affiliated Trust Long-Term Debt to Affiliated Trust (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2000	Dec. 31, 1997
Debt Instrument [Line Items]
Payments for Repurchase of Trust Preferred Securities		$ 10.0
Equity Method Investment, Ownership Percentage	100.00%
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 51.5		$ 51.5
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Trust Preferred Securities			50.0
Debt Instrument, Description of Variable Rate Basis	LIBOR
Debt Instrument, Basis Spread on Variable Rate	0.875%
Common Trust Securities [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Trust Preferred Securities			$ 1.5

XML

Fair Value (Carrying Value And Estimated Fair Value Of Financial Instruments) (Details) $ in Thousands	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital Lease Obligations		$ 57,210
Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 1,155,199	1,142,292
Level 2 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	1,053,500	1,053,500
Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	734,742	734,742
Level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	767,000	767,000
Alaska Electric Light & Power [Member] | Capital Lease Obligations [Member] | Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital Lease Obligations	56,900	55,600
Alaska Electric Light & Power [Member] | Capital Lease Obligations [Member] | Level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital Lease Obligations	56,545	57,210
Affiliated Entity [Member] | Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	38,145	38,145
Affiliated Entity [Member] | Level 3 [Member] | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 51,547	$ 51,547
Measurement Input, Quoted Price [Member] | Secured and Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Measurement Input | $ / shares	100.0
Measurement Input, Quoted Price [Member] | Minimum [Member] | Secured and Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Measurement Input | $ / shares	74.00
Measurement Input, Quoted Price [Member] | Maximum [Member] | Secured and Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Measurement Input | $ / shares	121.59

XML

Fair Value (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	$ 36,591	$ 46,849
Liability	86,732	102,453
Cash and cash equivalents	14,861	14,656	$ 26,273	$ 16,172
Fixed Income Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	500	500
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, assets	(33,535)	(36,453)
Assets, Fair Value Disclosure	11,270	18,298
Counterparty and collateral netting, liabilities	(71,312)	(88,200)
Financial Liabilities Fair Value Disclosure	15,420	14,253
Fair Value, Measurements, Recurring [Member] | Natural Gas Exchange Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, assets	(123)	(31)
Derivative Asset	0	0
Counterparty and collateral netting, liabilities	(123)	(31)
Derivative Liability	2,104	2,774
Fair Value, Measurements, Recurring [Member] | Power Exchange Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, liabilities	0	0
Derivative Liability	612	2,488
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, assets	(2,284)	(440)
Derivative Asset	2,806	10,126
Counterparty and collateral netting, liabilities	(5,144)	(970)
Derivative Liability	10,066	6,861
Fair Value, Measurements, Recurring [Member] | Energy commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, assets	(31,113)	(35,982)
Derivative Asset	250	270
Counterparty and collateral netting, liabilities	(66,030)	(87,199)
Derivative Liability	2,638	2,084
Fair Value, Measurements, Recurring [Member] | Power Option Agreement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, liabilities		0
Derivative Liability		1
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Counterparty and collateral netting, assets	(15)
Derivative Asset	0
Counterparty and collateral netting, liabilities	(15)	0
Derivative Liability	0	45
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	8,214	7,902
Financial Liabilities Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	36,468	46,818
Financial Liabilities Fair Value Disclosure	83,893	97,159
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	5,090	10,566
Liability	15,210	7,831
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Energy commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	31,363	36,252
Liability	68,668	89,283
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	15
Liability	15	45
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	123	31
Financial Liabilities Fair Value Disclosure	2,839	5,294
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Natural Gas Exchange Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Asset	123	31
Liability	2,227	2,805
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Exchange Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability	612	2,488
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Power Option Agreement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liability		1
Fixed Income Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	1,758	1,745
Fixed Income Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	1,758	1,745
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	6,456	6,157
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation assets:	$ 6,456	$ 6,157

XML

Fair Value (Quantitative Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) $ / MWH MMBTU MWh $ / MmBtu	Dec. 31, 2018 USD ($)
Power Exchange Agreements [Member] | Surrogate Facility Pricing [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Transaction/Delivery Volumes | MWh	28,860
Average operation and maintenance charges | $ / MWH	45.61
Minimum [Member] | Power Exchange Agreements [Member] | Surrogate Facility Pricing [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair Value Assumptions Operation And Maintenance Charges | $ / MWH	40.05
Maximum [Member] | Power Exchange Agreements [Member] | Surrogate Facility Pricing [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair Value Assumptions Operation And Maintenance Charges | $ / MWH	52.59
Fair Value, Measurements, Recurring [Member] | Power Exchange Agreements [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Liability | $	$ (612)	$ (2,488)
Fair Value, Measurements, Recurring [Member] | Natural Gas Exchange Agreements [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative Liability | $	$ (2,104)	$ (2,774)
Sales [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative, Forward Price | $ / MmBtu	1.63
Transaction/Delivery Volumes | MMBTU	60,000
Sales [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative, Forward Price | $ / MmBtu	4.11
Transaction/Delivery Volumes | MMBTU	310,000
Purchase [Member] | Minimum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative, Forward Price | $ / MmBtu	1.70
Transaction/Delivery Volumes | MMBTU	270,000
Purchase [Member] | Maximum [Member] | Natural Gas Exchange Agreements [Member] | Internally Derived Weighted Average Cost Of Gas [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Derivative, Forward Price | $ / MmBtu	2.98
Transaction/Delivery Volumes | MMBTU	310,000

XML

Fair Value (Reconciliation For All Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ (5,262)	$ (16,409)
Included in regulatory assets/liabilities	7,959	(1,674)
Settlements	(5,413)	5,115
Ending Balance	(2,716)	(12,968)
Natural Gas Exchange Agreements [Member]
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(2,774)	(3,164)
Included in regulatory assets/liabilities	8,977	203
Settlements	(8,307)	156
Ending Balance	(2,104)	(2,805)
Power Exchange Agreements [Member]
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(2,488)	(13,245)
Included in regulatory assets/liabilities	(1,018)	(1,877)
Settlements	2,894	4,959
Ending Balance	$ (612)	$ (10,163)

XML

Common Stock Common Stock (Details) - shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Sales Agency Agreements Common Stock, Shares Authorized	200,000,000	200,000,000
Document Period End Date	Mar. 31, 2019
Sales Agency Agreement [Member]
Class of Stock [Line Items]
Shares issued from sales agency agreements	0
Sales Agency Agreements Common Stock, Shares Authorized	3,800,000
Common Stock Shares Authorized Under Sales Agency Agreements Remaining Shares Authorized To Sell	1,100,000

XML

Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss Reclassifications from AOCL (Details) - Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] - Reclassification out of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net prior service cost	$ (200)	$ (228)
Amortization of net loss	3,661	2,995
Adjustment due to effects of regulation	(3,258)	(2,508)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	203	259
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	(43)	(55)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 160	$ 204

XML

Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans Net Unamortized (Gain) Loss, Tax	$ 2,048	$ 2,091
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ 7,706	$ 7,866

XML

Earnings Per Share Attributable To Avista Corporation (Computation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income from continuing operations attributable to Avista Corp. shareholders	$ 115,794	$ 54,890
Denominator:
Weighted-average number of common shares outstanding-basic	65,733	65,639
Performance and restricted stock awards	208	292
Weighted-average number of common shares outstanding-diluted	65,941	65,931
Earnings Per Share, Basic [Abstract]
Basic	$ 1.76	$ 0.84
Earnings Per Share, Diluted [Abstract]
Diluted	$ 1.76	$ 0.83

XML

Commitments And Contingencies (Details) - Maximum [Member] - 2015 Washington General Rate Case [Member] $ in Millions	Mar. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Estimated Potential Loss	$ 35.2
Electric [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimated Potential Loss	28.3
Natural Gas [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimated Potential Loss	$ 6.9

XML

Information By Business Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Reportable_Segments	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Merger transaction costs	$ 19,664	$ 672
Number of Reportable Segments | Reportable_Segments	2
Operating revenues	$ 396,481	409,361
Resource costs	137,347	154,618
Other operating expenses	110,997	84,794
Depreciation and amortization	49,123	44,914
Income from operations	67,071	94,206
Interest expense	26,008	25,029
Income taxes	30,017	10,710
Net income from continuing operations attributable to Avista Corp. shareholders	115,794	54,890
Payments to Acquire Other Property, Plant, and Equipment	93,777	82,031
Total assets	5,889,983		$ 5,782,576
Assets held for sale	15,874		0
Avista Utilities [Member]
Segment Reporting Information [Line Items]
Operating revenues	377,702	388,754
Alaska Electric Light & Power [Member]
Segment Reporting Information [Line Items]
Operating revenues	10,881	13,663
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	7,898	6,944
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues	0	0
Resource costs	0	0
Other operating expenses	0	0
Depreciation and amortization	0	0
Income from operations	0	0
Interest expense	(440)	(165)
Income taxes	0	0
Net income from continuing operations attributable to Avista Corp. shareholders	0	0
Payments to Acquire Other Property, Plant, and Equipment	0	0
Total assets	(17,865)		(35,528)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	388,583	402,417
Resource costs	137,347	154,618
Other operating expenses	103,642	77,970
Depreciation and amortization	48,914	44,733
Income from operations	66,737	94,267
Interest expense	25,860	24,859
Income taxes	29,907	11,881
Net income from continuing operations attributable to Avista Corp. shareholders	115,453	59,312
Payments to Acquire Other Property, Plant, and Equipment	93,615	81,817
Total assets	5,800,450		5,731,054
Operating Segments [Member] | Avista Utilities [Member]
Segment Reporting Information [Line Items]
Operating revenues	377,702	388,754
Resource costs	138,712	151,665
Other operating expenses	100,583	75,139
Depreciation and amortization	46,507	43,267
Income from operations	60,224	88,145
Interest expense	24,264	23,965
Income taxes	28,544	10,417
Net income from continuing operations attributable to Avista Corp. shareholders	111,901	55,540
Payments to Acquire Other Property, Plant, and Equipment	92,309	81,176
Total assets	5,524,962		5,458,104
Operating Segments [Member] | Alaska Electric Light & Power [Member]
Segment Reporting Information [Line Items]
Operating revenues	10,881	13,663
Resource costs	(1,365)	2,953
Other operating expenses	3,059	2,831
Depreciation and amortization	2,407	1,466
Income from operations	6,513	6,122
Interest expense	1,596	894
Income taxes	1,363	1,464
Net income from continuing operations attributable to Avista Corp. shareholders	3,552	3,772
Payments to Acquire Other Property, Plant, and Equipment	1,306	641
Total assets	275,488		272,950
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	7,898	6,944
Resource costs	0	0
Other operating expenses	7,355	6,824
Depreciation and amortization	209	181
Income from operations	334	(61)
Interest expense	588	335
Income taxes	110	(1,171)
Net income from continuing operations attributable to Avista Corp. shareholders	341	(4,422)
Payments to Acquire Other Property, Plant, and Equipment	162	$ 214
Total assets	$ 107,398		$ 87,050

XML

Termination of Proposed Acquisition by Hydro One Termination of Proposed Acquisition by Hydro One (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 24, 2019	Mar. 31, 2019	Mar. 31, 2018	Jul. 19, 2017
Business Acquisition [Line Items]
Merger termination fee		$ 103,000	$ 0
Merger transaction costs		$ 19,664	$ 672
Hydro One [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price				$ 53
Merger termination fee	$ 103,000

XML

Assets Held for Sale Assets Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Apr. 18, 2019	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			89.20%
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group Including Discontinued Operation Gross Consideration		$ 17.5
Disposal Group Including Discontinued Operation Consideration Held in Escrow		$ 1.2
Disposal Group Including Discontinued Operation Percentage of Gross Consideration Held in Escrow		7.00%
Disposal Group, Including Discontinued Operation, Consideration		$ 16.6
Disposal Group Not Discontinued Operation Gain (Loss) On Disposal Net of Tax	$ 2.4

XML

Assets Held for Sale Assets Held for Sale Major Classes of Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Allowance for Doubtful Accounts	$ 5,000
Disposal Group, Including Discontinued Operation, Assets	15,874	$ 0
Disposal Group, Including Discontinued Operation, Liabilities	1,813	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	1,026
Accounts and notes receivable-less allowances of $5	3,048
Materials and supplies	2,922
Other current assets	159
Total current assets	7,155
Goodwill	5,247
Deferred Income Taxes	1,598
Other property and investments-net and other non-current assets	1,874
Disposal Group, Including Discontinued Operation, Assets	15,874
Accounts payable	760
Other current liabilities	901
Total current liabilities	1,661
Other non-current liabilities	152
Disposal Group, Including Discontinued Operation, Liabilities	$ 1,813