10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________________________________________________________________________

FORM 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2022

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 No. 333-192954

(An Electric Membership Corporation)

(Exact name of registrant as specified in its charter)

Georgia (State or other jurisdiction of incorporation or organization)	58-1211925 (I.R.S. employer identification no.)
2100 East Exchange Place Tucker, Georgia (Address of principal executive offices)	30084-5336 (Zip Code)
Registrant's telephone number, including area code	(770) 270-7600

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  ☐   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 during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes  ☒    No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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 ☐    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. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐    No ☒

Securities registered pursuant to Section 12(b) of the Act:

Title of each class:	Trading Symbol(s)	Name of each exchange on which registered:
None	N/A	N/A

Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date. The registrant is a membership corporation and has no authorized or outstanding equity securities.

OGLETHORPE POWER CORPORATION

INDEX TO QUARTERLY REPORT ON FORM 10-Q

FOR THE QUARTER ENDED MARCH 31, 2022

		Page No.
PART I—FINANCIAL INFORMATION
Item 1.	Financial Statements	1
	Unaudited Consolidated Balance Sheets as of March 31, 2022 and December 31, 2021	1
	Unaudited Consolidated Statements of Revenues and Expenses For the Three Months ended March 31, 2022 and 2021	3
	Unaudited Consolidated Statements of Patronage Capital and Membership Fees For the Three Months ended March 31, 2022 and 2021	4
	Unaudited Consolidated Statements of Cash Flows For the Three Months ended March 31, 2022 and 2021	5
	Notes to Unaudited Consolidated Financial Statements	6
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	26
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	35
Item 4.	Controls and Procedures	35
PART II—OTHER INFORMATION
Item 1.	Legal Proceedings	35
Item 1A.	Risk Factors	35
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	35
Item 3.	Defaults Upon Senior Securities	35
Item 4.	Mine Safety Disclosures	36
Item 5.	Other Information	36
Item 6.	Exhibits	37
SIGNATURES		38

i

CAUTIONARY STATEMENT REGARDING

FORWARD-LOOKING STATEMENTS

This quarterly report on Form 10-Q contains "forward-looking statements." All statements, other than statements of historical facts, that address activities, events or developments that we expect or anticipate to occur in the future, including matters such as future capital expenditures, business strategy, regulatory actions, and development, construction or operation of facilities (often, but not always, identified through the use of words or phrases such as "will likely result," "are expected to," "will continue," "is anticipated," "estimated," "projection," "target" and "outlook") are forward-looking statements.

Although we believe that in making these forward-looking statements our expectations are based on reasonable assumptions, any forward-looking statement involves uncertainties and there are important factors that could cause actual results to differ materially from those expressed or implied by these forward-looking statements. Some of the risks, uncertainties and assumptions that may cause actual results to differ from these forward-looking statements are described under "Item 1A—RISK FACTORS" and in other sections of our annual report on Form 10-K for the fiscal year ended December 31, 2021 and in this quarterly report on Form 10-Q. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this quarterly report may not occur.

Any forward-looking statement speaks only as of the date of this quarterly report, and, except as required by law, we undertake no obligation to update any forward-looking statement to reflect events or circumstances after the date on which it is made or to reflect the occurrence of unanticipated events. New factors emerge from time to time, and it is not possible for us to predict all of them; nor can we assess the impact of each factor or the extent to which any factor, or combination of factors, may cause results to differ materially from those contained in any forward-looking statement. Factors that could cause actual results to differ materially from those indicated in any forward-looking statement include, but are not limited to:

•cost increases and schedule delays with respect to our capital improvement and construction projects, in particular, the construction of two additional nuclear units at Plant Vogtle;

•the duration and severity of the current coronavirus ("COVID-19") pandemic and resulting economic disruption and its impact on our business, financial condition, operations, construction projects, including the additional units at Plant Vogtle, and our members and their service territories;

•the resolution of any disputes between two or more of the Vogtle co-owners, including the current dispute regarding certain cost-mitigation provisions under the ownership participation agreement;

•decisions made by the Georgia Public Service Commission in the regulatory process related to the two additional units at Plant Vogtle;

•a decision by Georgia Power Company to cancel the additional Vogtle units or a decision by more than 10% of the co-owners of the additional Vogtle units not to proceed with the construction of the additional Vogtle units upon the occurrence of certain material adverse events;

•the impact of regulatory or legislative responses to climate change initiatives or efforts to reduce greenhouse gas emissions, including carbon dioxide;

•costs associated with achieving and maintaining compliance with applicable environmental laws and regulations, including those related to air emissions, water and coal combustion byproducts;

•legislative and regulatory compliance standards and our ability to comply with any applicable standards, including mandatory reliability standards, and potential penalties for non-compliance;

•our access to capital, the cost to access capital, and the results of our financing and refinancing efforts, including availability of funds in the capital markets;

•our ability to receive advances under the U.S. Department of Energy loan guarantee agreement for constructing two additional nuclear units at Plant Vogtle;

•the occurrence of certain events that give the Department of Energy the option to require that we repay all amounts outstanding under the loan guarantee agreement with the Department of Energy over a five-year period and its decision to require such repayment;

ii

•the continued availability of funding from the Rural Utilities Service;

•increasing debt caused by significant capital expenditures;

•unanticipated changes in capital expenditures, operating expenses and liquidity needs;

•actions by credit rating agencies;

•commercial banking and financial market conditions;

•risks and regulatory requirements related to the ownership and construction of nuclear facilities;

•adequate funding of our nuclear and coal ash pond decommissioning trust funds including investment performance and projected decommissioning costs;

•early retirement of one or more of our co-owned coal facilities;

•continued efficient operation of our generation facilities by us and third-parties;

•the availability of an adequate and economical supply of fuel, water and other materials;

•reliance on third-parties to efficiently manage, distribute and deliver generated electricity;

•the direct or indirect effect on our business resulting from cyber or physical attacks on us, our members or third-party service providers, vendors or contractors;

•acts of sabotage, wars or terrorist activities, including cyber attacks;

•changes in technology available to and utilized by us, our competitors, or residential or commercial consumers in our members' service territories, including from the development and deployment of distributed generation and energy storage technologies;

•the inability of counterparties to meet their obligations to us, including failure to perform under agreements;

•our members' ability to perform their obligations to us;

•our members' ability to offer their residential, commercial and industrial customers competitive rates;

•changes to protections granted by the Georgia Territorial Act that subject our members to increased competition;

•unanticipated variation in demand for electricity or load forecasts resulting from changes in population and business growth (and declines), consumer consumption, energy conservation and efficiency efforts and the general economy;

•general economic conditions;

•weather conditions and other natural phenomena;

•litigation or legal and administrative proceedings and settlements;

•unanticipated changes in interest rates or rates of inflation;

•significant changes in our relationship with our employees, including the availability of qualified personnel;

•significant changes in critical accounting policies material to us;

•hazards customary to the electric industry and the possibility that we may not have adequate insurance to cover losses resulting from these hazards;

iii

•catastrophic events such as fires, earthquakes, floods, droughts, hurricanes, explosions, pandemic health events, or similar occurrences; and

•other factors discussed elsewhere in this quarterly report or in other reports we file with the SEC.

iv

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements

Oglethorpe Power Corporation

Consolidated Balance Sheets (Unaudited)

 March 31, 2022 and December 31, 2021

	(dollars in thousands)
	2022		2021
Assets
Electric plant:
In service	$	9,864,049	$	9,865,660
Right-of-use assets—finance leases	302,732		302,732
Less: Accumulated provision for depreciation	(5,682,179)		(5,565,724)
	4,484,602		4,602,668
Nuclear fuel, at amortized cost	383,403		375,267
Construction work in progress	6,981,823		6,779,392
Total electric plant	11,849,828		11,757,327
Investments and funds:
Nuclear decommissioning trust fund	615,247		659,910
Investment in associated companies	76,389		75,826
Long-term investments	702,821		711,379
Restricted investments	—		73,702
Other	32,432		31,991
Total investments and funds	1,426,889		1,552,808
Current assets:
Cash and cash equivalents	467,353		579,350
Restricted cash and short-term investments	236,015		248,150
Receivables	160,085		159,538
Inventories, at average cost	261,294		260,526
Prepayments and other current assets	105,234		60,486
Total current assets	1,229,981		1,308,050
Deferred charges and other assets:
Regulatory assets	1,088,130		1,008,790
Prepayments to Georgia Power Company	30,062		27,124
Other	112,179		52,927
Total deferred charges	1,230,371		1,088,841
Total assets	$	15,737,069	$	15,707,026

The accompanying notes are an integral part of these consolidated financial statements.

1

2

Oglethorpe Power Corporation

Consolidated Balance Sheets (Unaudited)

 March 31, 2022 and December 31, 2021

	(dollars in thousands)
	2022		2021
Equity and Liabilities
Capitalization:
Patronage capital and membership fees	$	1,152,403	$	1,130,423
Long-term debt	10,945,787		10,529,449
Obligation under finance leases	61,335		61,335
Other	27,893		27,701
Total capitalization	12,187,418		11,748,908
Current liabilities:
Long-term debt and finance leases due within one year	346,516		281,238
Short-term borrowings	663,067		1,095,971
Accounts payable	63,488		182,164
Accrued interest	77,748		96,410
Member power bill prepayments, current	26,754		26,102
Other current liabilities	80,240		36,123
Total current liabilities	1,257,813		1,718,008
Deferred credits and other liabilities:
Asset retirement obligations	1,299,183		1,287,143
Member power bill prepayments, non-current	71,361		80,001
Regulatory liabilities	898,095		849,449
Other	23,199		23,517
Total deferred credits and other liabilities	2,291,838		2,240,110
Total equity and liabilities	$	15,737,069	$	15,707,026

The accompanying notes are an integral part of these consolidated financial statements.

3

Oglethorpe Power Corporation

Consolidated Statements of Revenues and Expenses (Unaudited)

 For the Three Months Ended March 31, 2022 and 2021

	(dollars in thousands)
	Three Months
	2022		2021
Operating revenues:
Sales to members	$	417,449	$	376,272
Sales to non-members	2,993		59
Total operating revenues	420,442		376,331
Operating expenses:
Fuel	165,484		108,065
Production	95,780		105,373
Depreciation and amortization	70,926		67,619
Purchased power	16,875		16,920
Accretion	13,532		13,781
Total operating expenses	362,597		311,758
Operating margin	57,845		64,573
Other income:
Investment income	11,847		11,960
Other	3,030		2,171
Total other income	14,877		14,131
Interest charges:
Interest expense	104,669		103,479
Allowance for debt funds used during construction	(56,773)		(53,639)
Amortization of debt discount and expense	2,846		2,906
Net interest charges	50,742		52,746
Net margin	$	21,980	$	25,958

The accompanying notes are an integral part of these consolidated financial statements.

4

Oglethorpe Power Corporation

Consolidated Statements of Patronage Capital and Membership Fees (Unaudited)

 For the Three Months Ended March 31, 2022 and 2021

	(dollars in thousands)
Balance at December 31, 2020	$	1,072,642
Net margin	25,958
Balance at March 31, 2021	$	1,098,600
Balance at December 31, 2021	$	1,130,423
Net margin	21,980
Balance at March 31, 2022	$	1,152,403

The accompanying notes are an integral part of these consolidated financial statements.

5

Oglethorpe Power Corporation

Consolidated Statements of Cash Flows (Unaudited)

 For the Three Months Ended March 31, 2022 and 2021

	(dollars in thousands)
	2022		2021
Cash flows from operating activities:
Net margin	$	21,980	$	25,958
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization, including nuclear fuel	92,211		99,638
Accretion cost	13,532		13,781
Amortization of deferred gains	(447)		(447)
Allowance for equity funds used during construction	(135)		(26)
Deferred outage costs	(22,228)		(13,231)
Loss (gain) on sale of investments	8,271		(9,134)
Regulatory deferral of costs associated with nuclear decommissioning	(14,694)		284
Other	974		(641)
Change in operating assets and liabilities:
Receivables	(8,620)		1,455
Inventories	(715)		8,567
Prepayments and other current assets	5,954		4,039
Accounts payable	(78,836)		(41,415)
Accrued interest	(18,662)		4,300
Accrued taxes	16,180		(22,542)
Other current liabilities	29,836		(6,273)
Member power bill prepayments	(7,988)		(18,779)
Rate management program collections	11,017		37,979
Total adjustments	25,650		57,555
Net cash provided by operating activities	47,630		83,513
Cash flows from investing activities:
Property additions	(280,364)		(324,181)
Activity in nuclear decommissioning trust fund—Purchases	(195,038)		(250,195)
—Proceeds	192,858		248,147
Decrease in restricted cash and investments	123,232		54,280
Activity in other long-term investments—Purchases	(111,490)		(120,752)
—Proceeds	94,279		72,293
Other	(3,718)		144
Net cash used in investing activities	(180,241)		(320,264)
Cash flows from financing activities:
Long-term debt proceeds	102,185		238,578
Long-term debt payments	(115,168)		(61,828)
Increase in short-term borrowings, net	60,501		217,674
Other	10,496		(2,083)
Net cash provided by financing activities	58,014		392,341
Net (decrease) increase in cash, cash equivalents and restricted cash	(74,597)		155,590
Cash, cash equivalents and restricted cash at beginning of period	581,150		405,511
Cash, cash equivalents and restricted cash at end of period	$	506,553	$	561,101
Supplemental cash flow information:
Cash paid for—
Interest (net of amounts capitalized)	$	66,117	$	45,127
Supplemental disclosure of non-cash investing and financing activities:
Change in asset retirement obligations	$	—	$	(399)
Accrued property additions at end of period	$	21,469	$	76,364

The accompanying notes are an integral part of these consolidated financial statements.

6

Oglethorpe Power Corporation

Notes to Unaudited Consolidated Financial Statements

(A)General.    The consolidated financial statements included in this report have been prepared by us pursuant to the rules and regulations of the Securities and Exchange Commission. In the opinion of management, the information furnished in this report reflects all adjustments (which include only normal recurring adjustments) and estimates necessary to fairly state, in all material respects, our financial condition and results of operations for the three-month periods ended March 31, 2022 and 2021. Examples of estimates used include items related to (i) our asset retirement obligations, such as closure and post-closure cost estimates, timing of expenditures, escalation factors and discount rates, and (ii) revenue recognition, such as determining the nature and timing of satisfaction of performance obligations, determining the standalone selling price of performance obligations and variable consideration. Actual results may differ from those estimates. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to SEC rules and regulations, although we believe that the disclosures are adequate to make the information presented not misleading. Certain prior year amounts have been reclassified to conform with current year presentation.

These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, as filed with the SEC. The results of operations for the three-month period ended March 31, 2022 are not necessarily indicative of results to be expected for the full year. As noted in our 2021 Form 10-K, our revenues consist primarily of sales to our 38 electric distribution cooperative members and, thus, the receivables on the consolidated balance sheets are principally from our members. See "Notes to Consolidated Financial Statements" in our 2021 Form 10-K.

(B)Fair Value.    Authoritative guidance regarding fair value measurements for financial and non-financial assets and liabilities defines fair value, establishes a framework for measuring fair value in accordance with generally accepted accounting principles, and expands disclosures about fair value measurements.

The guidance establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows:

•Level 1.  Quoted prices from active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Quoted prices in active markets provide the most reliable evidence of fair value and are used to measure fair value whenever available. Level 1 primarily consists of financial instruments that are exchange-traded.

•Level 2.  Pricing inputs other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date. Level 2 includes 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. Level 2 primarily consists of financial instruments that are non-exchange-traded but have significant observable inputs.

•Level 3.  Pricing inputs that include significant inputs which are generally less observable from objective sources. These inputs may include internally developed methodologies that result in management's best estimate of fair value. Level 3 financial instruments are those whose fair value is based on significant unobservable inputs.

As required by the guidance, assets and liabilities measured at fair value are based on one or more of the following three valuation techniques:

1.Market approach.    The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities (including a business) and deriving fair value based on these inputs.

7

2.Income approach.    The income approach uses valuation techniques to convert future amounts (for example, cash flows or earnings) to a single present amount (discounted). The measurement is based on the value indicated by current market expectations about those future amounts.

3.Cost approach.    The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (often referred to as current replacement cost). This approach assumes that the fair value would not exceed what it would cost a market participant to acquire or construct a substitute asset of comparable utility, adjusted for obsolescence.

The tables below detail assets and liabilities measured at fair value on a recurring basis at March 31, 2022 and December 31, 2021.

	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	March 31, 2022		(Level 1)		(Level 2)		(Level 3)
	(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity	$	237,403	$	237,403	$	—	$	—
International equity trust	126,621		—		126,621		—
Corporate bonds and debt	47,987		—		46,718		1,269
US Treasury securities	102,406		102,406		—		—
Mortgage backed securities	22,192		—		22,192		—
Domestic mutual funds	68,348		68,348		—		—
Municipal bonds	809		—		809		—
Federal agency securities	2,268		—		2,268		—
Other	7,213		7,213		—		—
Long-term investments:
International equity trust	36,959		—		36,959		—
Corporate bonds and debt	4,129		—		2,938		1,191
US Treasury securities	40,382		40,382		—		—
Mortgage backed securities	—		—		—		—
Domestic mutual funds	271,155		271,155		—		—
Federal agency securities	—		—		—		—
Treasury STRIPS	350,275		—		350,275		—
Other	(79)		(79)		—		—
Natural gas swaps	173,946		—		173,946		—

8

	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	December 31, 2021		(Level 1)		(Level 2)		(Level 3)
	(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity	$	249,999	$	249,999	$	—	$	—
International equity trust	140,718		—		140,718		—
Corporate bonds and debt	72,936		—		72,369		567
US Treasury securities	53,321		53,321		—		—
Mortgage backed securities	40,460		—		40,460		—
Domestic mutual funds	75,384		75,384		—		—
Municipal bonds	1,133		—		1,133		—
Federal agency securities	9,608		—		9,608		—
Other	16,351		13,623		2,728		—
Long-term investments:
International equity trust	35,873		—		35,873		—
Corporate bonds and debt	14,022		—		12,656		1,366
US Treasury securities	15,259		15,259		—		—
Mortgage backed securities	12,021		—		12,021		—
Domestic mutual funds	277,937		277,937		—		—
Federal agency securities	257		—		257		—
Treasury STRIPS	350,532		—		350,532		—
Other	5,478		5,478		—		—
Natural gas swaps	63,994		—		63,994		—

The Level 2 investments above in corporate bonds and debt, federal agency securities, and mortgage backed securities may not be exchange traded. The fair value measurements for these investments are based on a market approach, including the use of observable inputs at or near the valuation date. Common inputs include reported trades and broker/dealer bid/ask prices. The fair value of the Level 2 investments above in international equity trust are calculated based on the net asset value per share of the fund. There are no unfunded commitments for the international equity trust and redemption may occur daily with a 3-day redemption notice period.

The Level 3 investments above in corporate bonds and debt consist of investments in bank loans which are not exchange traded. Although these securities may be liquid and priced daily, their inputs are not observable.

The estimated fair values of our long-term debt, including current maturities at March 31, 2022 and December 31, 2021 were as follows:

	2022				2021
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Long-term debt	$	10,830,072	$	11,338,418	$	10,915,054	$	12,741,046

The estimated fair value of long-term debt is classified as Level 2 and is estimated based on observed or quoted market prices for the same or similar issues or on current rates offered to us for debt of similar maturities. The primary sources of our long-term debt consist of first mortgage bonds, pollution control revenue bonds and long-term debt issued by the Federal Financing Bank that is guaranteed by the Rural Utilities Service or the U.S. Department of Energy. The valuations for the first mortgage bonds and the pollution control revenue bonds were obtained from a third party data reporting service, and are based on secondary market trading of our debt. Valuations for debt issued by the Federal

9

Financing Bank are based on U.S. Treasury rates as of March 31, 2022 and December 31, 2021 plus an applicable spread, which reflects our borrowing rate for new loans of this type from the Federal Financing Bank.

For cash and cash equivalents, and receivables, the carrying amount approximates fair value because of the short-term maturity of those instruments. Restricted investments consist of funds on deposit with the Rural Utilities Service in the Cushion of Credit Account and the carrying amount of these investments approximates fair value because of the liquid nature of the deposits with the U.S. Treasury.

(C)Derivative Instruments.    We use commodity derivatives to manage our exposure to fluctuations in the market price of natural gas. Our risk management and compliance committee provides general oversight over all derivative activities. We do not apply hedge accounting to derivative transactions, but instead apply regulated operations accounting. Consistent with our rate-making, unrealized gains or losses on our natural gas swaps are reflected as regulatory assets or liabilities, as appropriate. Realized gains and losses on natural gas swaps are included in fuel expense within our consolidated statements of revenues and expenses and, therefore, net margins within our consolidated statement of cash flows.

We are exposed to credit risk as a result of entering into these arrangements. Credit risk is the potential loss resulting from a counterparty's nonperformance under an agreement. We have established policies and procedures to manage credit risk through counterparty analysis, exposure calculation and monitoring, exposure limits, collateralization and certain other contractual provisions.

It is possible that volatility in commodity prices could cause us to have credit risk exposures with one or more counterparties. If such counterparties fail to perform their obligations, we could suffer a financial loss. However, as of March 31, 2022, all of the counterparties with transaction amounts outstanding under our derivative programs are rated investment grade by the major rating agencies or have provided a guaranty from one of their affiliates that is rated investment grade.

We have entered into International Swaps and Derivatives Association agreements with our natural gas derivative counterparties that mitigate credit exposure by creating contractual rights relating to creditworthiness, collateral, termination and netting (which, in certain cases, allows us to use the net value of affected transactions with the same counterparty in the event of default by the counterparty or early termination of the agreement).

Additionally, we have implemented procedures to monitor the creditworthiness of our counterparties and to evaluate nonperformance in valuing counterparty positions. We have contracted with a third party to assist in monitoring certain of our counterparties' credit standing and condition. Net liability positions are generally not adjusted as we use derivative transactions as hedges and have the ability and intent to perform under each of our contracts. In the instance of net asset positions, we consider general market conditions and the observable financial health and outlook of specific counterparties, forward looking data such as credit default swaps, when available, and historical default probabilities from credit rating agencies in evaluating the potential impact of nonperformance risk to derivative positions.

The contractual agreements contain provisions that could require us or the counterparty to post collateral or credit support. The amount of collateral or credit support that could be required is calculated as the difference between the aggregate fair value of the hedges and pre-established credit thresholds. The credit thresholds are contingent upon each party's credit ratings from the major credit rating agencies. The collateral and credit support requirements vary by contract and by counterparty.

Under the natural gas swap arrangements, we pay the counterparty a fixed price for specified natural gas quantities and receive a payment for such quantities based on a market price index. These payment obligations are netted, such that if the market price index is lower than the fixed price, we will make a net payment, and if the market price index is higher than the fixed price, we will receive a net payment.

At March 31, 2022 and December 31, 2021, the estimated fair values of our natural gas contracts were net assets of approximately $173,946,000 and $63,994,000, respectively.

As of March 31, 2022, four of our counterparties were required to post credit collateral totaling $39,200,000 under our natural gas swap agreements. As of December 31, 2021, one of our counterparties was required to post credit collateral totaling $1,800,000 under our natural gas swap agreements. Such collateral is classified as restricted cash and included in the Restricted cash and investments line items within our unaudited consolidated balance sheets.

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The following table reflects the notional volume of our natural gas derivatives as of March 31, 2022 that is expected to settle or mature each year:

Year	Natural Gas Swaps (MMBTUs)  (in millions)
2022	21.6
2023	26.8
2024	25.3
2025	21.2
2026	16.0
2027	0.9
Total	111.8

The table below reflects the fair value of derivative instruments and their effect on our consolidated balance sheets at March 31, 2022 and December 31, 2021.

	Balance Sheet Location	Fair Value
		2022		2021
		(dollars in thousands)
Assets:
Natural gas swaps	Other current assets	$	74,299	$	23,596
Natural gas swaps	Other deferred charges	$	99,647	$	40,398
Liabilities:
Natural gas swaps	Other current liabilities	$	—	$	—
Natural gas swaps	Other deferred credits	$	—	$	—

The following table presents the gross realized gains and (losses) on derivative instruments recognized in net margins for the three months ended March 31, 2022 and 2021.

	Statement of Revenues and Expenses Location	Three Months Ended March 31,
		2022		2021
		(dollars in thousands)
Natural gas swaps gains	Fuel	$	8,078	$	101
Natural gas swaps losses	Fuel	(79)		(1,244)
Total		$	7,999	$	(1,143)

The following table presents the unrealized gains on derivative instruments deferred on the balance sheet at March 31, 2022 and December 31, 2021.

	Balance Sheet Location	2022		2021
		(dollars in thousands)
Natural gas swaps	Regulatory liability	$	173,946	$	63,994
Total		$	173,946	$	63,994

(D)Investment Securities.    Investment securities we hold are recorded at fair value in the accompanying consolidated balance sheets. We apply regulated operations accounting to the unrealized gains and losses of all investment securities. All realized and unrealized gains and losses are determined using the specific identification method.

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The following tables summarize debt and equity securities as of March 31, 2022 and December 31, 2021.

	Gross Unrealized
	(dollars in thousands)
March 31, 2022	Cost		Gains		Losses		Fair Value
Equity	$	310,055	$	236,875	$	(4,239)	$	542,691
Debt	792,554		446		(24,757)		768,243
Other	7,134		—		—		7,134
Total	$	1,109,743	$	237,321	$	(28,996)	$	1,318,068

	Gross Unrealized
	(dollars in thousands)
December 31, 2021	Cost		Gains		Losses		Fair Value
Equity	$	304,305	$	280,127	$	(4,682)	$	579,750
Debt	774,580		4,859		(7,001)		772,438
Other	19,102		—		(1)		19,101
Total	$	1,097,987	$	284,986	$	(11,684)	$	1,371,289

(E)Recently Issued or Adopted Accounting Pronouncements.   In March 2020, the Financial Accounting Standards Board (FASB) issued “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting”. The amendments in this update apply to all entities that have contracts, hedging relationships, and other transactions that reference London Interbank Offered Rate (LIBOR) or another reference rate expected to be discontinued because of reference rate reform. The amendments in this update provide optional expedients and exceptions for applying U.S. GAAP to transactions affected by reference rate reform if certain criteria are met. The expedients and exceptions provided by the amendments in this update do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship.

In January 2021, the FASB issued “Reference Rate Reform (Topic 848): Scope,” to further clarify the scope of the reference rate reform guidance in Topic 848. The amendments in this update refine the scope of Topic 848 to clarify that certain optional expedients and exceptions therein for contract modifications and hedge accounting apply to contracts that are affected by the discounting transition. Specifically, modifications related to reference rate reform would not be considered an event that requires reassessment of previous accounting conclusions. The amendments in this update also amend the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition.

The amendments in these updates are effective for all entities as of March 12, 2020 through December 31, 2022. We have fully completed our evaluation of this new standard and we do not expect this standard will have a material impact on our consolidated financial statements.

(F)Revenue Recognition.    As an electric membership cooperative, our principal business is providing wholesale electric service to our members. Our operating revenues are derived primarily from wholesale power contracts we have with each of our 38 members. These contracts, which extend to December 31, 2050, are substantially identical and obligate our members jointly and severally to pay all expenses associated with owning and operating our power supply business. As a cooperative, we operate on a not-for-profit basis and, accordingly, seek only to generate revenues sufficient to recover our cost of service and to generate margins sufficient to establish reasonable reserves and meet certain financial coverage requirements. We also have short-term energy sales to non-members made through industry standard contracts. We do not have multiple operating segments.

Pursuant to our contracts, we primarily provide two services, capacity and energy. Capacity and energy revenues are recognized by us upon transfer of control of promised services to our members and non-members in an amount that reflects the consideration we expect to receive in exchange for those services. Capacity and energy are distinct and we account for them as separate performance obligations. The obligations to provide capacity and energy are satisfied over time as the customer simultaneously receives and consumes the benefit of these services. Both performance obligations are provided directly by us and not through a third party.

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Each of our members is obligated to pay us for capacity and energy we furnish under the wholesale power contract in accordance with rates we establish. We review our rates periodically but are required to do so at least once every year. Revenues from our members are derived through a cost-plus rate structure which is set forth as a formula in the rate schedule to the wholesale power contracts. The formulary rate provides for the pass-through of our (i) fixed costs (net of any income from other sources) plus a targeted margin as capacity revenues and (ii) variable costs as energy revenues from our members. Power purchase and sale agreements between us and non-members obligate each non-member to pay us for capacity, if any, and energy furnished in accordance with the prices mutually agreed upon. Margins produced from non-member sales are included in our rate schedule formula and reduce revenue requirements from our members. As of March 31, 2022 and December 31, 2021, we did not have any long-term contracts with non-members.

The consideration we receive for providing capacity services is determined by our formulary rate on an annual basis. The components of the formulary rate associated with capacity costs include the annual budget of fixed costs, a targeted margin and income from other sources. Capacity revenues, therefore, vary to the extent these components vary. Fixed costs include items such as fixed operation and maintenance expenses, administrative and general expenses, depreciation and interest. Year to year, capacity revenue fluctuations are generally due to the recovery of fixed operation and maintenance expenses. Fixed costs also include certain costs, such as major maintenance costs, which will be recognized as expense in future periods. Recognition of revenues associated with these future expenses is deferred pursuant to Accounting Standards Codification (ASC) 980, Regulated Operations. The regulatory liabilities are amortized to revenue in accordance with the associated revenue deferral plan as the expenses are recognized. For information regarding regulatory accounting, see Note J.

Capacity revenues are recognized by us for standing ready to deliver electricity to our customers. Our capacity revenues are based on the associated costs we expect to recover in a given year and are generally recognized and billed to our members in equal monthly installments over the course of the year regardless of whether our generation and purchased power resources are dispatched to produce electricity. Non-member capacity revenues, if any, are typically billed and recognized in equal monthly installments over the term of the contract.

We have a power bill prepayment program pursuant to which our members may prepay future capacity costs and receive a discount. As this program provides us with financing, we adjust our capacity revenues by the amount of the discount, which is based on our avoided cost of borrowing. For additional information regarding our member prepayment program, see Note K.

We satisfy our performance obligations to deliver energy as energy is delivered to the applicable meter points. We determine the standard selling price for energy we deliver to our members based upon the variable costs incurred to generate or purchase that energy. Fuel expense is the primary variable cost. Energy revenue recognized equals the actual variable expenses incurred in any given accounting period. Our member energy revenues fluctuate from period to period based on several factors, including fuel costs, weather and other seasonal factors, load requirements in our members' service territories, variable operating costs, the availability of electric generation resources, our decisions of whether to dispatch our owned or purchased resources or member-owned resources over which we have dispatch rights, and by members' decisions of whether to purchase a portion of their hourly energy requirements from our resources or from other suppliers. For the three-month periods ended March 31, 2022 and 2021, we provided approximately 57% and 55% of our members' energy requirements, respectively. The standard selling price for our energy revenues from non-members is the price mutually agreed upon.

We are required under our first mortgage indenture to produce a margins for interest ratio of at least 1.10 for each fiscal year. For 2022, our board has approved a targeted margins for interest ratio of 1.14. Historically, our board of directors has approved adjustments to revenue requirements by year end such that revenue in excess of that required to meet the targeted margins for interest ratio is refunded to the members. Given that our capacity revenues are based upon budgeted expenditures and generally recognized and billed to our members in equal monthly installments over the course of the year, we may recognize capacity revenues that exceed our actual fixed costs and targeted margins in any given interim reporting period. At each interim reporting period we assess our projected revenue requirements through year end to determine whether a refund to our members of excess consideration is likely. If so, we reduce our capacity revenues and recognize a refund liability to our members. Refund liabilities, if any, are included in accounts payable on our consolidated balance sheets. As of March 31, 2022 and March 31, 2021, we did not recognize a refund liability for either period. Based on our current agreements with non-members, we do not refund any consideration received from non-members.

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Sales to members for the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022			2021
Capacity revenues	$	243,291		$	255,824
Energy revenues	174,158			120,448
Total	$	417,449		$	376,272
Member energy requirements supplied	57		%	55		%

Receivables from contracts with our members at March 31, 2022 and December 31, 2021 were $137,121,000 and $143,715,000, respectively.

Sales to non-members during the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022		2021
Energy revenues	$	2,993	$	59

Receivables from non-member energy sales at March 31, 2022 and December 31, 2021 were $2,095,000 and $302,000, respectively.

Energy revenues from non-members for the three months ended March 31, 2022 were primarily from the sale of a portion of the energy output at Effingham, which we acquired in July 2021, into the wholesale market. For additional information regarding the Effingham acquisition, see Note 13 in our 2021 Form 10-K. There were no capacity revenues to non-members for the three months ended March 31, 2022 and 2021.

Electric capacity and energy revenues are recognized by us without any obligation for returns, warranties or taxes collected. As our members are jointly and severally obligated to pay all expenses associated with owning and operating our power supply business and we perform an on-going assessment of the credit worthiness of non-members and have not had a history of any write-offs from non-members, we have not recorded an allowance for doubtful accounts associated with our receivables from members or non-members.

We have a rate management program that allows us to expense and recover interest costs associated with the construction of Vogtle Units No. 3 and No. 4, on a current basis, that would otherwise be deferred or capitalized. The subscribing members of Vogtle Units No. 3 and No. 4 can elect to participate in this program on an annual basis. Under this program, amounts billed to participating members during the three months ended March 31, 2022 and 2021 were $3,861,000 and $3,857,000, respectively. The cumulative amount billed since inception of the program totaled $115,497,000.

In 2018, we began an additional rate management program that allows us to recover future expense on a current basis from our members. In general, the program allows for additional collections over a five-year period with those amounts then applied to billings over the subsequent five-year period. The program is designed primarily as a mechanism to assist our members in managing the rate impacts associated with the commercial operation of the new Vogtle units. During the first quarter of 2022, we began applying billing credits to some of our participating members within this program. Under this program, amounts billed to participating members, net of billing credits, during the three months ended March 31, 2022, and 2021 were $2,944,000 and $40,044,000, respectively. Funds collected through this program are invested and held until applied to members' bills. In conjunction with this program, we are applying regulated operations accounting to defer these revenues and related investment income on the funds collected. Amounts deferred under the program will be amortized to income when applied to members' bills. The net cumulative amount billed, since inception of the program totaled $360,272,000.

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(G)Leases.    As a lessee, we have a relatively small portfolio of leases with the most significant being our 60% undivided interest in Scherer Unit No. 2 and railcar leases for the transportation of coal. We also have various other leases of minimal value.

We classify our four Scherer Unit No. 2 leases as finance leases and our railcar leases as operating leases. We have made an accounting policy election not to recognize right-of-use assets and lease liabilities that arise from short-term leases, leases having an initial term of 12 months or less, for any class of underlying asset. We recognize lease expense for short-term leases on a straight-line basis over the lease term. Lease expense recognized for our short-term leases during the three months ended March 31, 2022 and 2021 was insignificant.

Finance Leases

Three of our Scherer Unit No. 2 finance leases have lease terms through December 31, 2027, and one lease extends through June 30, 2031. At the end of the leases, we can elect at our sole discretion to:

•Renew the leases for a period of not less than one year and not more than five years at fair market value,

•Purchase the undivided interest at fair market value, or

•Redeliver the undivided interest to the lessors.

For rate-making purposes, we include the actual lease payments for our finance leases in our cost of service. The difference between lease payments and the aggregate of the amortization on the right-of-use asset and the interest on the finance lease obligation is recognized as a regulatory asset. Finance lease amortization is recorded in depreciation and amortization expense.

Operating Leases

Our railcar operating leases have terms that extend through March 16, 2024. At the end of the railcar operating leases, we can renew at terms mutually agreeable by us and the lessors, purchase the assets or return the assets to the lessors. We have an additional operating lease that has a term that extends through February 2042 with one renewal option for a 20 year term.

The exercise of renewal options for our finance and operating leases is at our sole discretion.

As all of our operating leases do not provide an implicit rate, we use an incremental borrowing rate based on the information available at the time new lease agreements are entered into or reassessed to determine the present value of lease payments.

For lease agreements entered into or reassessed after the adoption of the new leases standard, we combine lease and nonlease components.

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Finance leases
Right-of-use assets	$	302,732	$	302,732
Less: Accumulated provision for depreciation	(268,923)		(267,606)
Total finance lease assets	$	33,809	$	35,126
Lease liabilities—Finance leases
Obligations under finance leases	$	61,335	$	61,335
Long-term debt and finance leases due within one year	7,541		7,541
Total finance lease liabilities	$	68,876	$	68,876

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Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Operating leases
Electric plant in service, net	$	2,086	$	2,293
Total operating lease assets	$	2,086	$	2,293
Lease liabilities—Operating leases
Capitalization—Other	$	1,301	$	1,550
Other current liabilities	798		838
Total operating lease liabilities	$	2,099	$	2,388

		Three months ended
Lease Cost	Classification	March 31, 2022		March 31, 2021
		(dollars in thousands)
Finance lease cost:
Amortization of leased assets	Depreciation and amortization	$	1,885	$	1,516
Interest on lease liabilities	Interest expense	1,852		2,044
Operating lease cost:	Inventory(1) & production expense	222		270
Total leased cost		$	3,959	$	3,830

(1) The majority of our operating lease costs relate to our railcar leases and such costs are added to the cost of our fossil-fuel inventories and are recognized in fuel expense as the inventories are consumed.

	March 31, 2022		December 31, 2021
Lease Term and Discount Rate:
Weighted-average remaining lease term (in years)
Finance leases	6.65		6.90
Operating leases	8.60		8.01
Weighted-average discount rate:
Finance leases	11.05	%	11.05	%
Operating leases	4.84	%	4.73	%

	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Other Information:
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	303	$	351
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	—

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Maturity analysis of our finance and operating lease liabilities as of March 31, 2022 is as follows:

	(dollars in thousands)
Year Ending December 31,	Finance Leases		Operating Leases		Total
2022	$	14,949	$	626	$	15,575
2023	14,949		708		15,657
2024	14,949		234		15,183
2025	14,949		72		15,021
2026	14,949		72		15,021
Thereafter	25,633		940		26,573
Total lease payments	$	100,378	$	2,652	$	103,030
Less: imputed interest	(31,502)		(553)		(32,055)
Present value of lease liabilities	$	68,876	$	2,099	$	70,975

As a lessor, we primarily lease office space to several tenants within our headquarters building. Several of these tenants are related parties. We account for all of these lease agreements as operating leases.

Lease income recognized during the three months ended March 31, 2022 and 2021 was as follows:

	Three Months Ended March 31,
	2022		2021
	(dollars in thousands)
Lease income	$	1,645	$	1,597

(H)Contingencies and Regulatory Matters.    We do not anticipate that the liabilities, if any, for any current proceedings against us will have a material effect on our financial condition or results of operations. However, at this time, the ultimate outcome of any pending or potential litigation cannot be determined.

Environmental Matters.    As is typical for electric utilities, we are subject to various federal, state and local environmental laws which represent significant future risks and uncertainties. Air emissions, water discharges and water usage are extensively controlled, closely monitored and periodically reported. Handling and disposal requirements govern the manner of transportation, storage and disposal of various types of waste. We may also become subject to climate change regulations that impose restrictions on emissions of greenhouse gases, including carbon dioxide.

Such requirements may substantially increase the cost of electric service, by requiring modifications in the design or operation of existing facilities or the purchase of emission allowances. Failure to comply with these requirements could result in civil and criminal penalties and could include the complete shutdown of individual generating units not in compliance. Certain of our debt instruments require us to comply in all material respects with laws, rules, regulations and orders imposed by applicable governmental authorities, which include current and future environmental laws or regulations. Should we fail to be in compliance with these requirements, it would constitute a default under those debt instruments. We believe that we are in compliance with those environmental regulations currently applicable to our business and operations. Although it is our intent to comply with current and future regulations, we cannot provide assurance that we will always be in compliance.

At this time, the ultimate impact of any potential new and more stringent environmental regulations described above is uncertain and could have an effect on our financial condition, results of operations and cash flows as a result of future additional capital expenditures and increased operations and maintenance costs.

Additionally, litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as air quality and water standards, has increased generally throughout the United States. In particular, personal injury and other claims for damages caused by alleged exposure to hazardous materials, and common law nuisance claims for injunctive relief, personal injury and property damage allegedly caused by coal combustion residue, greenhouse gas and other emissions have become more frequent.

In July 2020, a group of individual plaintiffs filed a complaint in the Superior Court of Fulton County, Georgia against Georgia Power alleging that releases from Plant Scherer, of which we are a co-owner, have impacted groundwater, surface water, and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. Georgia

17

Power has filed multiple motions to dismiss the complaint. On October 8, 2021, three additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer, have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages. On November 11, 2021, Georgia Power filed a notice to remove the three cases pending in the Superior Court of Monroe County to the U.S. District Court in the Middle District of Georgia. On February 7, 2022, four additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power seeking damages for alleged personal injuries or property damage. On March 9, 2022, Georgia Power filed notices to remove the four additional cases pending in the Superior Court of Monroe County to the U.S. District Court in the Middle District of Georgia. Collectively, these cases include approximately 70 plaintiffs. The amount of any possible losses from these matters cannot be estimated at this time.

In May 2022, Florida Power & Light Company and JEA filed a complaint in the U.S. District Court for the Northern District of Georgia against us and the other co-owners of Plant Scherer alleging that their contractual responsibility for a proportionate share of certain common facility costs relating to future environmental projects at Plant Scherer should be decreased following the retirement of Scherer Unit No. 4 at the end of 2021. While we do not believe that the co-ownership agreements support the arguments raised by Florida Power & Light Company and JEA, if their arguments were to be successful in this case, we could be responsible for an increased percentage of these costs relating to our interests in Scherer Unit Nos. 1 and 2. The amount of additional costs relating to these future projects, if any, cannot be determined at this time.

(I)Restricted Cash and Investments.    Restricted investments consist of funds on deposit with the Rural Utilities Service in the Cushion of Credit Account that are held by the U.S. Treasury, acting through the Federal Financing Bank. We can only utilize these investments for future Rural Utilities Service-guaranteed Federal Financing Bank debt service payments. For the period from January 1, 2021 to September 30, 2021, deposits earned interest at 4% per annum. Beginning October 1, 2021, the rate was set at the 1-year floating treasury rate, which was 0.09% per annum, and will be reset annually on October 1 of each year thereafter. The program no longer allows additional funds to be deposited into the account. At March 31, 2022 and December 31, 2021, we had restricted investments totaling $196,820,000 and $320,052,000, respectively, of which $196,820,000 and $246,350,000, respectively, were classified as current.

Restricted cash consists of collateral posted by our counterparties under our natural gas swap agreements. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the unaudited consolidated balance sheets that sum to the total of the same such amounts reported in the unaudited consolidated statements of cash flows.

Classification
	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Cash and cash equivalents	$	467,353	$	561,101
Restricted cash included in Restricted cash and investments	39,200		—
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$	506,553	$	561,101

(J)Regulatory Assets and Liabilities.    We apply the accounting guidance for regulated operations. Regulatory assets represent certain costs that are probable of recovery through future rates. We expect to recover such costs from our members in future revenues through rates under the wholesale power contracts we have with each of our members. The wholesale power contracts extend through December 31, 2050. Regulatory liabilities represent certain items of income that we are retaining and that will be applied in the future to reduce revenues required to be recovered from our members.

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The following regulatory assets and liabilities are reflected on the consolidated balance sheets as of March 31, 2022 and December 31, 2021.

	2022		2021
	(dollars in thousands)
Regulatory Assets:
Premium and loss on reacquired debt(a)	$	32,199	$	33,200
Amortization of financing leases(b)	33,611		34,179
Outage costs(c)	45,834		31,956
Asset retirement obligations—Ashpond and other(l)	340,209		335,231
Depreciation expense - Plant Vogtle(d)	36,617		36,973
Depreciation expense - Plant Wansley(e)	260,463		204,891
Deferred charges related to Vogtle Units No. 3 and No. 4 training costs(f)	55,105		55,857
Interest rate options cost(g)	132,756		131,556
Deferral of effects on net margin—Smith Energy Facility(h)	141,189		142,675
Other regulatory assets(o)	10,147		2,272
Total Regulatory Assets	$	1,088,130	$	1,008,790
Regulatory Liabilities:
Accumulated retirement costs for other obligations(i)	$	22,371	$	22,197
Deferral of effects on net margin—Hawk Road Energy Facility(h)	17,098		17,253
Major maintenance reserve(j)	81,492		73,059
Amortization of financing leases(b)	7,732		8,457
Deferred debt service adder(k)	142,817		138,897
Asset retirement obligations—Nuclear(l)	97,746		164,256
Revenue deferral plan(m)	353,433		359,799
Natural gas hedges(n)	173,946		63,994
Other regulatory liabilities(o)	1,460		1,537
Total Regulatory Liabilities	$	898,095	$	849,449
Net Regulatory Assets	$	190,035	$	159,341

(a)Represents premiums paid, together with unamortized transaction costs related to reacquired debt that are being amortized over the lives of the refunding debt, which range up to 22 years.

(b)Represents the difference between expense recognized for rate-making purposes versus financial statement purposes related to finance lease payments and the aggregate of the amortization of the asset and interest on the obligation.

(c)Consists of both coal-fired maintenance and nuclear refueling outage costs. Coal-fired outage costs are amortized on a straight-line basis to expense over periods up to 60 months, depending on the operating cycle of each unit. Nuclear refueling outage costs are amortized on a straight-line basis to expense over the 18 or 24-month operating cycles of each unit.

(d)Prior to Nuclear Regulatory Commission (NRC) approval of a 20-year license extension for Plant Vogtle, we deferred the difference between Plant Vogtle depreciation expense based on the then 40-year operating license and depreciation expense assuming an expected 20-year license extension. Amortization commenced upon NRC approval of the license extension in 2009 and is being amortized over the remaining life of the plant.

(e)Represents the deferral of accelerated depreciation associated with the early retirement of Plant Wansley, which is expected by the end of August 2022. Amortization will commence upon retirement of Plant Wansley and end no later than December 31, 2040.

(f)Deferred charges consist of training related costs, including interest and carrying costs of such training. Amortization will commence effective with the commercial operation date of each unit and amortized to expense over the life of the units.

(g)Deferral of premiums paid to purchase interest rate options used to hedge interest rates on certain borrowings, related carrying costs and other incidentals associated with construction of Vogtle Units No. 3 and No. 4. Amortization will commence when Vogtle Unit No. 3 is placed in service.

(h)Effects on net margin for Smith and Hawk Road Energy Facilities were deferred through the end of 2015 and are being amortized over the remaining life of each respective plant.

(i)Represents the accrual of retirement costs associated with long-lived assets for which there are no legal obligations to retire the assets.

(j)Represents collections for future major maintenance costs; revenues are recognized as major maintenance costs are incurred.

(k)Represents collections to fund certain debt payments to be made through the end of 2025 which will be in excess of amounts collected through depreciation expense; the deferred credits will be amortized over the remaining useful life of the plants.

(l)Represents the difference in the timing of recognition of decommissioning costs for financial statement purposes versus ratemaking purposes, as well as the deferral of unrealized gains and losses of funds set aside for decommissioning.

(m)Deferred revenues under a rate management program that allows for additional collections over a five-year period which began in 2018. These amounts will be amortized to income and applied to member billings over the subsequent five-year period.

(n)Represents the deferral of unrealized gains on natural gas hedges.

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(o)The amortization periods for other regulatory assets range up to 28 years and the amortization periods of other regulatory liabilities range up to 5 years.

(K)Member Power Bill Prepayments.    We have a power bill prepayment program pursuant to which members can prepay their power bills from us at a discount based on our avoided cost of borrowing. The prepayments are credited against the participating members' power bills in the month(s) agreed upon in advance. The discounts are credited against the power bills and are recorded as a reduction to member revenues. The prepayments are being credited against members' power bills through December 2026, with the majority of the balance scheduled to be credited by the end of 2023.

(L)Debt.

a)Department of Energy Loan Guarantee:

Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005, we and the U.S. Department of Energy, acting by and through the Secretary of Energy, entered into a Loan Guarantee Agreement on February 20, 2014 pursuant to which the Department of Energy agreed to guarantee our obligations under a Note Purchase Agreement, dated as of February 20, 2014 (the Original Note Purchase Agreement), among us, the Federal Financing Bank and the Department of Energy and two future advance promissory notes, each dated February 20, 2014, made by us to the Federal Financing Bank in the aggregate amount of $3,057,069,461 (the Original FFB Notes and together with the Original Note Purchase Agreement, the Original FFB Documents).

On March 22, 2019, we and the Department of Energy entered into an Amended and Restated Loan Guarantee Agreement (as amended, the Loan Guarantee Agreement) which increased the aggregate amount guaranteed by the Department of Energy to $4,676,749,167. We also entered into a Note Purchase Agreement dated as of March 22, 2019 (the Additional Note Purchase Agreement), among us, the Federal Financing Bank and the Department of Energy and a future advance promissory note, dated March 22, 2019, made by us to the Federal Financing Bank in the amount of $1,619,679,706 (the Additional FFB Note and together with the Additional Note Purchase Agreement, the Additional FFB Documents).

Together, the Original FFB Documents and Additional FFB Documents provide for a multi-advance term loan facility (the Facility) under which we may make long-term loan borrowings through the Federal Financing Bank.

Proceeds of advances made under the Facility are used to reimburse us for a portion of certain costs of construction relating to Vogtle Units No. 3 and No. 4 that are eligible for financing under the Title XVII loan guarantee program (Eligible Project Costs). Borrowings under the Original FFB Notes could not exceed $3,057,069,461, of which $335,471,604 was designated for capitalized interest. We have advanced all amounts available under the Original FFB Notes. We were unable to advance $43,721,079 of the amount designated for capitalized interest under the Original FFB Notes due to timing of borrowing and lower than expected interest rates.

Borrowings under the Additional FFB Note may not exceed (i) $1,619,679,706 or (ii) an amount that, when aggregated with borrowings under the Original FFB Notes, equals 70% of Eligible Project Costs less the $1,104,000,000 guarantee payment we received from Toshiba Corporation in late 2017. At March 31, 2022, borrowings under the Additional FFB Note totaled $1,094,000,000.

At March 31, 2022, aggregate Department of Energy-guaranteed borrowings, including capitalized interest, totaled $4,107,348,382.

Under the Loan Guarantee Agreement, we are obligated to reimburse the Department of Energy in the event it is required to make any payments to the Federal Financing Bank under its guarantee. Our payment obligations to the Federal Financing Bank under the FFB Notes and reimbursement obligations to the Department of Energy under its guarantee, but not our covenants to the Department of Energy under the Loan Guarantee Agreement, are secured equally and ratably with all of our other obligations issued under our first mortgage indenture. The final maturity date for each advance is February 20, 2044. Interest is payable quarterly in arrears and principal payments on all advances under the FFB Notes began on February 20, 2020. As of March 31, 2022, we have repaid $217,685,000 of principal on the FFB Notes. Interest rates on advances during the applicable interest rate periods will equal the current average yield on U.S. Treasuries of comparable maturity at the beginning of the interest rate period, plus a spread equal to 0.375%.

Future advances under the Facility are subject to satisfaction of customary conditions, as well as (i) certification of compliance with the requirements of the Title XVII loan guarantee program, (ii) accuracy of project-related representations and warranties, (iii) delivery of updated project-related information, (iv) no Project Adverse Event (as described in Note M) having occurred or, if a Project Adverse Event has occurred, that Co-owners (as described in Note M) representing at least 90% of the ownership interests have voted to continue construction, have not deferred

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construction and we have provided the Department of Energy with certain additional information, (v) certification regarding Georgia Power's compliance with certain obligations relating to the Cargo Preference Act, as amended, (vi) evidence of compliance with the applicable wage requirements of the Davis-Bacon Act, as amended, (vii) certification from the Department of Energy's consulting engineer that proceeds of the advance are used to reimburse Eligible Project Costs and (viii) if either the Services Agreement or the Bechtel Agreement (each, as described in Note M) are terminated, or rejected in bankruptcy proceedings, the Department of Energy has approved the replacement agreement.

We may voluntarily prepay outstanding borrowings under the Facility. Under the FFB Documents, any prepayment will be subject to a make-whole premium or discount, as applicable. Any amounts prepaid may not be re-borrowed.

Under the Loan Guarantee Agreement, we are subject to customary borrower affirmative and negative covenants and events of default. In addition, we are subject to project-related reporting requirements and other project-specific covenants and events of default.

If certain events occur, referred to as an "Alternate Amortization Event," at the Department of Energy's option the Federal Financing Bank's commitment to make further advances under the Facility will terminate and we will be required to repay the outstanding principal amount of all borrowings under the Facility over a period of five years, with level principal amortization. These events include (i) abandonment of the Vogtle Units No. 3 and No. 4 project, including a decision by Georgia Power to cancel the project, (ii) cessation of the construction of Vogtle Units No. 3 and No. 4 for twelve consecutive months, (iii) termination of the Services Agreement or rejection of the Services Agreement in bankruptcy, if Georgia Power does not maintain access to certain related intellectual property rights, (iv) termination of the Services Agreement by Westinghouse or termination of the Bechtel Agreement by Bechtel Power Corporation, (v) delivery of certain notices by the Co-owners to the Department of Energy of their intent to cancel construction of Vogtle Units No. 3 and No. 4 coupled with termination by the Co-owners of the Services Agreement or the Bechtel Agreement, (vi) failure of the Co-owners to enter into a replacement contract with respect to the Services Agreement or the Bechtel Agreement following the Co-owners' termination of such agreement with the intent to replace it, (vii) the Department of Energy's takeover of construction of Vogtle Units No. 3 and No. 4 under certain conditions, (viii) the occurrence of any Project Adverse Event that results in a cancellation of the Vogtle Units No. 3 and No. 4 project or the cessation or deferral of construction beyond the periods permitted under the Loan Guarantee Amendment, (ix) loss of or failure to receive necessary regulatory approvals under certain circumstances, (x) loss of access to intellectual property rights necessary to construct or operate Vogtle Units No. 3 and No. 4 under certain circumstances, (xi) our failure to fund our share of operation and maintenance expenses for Vogtle Units No. 3 and No. 4 for twelve consecutive months, (xii) change of control of Oglethorpe and (xiii) certain events of loss or condemnation. If we receive proceeds from an event of condemnation relating to Vogtle Units No. 3 and No. 4, such proceeds must be applied to immediately prepay outstanding borrowings under the Facility.

b)Rural Utilities Service Guaranteed Loans:

For the three-month period ended March 31, 2022, we received advances on Rural Utilities Service-guaranteed Federal Financing Bank loans totaling $30,185,000 for long-term financing of general and environmental improvements at existing plants.

In April 2022, we received an additional $22,318,000 in advances on Rural Utilities Service-guaranteed Federal Financing Bank loans for long-term financing of general and environmental improvements at existing plants.

c)First Mortgage Bonds:

On April 12, 2022, we issued $500,000,000 of 4.50% first mortgage bonds, Series 2022A, for the purpose of providing long-term financing for expenditures related to the construction of Vogtle Units No. 3 and No. 4. In conjunction with the issuance of the bonds, we repaid $493,405,000 of outstanding commercial paper, which was classified as long-term debt at March 31, 2022. The bonds are due to mature April 2047 and are secured under our first mortgage indenture.

(M)Vogtle Units No. 3 and No. 4 Construction Project.  We, Georgia Power, the Municipal Electric Authority of Georgia, and the City of Dalton, Georgia, acting by and through its Board of Water, Light and Sinking Fund Commissioners, doing business as Dalton Utilities (collectively, the Co-owners) are parties to an Ownership Participation Agreement that, along with other agreements, governs our participation in two additional nuclear units under construction at Plant Vogtle, Units No. 3 and No. 4. The Co-owners appointed Georgia Power to act as agent under this agreement. Our ownership interest and proportionate share of the cost to construct these units is currently 30%, representing approximately 660 megawatts. Pursuant to this agreement, Georgia Power has designated Southern Nuclear Operating

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Company, Inc. as its agent for licensing, engineering, procurement, contract management, construction and pre-operation services.

In 2008, Georgia Power, acting for itself and as agent for the Co-owners, entered into an Engineering, Procurement and Construction Agreement (the EPC Agreement) with Westinghouse Electric Company LLC and Stone & Webster, Inc., which was subsequently acquired by Westinghouse and changed its name to WECTEC Global Project Services Inc. (collectively, Westinghouse). Pursuant to the EPC Agreement, Westinghouse agreed to design, engineer, procure, construct and test two 1,100 megawatt nuclear units using the Westinghouse AP1000 technology and related facilities at Plant Vogtle.

Until March 2017, construction on Units No. 3 and No. 4 continued under the substantially fixed price EPC Agreement. In March 2017, Westinghouse filed for bankruptcy protection under Chapter 11 of the United States Bankruptcy Code. Effective in July 2017, Georgia Power, acting for itself and as agent for the other Co-owners, and Westinghouse entered into a services agreement (the Services Agreement), pursuant to which Westinghouse is providing facility design and engineering services, procurement and technical support and staff augmentation on a time and materials cost basis. The Services Agreement provides that it will continue until the start-up and testing of Vogtle Units No. 3 and No. 4 is complete and electricity is generated and sold from both units. The Services Agreement is terminable by the Co-owners upon 30 days' written notice.

In October 2017, Georgia Power, acting for itself and as agent for the other Co-owners, entered into a construction completion agreement with Bechtel Power Corporation, pursuant to which Bechtel serves as the primary contractor for the remaining construction activities for Vogtle Units No. 3 and No. 4 (the Bechtel Agreement). The Bechtel Agreement is a cost reimbursable plus fee arrangement, whereby Bechtel is reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Co-owner is severally, and not jointly, liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Co-owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Co-owners will be required to pay amounts related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Co-owner suspensions of work, certain breaches of the Bechtel Agreement by the Co-owners, Co-owner insolvency and certain other events.

Cost and Schedule

Our current budget for our 30% ownership interest in Vogtle Units No. 3 and No. 4, which includes capital costs, allowance for funds used during construction, our allocation of the project-level contingency and a separate Oglethorpe-level contingency is $8.5 billion and is based on commercial operation dates of March 2023 and December 2023 for Units No. 3 and No. 4, respectively. At March 31, 2022, our total investment in the additional Vogtle units was approximately $7.2 billion. We and some of our members have implemented various rate management programs to lessen the impact on rates when Vogtle Units No. 3 and No. 4 reach commercial operation.

We and our members are currently evaluating exercising the tender option discussed below which would cap our capital costs described above in exchange for a proportionate reduction of our 30% interest in the two new units. Based on the current project budget and schedule and our interpretation of the Global Amendments (described below), if we decide to exercise the tender option, our budget would be $8.1 billion and we would transfer and release from the lien of the first mortgage indenture approximately 42 megawatts, out of 660 megawatts, to Georgia Power. Our resulting ownership share would decline from 30% to approximately 28%. However, if the total project budget exceeds the current budget, our ownership share and megawatts could be further reduced. In addition to requiring approval by our board, any decision regarding the tender option will require certain member approvals.

We have a budget contingency for our interest that is separate and in addition to the project-level contingency. The Oglethorpe-level contingency, which we have carried at various levels since the beginning of the project, provides additional margin to cover potential cost, schedule, and financing risks associated with our share of the project which may not be covered by project-level contingencies. As construction progresses, the Oglethorpe-level contingency may continue to fluctuate as it represents the difference between known project-level costs and contingencies and our total budget. At the end of the project, if there is remaining Oglethorpe-level contingency, we will adjust our project budget to remove this contingency and bill our members based on the actual project costs. The table below shows our project

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budgets and actual costs through March 31, 2022 for our share of the project.

	(in millions)
	Project Budget - No Tender		Project Budget - Tender		Actual Costs at March 31, 2022
Construction Costs (1)	$	6,487	$	6,096	$	5,621
Financing Costs	1,922		1,914		1,561
Total Costs	$	8,409	$	8,010	$	7,182
Project-Level Contingency	$	70	$	70	$	—
Oglethorpe-Level Contingency	21		20		—
Total Contingency	$	91	$	90	$	—
Totals	$	8,500	$	8,100	$	7,182
(1) Construction costs are net of $1.1 billion we received from Toshiba Corporation under a Guarantee Settlement Agreement.

If we do not exercise the tender option, any schedule extension beyond March 2023 and December 2023 for Units No. 3 and No. 4, respectively, is expected to impact our cost by approximately $75 million per month for both units and approximately $30 million per month for Unit No. 4 only, including financing costs. If we exercise the tender option, we expect each additional month of delay to increase our financing costs by approximately $30 million per month for both units and approximately $12 million per month for Unit No. 4.

As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts on a regular basis to incorporate current information available, particularly in the areas of engineering support, commodity installation, system turnovers and related test results and workforce statistics.

Since March 2020, the number of active cases of COVID-19 at the site has fluctuated consistent with the surrounding area and impacted productivity levels and pace of activity completion. COVID-19 has exacerbated the challenges facing the project, including, but not limited to, higher than expected absenteeism; overall construction and subcontractor labor productivity; system turnover and testing activities; and electrical equipment and commodity installation. As of March 31, 2022, the incremental cost associated with COVID-19 mitigation actions and impacts on construction productivity is estimated by Georgia Power to be between $350 million and $438 million (of which our 30% interest is $105 million to $131 million) and is included in the project budget. The continuing effects of the COVID-19 pandemic could further disrupt or delay construction, testing, supervisory, and support activities at Vogtle Units No. 3 and No. 4.

The Unit No. 3 projected schedule primarily depends on construction productivity and production levels, the volume and completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining inspection, tests, analyses and acceptance criteria and begin fuel load, the pace of system and area turnovers, and the progression of startup and other testing. Georgia Power has disclosed that it projects an in-service date for Unit No. 3 by the end of the first quarter of 2023. Our current budgets reflect our expectation of an in-service date for Unit No. 3 in March 2023.

Georgia Power has disclosed that it projects an in-service date for Unit No. 4 by the end of the fourth quarter 2023. Our current budgets anticipate an in-service date for Unit No. 4 in December 2023. Meeting the projected in-service date for Unit No. 4 primarily depends on overall construction productivity and production levels significantly improving as well as appropriate levels of craft laborers, particularly electricians and pipefitters, being added and maintained.

During the first quarter of 2022, Georgia Power assigned $95 million of established construction contingency and additional costs (of which our 30% share was $29 million) to the base capital costs forecast primarily associated with construction productivity, the pace of system turnovers, and support resources for Units No. 3 and No. 4. Georgia Power has stated its expectation to allocate the remainder of the project-level contingency by completion of the project.

As Unit No. 3 completes system turnover from construction and moves to testing and transition to operations, ongoing and potential future challenges include construction productivity, completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining inspections, tests, analyses, and acceptance criteria and begin fuel load, and final component and pre-operational tests. As Unit No. 4 progresses through construction and transitions into testing, ongoing and potential future challenges include the pace and quality of electrical installation; availability of craft and supervisory resources, including the

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temporary diversion of such resources to support Unit No. 3 construction efforts; and the pace of work package closures and system turnovers; and the timeframe and duration of hot functional and other testing. As construction, including subcontract work, continues on both Units No. 3 and No. 4, ongoing or future challenges include management of contractors and vendors; subcontractor performance; supervision of craft labor and related productivity, particularly in the installation of electrical, mechanical, and instrumentation and controls commodities, ability to attract and retain craft labor, and/or related cost escalation; and procurement and related installation. New challenges may arise, particularly as Units No. 3 and No. 4 move into initial testing and start-up, which may result in required engineering changes or remediation related to plant systems, structures or components (some of which are based on new technology that only within the last few years began initial operation in the global nuclear industry at this scale). The ongoing and potential future challenges described above may further impact the projected schedule and estimated cost.

There have been technical and procedural challenges to the construction and licensing of Vogtle Units No. 3 and No. 4 at the federal and state level and additional challenges may arise. In addition, certain license amendment requests have been filed and approved or are pending before the Nuclear Regulatory Commission. Processes are in place that are designed to ensure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the Nuclear Regulatory Commission that occur throughout construction. In connection with the additional construction remediation work described above, Southern Nuclear reviewed the project’s construction quality programs and, where needed, is implementing improvement plans consistent with these processes. On March 25, 2022, the Nuclear Regulatory Commission completed its follow up inspection related to the November 2021 final significance report on its special inspection to review the root cause of this additional construction remediation work and the corresponding corrective action plans. The Nuclear Regulatory Commission closed the findings identified in November 2021 and returned Unit No. 3 to the Nuclear Regulatory Commission’s baseline inspection program.

Various design and other licensing-based compliance matters, including the timely submittal by Southern Nuclear of the inspections, tests, analyses, and acceptance criteria documentation for each unit and the related reviews and approvals by the Nuclear Regulatory Commission necessary to support authorization to load fuel, have arisen and may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues, including inspections, tests, analyses, and acceptance criteria, are not resolved in a timely manner, there may be further delays in the project schedule that could result in increased costs to the Co-owners.

The ultimate outcome of these matters cannot be determined at this time.

Co-Owner Contracts and Other Information

In November 2017, the Co-owners entered into an amendment to their joint ownership agreements for Vogtle Units No. 3 and No. 4 to provide for, among other conditions, additional Co-owner approval requirements. These joint ownership agreements, including the Co-owner approval requirements, were subsequently amended, effective August 31, 2018. As described below, certain provisions of the Joint Ownership Agreements were modified further on September 26, 2018 by the Term Sheet that was memorialized on February 18, 2019 when the Co-owners entered into certain amendments (the Global Amendments) to the Joint Ownership Agreements (as amended, the Joint Ownership Agreements).

As a result of an increase in the total project capital cost forecast and Georgia Power’s decision not to seek recovery of its allocation of the increase in the base capital costs and the increased construction budget in connection with Georgia Power’s nineteenth Vogtle construction monitoring (VCM) report in 2018, the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 were required to vote to continue construction. In September 2018, the Co-owners unanimously voted to continue construction of Vogtle Units No. 3 and No. 4.

In connection with the September 2018 vote to continue construction, Georgia Power entered into a binding term sheet with the other Co-owners and MEAG’s wholly-owned subsidiaries MEAG Power SPVJ, LLC, MEAG Power SPVM, LLC, and MEAG Power SPVP, LLC to mitigate certain financial exposure for the other Co-owners and offered to purchase production tax credits from each of the other Co-Owners, at that Co-owner’s option (the Term Sheet). On February 18, 2019, the Co-owners entered into the Global Amendments to memorialize the provisions of the Term Sheet. Pursuant to the Global Amendments and consistent with the Term Sheet, the Joint Ownership Agreements provide that:

•each Co-owner is obligated to pay its proportionate share of construction costs for Vogtle Units No. 3 and No. 4 based on its ownership interest up to (i) the estimated cost at completion ("EAC") for Vogtle Units No. 3 and No. 4 which formed the basis of Georgia Power's forecast of $8.4 billion in Georgia Power's nineteenth VCM report filed with the Georgia Public Service Commission plus (ii) $800 million of additional construction costs;

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•Georgia Power will be responsible for 55.7% of construction costs, subject to exceptions such as costs that are a result of a force majeure event, that exceed the EAC in the nineteenth VCM report by $800 million to $1.6 billion (resulting in up to $80 million of potential additional costs to Georgia Power which would save Oglethorpe up to $44 million), with the remaining Co-owners responsible for 44.3% of such costs pro rata in accordance with their respective ownership interests (equal to 24.5% for our 30% ownership interest); and

•Georgia Power will be responsible for 65.7% of construction costs, subject to exceptions such as costs that are a result of a force majeure event, that exceed the EAC in the nineteenth VCM report by $1.6 billion to $2.1 billion (resulting in up to a further $100 million of potential additional costs to Georgia Power which would save Oglethorpe up to an additional $55 million), with the remaining Co-owners responsible for 34.3% of such costs pro rata in accordance with their respective ownership interests (equal to 19.0% for our 30% ownership interest).

If the EAC is revised and exceeds the EAC in the nineteenth VCM report by more than $2.1 billion, each of the Co-owners, other than Georgia Power, will have a one-time option to tender a portion of its ownership interest to Georgia Power in exchange for Georgia Power’s agreement to pay 100% of such Co-owner’s share of construction costs actually incurred in excess of the EAC in the nineteenth VCM report plus $2.1 billion. If any Co-owner elects to exercise this tender option, Georgia Power would have the option to cancel the project in lieu of accepting the offer to purchase a portion of the Co-owner’s ownership interest. If Georgia Power does not elect to cancel the project, then Georgia Power must accept the offer, and the ownership interest to be conveyed from the tendering Co-owner to Georgia Power will be calculated based on the percentage of the cumulative amount of construction costs paid by such tendering Co-owner as of the commercial operation date of Vogtle Unit No. 4. For purposes of this calculation, payments made by Georgia Power on behalf of the tendering Co-owner in accordance with the second and third bullets above will be treated as payments made by that Co-owner. This option to tender a portion of our interest to Georgia Power upon such a budget increase would allow us to freeze our construction budget associated with the Vogtle project in exchange for a proportionate reduction of our 30% ownership interest. In November 2021, Georgia Power and the other Co-owners clarified the process to exercise the tender option to require that a Co-owner desiring to exercise the tender option must do so between 120 and 180 days after the tender option is triggered.

The nineteenth VCM report total project cost is $17.1 billion (which excludes non-shareable costs) as reflected in numerous Georgia Public Service Commission filings. As of December 31, 2021, budget increases since the nineteenth VCM have reached $3.4 billion for all Co-owners. As a result of these increases, we believe that the tender option was triggered at the Co-owner construction budget vote on February 14, 2022 and that Georgia Power’s increased responsibility for certain construction costs as described above commenced in March 2022. Georgia Power and the other Co-owners do not agree on the dollar amount that triggers each Co-owner’s option to tender a portion of its ownership interest to Georgia Power under the tender option or the extent to which costs that are the result of a force majeure event (such as COVID-19) impact the point at which the tender option is triggered. For purposes of determining when the Co-owners’ option to tender has been triggered, the Global Amendments do not exclude costs resulting from force majeure events (such as COVID-19) from the calculation of when the EAC in the nineteenth VCM report plus $2.1 billion has been reached. Georgia Power and the other Co-owners also do not agree on the dollar amount that triggers Georgia Power’s increased responsibility for certain construction costs as described above, and the extent to which costs that are the result of a force majeure event (such as COVID-19), impact the calculation of the point at which Georgia Power’s increased responsibility for certain construction costs as described above is triggered. The exclusion of costs resulting from a force majeure event (such as COVID-19) in the Global Amendments only applies to Georgia Power’s increased cost responsibility during the time period when construction costs exceed the EAC in the nineteenth VCM report by $800 million to $2.1 billion. Accordingly, in March 2022, we notified Georgia Power of a billing dispute with regards to both the starting dollar amount and the application of costs resulting from a force majeure event and how such amounts impact the thresholds and timing of the cost-sharing and tender option provisions. This notice commenced the dispute resolution procedures set forth in the Ownership Participation Agreement for the additional Vogtle units.

Our ownership interest in Vogtle Units No. 3 and No. 4 continues to be 30%; however, this could decrease if we exercise our option to tender a portion of our ownership interest and require Georgia Power to pay 100% of the remaining share of the costs necessary to complete the units. Our decremental ownership interest would be calculated and conveyed to Georgia Power after both Vogtle units are placed in service. Based on the current project budget and on our interpretation of the Global Amendments, if we decide to exercise the tender option, we would transfer approximately 42 megawatts, out of 660 megawatts, to Georgia Power. Our resulting ownership share would decline from 30% to approximately 28%.

Pursuant to the Joint Ownership Agreements, as amended by the Global Amendments, the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 must vote to continue construction, or can vote to suspend construction, if certain adverse events occur, including: (i) the bankruptcy of Toshiba Corporation; (ii) termination or

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rejection in bankruptcy of certain agreements, including the Services Agreement, the Bechtel Agreement or the agency agreement with Southern Nuclear; (iii) Georgia Power publicly announces its intention not to submit for rate recovery any portion of its investment in Vogtle Units No. 3 and No. 4 (or associated financing costs) or the Georgia Public Service Commission determines that any of Georgia Power's costs relating to the construction of Vogtle Units No. 3 and No. 4 will not be recovered in retail rates, excluding any additional amounts paid by Georgia Power on behalf of the other Co-owners pursuant to the Global Amendment provisions described above and the first 6% of costs during any six-month VCM reporting period that are disallowed by the Georgia Public Service Commission for recovery, or for which Georgia Power elects not to seek cost recovery, through retail rates or (iv) an incremental extension of one year or more from the seventeenth VCM report estimated in-service dates of November 2021 and November 2022 for Units No. 3 and No. 4, respectively (each, a Project Adverse Event). The schedule extensions, announced in February 2022, which reflected a cumulative delay of over a year for each unit from the schedules approved in the seventeenth VCM report, triggered the requirement for the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 to vote to continue construction, and the Co-owners unanimously voted to continue construction.

The Global Amendments provide that Georgia Power may cancel the project at any time at its sole discretion. In the event that Georgia Power determines to cancel the project or fewer than 90% of the Co-owners vote to continue construction upon the occurrence of a subsequent project adverse event, we and the other Co-owners would assess our options for the Vogtle project. If the investment were to be written off, we would seek regulatory accounting treatment to amortize the investment over a long-term period, which requires the approval of our board of directors, and we would submit the regulatory accounting treatment details to the Rural Utilities Service for its approval. Further, if Georgia Power or the Co-owners decided to cancel the project, the Department of Energy would have the discretion to require that we repay all amounts outstanding under our loan guarantee agreement with the Department of Energy over a five-year period as discussed in Note L of Notes to Unaudited Consolidated Financial Statements.

The ultimate outcome of these matters cannot be determined at this time.

See “Item 1A – RISK FACTORS” in our 2021 Form 10-K for a discussion of certain risks associated with the licensing, construction, financing and operation of nuclear generating units.

(N)Measurement of Credit Losses on Financial Instruments. The financial assets we hold that are subject to credit losses (Topic 326) are predominately accounts receivable and certain cash equivalents classified as held-to-maturity debt (e.g. commercial paper). Our receivables are generally due within thirty days or less with a significant portion related to billings to our members. See Note F for information regarding our member receivables. Commercial paper issuances we invest in are rated as investment grade and backed by a credit facility. Given our historical experience, the short duration lifetime of these financial assets and the short time horizon over which to consider expectations of future economic conditions, we have assessed that non-collection of the cost basis of these financial assets is remote and we have not recognized an allowance for credit losses.

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

General

We are a Georgia electric membership corporation (an EMC) incorporated in 1974 and headquartered in metropolitan Atlanta. We are owned by our 38 retail electric distribution cooperative members. Our members are consumer-owned distribution cooperatives providing retail electric service in Georgia on a not-for-profit basis. Our principal business is providing wholesale electric power to our members, which we provide primarily from our generation assets and, to a lesser extent, from power purchased from other suppliers. As with cooperatives generally, we operate on a not-for-profit basis.

Results of Operations

For the Three Months Ended March 31, 2022 and 2021

Net Margin

Our net margin for the three-month period ended March 31, 2022 was $22.0 million compared to $26.0 million for the same period of 2021. Through March 31, 2022, we collected approximately 36% of our targeted net margin of $61.5 million for the year ending December 31, 2022. These collections are typical as our capacity revenues are generally recorded evenly throughout the year. We anticipate our board of directors will approve a budget adjustment by year end so that margins will achieve, but not exceed, the 2022 targeted margins for interest ratio of 1.14. As a result, we assessed our projected margin and annual revenue requirement to meet the targeted margins for interest ratio to determine if a refund liability should be recognized. As a result of this assessment, we did not recognize a refund liability as of March 31, 2022 or March 31, 2021. For additional information regarding our net margin requirements and policy, see "Item 7—MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS—Summary of Cooperative Operations—Margins" in our 2021 Form 10-K.

Operating Revenues

Our operating revenues fluctuate from period to period based on several factors, including fuel costs, weather and other seasonal factors, load requirements in our members' service territories, operating costs, availability of electric generation resources, our decisions of whether to dispatch our owned, purchased or member-owned resources over which we have dispatch rights, and our members' decisions of whether to purchase a portion of their hourly energy requirements from our resources or from other suppliers.

Sales to Members.    We generate revenues principally from the sale of electric capacity and energy to our members. Capacity revenues are the revenues we receive for electric service whether or not our generation and purchased power resources are dispatched to produce electricity. These revenues are designed to recover the fixed costs associated with our business, including fixed production expenses, depreciation and amortization expenses and interest charges, plus a targeted margin. Energy revenues are the sales of electricity generated or purchased for our members. Energy revenues recover the variable costs of our business, including fuel, purchased energy and variable operation and maintenance expense.

The components of member revenues for the three-month periods ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022			2021			% Change
Capacity revenues	$	243,291		$	255,824		(4.9)	%
Energy revenues	174,158			120,448			44.6	%
Total	$	417,449		$	376,272		10.9	%
MWh Sales to members	5,573,760			5,245,183			6.3	%
Cents/kWh	7.49			7.17			4.5	%
Member energy requirements supplied	57		%	55		%	3.6	%

Energy revenues from members increased for the three-month period ended March 31, 2022 compared to the same period in 2021 primarily due to the recovery of fuel costs. For a discussion of fuel costs, which are the primary costs recovered by energy revenues, see "—Operating Expenses."

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Sales to non-members.    Energy revenues to non-members were primarily from the sale of a portion of the energy output at Effingham, which we acquired in July 2021, into the wholesale market. For additional information regarding the Effingham acquisition, see Note 13 in our 2021 Form 10-K. There were no capacity revenues to non-members for the three months ended March 31, 2022 and 2021.

Sales to non-members during the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022		2021		% Change
Energy revenues	$	2,993	$	59	4,972.9	%

Operating Expenses

The following table summarizes our fuel costs and megawatt-hour generation by generating source.

	Cost					Generation			Cents per kWh
	(dollars in thousands)					(MWh)
	Three Months Ended March 31,					Three Months Ended March 31,			Three Months Ended March 31,
Fuel Source	2022		2021		% Change	2022	2021	% Change	2022	2021	% Change
Coal	$	32,287	$	15,129	113.4%	976,322	497,238	96.3%	3.31	3.04	8.9%
Nuclear	16,611		18,869		(12.0)%	2,249,064	2,466,130	(8.8)%	0.74	0.77	(3.9)%
Gas:
Combined Cycle	115,057		71,468		61.0%	2,549,581	2,381,859	7.0%	4.51	3.00	50.3%
Combustion Turbine	1,529		2,599		(41.2)%	23,322	56,866	(59.0)%	6.56	4.57	43.5%
	$	165,484	$	108,065	53.1%	5,798,289	5,402,093	7.3%	2.85	2.00	42.5%

Total fuel costs increased for the three-month period ended March 31, 2022 compared to the same period in 2021 as a result of a 42.5% increase in the average cost of fuel as well as a 7.3% increase in generation. The increase in average fuel cost was primarily due to higher average natural gas prices during the first quarter of 2022 as prices have increased due to supply and demand pressures. Coal-fired generation increased primarily as a result of the higher average natural gas prices, which caused generation from the coal-fired units to be relatively more economical. The overall increase in generation for the three-month period ended March 31, 2022 compared to the same period in 2021 was largely due to our members obtaining more of their energy requirements from us rather than their third party suppliers due to relative energy prices.

Production

Production costs can vary due to the number and extent of maintenance outages in a given year. Production costs decreased for the three-month period ended March 31, 2022 as compared to the same period of 2021 primarily as a result of lower fixed major maintenance outage costs associated with our combustion turbine plants. Largely offsetting this decrease were higher fixed major maintenance outage costs at our combined cycle plants.

Interest Charges

Net interest charges decreased slightly as a result of the capitalization of interest expense associated with construction expenditures for Vogtle Units No. 3 and No. 4.

Financial Condition

Balance Sheet Analysis as of March 31, 2022

Assets

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Cash used for property additions for the three-month period ended March 31, 2022 totaled $280.4 million. Of this amount, $182.6 million was associated with construction expenditures for Vogtle Units No. 3 and No. 4 and $27.4 million was for nuclear fuel purchases. The remainder was for expenditures related to normal additions and replacements to our existing generation facilities.

The $44.7 million decrease in nuclear decommissioning trust fund was primarily due to the decrease in unrealized investment gains due to the downturn in the stock market during the first quarter of 2022.

Restricted cash and investments consist of collateral posted by our counterparties under our natural gas swap agreements and funds on deposit with the Rural Utilities Service in the Cushion of Credit Account. We can only utilize these restricted investments for future Rural Utilities Service-guaranteed Federal Financing Bank debt service payments. The program no longer allows additional funds to be deposited into the account. During the first quarter of 2022, restricted cash and investments decreased $85.8 million as we utilized $123.2 million for debt service payments and expect to utilize the remainder of the balance through 2023. The decrease in restricted investments was offset by a $37.4 million increase in restricted cash posted by counterparties under our natural gas swap agreements. For additional information regarding restricted cash and investments, see Note I of Notes to Unaudited Consolidated Financial Statements.

Prepayments and other current assets increased $44.7 million during the three-month period ended March 31, 2022 primarily due to a $50.7 million increase in fair value at March 31, 2022 of our natural gas hedges that will settle within the next twelve months.

Regulatory assets increased $79.3 million largely as a result of a $55.6 million increase in the deferral of accelerated depreciation associated with the early retirement of Plant Wansley, which is expected in August 2022. The increase in our regulatory assets was also attributable to the $13.9 million increase in the deferral associated with nuclear refueling outages.

Other deferred charges increased $59.3 million during the three-month period ended March 31, 2022 primarily due to a $59.2 million increase in fair value at March 31, 2022 of our natural gas hedges that will settle after the next twelve months.

Equity and Liabilities

Long-term debt and long-term debt and finance leases due within one year increased $481.6 million primarily as a result of reclassifying $493.4 million of commercial paper to long-term debt that was refinanced through the issuance of the Series 2022A first mortgage bonds in April 2022, $72.0 million loan advance under one of our lines of credit and $30.2 million advanced under the Rural Utilities Service-guaranteed Federal Financing Bank loan. Offsetting this increase was $115.2 million in debt service payments. See Note L of Notes to Unaudited Consolidated Financial Statements for additional information regarding long-term debt.

Short-term borrowings, which primarily provide interim financing for Vogtle Units No. 3 and No. 4 construction costs, decreased $432.9 million during the three-month period ended March 31, 2022 primarily as a result of reclassification of $493.4 million of commercial paper to long-term debt due to the 2022A first mortgage bonds issuance noted above. During this period, total short-term borrowings were $264.8 million and repayments during the period totaled $204.3 million.

Accounts payable decreased $118.7 million during the three-month period ended March 31, 2022. The decrease was primarily due to a $51.3 million reduction in payables due to Georgia Power, a decrease of $34.6 million in trade accounts payable, primarily for property taxes, and the application of $30.0 million in credits to our members' bills in the first quarter of 2022 for a board-approved reduction in 2021 revenue in excess of the requirement to meet the 2021 targeted net margin.

Other current liabilities increased $44.1 million for the three-month period ended March 31, 2022 primarily as a result of a $37.4 million increase in restricted cash posted by and due to counterparties under our natural gas swap agreements and a $16.2 million increase in accrued property taxes.

Regulatory liabilities increased $48.6 million for the three-month period ended March 31, 2022 primarily due to a $110.0 million increase in the liability associated with unrealized gains on our natural gas hedges. Partially offsetting this increase was a $66.5 million decrease in the liability associated with deferred nuclear asset retirement obligations that was primarily driven by a decrease in unrealized gains associated with our nuclear decommissioning investments.

Capital Requirements and Liquidity and Sources of Capital

Vogtle Units No. 3 and No. 4

We, Georgia Power, the Municipal Electric Authority of Georgia, and the City of Dalton, Georgia, acting by and through its Board of Water, Light and Sinking Fund Commissioners, doing business as Dalton Utilities (collectively, the Co-owners) are parties to an Ownership Participation Agreement that, along with other agreements, governs our participation in two additional nuclear units under construction at Plant Vogtle, Units No. 3 and No. 4. The Co-owners appointed Georgia Power to act as

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agent under this agreement. Our ownership interest and proportionate share of the cost to construct these units is currently 30%, representing approximately 660 megawatts. Pursuant to this agreement, Georgia Power has designated Southern Nuclear Operating Company, Inc. as its agent for licensing, engineering, procurement, contract management, construction and pre-operation services.

In 2008, Georgia Power, acting for itself and as agent for the Co-owners, entered into an Engineering, Procurement and Construction Agreement (the EPC Agreement) with Westinghouse Electric Company LLC and Stone & Webster, Inc., which was subsequently acquired by Westinghouse and changed its name to WECTEC Global Project Services Inc. (collectively, Westinghouse). Pursuant to the EPC Agreement, Westinghouse agreed to design, engineer, procure, construct and test two 1,100 megawatt nuclear units using the Westinghouse AP1000 technology and related facilities at Plant Vogtle.

Until March 2017, construction on Units No. 3 and No. 4 continued under the substantially fixed price EPC Agreement. In March 2017, Westinghouse filed for bankruptcy protection under Chapter 11 of the United States Bankruptcy Code. Effective in July 2017, Georgia Power, acting for itself and as agent for the other Co-owners, and Westinghouse entered into a services agreement (the Services Agreement), pursuant to which Westinghouse is providing facility design and engineering services, procurement and technical support and staff augmentation on a time and materials cost basis. The Services Agreement provides that it will continue until the start-up and testing of Vogtle Units No. 3 and No. 4 is complete and electricity is generated and sold from both units. The Services Agreement is terminable by the Co-owners upon 30 days' written notice.

In October 2017, Georgia Power, acting for itself and as agent for the other Co-owners, entered into a construction completion agreement with Bechtel Power Corporation, pursuant to which Bechtel serves as the primary contractor for the remaining construction activities for Vogtle Units No. 3 and No. 4 (the Bechtel Agreement). The Bechtel Agreement is a cost reimbursable plus fee arrangement, whereby Bechtel is reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Co-owner is severally, and not jointly, liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Co-owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Co-owners will be required to pay amounts related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Co-owner suspensions of work, certain breaches of the Bechtel Agreement by the Co-owners, Co-owner insolvency and certain other events.

Cost and Schedule

Our current budget for our 30% ownership interest in Vogtle Units No. 3 and No. 4, which includes capital costs, allowance for funds used during construction, our allocation of the project-level contingency and a separate Oglethorpe-level contingency is $8.5 billion and is based on commercial operation dates of March 2023 and December 2023 for Units No. 3 and No. 4, respectively. At March 31, 2022, our total investment for our 30% interest in the additional Vogtle units was approximately $7.2 billion. We and some of our members have implemented various rate management programs to lessen the impact on rates when Vogtle Units No. 3 and No. 4 reach commercial operation.

We and our members are currently evaluating exercising the tender option discussed below which would cap our capital costs described above in exchange for a proportionate reduction of our 30% interest in the two new units. Based on the current project budget and schedule and our interpretation of the Global Amendments (described below), if we decide to exercise the tender option, our budget would be $8.1 billion and we would transfer and release from the lien of the first mortgage indenture approximately 42 megawatts, out of 660 megawatts, to Georgia Power. Our resulting ownership share would decline from 30% to approximately 28%. However, if the total project budget exceeds the current budget, our ownership share and megawatts could be further reduced. In addition to requiring approval by our board, any decision regarding the tender option will require certain member approvals.

We have a budget contingency for our interest that is separate and in addition to the project-level contingency. The Oglethorpe-level contingency, which we have carried at various levels since the beginning of the project, provides additional margin to cover potential cost, schedule, and financing risks associated with our share of the project which may not be covered by project-level contingencies. As construction progresses, the Oglethorpe-level contingency may continue to fluctuate as it represents the difference between known project-level costs and contingencies and our total budget. At the end of the project, if there is remaining Oglethorpe-level contingency, we will adjust our project budget to remove this contingency and bill our members based on the actual project costs. The table below shows our project budgets and actual costs through March 31, 2022 for our

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share of the project.

	(in millions)
	Project Budget - No Tender		Project Budget - Tender		Actual Costs at March 31, 2022
Construction Costs (1)	$	6,487	$	6,096	$	5,621
Financing Costs	1,922		1,914		1,561
Total Costs	$	8,409	$	8,010	$	7,182
Project-Level Contingency	$	70	$	70	$	—
Oglethorpe-Level Contingency	21		20		—
Total Contingency	$	91	$	90	$	—
Totals	$	8,500	$	8,100	$	7,182
(1) Construction costs are net of $1.1 billion we received from Toshiba Corporation under a Guarantee Settlement Agreement.

If we do not exercise the tender option, any schedule extension beyond March 2023 and December 2023 for Units No. 3 and No. 4, respectively, is expected to impact our cost by approximately $75 million per month for both units and approximately $30 million per month for Unit No. 4 only, including financing costs. If we exercise the tender option, we expect each additional month of delay to increase our financing costs by approximately $30 million per month for both units and approximately $12 million per month for Unit No. 4.

As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts on a regular basis to incorporate current information available, particularly in the areas of engineering support, commodity installation, system turnovers and related test results and workforce statistics.

Since March 2020, the number of active cases of COVID-19 at the site has fluctuated consistent with the surrounding area and impacted productivity levels and pace of activity completion. COVID-19 has exacerbated the challenges facing the project, including, but not limited to, higher than expected absenteeism; overall construction and subcontractor labor productivity; system turnover and testing activities; and electrical equipment and commodity installation. As of March 31, 2022, the incremental cost associated with COVID-19 mitigation actions and impacts on construction productivity is estimated by Georgia Power to be between $350 million and $438 million (of which our 30% interest is $105 million to $131 million) and is included in the project budget. The continuing effects of the COVID-19 pandemic could further disrupt or delay construction, testing, supervisory, and support activities at Vogtle Units No. 3 and No. 4.

The Unit No. 3 projected schedule primarily depends on construction productivity and production levels, the volume and completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining inspection, tests, analyses and acceptance criteria and begin fuel load, the pace of system and area turnovers, and the progression of startup and other testing. Georgia Power has disclosed that it projects an in-service date for Unit No. 3 by the end of the first quarter of 2023. Our current budgets reflect our expectation of an in-service date for Unit No. 3 in March 2023.

Georgia Power has disclosed that it projects an in-service date for Unit No. 4 by the end of the fourth quarter 2023. Our current budgets anticipate an in-service date for Unit No. 4 in December 2023. Meeting the projected in-service date for Unit No. 4 primarily depends on overall construction productivity and production levels significantly improving as well as appropriate levels of craft laborers, particularly electricians and pipefitters, being added and maintained.

During the first quarter of 2022, Georgia Power assigned $95 million of established construction contingency and additional costs (of which our 30% share was $29 million) to the base capital costs forecast primarily associated with construction productivity, the pace of system turnovers, and support resources for Units No. 3 and No. 4. Georgia Power has stated its expectation to allocate the remainder of the project-level contingency by completion of the project.

As Unit No. 3 completes system turnover from construction and moves to testing and transition to operations, ongoing and potential future challenges include construction productivity, completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining inspections, tests, analyses, and acceptance criteria and begin fuel load, and final component and pre-operational tests. As Unit No. 4 progresses through construction and transitions into testing, ongoing and potential future challenges include the pace and quality of electrical installation; availability of craft and supervisory resources, including the temporary diversion of such resources to support Unit No. 3 construction efforts; and the pace of work package closures and system turnovers; and the timeframe and duration of hot functional and other testing. As construction, including subcontract work, continues on both Units No. 3 and No. 4, ongoing or

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future challenges include management of contractors and vendors; subcontractor performance; supervision of craft labor and related productivity, particularly in the installation of electrical, mechanical, and instrumentation and controls commodities, ability to attract and retain craft labor, and/or related cost escalation; and procurement and related installation. New challenges may arise, particularly as Units No. 3 and No. 4 move into initial testing and start-up, which may result in required engineering changes or remediation related to plant systems, structures or components (some of which are based on new technology that only within the last few years began initial operation in the global nuclear industry at this scale). The ongoing and potential future challenges described above may further impact the projected schedule and estimated cost.

There have been technical and procedural challenges to the construction and licensing of Vogtle Units No. 3 and No. 4 at the federal and state level and additional challenges may arise. In addition, certain license amendment requests have been filed and approved or are pending before the Nuclear Regulatory Commission. Processes are in place that are designed to ensure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the Nuclear Regulatory Commission that occur throughout construction. In connection with the additional construction remediation work described above, Southern Nuclear reviewed the project’s construction quality programs and, where needed, is implementing improvement plans consistent with these processes. On March 25, 2022, the Nuclear Regulatory Commission completed its follow up inspection related to the November 2021 final significance report on its special inspection to review the root cause of this additional construction remediation work and the corresponding corrective action plans. The Nuclear Regulatory Commission closed the findings identified in November 2021 and returned Unit No. 3 to the Nuclear Regulatory Commission’s baseline inspection program.

Various design and other licensing-based compliance matters, including the timely submittal by Southern Nuclear of the inspections, tests, analyses, and acceptance criteria documentation for each unit and the related reviews and approvals by the Nuclear Regulatory Commission necessary to support authorization to load fuel, have arisen and may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues, including inspections, tests, analyses, and acceptance criteria, are not resolved in a timely manner, there may be further delays in the project schedule that could result in increased costs to the Co-owners.

The ultimate outcome of these matters cannot be determined at this time.

Co-Owner Contracts and Other Information

In November 2017, the Co-owners entered into an amendment to their joint ownership agreements for Vogtle Units No. 3 and No. 4 to provide for, among other conditions, additional Co-owner approval requirements. These joint ownership agreements, including the Co-owner approval requirements, were subsequently amended, effective August 31, 2018. As described below, certain provisions of the Joint Ownership Agreements were modified further on September 26, 2018 by the Term Sheet that was memorialized on February 18, 2019 when the Co-owners entered into certain amendments (the Global Amendments) to the Joint Ownership Agreements (as amended, the Joint Ownership Agreements).

As a result of an increase in the total project capital cost forecast and Georgia Power’s decision not to seek recovery of its allocation of the increase in the base capital costs and the increased construction budget in connection with Georgia Power’s nineteenth Vogtle construction monitoring (VCM) report in 2018, the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 were required to vote to continue construction. In September 2018, the Co-owners unanimously voted to continue construction of Vogtle Units No. 3 and No. 4.

In connection with the September 2018 vote to continue construction, Georgia Power entered into a binding term sheet with the other Co-owners and MEAG’s wholly-owned subsidiaries MEAG Power SPVJ, LLC, MEAG Power SPVM, LLC, and MEAG Power SPVP, LLC to mitigate certain financial exposure for the other Co-owners and offered to purchase production tax credits from each of the other Co-Owners, at that Co-owner’s option (the Term Sheet). On February 18, 2019, the Co-owners entered into the Global Amendments to memorialize the provisions of the Term Sheet. Pursuant to the Global Amendments and consistent with the Term Sheet, the Joint Ownership Agreements provide that:

•each Co-owner is obligated to pay its proportionate share of construction costs for Vogtle Units No. 3 and No. 4 based on its ownership interest up to (i) the estimated cost at completion ("EAC") for Vogtle Units No. 3 and No. 4 which formed the basis of Georgia Power's forecast of $8.4 billion in Georgia Power's nineteenth VCM report filed with the Georgia Public Service Commission plus (ii) $800 million of additional construction costs.

•Georgia Power will be responsible for 55.7% of construction costs, subject to exceptions such as costs that are a result of a force majeure event, that exceed the EAC in the nineteenth VCM report by $800 million to $1.6 billion (resulting in up to $80 million of potential additional costs to Georgia Power which would save Oglethorpe up to $44 million), with the remaining Co-owners responsible for 44.3% of such costs pro rata in accordance with their respective ownership interests (equal to 24.5% for our 30% ownership interest); and

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•Georgia Power will be responsible for 65.7% of construction costs, subject to exceptions such as costs that are a result of a force majeure event, that exceed the EAC in the nineteenth VCM report by $1.6 billion to $2.1 billion (resulting in up to a further $100 million of potential additional costs to Georgia Power which would save Oglethorpe up to an additional $55 million), with the remaining Co-owners responsible for 34.3% of such costs pro rata in accordance with their respective ownership interests (equal to 19.0% for our 30% ownership interest).

If the EAC is revised and exceeds the EAC in the nineteenth VCM report by more than $2.1 billion, each of the Co-owners, other than Georgia Power, will have a one-time option to tender a portion of its ownership interest to Georgia Power in exchange for Georgia Power’s agreement to pay 100% of such Co-owner’s share of construction costs actually incurred in excess of the EAC in the nineteenth VCM report plus $2.1 billion. If any Co-owner elects to exercise this tender option, Georgia Power would have the option to cancel the project in lieu of accepting the offer to purchase a portion of the Co-owner’s ownership interest. If Georgia Power does not elect to cancel the project, then Georgia Power must accept the offer, and the ownership interest to be conveyed from the tendering Co-owner to Georgia Power will be calculated based on the percentage of the cumulative amount of construction costs paid by such tendering Co-owner as of the commercial operation date of Vogtle Unit No. 4. For purposes of this calculation, payments made by Georgia Power on behalf of the tendering Co-owner in accordance with the second and third bullets above will be treated as payments made by that Co-owner. This option to tender a portion of our interest to Georgia Power upon such a budget increase would allow us to freeze our construction budget associated with the Vogtle project in exchange for a proportionate reduction of our 30% ownership interest. In November 2021, Georgia Power and the other Co-owners clarified the process to exercise the tender option to require that a Co-owner desiring to exercise the tender option must do so between 120 and 180 days after the tender option is triggered.

The nineteenth VCM report total project cost is $17.1 billion (which excludes non-shareable costs) as reflected in numerous Georgia Public Service Commission filings. As of December 31, 2021, budget increases since the nineteenth VCM have reached $3.4 billion for all Co-owners. As a result of these increases, we believe that the tender option was triggered at the Co-owner construction budget vote on February 14, 2022 and that Georgia Power’s increased responsibility for certain construction costs as described above commenced in March 2022. Georgia Power and the other Co-owners do not agree on the dollar amount that triggers each Co-owner’s option to tender a portion of its ownership interest to Georgia Power under the tender option or the extent to which costs that are the result of a force majeure event (such as COVID-19) impact the point at which the tender option is triggered. For purposes of determining when the Co-owners’ option to tender has been triggered, the Global Amendments do not exclude costs resulting from force majeure events (such as COVID-19) from the calculation of when the EAC in the nineteenth VCM report plus $2.1 billion has been reached. Georgia Power and the other Co-owners also do not agree on the dollar amount that triggers Georgia Power’s increased responsibility for certain construction costs as described above, and the extent to costs that are the result of a force majeure event (such as COVID-19), impact the calculation of the point at which Georgia Power’s increased responsibility for certain construction costs as described above is triggered. The exclusion of costs resulting from a force majeure event (such as COVID-19) in the Global Amendments only applies to Georgia Power’s increased cost responsibility during the time period when construction costs exceed the EAC in the nineteenth VCM report by $800 million to $2.1 billion. Accordingly, in March 2022, we notified Georgia Power of a billing dispute with regards to both the starting dollar amount and the application of costs resulting from a force majeure event and how such amounts impact the thresholds and timing of the cost-sharing and tender option provisions. This notice commenced the dispute resolution procedures set forth in the Ownership Participation Agreement for the additional Vogtle units.

Our ownership interest in Vogtle Units No. 3 and No. 4 continues to be 30%; however, this could decrease if we exercise our option to tender a portion of our ownership interest and require Georgia Power to pay 100% of the remaining share of the costs necessary to complete the units. Our decremental ownership interest would be calculated and conveyed to Georgia Power after both Vogtle units are placed in service. Based on the current project budget and on our interpretation of the Global Amendments, if we decide to exercise the tender option, we would transfer approximately 42 megawatts, out of 660 megawatts, to Georgia Power. Our resulting ownership share would decline from 30% to approximately 28%.

Pursuant to the Joint Ownership Agreements, as amended by the Global Amendments, the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 must vote to continue construction, or can vote to suspend construction, if certain adverse events occur, including: (i) the bankruptcy of Toshiba Corporation; (ii) termination or rejection in bankruptcy of certain agreements, including the Services Agreement, the Bechtel Agreement or the agency agreement with Southern Nuclear; (iii) Georgia Power publicly announces its intention not to submit for rate recovery any portion of its investment in Vogtle Units No. 3 and No. 4 (or associated financing costs) or the Georgia Public Service Commission determines that any of Georgia Power's costs relating to the construction of Vogtle Units No. 3 and No. 4 will not be recovered in retail rates, excluding any additional amounts paid by Georgia Power on behalf of the other Co-owners pursuant to the Global Amendment provisions described above and the first 6% of costs during any six-month VCM reporting period that are disallowed by the Georgia Public Service Commission for recovery, or for which Georgia Power elects not to seek cost recovery, through retail rates or (iv) an incremental extension of one year or more from the seventeenth VCM report estimated in-service dates of November 2021 and November 2022 for Units No. 3 and No. 4, respectively. The schedule extensions announced in February 2022, which reflected a cumulative delay of over a year for each unit from the schedules approved in the seventeenth VCM report, triggered the requirement for the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 to vote to continue construction, and the Co-owners unanimously voted to continue construction.

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The Global Amendments provide that Georgia Power may cancel the project at any time at its sole discretion. In the event that Georgia Power determines to cancel the project or fewer than 90% of the Co-owners vote to continue construction upon the occurrence of a subsequent project adverse event, we and the other Co-owners would assess our options for the Vogtle project. If the investment were to be written off, we would seek regulatory accounting treatment to amortize the investment over a long-term period, which requires the approval of our board of directors, and we would submit the regulatory accounting treatment details to the Rural Utilities Service for its approval. Further, if Georgia Power or the Co-owners decided to cancel the project, the Department of Energy would have the discretion to require that we repay all amounts outstanding under our loan guarantee agreement with the Department of Energy over a five-year period as discussed in Note L of Notes to Unaudited Consolidated Financial Statements.

The ultimate outcome of these matters cannot be determined at this time.

See “Item 1A – RISK FACTORS” in our 2021 Form 10-K for a discussion of certain risks associated with the licensing, construction, financing and operation of nuclear generating units.

Environmental Regulations

Federal and state laws and regulations regarding environmental matters affect operations at our facilities. For a discussion regarding potential effects on our business from environmental regulations, including potential capital requirements, see "Item 1—BUSINESS—REGULATION—Environmental," "Item 1A—RISK FACTORS" and "Item 7—MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS—Financial Condition—Capital Requirements—Capital Expenditures" in our 2021 Form 10-K.

Liquidity

At March 31, 2022, we had $1.0 billion of unrestricted available liquidity to meet our short-term cash needs and liquidity requirements. This amount included $467 million in cash and cash equivalents and $579 million available under our $1.8 billion of committed credit arrangements, the details of which are reflected in the table below:

Committed Credit Facilities
	Authorized Amount		Available March 31, 2022			Expiration Date
	(dollars in millions)
Unsecured Facilities:
Syndicated Line of Credit led by CFC	$	1,210	$	54	'(1)	December 2024
CFC Line of Credit(2)	110		110			December 2023
JPMorgan Chase Line of Credit	350		275		'(3)	October 2024
Secured Facilities:
CFC Term Loan(2)	250		140			December 2023

(1)This facility is dedicated to support outstanding commercial paper and the portion of this facility that was unavailable represents outstanding commercial paper at March 31, 2022.

(2)Any amounts drawn under the $110 million unsecured line of credit with CFC will reduce the amount that can be drawn under the $250 million secured term loan. Therefore, we reflect $140 million as the amount available under the term loan even though there are no amounts outstanding under that facility. Any amounts borrowed under the $250 million term loan would be secured under our first mortgage indenture, with a maturity no later than December 31, 2043.

(3)At March 31, 2022, $72 million in loans were outstanding under this facility and $2.7 million of this facility was used for letters of credit issued to provide performance assurance to third parties.

We have the flexibility to use the $1.2 billion syndicated line of credit for several purposes, including borrowing for general corporate purposes, issuing letters of credit and backing up commercial paper.

Under our commercial paper program, we are authorized to issue commercial paper in amounts that do not exceed the amount of our committed backup lines of credit, thereby providing 100% dedicated support for any commercial paper outstanding. Due to this requirement, any commercial paper we issue will reduce the availability under the $1.2 billion syndicated line of credit. Currently, we are issuing commercial paper primarily to provide interim funding for:

•payments related to the construction of Vogtle Units No. 3 and No. 4,

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•principal payments due under our Department of Energy-guaranteed loans, which began in February 2020 and which we intend to continue funding with commercial paper until Vogtle Unit No. 4 is placed in service, and

•costs related to the Effingham plant acquisition.

We plan to refinance our commercial paper with long-term debt, either through the issuance of first mortgage bonds, through our loan guaranteed by the Department of Energy, or through financing by the Rural Utilities Service.

Our loan guaranteed by the Department of Energy is our preferred source of long-term financing of eligible costs for Vogtle Units No. 3 and No. 4. See Note L of Notes to Unaudited Consolidated Financial Statements and “—Financing Activities—Department of Energy-Guaranteed Loans” for additional information regarding the Department of Energy-guaranteed loans.

Rural Utilities Service financing is our preferred source of long-term financing for the Effingham acquisition and we have received a conditional loan commitment from the Rural Utilities Service for this financing. See Note 13 of our 2021 Form 10-K for additional information regarding the Effingham acquisition.

We intend to issue first mortgage bonds to provide long-term refinancing of all costs not financed through the Department of Energy or the Rural Utilities Service, including refinancing of the principal payments we are currently paying under our Department of Energy-guaranteed loans.

On April 12, 2022, we issued $500 million of Series 2022A First Mortgage Bonds and used the $493.4 million of net proceeds to refinance a portion of our outstanding commercial paper issued to pay for the construction of Vogtle Units No. 3 and No. 4. See "—Financing Activities—Bond Financings” for additional information regarding our first mortgage bonds.

At March 31, 2022, under our unsecured committed lines of credit we had the ability to issue letters of credit totaling $960 million in the aggregate and $438.9 million remained available for the issuance of letters of credit.

Between projected cash on hand and the credit arrangements currently in place, we believe we have sufficient liquidity to cover normal operations and our interim financing needs, including interim financing for the new Vogtle units, Department of Energy principal payments, and Effingham acquisition, until long-term financing is obtained.

Three of our credit facilities contain a financial covenant that requires us to maintain minimum levels of patronage capital. At March 31, 2022, the required minimum level was $750 million and our actual patronage capital was $1.2 billion. These agreements contain an additional covenant that limits our secured indebtedness and unsecured indebtedness, both as defined in the credit agreements, to $14 billion and $4 billion, respectively. At March 31, 2022, we had $10.8 billion of secured indebtedness and $1.2 billion of unsecured indebtedness outstanding.

Under our power bill prepayment program, members can prepay their power bills from us at a discount for an agreed number of months in advance, after which point the funds are credited against the participating members' monthly power bills. At March 31, 2022, we had seven members participating in the program and a balance of $98.1 million remaining to be applied against future power bills.

At March 31, 2022, we had $197.0 million on deposit in the Rural Utilities Service Cushion of Credit Account, and $39.2 million of cash collateral posted by counterparties to our natural gas hedge program, all of which is classified as a restricted investment and restricted cash, respectively.

Financing Activities

First Mortgage Indenture.    At March 31, 2022, we had $10.8 billion of long-term debt outstanding under our first mortgage indenture secured equally and ratably by a lien on substantially all of our owned tangible and certain of our intangible property, including property we acquire in the future. See "Item 1—BUSINESS—OGLETHORPE POWER CORPORATION—First Mortgage Indenture" in our 2021 Form 10-K for further discussion of our first mortgage indenture.

Bond Financings. In April 2022, we issued $500 million of taxable first mortgage bonds due in 2047 to repay $493.4 million of commercial paper issued to fund a portion of the cost of constructing Vogtle Units No. 3 and No. 4. The first mortgage bonds are secured under our first mortgage indenture.

Rural Utilities Service-Guaranteed Loans.    At March 31, 2022, we had one approved Rural Utilities Service-guaranteed loan totaling $630.3 million to fund general and environmental improvements that had $317.1 million remaining to be advanced.

35

When advanced, the debt will be secured under our first mortgage indenture. As of March 31, 2022, we had $2.6 billion of debt outstanding under various Rural Utilities Service-guaranteed loans. We also have a conditional commitment for a $234.7 million loan to fund a portion of our cost to acquire Effingham.

Department of Energy-Guaranteed Loans.   We have loans from the Federal Financing Bank guaranteed by the Department of Energy to provide funding for over $4.6 billion of the cost to construct our interest in Vogtle Units No. 3 and No. 4.

At March 31, 2022, aggregate Department of Energy-guaranteed borrowings totaled $4.1 billion, including capitalized interest. All of the debt advanced under the loan guarantee agreement is secured ratably with all other debt under our first mortgage indenture.

In accordance with the promissory notes, we began principal repayments of our Department of Energy-guaranteed loans in February 2020. As of March 31, 2022, we had repaid $217.7 million under these loans. If we fully advance these loans, we expect to repay a total of approximately $455 million in principal on these loans by December 2023. We plan to issue first mortgage bonds to refinance the principal repaid after the in-service date of Vogtle Unit No. 4.

For more information regarding the loan guarantee agreement, see Note L of Notes to Unaudited Consolidated Financial Statements. For more detailed information regarding our financing plans, see "Item 7—MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS—Financial Condition—Financing Activities" in our 2021 Form 10-K.

Newly Adopted or Issued Accounting Standards

For a discussion of recently issued or adopted accounting pronouncements, see Note E of Notes to Unaudited Consolidated Financial Statements.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk

There have been no material changes to the market risks disclosed in "Item 7A—QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK" in our 2021 Form 10-K.

Item 4.    Controls and Procedures

As of March 31, 2022, under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended. Based on this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures are effective.

There have been no changes in internal control over financial reporting or other factors that occurred during the quarter ended March 31, 2022 that have materially affected, or are reasonably likely to affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

Item 1.    Legal Proceedings

There have been no material changes to the legal proceedings disclosed in "Item 3—LEGAL PROCEEDINGS" in our 2021 Form 10-K.

For information about loss contingencies that could have an effect on us, see Note H to Unaudited Consolidated Financial Statements.

Item 1A.    Risk Factors

There have been no material changes to the risk factors disclosed in "Item 1A—Risk Factors" in our 2021 Form 10-K.

Item 2.    Unregistered Sales of Equity Securities and Use of Proceeds

Not Applicable.

Item 3.    Defaults upon Senior Securities

Not Applicable.

36

Item 4.    Mine Safety Disclosures

Not Applicable.

Item 5.    Other Information

Not Applicable.

37

Item 6.    Exhibits

Number	Description
31.1	Rule 13a-14(a)/15d-14(a) Certification, by Michael L. Smith (Principal Executive Officer).
31.2	Rule 13a-14(a)/15d-14(a) Certification, by Elizabeth B. Higgins (Principal Financial Officer).
32.1	Certification Pursuant to 18 U.S.C. 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Michael L. Smith (Principal Executive Officer).
32.2	Certification Pursuant to 18 U.S.C. 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, by Elizabeth B. Higgins (Principal Financial Officer).
99.1	Member Financial and Statistical Information (for calendar years 2019-2021).
101	XBRL Interactive Data File.
104	Cover Page Interactive Data File – (embedded within the Inline XBRL document).

38

SIGNATURES

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.

			Oglethorpe Power Corporation (An Electric Membership Corporation)
Date:	May 12, 2022	By:	/s/ Michael L. Smith
			Michael L. Smith President and Chief Executive Officer
Date:	May 12, 2022		/s/ Elizabeth B. Higgins
			Elizabeth B. Higgins Executive Vice President and Chief Financial Officer (Principal Financial Officer)

EX-31.1

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EXHIBIT 31.1

Rule 13a-14(a)/15d-14(a) Certification, by Michael L. Smith

(Principal Executive Officer)

I, Michael L. Smith, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Oglethorpe Power Corporation (An Electric Membership 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 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 12, 2022

/s/ MICHAEL L. SMITH

Michael L. Smith

President and Chief Executive Officer

(Principal Executive Officer)

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EX-31.2

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EXHIBIT 31.2

Rule 13a-14(a)/15d-14(a) Certification, by Elizabeth B. Higgins

(Principal Financial Officer)

I, Elizabeth B. Higgins, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Oglethorpe Power Corporation (An Electric Membership 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 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 12, 2022

/s/ ELIZABETH B. HIGGINS

Elizabeth B. Higgins

Executive Vice President and Chief Financial Officer

(Principal Financial Officer)

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EX-32.1

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EXHIBIT 32.1

Certification Pursuant to 18 U.S.C. 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2022 (the "Report") of Oglethorpe Power Corporation (the "Registrant"), as filed with the Securities and Exchange Commission on the date hereof, I, Michael L. Smith, the President and Chief Executive Officer of the Registrant certify, to the best of my knowledge, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ MICHAEL L. SMITH

Michael L. Smith

President and Chief Executive Officer

May 12, 2022
Date

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EX-32.2

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EXHIBIT 32.2

Certification Pursuant to 18 U.S.C. 1350

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2022 (the "Report") of Oglethorpe Power Corporation (the "Registrant"), as filed with the Securities and Exchange Commission on the date hereof, I, Elizabeth B. Higgins, the Executive Vice President and Chief Financial Officer of the Registrant certify, to the best of my knowledge, that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ ELIZABETH B. HIGGINS

Elizabeth B. Higgins Executive Vice President and Chief Financial Officer

May 12, 2022
Date

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EX-99.1

Exhibit 99.1 FINANCIAL AND STATISTICAL INFORMATION FOR 38 MEMBERS OF OGLETHORPE POWER CORPORATION Our members operate their systems on a not-for-profit basis. Accumulated margins derived after payment of operating expenses and provision for depreciation constitute patronage capital of the consumers of our members. Refunds of accumulated patronage capital to the individual consumers may be made from time to time subject to limitations contained in mortgages between our members and the Rural Utilities Service or loan documents with other lenders. The Rural Utilities Service mortgage generally prohibits such distributions unless, after any such distribution, the member’s total equity will equal at least 30% of its total assets, except that distributions may be made of up to 25% of the margins and patronage capital received by the member in the preceding year provided that equity is at least 20%. We are a membership corporation, and our members are not our subsidiaries. Except with respect to the obligations of our members under each member’s wholesale power contract with us and our rights under such contracts to receive payment for power and energy supplied, we have no legal interest in, or obligations in respect of, any of the assets, liabilities, equity, revenues or margins of our members. The following selected information on the individual members is intended to show, in the aggregate, the assets, liabilities, equity, revenues and margins of our members. Member assets, liabilities, equity, revenues and margins should not, however, be attributed to us. In addition, the revenues of our members are not pledged to us, but such revenues are received by the respective members and are the source from which moneys are derived by our members to pay for power and energy received from us. Revenues of our members are, however, pledged under their respective Rural Utilities Service mortgages or loan documents with other lenders. The information contained in these tables was taken from Rural Utilities Service Financial and Statistical Reports (RUS Form 7) or similar reports prepared for other lenders or provided directly by a member. This information has not been independently verified by the Rural Utilities Service, any lender or us. The “Total” columns were not supplied or compiled by the Rural Utilities Service, any lender or our members. The “Total” column in each table is for informational purposes only, inasmuch as each member operates independently and is not responsible for the obligations of other members, except as provided in the wholesale power contracts (see “BUSINESS ― OGLETHORPE POWER CORPORATION ― Wholesale Power Contracts” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021). In addition, the Times Interest Earned, Equity to Assets and Equity to Total Capitalization ratios were calculated by us from information obtained from each member’s RUS Form 7 or other financial information provided to us, but the calculations were not independently verified by our members. No adjustments were made by us in calculating these ratios for items such as debt refinancings that are not reflected separately on the financial information provided to us. For the calendar years 2019, 2020 and 2021, the information on the individual members is presented in the succeeding tables as follows: Table 1 - Selected Statistics, Table 2 - Average Number of Consumers Served, Table 3 - Annual Megawatt-hour Sales by Consumer Class, Table 4 - Annual Revenues by Consumer Class, Table 5 - Summary of Operating Results, and Table 6 - Condensed Balance Sheet Information.

FINANCIAL AND STATISTICAL INFORMATION FOR THE 38 MEMBERS OF OGLETHORPE POWER CORPORATION Table 1 SELECTED STATISTICS OF EACH MEMBER (as of December 31) Central Coweta- Altamaha Amicalola Canoochee Carroll Georgia Coastal Cobb Colquitt Fayette Diverse 2021 Avg. Monthly Residential Rev. ($) 146.47 136.42 140.02 140.96 134.59 168.29 128.58 128.62 137.13 180.61 Avg. Monthly Residential kWh 1,029 1,217 1,138 1,177 1,251 1,223 1,088 1,174 1,208 1,212 Avg. Residential Rev.(cents per kWh) 14.24 11.21 12.30 11.97 10.76 13.76 11.82 10.96 11.35 14.90 Times Interest Earned Ratio (1) 2.93 2.26 2.21 3.58 2.39 3.92 5.32 1.58 3.26 1.16 Equity / Assets (1) 55% 40% 46% 45% 31% 40% 51% 44% 45% 33% Equity / Total Capitalization (1) 61% 52% 56% 51% 39% 45% 60% 53% 58% 38% 2020 Avg. Monthly Residential Rev. ($) 142.11 133.05 142.92 138.15 132.92 171.42 128.96 124.22 134.02 175.42 Avg. Monthly Residential kWh 1,062 1,170 1,155 1,140 1,268 1,252 1,115 1,185 1,204 1,213 Avg. Residential Rev.(cents per kWh) 13.38 11.37 12.38 12.12 10.48 13.69 11.57 10.48 11.13 14.47 Times Interest Earned Ratio (1) 3.38 2.89 2.49 3.71 2.03 3.85 3.55 2.39 3.28 1.30 Equity / Assets (1) 54% 44% 47% 44% 32% 39% 41% 45% 46% 33% Equity / Total Capitalization (1) 60% 59% 59% 51% 38% 44% 52% 53% 56% 38% 2019 Avg. Monthly Residential Rev. ($) 145.62 138.93 145.41 144.06 134.37 171.97 129.66 129.66 142.86 180.84 Avg. Monthly Residential kWh 1,073 1,237 1,174 1,203 1,319 1,235 1,168 1,216 1,271 1,253 Avg. Residential Rev.(cents per kWh) 13.57 11.23 12.38 11.98 10.19 13.92 11.10 10.66 11.24 14.44 Times Interest Earned Ratio (1) 2.93 2.04 2.76 2.77 2.27 2.60 3.44 2.85 3.84 1.33 Equity / Assets (1) 56% 44% 49% 45% 33% 38% 42% 46% 46% 34% Equity / Total Capitalization (1) 62% 60% 57% 53% 39% 43% 51% 53% 53% 39% Little Excelsior Flint Grady GreyStone Habersham Hart Irwin Jackson Jefferson Ocmulgee 2021 Avg. Monthly Residential Rev. ($) 129.06 160.79 150.70 123.24 132.84 142.60 146.91 133.89 136.92 133.56 Avg. Monthly Residential kWh 1,194 1,235 1,092 1,186 1,032 1,133 1,037 1,182 1,099 955 Avg. Residential Rev.(cents per kWh) 10.81 13.02 13.80 10.39 12.87 12.59 14.17 11.33 12.46 13.99 Times Interest Earned Ratio (1) 2.74 2.74 3.44 3.88 2.78 6.44 2.15 3.10 2.03 2.16 Equity / Assets (1) 53% 38% 48% 49% 36% 50% 37% 46% 34% 41% Equity / Total Capitalization (1) 67% 46% 58% 55% 46% 65% 40% 53% 43% 47% 2020 Avg. Monthly Residential Rev. ($) 125.72 158.97 152.40 123.05 134.64 134.78 144.95 137.93 137.23 128.28 Avg. Monthly Residential kWh 1,220 1,265 1,097 1,176 1,041 1,107 1,045 1,206 1,117 962 Avg. Residential Rev.(cents per kWh) 10.31 12.56 13.89 10.46 12.94 12.17 13.86 11.44 12.29 13.34 Times Interest Earned Ratio (1) 2.77 2.32 4.72 2.62 2.36 5.07 1.91 3.14 1.97 2.03 Equity / Assets (1) 54% 39% 46% 47% 38% 47% 35% 46% 33% 40% Equity / Total Capitalization (1) 69% 47% 55% 53% 52% 61% 39% 54% 42% 48% 2019 Avg. Monthly Residential Rev. ($) 129.61 161.97 143.68 124.57 136.32 148.86 150.82 139.40 138.84 135.16 Avg. Monthly Residential kWh 1,237 1,283 1,128 1,235 1,041 1,132 1,071 1,253 1,158 987 Avg. Residential Rev.(cents per kWh) 10.47 12.62 12.74 10.08 13.09 13.15 14.08 11.12 11.99 13.70 Times Interest Earned Ratio (1) 2.66 2.21 2.99 3.42 2.24 3.97 1.65 2.73 2.14 1.71 Equity / Assets (1) 56% 39% 44% 49% 39% 44% 33% 46% 35% 39% Equity / Total Capitalization (1) 68% 48% 52% 55% 50% 57% 37% 54% 43% 47% Footnotes: (1) Times Interest Earned and Equity ratios were calculated from information contained on each Member's RUS Form 7, or similar form provided to another lender, and were not independently verified by each respective Member.

Table 1 (Continued) Middle Slash Georgia Mitchell Ocmulgee Oconee Okefenoke Planters Rayle Satilla Sawnee Pine 2021 Avg. Monthly Residential Rev. ($) 163.64 169.26 124.08 155.63 145.84 157.36 140.49 140.92 138.97 140.20 Avg. Monthly Residential kWh 1,183 1,147 961 1,153 1,164 1,187 1,064 1,195 1,164 1,084 Avg. Residential Rev.(cents per kWh) 13.84 14.75 12.91 13.49 12.53 13.26 13.21 11.79 11.94 12.93 Times Interest Earned Ratio (1) 1.77 2.32 7.05 2.10 2.45 4.16 2.85 2.59 4.03 3.32 Equity / Assets (1) 42% 48% 72% 43% 37% 48% 41% 45% 33% 44% Equity / Total Capitalization (1) 47% 59% 83% 53% 42% 58% 46% 55% 47% 52% 2020 Avg. Monthly Residential Rev. ($) 149.94 165.99 124.51 151.18 149.97 158.18 139.38 132.91 133.50 137.55 Avg. Monthly Residential kWh 1,165 1,152 950 1,151 1,201 1,192 1,066 1,188 1,177 1,079 Avg. Residential Rev.(cents per kWh) 12.88 14.41 13.10 13.14 12.49 13.27 13.08 11.19 11.34 12.75 Times Interest Earned Ratio (1) 2.23 3.30 5.53 1.99 2.16 3.90 2.80 2.26 2.74 4.10 Equity / Assets (1) 43% 48% 68% 42% 37% 48% 39% 48% 32% 48% Equity / Total Capitalization (1) 48% 61% 81% 51% 43% 59% 45% 58% 46% 56% 2019 Avg. Monthly Residential Rev. ($) 155.31 165.85 127.36 155.32 148.87 159.92 141.49 138.78 128.08 139.97 Avg. Monthly Residential kWh 1,221 1,191 1,002 1,200 1,184 1,228 1,102 1,220 1,234 1,115 Avg. Residential Rev.(cents per kWh) 12.72 13.93 12.71 12.95 12.58 13.03 12.84 11.38 10.38 12.55 Times Interest Earned Ratio (1) 2.22 2.17 4.18 1.99 1.61 3.46 2.67 2.69 2.73 3.89 Equity / Assets (1) 42% 46% 64% 41% 36% 48% 38% 48% 34% 46% Equity / Total Capitalization (1) 47% 61% 79% 48% 42% 56% 44% 57% 47% 54% Snapping Southern Three Tri- MEMBER Shoals Rivers Sumter Notch County Upson Walton Washington WTD. AVG. 2021 Avg. Monthly Residential Rev. ($) 135.59 162.03 166.91 125.36 151.74 119.39 145.74 129.41 138.94 Avg. Monthly Residential kWh 1,289 1,216 1,281 891 1,142 1,078 1,219 1,016 1,169 Avg. Residential Rev.(cents per kWh) 10.52 13.3 13.03 14.1 13.28 11.08 11.96 12.74 11.88 Times Interest Earned Ratio (1) 2.19 1.88 2.47 1.74 2.49 6.27 2.83 1.79 3.22 Equity / Assets (1) 33% 36% 48% 50% 33% 68% 42% 49% 43% Equity / Total Capitalization (1) 51% 42% 54% 54% 37% 75% 63% 53% 53% 2020 Avg. Monthly Residential Rev. ($) 125.83 158.42 165.90 123.47 149.50 120.98 144.01 125.29 137.13 Avg. Monthly Residential kWh 1,261 1,231 1,265 890 1,166 1,076 1,234 1,027 1,177 Avg. Residential Rev.(cents per kWh) 9.97 12.9 13.12 13.9 12.83 11.24 11.67 12.20 11.65 Times Interest Earned Ratio (1) 2.09 3.64 2.51 4.15 3.41 5.26 4.48 2.35 2.95 Equity / Assets (1) 33% 42% 48% 49% 36% 68% 36% 52% 42% Equity / Total Capitalization (1) 53% 49% 54% 52% 39% 75% 59% 56% 52% 2019 Avg. Monthly Residential Rev. ($) 134.01 165.22 172.19 126.07 157.38 127.32 147.44 127.09 139.74 Avg. Monthly Residential kWh 1,340 1,309 1,311 936 1,245 1,128 1,288 1,064 1,223 Avg. Residential Rev.(cents per kWh) 10.00 12.62 13.14 13.46 12.64 11.28 11.45 11.95 11.42 Times Interest Earned Ratio (1) 2.22 3.56 2.16 2.63 3.35 4.28 5.00 2.17 2.84 Equity / Assets (1) 36% 41% 49% 38% 34% 67% 37% 53% 42% Equity / Total Capitalization (1) 55% 48% 55% 54% 37% 75% 64% 57% 52% Footnotes: (1) Times Interest Earned and Equity ratios were calculated from information contained on each Member's RUS Form 7, or similar form provided to another lender, and were not independently verified by each respective Member.

FINANCIAL AND STATISTICAL INFORMATION FOR THE 38 MEMBERS OF OGLETHORPE POWER CORPORATION Table 2 AVERAGE NUMBER OF CONSUMERS SERVED BY EACH MEMBER Central Coweta- Altamaha Amicalola Canoochee Carroll Georgia Coastal Cobb Colquitt Fayette Diverse 2021 Residential Service 19,096 46,675 21,956 50,451 55,732 18,634 192,756 63,154 78,622 30,743 Commercial & Industrial 1,897 5,459 390 2,603 5,579 2,826 17,388 3,714 6,452 4,305 Other 262 5 808 385 383 136 5,430 3,237 951 1,032 Total Consumers Served 21,255 52,139 23,154 53,439 61,694 21,596 215,574 70,105 86,025 36,080 2020 Residential Service 18,827 45,653 21,412 49,511 53,933 17,950 190,114 61,923 76,940 30,348 Commercial & Industrial 1,877 5,171 391 2,566 5,318 2,815 17,152 3,650 6,382 4,258 Other 260 5 783 383 363 139 5,420 3,220 892 1,024 Total Consumers Served 20,964 50,829 22,586 52,460 59,614 20,904 212,686 68,793 84,214 35,630 2019 Residential Service 18,705 44,909 20,998 48,821 52,721 17,393 187,233 61,093 75,361 30,111 Commercial & Industrial 1,873 5,074 371 2,555 5,206 2,673 16,969 3,591 6,319 4,210 Other 255 8 765 384 345 141 5,388 3,156 817 994 Total Consumers Served 20,833 49,991 22,134 51,760 58,272 20,207 209,590 67,840 82,497 35,315 Little Excelsior Flint Grady GreyStone Habersham Hart Irwin Jackson Jefferson Ocmulgee 2021 Residential Service 22,172 78,564 18,899 128,478 33,222 28,879 10,789 219,455 33,101 11,095 Commercial & Industrial 1,488 11,154 491 10,699 2,552 8,821 238 18,591 1,860 152 Other 460 1,185 704 1,969 8 11 1,652 5,212 446 461 Total Consumers Served 24,120 90,903 20,094 141,146 35,782 37,711 12,679 243,258 35,407 11,708 2020 Residential Service 21,799 77,451 18,708 125,898 32,749 28,513 10,669 214,537 32,661 10,930 Commercial & Industrial 1,471 10,883 489 10,394 2,530 8,477 233 18,177 1,826 149 Other 441 1,175 701 1,908 8 11 1,630 5,103 439 450 Total Consumers Served 23,711 89,509 19,898 138,200 35,287 37,001 12,532 237,817 34,926 11,529 2019 Residential Service 21,489 76,082 18,681 123,383 32,498 28,344 10,634 210,196 32,277 10,884 Commercial & Industrial 1,440 10,586 492 10,394 2,563 8,308 226 17,902 1,799 147 Other 429 1,134 692 1,813 6 11 1,617 5,003 431 441 Total Consumers Served 23,358 87,802 19,865 135,590 35,067 36,663 12,477 233,101 34,507 11,472

Table 2 (Continued) Middle Slash Georgia Mitchell Ocmulgee Oconee Okefenoke Planters Rayle Satilla Sawnee Pine 2021 Residential Service 5,186 21,157 11,212 10,544 36,122 16,008 15,949 52,301 171,185 8,420 Commercial & Industrial 1,805 1,195 710 2,246 2,307 697 3,134 2,833 17,512 616 Other 1,252 3,055 709 195 439 1,020 - 2,546 2,040 226 Total Consumers Served 8,243 25,407 12,631 12,985 38,868 17,725 19,083 57,680 190,737 9,262 2020 Residential Service 5,172 20,953 11,035 10,475 35,348 15,733 15,755 51,565 167,510 8,290 Commercial & Industrial 1,776 1,169 691 2,161 2,367 662 3,007 2,759 17,259 615 Other 1,231 3,017 648 193 434 1,010 - 2,498 2,037 220 Total Consumers Served 8,179 25,139 12,374 12,829 38,149 17,405 18,762 56,822 186,806 9,125 2019 Residential Service 5,160 20,900 10,934 10,447 34,834 15,536 15,632 50,980 164,076 8,165 Commercial & Industrial 1,747 1,161 679 2,093 2,364 626 2,923 2,690 16,961 611 Other 1,207 2,960 624 194 442 994 - 2,449 2,016 217 Total Consumers Served 8,114 25,021 12,237 12,734 37,640 17,156 18,555 56,119 183,053 8,993 Snapping Southern Three Tri- MEMBER Shoals Rivers Sumter Notch County Upson Walton Washington TOTAL 2021 Residential Service 98,760 19,274 14,838 13,607 20,208 8,666 124,848 15,118 1,825,876 Commercial & Industrial 4,279 1,102 5,161 482 2,149 552 8,524 678 162,641 Other 1,379 21 860 1,027 - 137 1,482 143 41,268 Total Consumers Served 104,418 20,397 20,859 15,116 22,357 9,355 134,854 15,939 2,029,785 2020 Residential Service 96,969 18,855 14,777 13,504 19,855 8,525 122,399 14,991 1,792,237 Commercial & Industrial 4,199 1,081 5,093 477 2,122 545 8,268 621 159,081 Other 1,350 21 837 1,012 - 140 1,674 132 40,809 Total Consumers Served 102,518 19,957 20,707 14,993 21,977 9,210 132,341 15,744 1,992,127 2019 Residential Service 95,317 18,490 14,730 13,309 19,649 8,462 120,480 14,872 1,763,786 Commercial & Industrial 4,135 1,069 5,062 472 2,101 555 8,153 601 156,701 Other 1,324 21 806 981 - 133 1,680 130 40,008 Total Consumers Served 100,776 19,580 20,598 14,762 21,750 9,150 130,313 15,603 1,960,495

FINANCIAL AND STATISTICAL INFORMATION FOR THE 38 MEMBERS OF OGLETHORPE POWER CORPORATION Table 3 ANNUAL MWh SALES BY CONSUMER CLASS OF EACH MEMBER Central Coweta- Altamaha Amicalola Canoochee Carroll Georgia Coastal Cobb Colquitt Fayette Diverse 2021 Residential Service 235,684 681,433 299,920 712,650 836,527 273,499 2,516,660 889,519 1,139,558 447,099 Commercial & Industrial 176,729 117,260 134,211 412,211 458,238 247,070 1,131,685 286,853 462,301 206,192 Other 7,264 92 15,276 5,777 3,622 2,066 230,838 74,793 6,721 36,030 Total MWh Sales 419,677 798,784 449,408 1,130,638 1,298,387 522,636 3,879,183 1,251,165 1,608,580 689,321 2020 Residential Service 239,873 641,083 296,717 677,457 820,697 269,638 2,543,578 880,402 1,111,393 441,588 Commercial & Industrial 172,340 109,568 131,095 372,821 434,170 235,347 1,116,709 284,411 436,835 201,968 Other 9,625 95 14,744 5,216 3,524 2,107 220,365 86,445 6,956 39,248 Total MWh Sales 421,837 750,747 442,556 1,055,494 1,258,391 507,092 3,880,653 1,251,259 1,555,184 682,804 2019 Residential Service 240,929 666,875 295,932 704,773 834,284 257,810 2,624,574 891,503 1,149,419 452,653 Commercial & Industrial 178,404 119,378 127,780 388,212 460,689 253,956 1,210,103 295,643 466,686 209,021 Other 12,376 134 18,128 6,725 3,808 2,529 250,006 110,243 7,472 45,664 Total MWh Sales 431,709 786,387 441,840 1,099,710 1,298,781 514,295 4,084,682 1,297,389 1,623,576 707,339 Little Excelsior Flint Grady GreyStone Habersham Hart Irwin Jackson Jefferson Ocmulgee 2021 Residential Service 317,664 1,164,173 247,692 1,829,269 411,491 392,546 134,254 3,113,308 436,444 127,152 Commercial & Industrial 69,517 612,517 41,145 1,042,924 99,702 205,795 30,989 2,013,130 138,498 48,226 Other 4,191 38,189 14,748 11,226 47 643 16,645 304,339 18,232 4,137 Total MWh Sales 391,372 1,814,879 303,585 2,883,418 511,239 598,984 181,888 5,430,778 593,174 179,515 2020 Residential Service 319,106 1,176,028 246,250 1,776,843 408,915 378,774 133,847 3,105,148 437,678 126,159 Commercial & Industrial 66,862 589,703 39,039 988,478 90,821 199,726 30,832 1,952,614 120,962 49,393 Other 6,695 42,763 17,776 12,969 6,717 621 32,714 281,927 20,704 6,750 Total MWh Sales 392,663 1,808,495 303,065 2,778,290 506,453 579,120 197,394 5,339,689 579,344 182,302 2019 Residential Service 319,103 1,171,442 252,909 1,828,915 406,101 385,131 136,731 3,161,520 448,435 128,863 Commercial & Industrial 71,620 620,395 44,127 1,022,482 102,485 202,778 32,844 2,062,290 123,937 53,397 Other 7,138 55,144 20,882 14,605 94 786 37,740 304,513 25,502 9,015 Total MWh Sales 397,861 1,846,981 317,917 2,866,003 508,679 588,695 207,315 5,528,323 597,875 191,275

Table 3 (Continued) Middle Slash Georgia Mitchell Ocmulgee Oconee Okefenoke Planters Rayle Satilla Sawnee Pine 2021 Residential Service 73,594 291,274 129,348 145,920 504,382 227,976 203,603 750,190 2,390,472 109,569 Commercial & Industrial 42,771 75,326 46,076 105,309 80,072 34,091 67,885 325,764 1,009,171 72,678 Other 14,370 50,154 6,789 4,292 16,060 20,083 - 34,216 182,526 3,932 Total MWh Sales 130,736 416,754 182,214 255,521 600,514 282,150 271,487 1,110,170 3,582,168 186,179 2020 Residential Service 72,274 289,601 125,815 144,650 509,397 225,017 201,446 735,093 2,365,426 107,312 Commercial & Industrial 42,768 76,984 47,355 106,722 81,739 32,328 67,764 318,372 972,180 73,535 Other 24,957 69,919 10,273 6,007 15,983 26,487 - 42,805 166,606 4,345 Total MWh Sales 139,998 436,503 183,443 257,378 607,119 283,832 269,211 1,096,270 3,504,212 185,193 2019 Residential Service 75,630 298,611 131,456 150,414 494,842 228,886 206,767 746,215 2,428,883 109,246 Commercial & Industrial 45,994 77,321 49,619 116,751 76,708 30,170 66,234 327,777 1,048,639 67,667 Other 33,316 81,802 14,511 8,262 17,482 34,075 - 48,105 179,062 5,789 Total MWh Sales 154,940 457,734 195,586 275,428 589,033 293,131 273,000 1,122,096 3,656,585 182,703 Snapping Southern Three Tri- MEMBER Shoals Rivers Sumter Notch County Upson Walton Washington TOTAL 2021 Residential Service 1,527,814 281,221 228,111 145,484 277,007 112,083 1,826,312 184,299 25,615,201 Commercial & Industrial 461,786 55,928 87,885 28,703 102,432 16,831 938,130 163,586 11,649,614 Other 18,286 4,501 29,817 34,381 - 2,572 55,660 5,311 1,277,828 Total MWh Sales 2,007,886 341,650 345,813 208,568 379,438 131,486 2,820,102 353,196 38,542,643 2020 Residential Service 1,467,869 278,542 224,260 144,233 277,714 110,101 1,812,514 184,787 25,307,226 Commercial & Industrial 434,257 53,055 87,258 28,147 101,207 14,944 692,403 151,802 11,006,513 Other 18,245 4,381 37,320 47,798 - 2,483 67,425 6,609 1,369,607 Total MWh Sales 1,920,371 335,978 348,838 220,178 378,921 127,528 2,572,342 343,198 37,683,346 2019 Residential Service 1,532,624 290,391 231,701 149,558 293,503 114,580 1,861,914 189,863 25,892,987 Commercial & Industrial 466,838 54,236 92,649 25,685 107,708 15,501 692,079 165,573 11,573,381 Other 18,191 5,354 44,913 51,141 - 2,863 75,600 8,130 1,561,101 Total MWh Sales 2,017,653 349,981 369,264 226,385 401,211 132,945 2,629,594 363,567 39,027,470

FINANCIAL AND STATISTICAL INFORMATION FOR THE 38 MEMBERS OF OGLETHORPE POWER CORPORATION Table 4 ANNUAL REVENUES BY CONSUMER CLASS OF EACH MEMBER Central Coweta- Altamaha Amicalola Canoochee Carroll Georgia Coastal Cobb Colquitt Fayette Diverse 2021 Residential Service $33,564,038 $76,406,079 $36,890,611 $85,335,988 $90,010,762 $37,630,443 $297,411,036 $97,471,103 $129,375,339 $66,630,291 Commercial & Industrial 17,186,413 14,790,193 11,033,271 31,220,869 35,447,473 23,474,737 110,121,821 26,782,676 45,210,012 21,300,819 Other 913,432 27,940 2,019,448 948,985 903,728 397,225 22,320,434 8,379,370 2,041,411 4,806,178 Total Electric Sales $51,663,883 $91,224,212 $49,943,330 $117,505,842 $126,361,963 $61,502,405 $429,853,291 $132,633,149 $176,626,762 $92,737,288 Other Operating Revenue 806,594 (46,600) 10,542,687 6,065,971 7,203,320 866,251 9,226,399 3,442,407 3,246,149 2,973,705 Total Operating Revenue $52,470,477 $91,177,612 $60,486,017 $123,571,813 $133,565,283 $62,368,656 $439,079,690 $136,075,556 $179,872,911 $95,710,993 2020 Residential Service $32,105,318 $72,888,512 $36,723,596 $82,079,923 $86,027,796 $36,923,668 $294,194,966 $92,307,200 $123,733,422 $63,885,361 Commercial & Industrial 16,892,426 13,872,280 10,643,640 29,835,106 32,933,177 22,534,941 107,503,767 25,066,207 41,970,853 20,396,185 Other 1,159,794 27,980 2,161,442 877,493 818,416 395,366 21,120,519 9,068,749 1,962,648 5,134,294 Total Electric Sales $50,157,538 $86,788,772 $49,528,678 $112,792,522 $119,779,389 $59,853,975 $422,819,252 $126,442,156 $167,666,923 $89,415,840 Other Operating Revenue 295,933 3,218,356 10,136,532 5,604,455 (1,357,085) 656,034 7,911,894 2,717,768 5,182,920 7,122,381 Total Operating Revenue $50,453,471 $90,007,128 $59,665,210 $118,396,977 $118,422,304 $60,510,009 $430,731,146 $129,159,924 $172,849,843 $96,538,221 2019 Residential Service $32,685,358 $74,868,918 $36,640,315 $84,397,569 $85,009,865 $35,893,223 $291,307,996 $95,052,444 $129,192,456 $65,341,537 Commercial & Industrial 17,160,008 14,726,324 11,252,179 30,783,909 34,530,908 23,403,673 111,724,008 26,499,496 44,926,944 20,893,222 Other 1,429,735 34,276 2,354,480 978,401 756,261 441,378 22,672,841 11,863,430 1,932,003 5,840,411 Total Electric Sales $51,275,101 $89,629,518 $50,246,974 $116,159,879 $120,297,034 $59,738,274 $425,704,845 $133,415,370 $176,051,403 $92,075,170 Other Operating Revenue 597,618 39,731 9,581,336 3,682,112 (1,741,117) (3,756,934) 9,440,453 3,587,873 971,797 2,301,453 Total Operating Revenue $51,872,719 $89,669,249 $59,828,310 $119,841,991 $118,555,917 $55,981,340 $435,145,298 $137,003,243 $177,023,200 $94,376,623 Little Excelsior Flint Grady GreyStone Habersham Hart Irwin Jackson Jefferson Ocmulgee 2021 Residential Service $34,338,592 $151,587,175 $34,177,652 $189,997,776 $52,957,313 $49,418,392 $19,019,786 $352,599,873 $54,384,738 $17,782,609 Commercial & Industrial 7,697,465 63,358,835 4,310,320 96,332,535 11,482,430 24,691,411 3,619,982 191,353,853 13,194,552 4,754,418 Other 773,208 5,557,184 2,368,854 3,157,114 12,836 69,919 3,022,144 35,916,869 2,817,874 720,184 Total Electric Sales $42,809,265 $220,503,194 $40,856,826 $289,487,425 $64,452,579 $74,179,722 $25,661,912 $579,870,595 $70,397,164 $23,257,211 Other Operating Revenue 293,183 7,963,214 924,099 17,549,540 4,099,002 2,821,911 2,874,120 3,995,007 2,789,387 39,693 Total Operating Revenue $43,102,448 $228,466,408 $41,780,925 $307,036,965 $68,551,581 $77,001,633 $28,536,032 $583,865,602 $73,186,551 $23,296,904 2020 Residential Service $32,887,036 $147,752,394 $34,214,217 $185,908,336 $52,910,424 $46,115,527 $18,557,194 $355,099,317 $53,786,609 $16,825,846 Commercial & Industrial 7,106,560 58,743,762 4,157,541 92,644,991 10,872,879 22,971,749 3,473,997 188,217,738 12,085,451 4,804,263 Other 1,009,893 5,797,905 2,662,554 2,832,696 984,574 64,755 4,838,314 34,943,277 3,048,652 1,008,946 Total Electric Sales $41,003,489 $212,294,061 $41,034,312 $281,386,023 $64,767,877 $69,152,031 $26,869,505 $578,260,332 $68,920,712 $22,639,055 Other Operating Revenue (2,283,074) 5,657,457 1,380,823 5,717,967 2,360,186 2,580,999 438,985 17,549,022 2,487,567 329,921 Total Operating Revenue $38,720,415 $217,951,518 $42,415,135 $287,103,990 $67,128,063 $71,733,030 $27,308,490 $595,809,354 $71,408,279 $22,968,976 2019 Residential Service $33,423,559 $147,876,722 $32,209,023 $184,433,166 $53,162,849 $50,633,076 $19,245,457 $351,619,943 $53,774,702 $17,652,798 Commercial & Industrial 7,559,160 61,872,840 4,347,780 90,175,899 12,042,920 25,107,763 3,756,687 193,094,163 12,083,016 5,023,280 Other 1,044,094 6,948,080 2,736,639 2,918,606 10,363 84,338 5,590,672 35,453,189 3,283,628 1,283,683 Total Electric Sales $42,026,813 $216,697,642 $39,293,442 $277,527,671 $65,216,132 $75,825,177 $28,592,816 $580,167,295 $69,141,346 $23,959,761 Other Operating Revenue (2,274,383) 6,056,910 1,233,014 7,060,003 2,057,968 (5,151,886) (2,098,620) 7,726,283 2,881,651 443,968 Total Operating Revenue $39,752,430 $222,754,552 $40,526,456 $284,587,674 $67,274,100 $70,673,291 $26,494,196 $587,893,578 $72,022,997 $24,403,729

Table 4 (Continued) Middle Slash Georgia Mitchell Ocmulgee Oconee Okefenoke Planters Rayle Satilla Sawnee Pine 2021 Residential Service $10,183,787 $42,971,237 $16,694,199 $19,691,458 $63,214,287 $30,227,476 $26,888,343 $88,440,099 $285,469,555 $14,165,755 Commercial & Industrial 5,823,549 9,285,528 4,871,181 9,886,366 8,221,611 3,573,505 8,565,018 23,248,861 102,551,294 7,189,949 Other 2,596,794 7,439,203 1,128,389 565,585 1,894,492 3,114,719 - 5,121,754 18,485,060 577,905 Total Electric Sales $18,604,130 $59,695,968 $22,693,769 $30,143,409 $73,330,390 $36,915,700 $35,453,361 $116,810,714 $406,505,909 $21,933,609 Other Operating Revenue 1,174,087 1,351,327 735,654 (311,332) 2,252,283 (1,858,873) 335,510 3,466,205 (6,916,291) 130,123 Total Operating Revenue $19,778,217 $61,047,295 $23,429,423 $29,832,077 $75,582,673 $35,056,827 $35,788,871 $120,276,919 $399,589,618 $22,063,732 2020 Residential Service $9,305,779 $41,737,073 $16,487,631 $19,003,717 $63,613,395 $29,864,226 $26,351,947 $82,243,351 $268,347,683 $13,683,306 Commercial & Industrial 5,370,804 9,356,554 4,764,109 9,764,392 8,131,784 3,419,230 8,428,571 21,731,177 96,208,244 7,323,180 Other 3,906,149 9,794,705 1,610,536 700,107 1,854,977 3,845,967 - 5,284,985 18,156,173 584,454 Total Electric Sales $18,582,732 $60,888,332 $22,862,276 $29,468,216 $73,600,156 $37,129,423 $34,780,518 $109,259,513 $382,712,100 $21,590,940 Other Operating Revenue 532,323 2,337,166 640,556 (1,248,202) 615,441 (1,107,333) 965,402 3,295,836 (7,632,635) 581,548 Total Operating Revenue $19,115,055 $63,225,498 $23,502,832 $28,220,014 $74,215,597 $36,022,090 $35,745,920 $112,555,349 $375,079,465 $22,172,488 2019 Residential Service $9,616,936 $41,594,118 $16,710,997 $19,471,885 $62,227,116 $29,813,748 $26,541,828 $84,902,534 $252,169,482 $13,714,331 Commercial & Industrial 5,887,308 8,969,321 4,987,497 10,412,513 8,180,165 3,261,252 8,239,515 23,018,348 95,598,632 6,758,631 Other 4,881,324 10,957,963 2,063,394 911,877 1,953,193 4,628,734 - 6,152,839 17,638,710 697,412 Total Electric Sales $20,385,568 $61,521,402 $23,761,888 $30,796,275 $72,360,474 $37,703,734 $34,781,343 $114,073,721 $365,406,824 $21,170,374 Other Operating Revenue (987,647) 1,990,693 708,353 (1,644,363) 848,147 (1,247,006) 1,004,800 3,347,448 (4,349,572) 458,858 Total Operating Revenue $19,397,921 $63,512,095 $24,470,241 $29,151,912 $73,208,621 $36,456,728 $35,786,143 $117,421,169 $361,057,252 $21,629,232 Snapping Southern Three Tri- MEMBER Shoals Rivers Sumter Notch County Upson Walton Washington TOTAL 2021 Residential Service $160,688,027 $37,475,681 $29,719,439 $20,469,574 $36,797,298 $12,415,924 $218,337,156 $23,476,636 $3,044,315,527 Commercial & Industrial 38,738,312 6,210,131 12,429,415 4,189,777 10,298,146 1,896,719 81,564,442 14,229,106 1,110,136,995 Other 3,398,833 442,143 4,673,254 6,820,441 - 325,447 8,052,283 727,268 162,537,907 Total Electric Sales $202,825,172 $44,127,955 $46,822,108 $31,479,792 $47,095,444 $14,638,090 $307,953,881 $38,433,010 $4,316,990,429 Other Operating Revenue 7,312,526 1,071,173 999,552 486,018 1,316,143 435,564 29,595,170 908,132 130,159,010 Total Operating Revenue $210,137,698 $45,199,128 $47,821,660 $31,965,810 $48,411,587 $15,073,654 $337,549,051 $39,341,142 $4,447,149,439 2020 Residential Service $146,415,651 $35,844,380 $29,418,721 $20,008,108 $35,620,043 $12,376,327 $211,515,231 $22,538,567 $2,949,301,798 Commercial & Industrial 35,417,245 5,650,288 12,299,707 4,251,948 9,535,209 1,757,642 67,420,519 12,326,140 1,049,884,256 Other 3,355,681 482,655 5,532,796 8,535,010 - 304,810 9,607,775 783,312 174,258,359 Total Electric Sales $185,188,577 $41,977,323 $47,251,224 $32,795,066 $45,155,252 $14,438,779 $288,543,525 $35,648,019 $4,173,444,413 Other Operating Revenue 4,024,433 943,569 144,055 326,453 1,287,009 648,961 26,809,219 865,747 111,738,589 Total Operating Revenue $189,213,010 $42,920,892 $47,395,279 $33,121,519 $46,442,261 $15,087,740 $315,352,744 $36,513,766 $4,285,183,002 2019 Residential Service $153,277,676 $36,659,428 $30,436,355 $20,133,741 $37,109,095 $12,928,433 $213,163,820 $22,681,031 $2,957,573,530 Commercial & Industrial 37,474,717 5,778,139 12,884,388 3,855,058 10,312,798 1,830,157 68,713,880 12,894,171 1,080,020,669 Other 3,304,542 483,623 6,298,659 8,564,842 - 372,363 10,135,153 892,252 187,593,388 Total Electric Sales $194,056,935 $42,921,190 $49,619,402 $32,553,641 $47,421,893 $15,130,953 $292,012,853 $36,467,454 $4,225,187,587 Other Operating Revenue (2,142,904) 1,057,853 (1,722,384) 642,453 1,212,229 378,261 20,316,388 886,559 63,397,396 Total Operating Revenue $191,914,031 $43,979,043 $47,897,018 $33,196,094 $48,634,122 $15,509,214 $312,329,241 $37,354,013 $4,288,584,983

FINANCIAL AND STATISTICAL INFORMATION FOR THE 38 MEMBERS OF OGLETHORPE POWER CORPORATION Table 5 SUMMARY OF OPERATING RESULTS OF EACH MEMBER Central Coweta- Altamaha Amicalola Canoochee Carroll Georgia Coastal Cobb Colquitt Fayette Diverse 2021 Operating Revenue & Patronage Capital $52,470,476 $91,177,614 $60,486,017 $123,571,813 $133,565,283 $62,368,655 $439,079,690 $136,075,556 $179,872,911 $95,710,993 Depreciation and Amortization 4,357,572 7,267,588 6,025,422 9,984,048 8,364,722 4,393,308 32,333,041 10,890,404 11,929,991 9,843,373 Other Operating Expenses 44,159,823 83,054,400 50,956,279 100,092,448 116,046,167 49,419,240 373,298,742 119,968,126 158,706,395 81,093,870 Electric Operating Margin $3,953,081 $855,626 $3,504,316 $13,495,317 $9,154,394 $8,556,107 $33,447,907 $5,217,026 $9,236,525 $4,773,750 Other Income 1,112,678 5,622,541 1,152,763 987,606 2,876,507 1,083,982 69,247,915 2,040,411 6,560,069 1,698,945 Gross Operating Margin $5,065,759 $6,478,167 $4,657,079 $14,482,923 $12,030,901 $9,640,089 $102,695,822 $7,257,437 $15,796,594 $6,472,695 Interest on Long-term Debt 1,715,240 2,852,304 2,102,589 4,042,744 4,916,054 2,455,293 19,164,118 4,583,870 4,641,091 5,577,757 Other Deductions 43,311 26,853 10,123 5,085 263,377 7,437 687,053 - 670,272 26,809 Net Margins $3,307,208 $3,599,010 $2,544,367 $10,435,094 $6,851,470 $7,177,359 $82,844,651 $2,673,567 $10,485,231 $868,129 2020 Operating Revenue & Patronage Capital $50,453,474 $90,007,128 $59,665,210 $118,396,975 $118,422,304 $60,510,009 $430,731,145 $129,159,924 $172,849,844 $96,538,221 Depreciation and Amortization 4,167,374 6,912,180 5,868,562 9,585,535 7,928,944 4,132,942 32,436,976 10,401,376 11,581,685 10,421,272 Other Operating Expenses 42,131,986 79,319,293 49,250,931 95,171,701 102,918,321 48,065,693 368,410,352 109,949,058 151,023,398 80,165,101 Electric Operating Margin $4,154,114 $3,775,655 $4,545,717 $13,639,739 $7,575,039 $8,311,374 $29,883,817 $8,809,490 $10,244,761 $5,951,848 Other Income 1,688,397 3,360,899 1,199,602 1,671,223 3,552,898 1,136,446 39,122,045 2,150,674 10,045,610 1,263,941 Gross Operating Margin $5,842,511 $7,136,554 $5,745,319 $15,310,962 $11,127,937 $9,447,820 $69,005,862 $10,960,164 $20,290,371 $7,215,789 Interest on Long-term Debt 1,723,771 2,447,584 2,306,658 4,121,289 5,421,390 2,418,250 19,364,278 4,593,728 6,109,128 5,522,036 Other Deductions 12,485 67,776 4,944 15,219 141,126 132,606 234,717 - 257,210 28,648 Net Margins $4,106,255 $4,621,194 $3,433,717 $11,174,454 $5,565,421 $6,896,964 $49,406,867 $6,366,436 $13,924,033 $1,665,105 2019 Operating Revenue & Patronage Capital $51,872,719 $89,669,249 $59,828,310 $119,841,992 $118,555,917 $55,981,340 $435,145,298 $137,003,243 $177,023,200 $94,376,623 Depreciation and Amortization 3,946,602 6,651,952 5,751,816 9,311,574 7,485,458 3,782,692 32,739,463 9,755,615 11,012,348 9,813,601 Other Operating Expenses 44,488,912 78,958,360 48,539,416 100,591,952 102,583,367 46,932,224 358,379,038 116,077,827 147,878,865 78,917,247 Electric Operating Margin $3,437,205 $4,058,937 $5,537,078 $9,938,466 $8,487,092 $5,266,424 $44,026,798 $11,169,801 $18,131,987 $5,645,775 Other Income 1,634,198 2,496,362 1,490,623 2,442,425 4,496,416 1,095,114 29,155,895 1,969,997 8,328,474 1,803,391 Gross Operating Margin $5,071,403 $6,555,299 $7,027,701 $12,380,891 $12,983,508 $6,361,538 $73,182,693 $13,139,798 $26,460,461 $7,449,166 Interest on Long-term Debt 1,722,105 3,157,181 2,542,410 4,445,714 5,567,179 2,445,489 20,863,240 4,606,791 6,803,263 5,601,151 Other Deductions 25,308 122,068 7,147 64,098 342,775 14,614 1,331,599 - 343,379 13,328 Net Margins $3,323,990 $3,276,050 $4,478,144 $7,871,079 $7,073,554 $3,901,435 $50,987,853 $8,533,007 $19,313,819 $1,834,687 Little Excelsior Flint Grady GreyStone Habersham Hart Irwin Jackson Jefferson Ocmulgee 2021 Operating Revenue & Patronage Capital $43,102,448 $228,466,408 $41,780,925 $307,036,964 $68,551,581 $77,001,634 $28,536,032 $583,865,602 $73,185,551 $23,296,905 Depreciation and Amortization 3,097,051 15,759,780 3,585,669 19,075,276 6,727,175 5,707,348 3,374,195 38,596,482 6,002,989 2,209,116 Other Operating Expenses 38,828,109 200,322,301 33,608,001 269,650,406 57,488,913 62,900,405 21,698,943 516,642,333 61,426,705 19,580,951 Electric Operating Margin $1,177,288 $12,384,327 $4,587,255 $18,311,282 $4,335,493 $8,393,881 $3,462,894 $28,626,787 $5,755,857 $1,506,838 Other Income 1,565,650 1,637,405 801,223 19,912,039 2,477,289 4,069,883 538,075 17,854,839 (1,181,369) 657,113 Gross Operating Margin $2,742,938 $14,021,732 $5,388,478 $38,223,321 $6,812,782 $12,463,764 $4,000,969 $46,481,626 $4,574,488 $2,163,951 Interest on Long-term Debt 1,000,159 4,958,399 1,521,747 9,832,261 2,354,627 1,935,557 1,835,611 14,992,742 2,218,962 1,000,000 Other Deductions - 431,511 156,321 115,002 274,874 2,859 62,304 - 59,086 - Net Margins $1,742,779 $8,631,822 $3,710,410 $28,276,058 $4,183,281 $10,525,348 $2,103,054 $31,488,884 $2,296,440 $1,163,951 2020 Operating Revenue & Patronage Capital $38,720,416 $217,951,518 $42,415,133 $287,103,981 $67,128,063 $71,733,031 $27,308,490 $595,809,354 $71,408,278 $22,968,977 Depreciation and Amortization 2,991,389 15,250,294 3,516,670 17,298,454 6,397,382 5,504,610 3,253,905 37,589,426 5,808,451 1,898,501 Other Operating Expenses 34,249,232 189,649,248 33,575,781 247,918,425 56,109,944 58,790,434 21,086,743 524,379,528 61,117,716 18,899,345 Electric Operating Margin $1,479,795 $13,051,976 $5,322,682 $21,887,102 $4,620,737 $7,437,987 $2,967,842 $33,840,400 $4,482,111 $2,171,131 Other Income 1,415,324 1,944,945 2,682,171 4,496,708 2,422,410 4,367,787 634,439 18,997,728 261,894 269,589 Gross Operating Margin $2,895,119 $14,996,921 $8,004,853 $26,383,810 $7,043,147 $11,805,774 $3,602,281 $52,838,128 $4,744,005 $2,440,720 Interest on Long-term Debt 1,043,309 6,244,800 1,668,125 10,035,502 2,904,396 2,327,222 1,871,066 16,835,438 2,356,844 1,200,000 Other Deductions - 490,650 136,144 46,535 185,146 800 34,844 3,884 104,877 - Net Margins $1,851,810 $8,261,471 $6,200,584 $16,301,773 $3,953,605 $9,477,752 $1,696,371 $35,998,806 $2,282,284 $1,240,720 2019 Operating Revenue & Patronage Capital $39,752,431 $222,754,550 $40,526,456 $284,587,674 $67,274,100 $70,673,291 $26,494,196 $587,893,578 $72,022,996 $23,665,085 Depreciation and Amortization 2,872,212 14,648,234 3,466,874 16,884,241 6,112,359 5,293,781 3,151,210 37,478,298 5,673,181 1,770,809 Other Operating Expenses 35,317,178 195,658,770 34,342,115 241,128,021 57,005,074 58,112,387 20,688,383 516,274,017 60,872,414 19,711,635 Electric Operating Margin $1,563,041 $12,447,546 $2,717,467 $26,575,412 $4,156,667 $7,267,123 $2,654,603 $34,141,263 $5,477,401 $2,182,641 Other Income 1,868,819 3,042,135 2,519,078 8,296,768 3,165,059 4,658,522 626,035 24,932,374 785,464 237,781 Gross Operating Margin $3,431,860 $15,489,681 $5,236,545 $34,872,180 $7,321,726 $11,925,645 $3,280,638 $59,073,637 $6,262,865 $2,420,422 Interest on Long-term Debt 1,291,067 6,738,843 1,540,655 10,091,102 3,268,555 3,001,394 1,943,799 21,574,579 2,882,130 1,416,000 Other Deductions - 578,355 636,628 317,369 13,412 6,478 68,098 124,027 98,440 - Net Margins $2,140,793 $8,172,483 $3,059,262 $24,463,709 $4,039,759 $8,917,773 $1,268,741 $37,375,031 $3,282,295 $1,004,422

Table 5 (Continued) Middle Slash Georgia Mitchell Ocmulgee Oconee Okefenoke Planters Rayle Satilla Sawnee Pine 2021 Operating Revenue & Patronage Capital $19,778,218 $61,047,295 $23,432,378 $29,832,077 $73,582,674 $36,854,842 $35,788,871 $120,276,917 $399,589,618 $22,063,730 Depreciation and Amortization 1,981,542 4,610,725 1,694,580 2,393,510 5,993,376 2,703,177 2,987,839 7,943,365 22,186,511 1,263,554 Other Operating Expenses 16,409,661 51,740,825 20,382,093 25,145,169 62,751,579 29,972,252 29,544,524 104,305,004 343,161,555 17,871,152 Electric Operating Margin $1,387,015 $4,695,745 $1,355,705 $2,293,398 $4,837,719 $4,179,413 $3,256,508 $8,028,548 $34,241,552 $2,929,024 Other Income 396,674 1,420,160 181,261 762,113 3,362,998 255,892 950,836 1,914,045 4,639,601 511,447 Gross Operating Margin $1,783,689 $6,115,905 $1,536,966 $3,055,511 $8,200,717 $4,435,305 $4,207,344 $9,942,593 $38,881,153 $3,440,471 Interest on Long-term Debt 974,539 2,576,283 217,650 1,454,874 3,267,113 1,064,662 1,468,661 3,748,871 9,650,691 808,040 Other Deductions 60,262 133,152 2,171 4,220 201,671 3,658 28,989 221,212 10,167 754,717 Net Margins $748,888 $3,406,470 $1,317,145 $1,596,417 $4,731,933 $3,366,985 $2,709,694 $5,972,510 $29,220,295 $1,877,714 2020 Operating Revenue & Patronage Capital $19,115,055 $63,225,498 $23,502,832 $28,220,014 $72,715,598 $36,022,090 $35,745,920 $112,555,347 $375,079,465 $22,172,487 Depreciation and Amortization 1,928,036 4,445,748 1,645,054 2,327,698 5,827,368 2,624,468 3,140,910 7,599,074 21,248,227 1,218,823 Other Operating Expenses 15,347,508 50,557,965 18,990,444 23,480,794 61,025,117 30,294,946 29,010,121 98,049,397 331,810,023 17,486,856 Electric Operating Margin $1,839,511 $8,221,785 $2,867,334 $2,411,522 $5,863,113 $3,102,676 $3,594,889 $6,906,876 $22,021,215 $3,466,808 Other Income 427,240 404,234 637,953 755,029 1,411,222 1,763,099 1,011,452 2,575,692 6,278,841 541,292 Gross Operating Margin $2,266,751 $8,626,019 $3,505,287 $3,166,551 $7,274,335 $4,865,775 $4,606,341 $9,482,568 $28,300,056 $4,008,100 Interest on Long-term Debt 999,219 2,550,544 633,152 1,584,300 3,278,307 1,247,064 1,641,929 4,160,602 10,232,977 795,319 Other Deductions 41,955 220,822 4,321 9,222 187,059 - 10,973 93,192 288,829 750,000 Net Margins $1,225,577 $5,854,653 $2,867,814 $1,573,029 $3,808,969 $3,618,711 $2,953,439 $5,228,774 $17,778,250 $2,462,781 2019 Operating Revenue & Patronage Capital $19,397,921 $63,512,095 $24,470,241 $29,151,912 $73,208,621 $36,456,731 $35,786,143 $117,421,165 $361,057,252 $21,629,231 Depreciation and Amortization 1,849,023 4,297,045 1,595,130 2,254,170 5,580,465 2,537,821 3,021,441 7,392,843 20,072,207 1,122,854 Other Operating Expenses 15,613,262 54,791,290 19,836,823 24,419,644 61,156,288 30,714,821 29,061,389 101,113,457 318,136,532 17,090,282 Electric Operating Margin $1,935,636 $4,423,760 $3,038,288 $2,478,098 $6,471,868 $3,204,089 $3,703,313 $8,914,865 $22,848,513 $3,416,095 Other Income 409,426 1,600,244 1,023,493 856,646 (724,025) 2,028,693 1,220,232 3,176,081 10,074,502 428,711 Gross Operating Margin $2,345,062 $6,024,004 $4,061,781 $3,334,744 $5,747,843 $5,232,782 $4,923,545 $12,090,946 $32,923,015 $3,844,806 Interest on Long-term Debt 992,774 2,461,274 968,554 1,678,449 3,512,836 1,514,305 1,845,326 4,454,936 12,003,299 794,744 Other Deductions 136,308 693,161 16,650 1,677 83,040 - 3,084 119,834 127,200 750,000 Net Margins $1,215,980 $2,869,569 $3,076,577 $1,654,618 $2,151,967 $3,718,477 $3,075,135 $7,516,176 $20,792,516 $2,300,062 Snapping Southern Three Tri- MEMBER Shoals Rivers Sumter Notch County Upson Walton Washington TOTAL 2021 Operating Revenue & Patronage Capital $210,137,699 $45,199,127 $47,821,664 $31,965,809 $48,411,586 $15,073,652 $337,549,051 $39,341,139 $4,446,949,405 Depreciation and Amortization 11,485,998 3,416,694 4,096,515 2,574,808 4,227,537 973,761 16,038,068 2,890,972 308,987,082 Other Operating Expenses 192,550,408 39,254,335 40,080,734 27,049,533 36,765,257 13,199,446 314,341,252 34,925,135 3,858,392,471 Electric Operating Margin $6,101,293 $2,528,098 $3,644,415 $2,341,468 $7,418,792 $900,445 $7,169,731 $1,525,032 $279,569,852 Other Income 2,781,657 435,299 1,305,154 646,324 (1,327,995) 378,900 7,311,106 852,968 167,494,004 Gross Operating Margin $8,882,950 $2,963,397 $4,949,569 $2,987,792 $6,090,797 $1,279,345 $14,480,837 $2,378,000 $447,063,856 Interest on Long-term Debt 4,035,854 1,575,534 1,976,951 1,699,418 2,441,356 200,098 5,055,913 1,326,124 137,243,757 Other Deductions 55,164 - 72,330 22,402 19,097 25,101 167,237 - 4,623,827 Net Margins $4,791,932 $1,387,863 $2,900,288 $1,265,972 $3,630,344 $1,054,146 $9,257,687 $1,051,876 $305,196,272 2020 Operating Revenue & Patronage Capital $189,213,010 $42,920,892 $47,395,279 $33,121,519 $46,442,261 $15,087,745 $315,352,744 $36,513,765 $4,283,682,996 Depreciation and Amortization 11,169,486 3,239,695 3,894,093 2,479,809 4,205,901 927,658 15,337,295 2,796,474 299,001,745 Other Operating Expenses 172,389,703 34,770,610 39,763,305 27,594,193 33,783,127 12,338,146 285,828,457 31,714,799 3,686,417,741 Electric Operating Margin $5,653,821 $4,910,587 $3,737,881 $3,047,517 $8,453,233 $1,821,941 $14,186,992 $2,002,492 $298,263,510 Other Income 2,865,107 744,329 1,416,183 3,493,798 399,436 596,144 8,530,778 930,382 137,466,941 Gross Operating Margin $8,518,928 $5,654,916 $5,154,064 $6,541,315 $8,852,669 $2,418,084 $22,717,770 $2,932,874 $435,730,450 Interest on Long-term Debt 4,021,840 1,553,183 2,037,597 1,499,839 2,591,675 456,144 5,036,792 1,247,343 146,082,640 Other Deductions 117,697 - 30,652 321,709 23,574 18,183 159,366 - 4,175,165 Net Margins $4,379,391 $4,101,733 $3,085,815 $4,719,767 $6,237,420 $1,943,757 $17,521,612 $1,685,531 $285,472,645 2019 Operating Revenue & Patronage Capital $191,914,031 $43,979,044 $47,897,018 $33,196,094 $48,634,122 $15,509,213 $312,329,241 $37,360,120 $4,287,852,443 Depreciation and Amortization 11,098,796 3,018,986 3,799,553 2,383,112 4,112,932 900,573 14,908,434 2,700,132 290,247,837 Other Operating Expenses 174,118,647 35,994,082 40,274,973 27,888,366 34,881,629 12,905,796 282,406,096 32,524,414 3,675,384,993 Electric Operating Margin $6,696,588 $4,965,976 $3,822,492 $2,924,616 $9,639,561 $1,702,844 $15,014,711 $2,135,574 $322,219,614 Other Income 2,431,649 1,160,518 1,757,087 2,089,962 887,453 795,067 9,548,665 1,096,402 144,905,736 Gross Operating Margin $9,128,237 $6,126,494 $5,579,579 $5,014,578 $10,527,014 $2,497,911 $24,563,376 $3,231,976 $467,125,350 Interest on Long-term Debt 4,061,249 1,723,248 2,452,774 1,550,476 3,118,929 580,453 4,879,880 1,487,777 161,583,930 Other Deductions 97,029 - 278,707 938,371 67,412 15,086 182,672 - 7,617,354 Net Margins $4,969,959 $4,403,246 $2,848,098 $2,525,731 $7,340,673 $1,902,372 $19,500,824 $1,744,199 $297,924,065

FINANCIAL AND STATISTICAL INFORMATION FOR THE 38 MEMBERS OF OGLETHORPE POWER CORPORATION Table 6 CONDENSED BALANCE SHEET INFORMATION OF EACH MEMBER (as of December 31) Central Coweta- Altamaha Amicalola Canoochee Carroll Georgia Coastal Cobb Colquitt Fayette Diverse 2021 ASSETS Total Utility Plant (1) $148,212,395 $248,279,704 $167,770,781 $323,477,065 $299,153,030 $139,598,636 $986,191,276 $348,252,644 $412,001,682 $277,454,236 Depreciation 41,492,247 91,580,020 51,011,068 92,656,196 63,970,166 33,038,615 289,295,844 113,503,594 139,128,837 97,051,275 Net Plant 106,720,148 156,699,684 116,759,713 230,820,869 235,182,864 106,560,021 696,895,432 234,749,050 272,872,845 180,402,961 Other Assets 54,374,114 45,149,102 36,765,842 51,121,057 80,874,821 34,173,642 400,931,599 78,975,883 144,042,838 35,837,680 Total Assets $161,094,262 $201,848,786 $153,525,555 $281,941,926 $316,057,685 $140,733,663 $1,097,827,031 $313,724,933 $416,915,683 $216,240,641 EQUITY & LIABILITIES Equity $88,011,983 $81,097,276 $70,845,186 $126,840,419 $97,786,250 $56,355,574 $564,357,405 $138,898,489 $188,198,511 $72,104,987 Long-term Debt 55,417,383 73,989,675 54,767,552 124,144,796 151,173,121 68,572,500 382,090,190 122,847,254 136,365,969 119,310,020 Other Liabilities 17,664,896 46,761,835 27,912,817 30,956,711 67,098,314 15,805,589 151,379,436 51,979,190 92,351,203 24,825,634 Total Equity and Liabilities $161,094,262 $201,848,786 $153,525,555 $281,941,926 $316,057,685 $140,733,663 $1,097,827,031 $313,724,933 $416,915,683 $216,240,641 2020 ASSETS Total Utility Plant (1) $138,532,955 $235,984,228 $158,856,105 $309,846,692 $277,043,422 $130,715,506 $963,434,008 $328,905,467 $393,509,331 $264,849,924 Depreciation 38,283,109 87,855,607 47,704,130 87,890,521 60,656,156 30,410,041 280,856,941 104,103,479 132,504,549 91,278,147 Net Plant 100,249,846 148,128,621 111,151,975 221,956,171 216,387,266 100,305,465 682,577,067 224,801,988 261,004,782 173,571,777 Other Assets 57,582,711 33,633,543 35,053,348 55,148,976 75,437,215 31,965,660 405,725,071 74,352,452 136,778,788 39,780,692 Total Assets $157,832,557 $181,762,164 $146,205,323 $277,105,147 $291,824,481 $132,271,125 $1,088,302,138 $299,154,440 $397,783,570 $213,352,469 EQUITY & LIABILITIES Equity $85,162,297 $80,527,546 $69,053,287 $121,592,108 $93,634,641 $52,069,969 $441,992,625 $135,651,822 $181,336,925 $71,203,383 Long-term Debt 57,362,139 55,618,915 47,478,788 118,832,418 151,143,494 65,753,527 405,717,261 120,451,024 141,670,939 115,869,053 Other Liabilities 15,308,121 45,615,703 29,673,248 36,680,621 47,046,346 14,447,629 240,592,252 43,051,594 74,775,706 26,280,033 Total Equity and Liabilities $157,832,557 $181,762,164 $146,205,323 $277,105,147 $291,824,481 $132,271,125 $1,088,302,138 $299,154,440 $397,783,570 $213,352,469 2019 ASSETS Total Utility Plant (1) $132,841,049 $227,821,866 $152,556,866 $297,881,481 $258,402,925 $123,618,767 $932,582,516 $317,219,483 $378,761,564 $250,132,228 Depreciation 35,668,482 85,149,006 44,345,235 85,367,347 57,907,224 28,645,610 266,727,736 97,088,048 127,532,597 82,997,181 Net Plant 97,172,567 142,672,860 108,211,631 212,514,134 200,495,701 94,973,157 665,854,780 220,131,435 251,228,967 167,135,047 Other Assets 45,339,553 33,272,629 30,237,529 44,875,580 72,637,528 31,078,329 333,818,653 71,518,000 126,002,770 40,784,229 Total Assets $142,512,120 $175,945,489 $138,449,160 $257,389,714 $273,133,229 $126,051,486 $999,673,433 $291,649,435 $377,231,737 $207,919,276 EQUITY & LIABILITIES Equity $80,452,137 $78,152,363 $67,518,307 $115,395,750 $90,623,066 $47,532,571 $424,057,135 $132,734,560 $174,769,587 $70,174,989 Long-term Debt 49,047,311 52,421,624 50,649,465 104,242,245 139,465,807 62,670,528 400,291,787 117,542,627 156,563,177 111,729,471 Other Liabilities 13,012,672 45,371,502 20,281,388 37,751,719 43,044,356 15,848,387 175,324,510 41,372,248 45,898,973 26,014,816 Total Equity and Liabilities $142,512,120 $175,945,489 $138,449,160 $257,389,714 $273,133,229 $126,051,486 $999,673,433 $291,649,435 $377,231,737 $207,919,276 Footnotes: (1) Including construction work in progress.

Table 6 (Continued) Little Excelsior Flint Grady GreyStone Habersham Hart Irwin Jackson Jefferson Ocmulgee 2021 ASSETS Total Utility Plant (1) $98,185,339 $484,095,363 $121,118,711 $636,053,981 $204,630,282 $198,139,595 $110,147,432 $1,210,339,737 $199,293,533 $73,095,734 Depreciation 26,278,401 178,957,775 28,035,372 136,713,423 84,318,490 65,284,825 41,351,890 392,615,368 50,267,110 20,998,145 Net Plant 71,906,938 305,137,588 93,083,339 499,340,558 120,311,792 132,854,770 68,795,542 817,724,369 149,026,423 52,097,589 Other Assets 47,454,331 90,454,412 40,250,932 108,986,359 43,497,406 95,223,719 19,716,521 406,578,826 13,676,313 10,998,586 Total Assets $119,361,269 $395,592,000 $133,334,271 $608,326,917 $163,809,198 $228,078,489 $88,512,063 $1,224,303,195 $162,702,736 $63,096,175 EQUITY & LIABILITIES Equity $63,065,805 $151,710,954 $63,584,914 $295,596,622 $58,905,871 $113,647,701 $32,828,981 $562,158,310 $56,012,112 $25,706,482 Long-term Debt 31,698,488 $177,017,584 46,536,649 244,360,499 69,470,232 61,552,043 48,592,967 494,774,274 75,161,178 28,615,765 Other Liabilities 24,596,976 66,863,462 23,212,708 68,369,796 35,433,095 52,878,745 7,090,115 167,370,611 31,529,446 8,773,928 Total Equity and Liabilities $119,361,269 $395,592,000 $133,334,271 $608,326,917 $163,809,198 $228,078,489 $88,512,063 $1,224,303,195 $162,702,736 $63,096,175 2020 ASSETS Total Utility Plant (1) $93,665,370 $469,771,547 $117,401,828 $548,055,935 $187,440,225 $196,148,469 $106,019,106 $1,162,810,520 $193,108,618 $70,575,935 Depreciation 24,734,629 167,767,317 26,799,294 141,141,148 78,212,543 67,267,555 38,535,828 376,100,834 49,046,643 19,477,785 Net Plant 68,930,741 302,004,230 90,602,534 406,914,787 109,227,682 128,880,914 67,483,278 786,709,686 144,061,975 51,098,150 Other Assets 43,609,431 87,151,121 40,575,406 174,626,292 42,839,493 99,138,479 19,987,780 394,000,537 11,019,098 11,711,339 Total Assets $112,540,172 $389,155,351 $131,177,940 $581,541,079 $152,067,175 $228,019,393 $87,471,058 $1,180,710,223 $155,081,073 $62,809,489 EQUITY & LIABILITIES Equity $61,304,783 $153,307,365 $59,922,794 $274,845,366 $57,299,760 $108,138,271 $30,973,538 $544,485,013 $51,930,913 $24,908,813 Long-term Debt 28,145,494 $170,943,337 48,870,450 239,492,556 53,572,859 68,363,797 48,075,456 467,348,067 72,483,244 26,516,847 Other Liabilities 23,089,895 64,904,649 22,384,696 67,203,157 41,194,556 51,517,325 8,422,064 168,877,143 30,666,916 11,383,829 Total Equity and Liabilities $112,540,172 $389,155,351 $131,177,940 $581,541,079 $152,067,175 $228,019,393 $87,471,058 $1,180,710,223 $155,081,073 $62,809,489 2019 ASSETS Total Utility Plant (1) $90,200,098 $454,119,666 $117,671,754 $527,752,106 $177,132,480 $184,493,722 $102,010,977 $1,118,033,853 $187,178,494 $68,764,365 Depreciation 23,652,799 156,192,208 27,008,502 135,477,937 74,219,588 64,080,763 36,172,946 353,233,522 48,065,818 18,280,395 Net Plant 66,547,299 297,927,458 90,663,252 392,274,169 102,912,892 120,412,959 65,838,031 764,800,331 139,112,676 50,483,970 Other Assets 40,321,555 81,233,190 36,480,572 187,297,558 37,160,991 93,830,726 20,269,305 364,845,301 10,041,139 10,894,761 Total Assets $106,868,854 $379,160,648 $127,143,824 $579,571,727 $140,073,883 $214,243,685 $86,107,336 $1,129,645,632 $149,153,815 $61,378,731 EQUITY & LIABILITIES Equity $59,441,334 $149,637,695 $55,958,635 $283,628,946 $54,785,360 $94,708,565 $28,546,000 $519,926,477 $51,734,646 $24,044,088 Long-term Debt 28,503,613 $163,816,347 51,194,291 234,346,141 55,430,542 71,316,003 49,499,967 437,714,915 67,499,110 27,347,812 Other Liabilities 18,923,907 65,706,606 19,990,898 61,596,640 29,857,981 48,219,117 8,061,369 172,004,240 29,920,059 9,986,831 Total Equity and Liabilities $106,868,854 $379,160,648 $127,143,824 $579,571,727 $140,073,883 $214,243,685 $86,107,336 $1,129,645,632 $149,153,815 $61,378,731 Footnotes: (1) Including construction work in progress.

Table 6 (Continued) Middle Slash Georgia Mitchell Ocmulgee Oconee Okefenoke Planters Rayle Satilla Sawnee Pine 2021 ASSETS Total Utility Plant (1) $63,783,298 185,640,808 $66,367,916 $85,800,828 $212,313,316 $89,236,765 $113,606,593 $252,484,233 $729,046,717 $50,298,782 Depreciation 16,217,688 39,584,048 24,304,725 26,710,055 73,021,959 25,343,124 37,260,688 55,770,533 133,207,655 10,848,915 Net Plant 47,565,610 146,056,760 42,063,191 59,090,773 139,291,357 63,893,641 76,345,905 196,713,700 595,839,062 39,449,867 Other Assets 13,128,225 41,893,075 16,688,950 23,284,212 39,950,610 42,064,042 21,736,146 72,002,922 285,933,651 19,899,391 Total Assets $60,693,835 $187,949,835 $58,752,141 $82,374,985 $179,241,967 $105,957,683 $98,082,051 $268,716,622 $881,772,713 $59,349,258 EQUITY & LIABILITIES Equity $25,681,857 $90,406,827 $42,168,013 $35,228,785 $66,847,802 $50,452,156 $39,890,214 $120,365,729 $290,418,850 $26,293,796 Long-term Debt 29,403,489 63,300,052 8,660,317 31,075,142 92,916,236 36,040,267 46,138,121 99,484,591 332,440,853 24,574,337 Other Liabilities 5,608,489 34,242,956 7,923,811 16,071,058 19,477,929 19,465,260 12,053,716 48,866,302 258,913,010 8,481,125 Total Equity and Liabilities $60,693,835 $187,949,835 $58,752,141 $82,374,985 $179,241,967 $105,957,683 $98,082,051 $268,716,622 $881,772,713 $59,349,258 2020 ASSETS Total Utility Plant (1) $60,813,881 178,608,729 $64,091,391 $83,488,534 $206,677,684 $86,758,958 $108,932,219 $238,822,302 $699,592,798 $47,402,601 Depreciation 14,860,335 36,124,366 23,040,987 24,943,927 70,114,514 24,179,816 36,341,783 52,539,354 132,589,958 10,716,104 Net Plant 45,953,546 142,484,363 41,050,404 58,544,607 136,563,170 62,579,142 72,590,436 186,282,948 567,002,840 36,686,497 Other Assets 11,939,623 40,073,287 17,179,863 22,887,001 36,386,645 38,304,827 22,923,557 63,351,564 265,529,457 15,476,552 Total Assets $57,893,169 $182,557,650 $58,230,267 $81,431,608 $172,949,815 $100,883,969 $95,513,993 $249,634,512 $832,532,297 $52,163,049 EQUITY & LIABILITIES Equity $25,029,338 $88,440,279 $39,415,544 $33,940,146 $63,460,716 $48,729,156 $37,298,168 $118,730,227 $269,552,162 $24,861,707 Long-term Debt 27,289,601 56,912,500 9,113,782 33,100,027 82,429,785 34,277,086 45,403,795 84,842,195 319,927,545 19,720,923 Other Liabilities 5,574,230 37,204,871 9,700,941 14,391,435 27,059,314 17,877,727 12,812,030 46,062,090 243,052,590 7,580,419 Total Equity and Liabilities $57,893,169 $182,557,650 $58,230,267 $81,431,608 $172,949,815 $100,883,969 $95,513,993 $249,634,512 $832,532,297 $52,163,049 2019 ASSETS Total Utility Plant (1) $58,667,443 167,413,618 $61,781,356 $81,283,181 $198,832,925 $83,679,633 $105,621,993 $230,698,833 $659,661,686 $44,984,285 Depreciation 13,430,185 33,741,901 21,480,834 23,899,214 66,002,762 23,362,635 35,353,137 49,912,479 127,826,612 10,134,414 Net Plant 45,237,258 133,671,717 40,300,522 57,383,967 132,830,163 60,316,998 70,268,856 180,786,354 531,835,074 34,849,871 Other Assets 11,879,343 52,904,200 16,697,932 22,818,317 34,801,283 38,302,132 20,438,906 63,460,836 268,462,635 14,692,625 Total Assets $57,116,601 $186,575,917 $56,998,454 $80,202,284 $167,631,446 $98,619,130 $90,707,762 $244,247,190 $800,297,709 $49,542,496 EQUITY & LIABILITIES Equity $23,918,580 $85,821,533 $36,635,989 $32,641,839 $61,076,149 $46,990,616 $34,624,913 $117,714,798 $272,093,469 $22,853,099 Long-term Debt 26,485,489 55,234,653 9,694,874 35,137,067 85,665,600 36,558,586 44,244,198 90,146,201 301,695,610 19,702,440 Other Liabilities 6,712,532 45,519,731 10,667,591 12,423,378 20,889,697 15,069,928 11,838,651 36,386,191 226,508,630 6,986,957 Total Equity and Liabilities $57,116,601 $186,575,917 $56,998,454 $80,202,284 $167,631,446 $98,619,130 $90,707,762 $244,247,190 $800,297,709 $49,542,496 Footnotes: (1) Including construction work in progress.

Table 6 (Continued) Snapping Southern Three Tri- MEMBER Shoals Rivers Sumter Notch County Upson Walton Washington TOTAL 2021 ASSETS Total Utility Plant (1) $331,579,681 $114,541,647 $142,001,583 $95,284,016 $148,577,527 $32,536,138 $506,594,363 $100,680,327 $10,005,865,694 Depreciation 142,435,632 31,316,095 35,812,629 30,571,811 32,063,729 13,306,492 201,135,009 36,823,381 3,003,282,829 Net Plant 189,144,049 83,225,552 106,188,954 64,712,205 116,513,798 19,229,646 305,459,354 63,856,946 7,002,582,865 Other Assets 108,794,642 46,625,749 40,533,418 29,144,645 18,102,018 18,915,651 221,942,978 33,894,396 2,933,618,704 Total Assets $297,938,691 $129,851,301 $146,722,372 $93,856,850 $134,615,816 $38,145,297 $527,402,332 $97,751,342 $9,936,201,569 EQUITY & LIABILITIES Equity $97,164,114 $46,499,532 $70,982,902 $47,124,930 $44,658,405 $26,009,349 $221,387,486 $47,544,977 $4,296,839,556 Long-term Debt 91,663,182 64,732,812 59,839,283 40,320,152 77,445,465 8,657,065 132,318,295 41,475,552 3,846,943,350 Other Liabilities 109,111,395 18,618,957 15,900,187 6,411,768 12,511,946 3,478,883 173,696,551 8,730,813 1,792,418,663 Total Equity and Liabilities $297,938,691 $129,851,301 $146,722,372 $93,856,850 $134,615,816 $38,145,297 $527,402,332 $97,751,342 $9,936,201,569 2020 ASSETS Total Utility Plant (1) $318,287,714 $105,762,547 $136,401,073 $93,167,777 $136,024,055 $31,295,247 $485,937,949 $94,852,524 $9,523,593,174 Depreciation 135,357,688 30,604,592 33,733,177 30,030,233 29,721,328 12,453,573 191,050,581 34,604,970 2,873,633,542 Net Plant 182,930,026 75,157,955 102,667,896 63,137,544 106,302,727 18,841,674 294,887,368 60,247,554 6,649,959,632 Other Assets 111,876,461 36,521,552 41,066,903 31,398,384 9,399,341 19,392,330 272,351,372 31,038,692 2,957,214,843 Total Assets $294,806,487 $111,679,507 $143,734,799 $94,535,928 $115,702,068 $38,234,004 $567,238,740 $91,286,246 $9,607,174,475 EQUITY & LIABILITIES Equity $98,295,279 $46,723,586 $68,842,206 $46,129,270 $42,199,485 $25,873,313 $203,486,507 $47,430,142 $4,027,778,450 Long-term Debt 86,767,433 49,182,412 58,386,388 42,367,866 65,136,651 8,499,489 138,911,083 37,057,201 3,703,035,427 Other Liabilities 109,743,775 15,773,509 16,506,205 6,038,792 8,365,932 3,861,202 224,841,150 6,798,903 1,876,360,598 Total Equity and Liabilities $294,806,487 $111,679,507 $143,734,799 $94,535,928 $115,702,068 $38,234,004 $567,238,740 $91,286,246 $9,607,174,475 2019 ASSETS Total Utility Plant (1) $306,651,981 $96,672,808 $130,444,700 $87,832,533 $132,122,453 $29,928,431 $467,472,412 $92,035,009 $9,134,961,540 Depreciation 126,773,504 29,665,576 31,719,697 27,748,431 27,951,445 11,714,061 180,207,292 32,346,707 2,721,083,830 Net Plant 179,878,477 67,007,232 98,725,003 60,084,102 104,171,008 18,214,370 287,265,120 59,688,302 6,413,877,710 Other Assets 102,372,303 37,454,876 36,795,099 50,898,745 6,980,422 18,218,005 274,564,181 29,042,950 2,812,724,688 Total Assets $282,250,780 $104,462,108 $135,520,102 $110,982,847 $111,151,430 $36,432,375 $561,829,301 $88,731,252 $9,226,602,398 EQUITY & LIABILITIES Equity $101,620,390 $42,830,794 $66,213,366 $42,099,358 $37,495,589 $24,433,749 $209,820,389 $46,690,818 $3,909,397,649 Long-term Debt 82,023,823 45,894,735 54,273,127 36,586,865 62,633,074 7,936,405 116,061,274 35,215,285 3,576,482,089 Other Liabilities 98,606,567 15,736,579 15,033,609 32,296,624 11,022,767 4,062,221 235,947,638 6,825,149 1,740,722,659 Total Equity and Liabilities $282,250,780 $104,462,108 $135,520,102 $110,982,847 $111,151,430 $36,432,375 $561,829,301 $88,731,252 $9,226,602,398 Footnotes: (1) Including construction work in progress.

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Cover Page	3 Months Ended
	Mar. 31, 2022 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	333-192954
Entity Registrant Name	OGLETHORPE POWER CORP
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1211925
Entity Address, Address Line One	2100 East Exchange Place
Entity Address, City or Town	Tucker
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30084-5336
City Area Code	770
Local Phone Number	270-7600
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Central Index Key	0000788816
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Electric plant:
In service	$ 9,864,049	$ 9,865,660
Right-of-use assets—finance leases	302,732	302,732
Less: Accumulated provision for depreciation	(5,682,179)	(5,565,724)
Net in service	4,484,602	4,602,668
Nuclear fuel, at amortized cost	383,403	375,267
Construction work in progress	6,981,823	6,779,392
Total electric plant	11,849,828	11,757,327
Investments and funds:
Nuclear decommissioning trust fund	615,247	659,910
Investment in associated companies	76,389	75,826
Long-term investments	702,821	711,379
Restricted investments	0	73,702
Other	32,432	31,991
Total investments and funds	1,426,889	1,552,808
Current assets:
Cash and cash equivalents	467,353	579,350
Restricted cash and short-term investments	236,015	248,150
Receivables	160,085	159,538
Inventories, at average cost	261,294	260,526
Prepayments and other current assets	105,234	60,486
Total current assets	1,229,981	1,308,050
Deferred charges and other assets:
Regulatory assets	1,088,130	1,008,790
Prepayments to Georgia Power Company	30,062	27,124
Other	112,179	52,927
Total deferred charges	1,230,371	1,088,841
Total assets	15,737,069	15,707,026
Capitalization:
Patronage capital and membership fees	1,152,403	1,130,423
Long-term debt	10,945,787	10,529,449
Obligation under finance leases	61,335	61,335
Other	27,893	27,701
Total capitalization	12,187,418	11,748,908
Current liabilities:
Long-term debt and finance leases due within one year	346,516	281,238
Short-term borrowings	663,067	1,095,971
Accounts payable	63,488	182,164
Accrued interest	77,748	96,410
Member power bill prepayments, current	26,754	26,102
Other current liabilities	80,240	36,123
Total current liabilities	1,257,813	1,718,008
Deferred credits and other liabilities:
Asset retirement obligations	1,299,183	1,287,143
Member power bill prepayments, non-current	71,361	80,001
Regulatory liabilities	898,095	849,449
Other	23,199	23,517
Total deferred credits and other liabilities	2,291,838	2,240,110
Total equity and liabilities	$ 15,737,069	$ 15,707,026

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Consolidated Statements of Revenues and Expenses (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating revenues:
Total operating revenues	$ 420,442	$ 376,331
Operating expenses:
Fuel	165,484	108,065
Production	95,780	105,373
Depreciation and amortization	70,926	67,619
Purchased power	16,875	16,920
Accretion	13,532	13,781
Total operating expenses	362,597	311,758
Operating margin	57,845	64,573
Other income:
Investment income	11,847	11,960
Other	3,030	2,171
Total other income	14,877	14,131
Interest charges:
Interest expense	104,669	103,479
Allowance for debt funds used during construction	(56,773)	(53,639)
Amortization of debt discount and expense	2,846	2,906
Net interest charges	50,742	52,746
Net margin	21,980	25,958
Members
Operating revenues:
Total operating revenues	417,449	376,272
Non-Members
Operating revenues:
Total operating revenues	$ 2,993	$ 59

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Consolidated Statements of Patronage Capital and Membership Fees (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Members' Capital
Net margin	$ 21,980	$ 25,958
Patronage Capital and Membership Fees
Increase (Decrease) in Members' Capital
Beginning balance	1,130,423	1,072,642
Net margin	21,980	25,958
Ending balance	$ 1,152,403	$ 1,098,600

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net margin	$ 21,980	$ 25,958
Adjustments to reconcile net margin to net cash provided by operating activities:
Depreciation and amortization, including nuclear fuel	92,211	99,638
Accretion cost	13,532	13,781
Amortization of deferred gains	(447)	(447)
Allowance for equity funds used during construction	(135)	(26)
Deferred outage costs	(22,228)	(13,231)
Loss (gain) on sale of investments	8,271	(9,134)
Regulatory deferral of costs associated with nuclear decommissioning	(14,694)	284
Other	974	(641)
Change in operating assets and liabilities:
Receivables	(8,620)	1,455
Inventories	(715)	8,567
Prepayments and other current assets	5,954	4,039
Accounts payable	(78,836)	(41,415)
Accrued interest	(18,662)	4,300
Accrued taxes	16,180	(22,542)
Other current liabilities	29,836	(6,273)
Member power bill prepayments	(7,988)	(18,779)
Rate management program collections	11,017	37,979
Total adjustments	25,650	57,555
Net cash provided by operating activities	47,630	83,513
Cash flows from investing activities:
Property additions	(280,364)	(324,181)
Activity in nuclear decommissioning trust fund—Purchases	(195,038)	(250,195)
Activity in nuclear decommissioning trust fund - Proceeds	192,858	248,147
Decrease in restricted cash and investments	123,232	54,280
Activity in other long-term investments—Purchases	(111,490)	(120,752)
Activity in other long-term investments - Proceeds	94,279	72,293
Other	(3,718)	144
Net cash used in investing activities	(180,241)	(320,264)
Cash flows from financing activities:
Long-term debt proceeds	102,185	238,578
Long-term debt payments	(115,168)	(61,828)
Increase in short-term borrowings, net	60,501	217,674
Other	10,496	(2,083)
Net cash provided by financing activities	58,014	392,341
Net (decrease) increase in cash, cash equivalents and restricted cash	(74,597)	155,590
Cash, cash equivalents and restricted cash at beginning of period	581,150	405,511
Cash, cash equivalents and restricted cash at end of period	506,553	561,101
Cash paid for—
Interest (net of amounts capitalized)	66,117	45,127
Supplemental disclosure of non-cash investing and financing activities:
Change in asset retirement obligations	0	(399)
Accrued property additions at end of period	$ 21,469	$ 76,364

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General	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General.    The consolidated financial statements included in this report have been prepared by us pursuant to the rules and regulations of the Securities and Exchange Commission. In the opinion of management, the information furnished in this report reflects all adjustments (which include only normal recurring adjustments) and estimates necessary to fairly state, in all material respects, our financial condition and results of operations for the three-month periods ended March 31, 2022 and 2021. Examples of estimates used include items related to (i) our asset retirement obligations, such as closure and post-closure cost estimates, timing of expenditures, escalation factors and discount rates, and (ii) revenue recognition, such as determining the nature and timing of satisfaction of performance obligations, determining the standalone selling price of performance obligations and variable consideration. Actual results may differ from those estimates. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to SEC rules and regulations, although we believe that the disclosures are adequate to make the information presented not misleading. Certain prior year amounts have been reclassified to conform with current year presentation.These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, as filed with the SEC. The results of operations for the three-month period ended March 31, 2022 are not necessarily indicative of results to be expected for the full year. As noted in our 2021 Form 10-K, our revenues consist primarily of sales to our 38 electric distribution cooperative members and, thus, the receivables on the consolidated balance sheets are principally from our members. See "Notes to Consolidated Financial Statements" in our 2021 Form 10-K.

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Fair Value

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value

Fair Value.    Authoritative guidance regarding fair value measurements for financial and non-financial assets and liabilities defines fair value, establishes a framework for measuring fair value in accordance with generally accepted accounting principles, and expands disclosures about fair value measurements.

The guidance establishes a three-tier fair value hierarchy which prioritizes the inputs used in measuring fair value as follows:

•Level 1.  Quoted prices from active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Quoted prices in active markets provide the most reliable evidence of fair value and are used to measure fair value whenever available. Level 1 primarily consists of financial instruments that are exchange-traded.

•Level 2.  Pricing inputs other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date. Level 2 includes 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. Level 2 primarily consists of financial instruments that are non-exchange-traded but have significant observable inputs.

•Level 3.  Pricing inputs that include significant inputs which are generally less observable from objective sources. These inputs may include internally developed methodologies that result in management's best estimate of fair value. Level 3 financial instruments are those whose fair value is based on significant unobservable inputs.

As required by the guidance, assets and liabilities measured at fair value are based on one or more of the following three valuation techniques:

1.Market approach.    The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities (including a business) and deriving fair value based on these inputs.

2.Income approach.    The income approach uses valuation techniques to convert future amounts (for example, cash flows or earnings) to a single present amount (discounted). The measurement is based on the value indicated by current market expectations about those future amounts.

3.Cost approach.    The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (often referred to as current replacement cost). This approach assumes that the fair value would not exceed what it would cost a market participant to acquire or construct a substitute asset of comparable utility, adjusted for obsolescence.

The tables below detail assets and liabilities measured at fair value on a recurring basis at March 31, 2022 and December 31, 2021.

	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	March 31, 2022		(Level 1)		(Level 2)		(Level 3)
	(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity	$	237,403	$	237,403	$	—	$	—
International equity trust	126,621		—		126,621		—
Corporate bonds and debt	47,987		—		46,718		1,269
US Treasury securities	102,406		102,406		—		—
Mortgage backed securities	22,192		—		22,192		—
Domestic mutual funds	68,348		68,348		—		—
Municipal bonds	809		—		809		—
Federal agency securities	2,268		—		2,268		—
Other	7,213		7,213		—		—
Long-term investments:
International equity trust	36,959		—		36,959		—
Corporate bonds and debt	4,129		—		2,938		1,191
US Treasury securities	40,382		40,382		—		—
Mortgage backed securities	—		—		—		—
Domestic mutual funds	271,155		271,155		—		—
Federal agency securities	—		—		—		—
Treasury STRIPS	350,275		—		350,275		—
Other	(79)		(79)		—		—
Natural gas swaps	173,946		—		173,946		—

	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	December 31, 2021		(Level 1)		(Level 2)		(Level 3)
	(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity	$	249,999	$	249,999	$	—	$	—
International equity trust	140,718		—		140,718		—
Corporate bonds and debt	72,936		—		72,369		567
US Treasury securities	53,321		53,321		—		—
Mortgage backed securities	40,460		—		40,460		—
Domestic mutual funds	75,384		75,384		—		—
Municipal bonds	1,133		—		1,133		—
Federal agency securities	9,608		—		9,608		—
Other	16,351		13,623		2,728		—
Long-term investments:
International equity trust	35,873		—		35,873		—
Corporate bonds and debt	14,022		—		12,656		1,366
US Treasury securities	15,259		15,259		—		—
Mortgage backed securities	12,021		—		12,021		—
Domestic mutual funds	277,937		277,937		—		—
Federal agency securities	257		—		257		—
Treasury STRIPS	350,532		—		350,532		—
Other	5,478		5,478		—		—
Natural gas swaps	63,994		—		63,994		—

The Level 2 investments above in corporate bonds and debt, federal agency securities, and mortgage backed securities may not be exchange traded. The fair value measurements for these investments are based on a market approach, including the use of observable inputs at or near the valuation date. Common inputs include reported trades and broker/dealer bid/ask prices. The fair value of the Level 2 investments above in international equity trust are calculated based on the net asset value per share of the fund. There are no unfunded commitments for the international equity trust and redemption may occur daily with a 3-day redemption notice period.

The Level 3 investments above in corporate bonds and debt consist of investments in bank loans which are not exchange traded. Although these securities may be liquid and priced daily, their inputs are not observable.

The estimated fair values of our long-term debt, including current maturities at March 31, 2022 and December 31, 2021 were as follows:

	2022				2021
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Long-term debt	$	10,830,072	$	11,338,418	$	10,915,054	$	12,741,046

The estimated fair value of long-term debt is classified as Level 2 and is estimated based on observed or quoted market prices for the same or similar issues or on current rates offered to us for debt of similar maturities. The primary sources of our long-term debt consist of first mortgage bonds, pollution control revenue bonds and long-term debt issued by the Federal Financing Bank that is guaranteed by the Rural Utilities Service or the U.S. Department of Energy. The valuations for the first mortgage bonds and the pollution control revenue bonds were obtained from a third party data reporting service, and are based on secondary market trading of our debt. Valuations for debt issued by the Federal

Financing Bank are based on U.S. Treasury rates as of March 31, 2022 and December 31, 2021 plus an applicable spread, which reflects our borrowing rate for new loans of this type from the Federal Financing Bank.

For cash and cash equivalents, and receivables, the carrying amount approximates fair value because of the short-term maturity of those instruments. Restricted investments consist of funds on deposit with the Rural Utilities Service in the Cushion of Credit Account and the carrying amount of these investments approximates fair value because of the liquid nature of the deposits with the U.S. Treasury.

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Derivative Instruments

3 Months Ended

Mar. 31, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments.    We use commodity derivatives to manage our exposure to fluctuations in the market price of natural gas. Our risk management and compliance committee provides general oversight over all derivative activities. We do not apply hedge accounting to derivative transactions, but instead apply regulated operations accounting. Consistent with our rate-making, unrealized gains or losses on our natural gas swaps are reflected as regulatory assets or liabilities, as appropriate. Realized gains and losses on natural gas swaps are included in fuel expense within our consolidated statements of revenues and expenses and, therefore, net margins within our consolidated statement of cash flows.

We are exposed to credit risk as a result of entering into these arrangements. Credit risk is the potential loss resulting from a counterparty's nonperformance under an agreement. We have established policies and procedures to manage credit risk through counterparty analysis, exposure calculation and monitoring, exposure limits, collateralization and certain other contractual provisions.

It is possible that volatility in commodity prices could cause us to have credit risk exposures with one or more counterparties. If such counterparties fail to perform their obligations, we could suffer a financial loss. However, as of March 31, 2022, all of the counterparties with transaction amounts outstanding under our derivative programs are rated investment grade by the major rating agencies or have provided a guaranty from one of their affiliates that is rated investment grade.

We have entered into International Swaps and Derivatives Association agreements with our natural gas derivative counterparties that mitigate credit exposure by creating contractual rights relating to creditworthiness, collateral, termination and netting (which, in certain cases, allows us to use the net value of affected transactions with the same counterparty in the event of default by the counterparty or early termination of the agreement).

Additionally, we have implemented procedures to monitor the creditworthiness of our counterparties and to evaluate nonperformance in valuing counterparty positions. We have contracted with a third party to assist in monitoring certain of our counterparties' credit standing and condition. Net liability positions are generally not adjusted as we use derivative transactions as hedges and have the ability and intent to perform under each of our contracts. In the instance of net asset positions, we consider general market conditions and the observable financial health and outlook of specific counterparties, forward looking data such as credit default swaps, when available, and historical default probabilities from credit rating agencies in evaluating the potential impact of nonperformance risk to derivative positions.

The contractual agreements contain provisions that could require us or the counterparty to post collateral or credit support. The amount of collateral or credit support that could be required is calculated as the difference between the aggregate fair value of the hedges and pre-established credit thresholds. The credit thresholds are contingent upon each party's credit ratings from the major credit rating agencies. The collateral and credit support requirements vary by contract and by counterparty.

Under the natural gas swap arrangements, we pay the counterparty a fixed price for specified natural gas quantities and receive a payment for such quantities based on a market price index. These payment obligations are netted, such that if the market price index is lower than the fixed price, we will make a net payment, and if the market price index is higher than the fixed price, we will receive a net payment.

At March 31, 2022 and December 31, 2021, the estimated fair values of our natural gas contracts were net assets of approximately $173,946,000 and $63,994,000, respectively.

As of March 31, 2022, four of our counterparties were required to post credit collateral totaling $39,200,000 under our natural gas swap agreements. As of December 31, 2021, one of our counterparties was required to post credit collateral totaling $1,800,000 under our natural gas swap agreements. Such collateral is classified as restricted cash and included in the Restricted cash and investments line items within our unaudited consolidated balance sheets.

The following table reflects the notional volume of our natural gas derivatives as of March 31, 2022 that is expected to settle or mature each year:

Year	Natural Gas Swaps (MMBTUs)  (in millions)
2022	21.6
2023	26.8
2024	25.3
2025	21.2
2026	16.0
2027	0.9
Total	111.8

The table below reflects the fair value of derivative instruments and their effect on our consolidated balance sheets at March 31, 2022 and December 31, 2021.

	Balance Sheet Location	Fair Value
		2022		2021
		(dollars in thousands)
Assets:
Natural gas swaps	Other current assets	$	74,299	$	23,596
Natural gas swaps	Other deferred charges	$	99,647	$	40,398
Liabilities:
Natural gas swaps	Other current liabilities	$	—	$	—
Natural gas swaps	Other deferred credits	$	—	$	—

The following table presents the gross realized gains and (losses) on derivative instruments recognized in net margins for the three months ended March 31, 2022 and 2021.

	Statement of Revenues and Expenses Location	Three Months Ended March 31,
		2022		2021
		(dollars in thousands)
Natural gas swaps gains	Fuel	$	8,078	$	101
Natural gas swaps losses	Fuel	(79)		(1,244)
Total		$	7,999	$	(1,143)

The following table presents the unrealized gains on derivative instruments deferred on the balance sheet at March 31, 2022 and December 31, 2021.

	Balance Sheet Location	2022		2021
		(dollars in thousands)
Natural gas swaps	Regulatory liability	$	173,946	$	63,994
Total		$	173,946	$	63,994

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Investments Securities

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities.    Investment securities we hold are recorded at fair value in the accompanying consolidated balance sheets. We apply regulated operations accounting to the unrealized gains and losses of all investment securities. All realized and unrealized gains and losses are determined using the specific identification method.

The following tables summarize debt and equity securities as of March 31, 2022 and December 31, 2021.

	Gross Unrealized
	(dollars in thousands)
March 31, 2022	Cost		Gains		Losses		Fair Value
Equity	$	310,055	$	236,875	$	(4,239)	$	542,691
Debt	792,554		446		(24,757)		768,243
Other	7,134		—		—		7,134
Total	$	1,109,743	$	237,321	$	(28,996)	$	1,318,068

	Gross Unrealized
	(dollars in thousands)
December 31, 2021	Cost		Gains		Losses		Fair Value
Equity	$	304,305	$	280,127	$	(4,682)	$	579,750
Debt	774,580		4,859		(7,001)		772,438
Other	19,102		—		(1)		19,101
Total	$	1,097,987	$	284,986	$	(11,684)	$	1,371,289

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Recently Issued or Adopted Accounting Pronouncements

3 Months Ended

Mar. 31, 2022

Accounting Standards Update and Change in Accounting Principle [Abstract]

Recently Issued or Adopted Accounting Pronouncements

Recently Issued or Adopted Accounting Pronouncements.   In March 2020, the Financial Accounting Standards Board (FASB) issued “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting”. The amendments in this update apply to all entities that have contracts, hedging relationships, and other transactions that reference London Interbank Offered Rate (LIBOR) or another reference rate expected to be discontinued because of reference rate reform. The amendments in this update provide optional expedients and exceptions for applying U.S. GAAP to transactions affected by reference rate reform if certain criteria are met. The expedients and exceptions provided by the amendments in this update do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship.

In January 2021, the FASB issued “Reference Rate Reform (Topic 848): Scope,” to further clarify the scope of the reference rate reform guidance in Topic 848. The amendments in this update refine the scope of Topic 848 to clarify that certain optional expedients and exceptions therein for contract modifications and hedge accounting apply to contracts that are affected by the discounting transition. Specifically, modifications related to reference rate reform would not be considered an event that requires reassessment of previous accounting conclusions. The amendments in this update also amend the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition.

The amendments in these updates are effective for all entities as of March 12, 2020 through December 31, 2022. We have fully completed our evaluation of this new standard and we do not expect this standard will have a material impact on our consolidated financial statements.

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Revenue Recognition

3 Months Ended

Mar. 31, 2022

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenue Recognition.    As an electric membership cooperative, our principal business is providing wholesale electric service to our members. Our operating revenues are derived primarily from wholesale power contracts we have with each of our 38 members. These contracts, which extend to December 31, 2050, are substantially identical and obligate our members jointly and severally to pay all expenses associated with owning and operating our power supply business. As a cooperative, we operate on a not-for-profit basis and, accordingly, seek only to generate revenues sufficient to recover our cost of service and to generate margins sufficient to establish reasonable reserves and meet certain financial coverage requirements. We also have short-term energy sales to non-members made through industry standard contracts. We do not have multiple operating segments.Pursuant to our contracts, we primarily provide two services, capacity and energy. Capacity and energy revenues are recognized by us upon transfer of control of promised services to our members and non-members in an amount that reflects the consideration we expect to receive in exchange for those services. Capacity and energy are distinct and we account for them as separate performance obligations. The obligations to provide capacity and energy are satisfied over time as the customer simultaneously receives and consumes the benefit of these services. Both performance obligations are provided directly by us and not through a third party.

Each of our members is obligated to pay us for capacity and energy we furnish under the wholesale power contract in accordance with rates we establish. We review our rates periodically but are required to do so at least once every year. Revenues from our members are derived through a cost-plus rate structure which is set forth as a formula in the rate schedule to the wholesale power contracts. The formulary rate provides for the pass-through of our (i) fixed costs (net of any income from other sources) plus a targeted margin as capacity revenues and (ii) variable costs as energy revenues from our members. Power purchase and sale agreements between us and non-members obligate each non-member to pay us for capacity, if any, and energy furnished in accordance with the prices mutually agreed upon. Margins produced from non-member sales are included in our rate schedule formula and reduce revenue requirements from our members. As of March 31, 2022 and December 31, 2021, we did not have any long-term contracts with non-members.

The consideration we receive for providing capacity services is determined by our formulary rate on an annual basis. The components of the formulary rate associated with capacity costs include the annual budget of fixed costs, a targeted margin and income from other sources. Capacity revenues, therefore, vary to the extent these components vary. Fixed costs include items such as fixed operation and maintenance expenses, administrative and general expenses, depreciation and interest. Year to year, capacity revenue fluctuations are generally due to the recovery of fixed operation and maintenance expenses. Fixed costs also include certain costs, such as major maintenance costs, which will be recognized as expense in future periods. Recognition of revenues associated with these future expenses is deferred pursuant to Accounting Standards Codification (ASC) 980, Regulated Operations. The regulatory liabilities are amortized to revenue in accordance with the associated revenue deferral plan as the expenses are recognized. For information regarding regulatory accounting, see Note J.

Capacity revenues are recognized by us for standing ready to deliver electricity to our customers. Our capacity revenues are based on the associated costs we expect to recover in a given year and are generally recognized and billed to our members in equal monthly installments over the course of the year regardless of whether our generation and purchased power resources are dispatched to produce electricity. Non-member capacity revenues, if any, are typically billed and recognized in equal monthly installments over the term of the contract.

We have a power bill prepayment program pursuant to which our members may prepay future capacity costs and receive a discount. As this program provides us with financing, we adjust our capacity revenues by the amount of the discount, which is based on our avoided cost of borrowing. For additional information regarding our member prepayment program, see Note K.

We satisfy our performance obligations to deliver energy as energy is delivered to the applicable meter points. We determine the standard selling price for energy we deliver to our members based upon the variable costs incurred to generate or purchase that energy. Fuel expense is the primary variable cost. Energy revenue recognized equals the actual variable expenses incurred in any given accounting period. Our member energy revenues fluctuate from period to period based on several factors, including fuel costs, weather and other seasonal factors, load requirements in our members' service territories, variable operating costs, the availability of electric generation resources, our decisions of whether to dispatch our owned or purchased resources or member-owned resources over which we have dispatch rights, and by members' decisions of whether to purchase a portion of their hourly energy requirements from our resources or from other suppliers. For the three-month periods ended March 31, 2022 and 2021, we provided approximately 57% and 55% of our members' energy requirements, respectively. The standard selling price for our energy revenues from non-members is the price mutually agreed upon.

We are required under our first mortgage indenture to produce a margins for interest ratio of at least 1.10 for each fiscal year. For 2022, our board has approved a targeted margins for interest ratio of 1.14. Historically, our board of directors has approved adjustments to revenue requirements by year end such that revenue in excess of that required to meet the targeted margins for interest ratio is refunded to the members. Given that our capacity revenues are based upon budgeted expenditures and generally recognized and billed to our members in equal monthly installments over the course of the year, we may recognize capacity revenues that exceed our actual fixed costs and targeted margins in any given interim reporting period. At each interim reporting period we assess our projected revenue requirements through year end to determine whether a refund to our members of excess consideration is likely. If so, we reduce our capacity revenues and recognize a refund liability to our members. Refund liabilities, if any, are included in accounts payable on our consolidated balance sheets. As of March 31, 2022 and March 31, 2021, we did not recognize a refund liability for either period. Based on our current agreements with non-members, we do not refund any consideration received from non-members.

Sales to members for the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022			2021
Capacity revenues	$	243,291		$	255,824
Energy revenues	174,158			120,448
Total	$	417,449		$	376,272
Member energy requirements supplied	57		%	55		%

Receivables from contracts with our members at March 31, 2022 and December 31, 2021 were $137,121,000 and $143,715,000, respectively.

Sales to non-members during the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022		2021
Energy revenues	$	2,993	$	59

Receivables from non-member energy sales at March 31, 2022 and December 31, 2021 were $2,095,000 and $302,000, respectively.

Energy revenues from non-members for the three months ended March 31, 2022 were primarily from the sale of a portion of the energy output at Effingham, which we acquired in July 2021, into the wholesale market. For additional information regarding the Effingham acquisition, see Note 13 in our 2021 Form 10-K. There were no capacity revenues to non-members for the three months ended March 31, 2022 and 2021.

Electric capacity and energy revenues are recognized by us without any obligation for returns, warranties or taxes collected. As our members are jointly and severally obligated to pay all expenses associated with owning and operating our power supply business and we perform an on-going assessment of the credit worthiness of non-members and have not had a history of any write-offs from non-members, we have not recorded an allowance for doubtful accounts associated with our receivables from members or non-members.

We have a rate management program that allows us to expense and recover interest costs associated with the construction of Vogtle Units No. 3 and No. 4, on a current basis, that would otherwise be deferred or capitalized. The subscribing members of Vogtle Units No. 3 and No. 4 can elect to participate in this program on an annual basis. Under this program, amounts billed to participating members during the three months ended March 31, 2022 and 2021 were $3,861,000 and $3,857,000, respectively. The cumulative amount billed since inception of the program totaled $115,497,000.

In 2018, we began an additional rate management program that allows us to recover future expense on a current basis from our members. In general, the program allows for additional collections over a five-year period with those amounts then applied to billings over the subsequent five-year period. The program is designed primarily as a mechanism to assist our members in managing the rate impacts associated with the commercial operation of the new Vogtle units. During the first quarter of 2022, we began applying billing credits to some of our participating members within this program. Under this program, amounts billed to participating members, net of billing credits, during the three months ended March 31, 2022, and 2021 were $2,944,000 and $40,044,000, respectively. Funds collected through this program are invested and held until applied to members' bills. In conjunction with this program, we are applying regulated operations accounting to defer these revenues and related investment income on the funds collected. Amounts deferred under the program will be amortized to income when applied to members' bills. The net cumulative amount billed, since inception of the program totaled $360,272,000.

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Leases

3 Months Ended

Mar. 31, 2022

Leases [Abstract]

Leases

Leases.    As a lessee, we have a relatively small portfolio of leases with the most significant being our 60% undivided interest in Scherer Unit No. 2 and railcar leases for the transportation of coal. We also have various other leases of minimal value.

We classify our four Scherer Unit No. 2 leases as finance leases and our railcar leases as operating leases. We have made an accounting policy election not to recognize right-of-use assets and lease liabilities that arise from short-term leases, leases having an initial term of 12 months or less, for any class of underlying asset. We recognize lease expense for short-term leases on a straight-line basis over the lease term. Lease expense recognized for our short-term leases during the three months ended March 31, 2022 and 2021 was insignificant.

Finance Leases

Three of our Scherer Unit No. 2 finance leases have lease terms through December 31, 2027, and one lease extends through June 30, 2031. At the end of the leases, we can elect at our sole discretion to:

•Renew the leases for a period of not less than one year and not more than five years at fair market value,

•Purchase the undivided interest at fair market value, or

•Redeliver the undivided interest to the lessors.

For rate-making purposes, we include the actual lease payments for our finance leases in our cost of service. The difference between lease payments and the aggregate of the amortization on the right-of-use asset and the interest on the finance lease obligation is recognized as a regulatory asset. Finance lease amortization is recorded in depreciation and amortization expense.

Operating Leases

Our railcar operating leases have terms that extend through March 16, 2024. At the end of the railcar operating leases, we can renew at terms mutually agreeable by us and the lessors, purchase the assets or return the assets to the lessors. We have an additional operating lease that has a term that extends through February 2042 with one renewal option for a 20 year term.

The exercise of renewal options for our finance and operating leases is at our sole discretion.

As all of our operating leases do not provide an implicit rate, we use an incremental borrowing rate based on the information available at the time new lease agreements are entered into or reassessed to determine the present value of lease payments.

For lease agreements entered into or reassessed after the adoption of the new leases standard, we combine lease and nonlease components.

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Finance leases
Right-of-use assets	$	302,732	$	302,732
Less: Accumulated provision for depreciation	(268,923)		(267,606)
Total finance lease assets	$	33,809	$	35,126
Lease liabilities—Finance leases
Obligations under finance leases	$	61,335	$	61,335
Long-term debt and finance leases due within one year	7,541		7,541
Total finance lease liabilities	$	68,876	$	68,876

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Operating leases
Electric plant in service, net	$	2,086	$	2,293
Total operating lease assets	$	2,086	$	2,293
Lease liabilities—Operating leases
Capitalization—Other	$	1,301	$	1,550
Other current liabilities	798		838
Total operating lease liabilities	$	2,099	$	2,388

		Three months ended
Lease Cost	Classification	March 31, 2022		March 31, 2021
		(dollars in thousands)
Finance lease cost:
Amortization of leased assets	Depreciation and amortization	$	1,885	$	1,516
Interest on lease liabilities	Interest expense	1,852		2,044
Operating lease cost:	Inventory(1) & production expense	222		270
Total leased cost		$	3,959	$	3,830

(1) The majority of our operating lease costs relate to our railcar leases and such costs are added to the cost of our fossil-fuel inventories and are recognized in fuel expense as the inventories are consumed.

	March 31, 2022		December 31, 2021
Lease Term and Discount Rate:
Weighted-average remaining lease term (in years)
Finance leases	6.65		6.90
Operating leases	8.60		8.01
Weighted-average discount rate:
Finance leases	11.05	%	11.05	%
Operating leases	4.84	%	4.73	%

	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Other Information:
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	303	$	351
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	—

Maturity analysis of our finance and operating lease liabilities as of March 31, 2022 is as follows:

	(dollars in thousands)
Year Ending December 31,	Finance Leases		Operating Leases		Total
2022	$	14,949	$	626	$	15,575
2023	14,949		708		15,657
2024	14,949		234		15,183
2025	14,949		72		15,021
2026	14,949		72		15,021
Thereafter	25,633		940		26,573
Total lease payments	$	100,378	$	2,652	$	103,030
Less: imputed interest	(31,502)		(553)		(32,055)
Present value of lease liabilities	$	68,876	$	2,099	$	70,975

As a lessor, we primarily lease office space to several tenants within our headquarters building. Several of these tenants are related parties. We account for all of these lease agreements as operating leases.

Lease income recognized during the three months ended March 31, 2022 and 2021 was as follows:

	Three Months Ended March 31,
	2022		2021
	(dollars in thousands)
Lease income	$	1,645	$	1,597

Leases

Leases.    As a lessee, we have a relatively small portfolio of leases with the most significant being our 60% undivided interest in Scherer Unit No. 2 and railcar leases for the transportation of coal. We also have various other leases of minimal value.

We classify our four Scherer Unit No. 2 leases as finance leases and our railcar leases as operating leases. We have made an accounting policy election not to recognize right-of-use assets and lease liabilities that arise from short-term leases, leases having an initial term of 12 months or less, for any class of underlying asset. We recognize lease expense for short-term leases on a straight-line basis over the lease term. Lease expense recognized for our short-term leases during the three months ended March 31, 2022 and 2021 was insignificant.

Finance Leases

Three of our Scherer Unit No. 2 finance leases have lease terms through December 31, 2027, and one lease extends through June 30, 2031. At the end of the leases, we can elect at our sole discretion to:

•Renew the leases for a period of not less than one year and not more than five years at fair market value,

•Purchase the undivided interest at fair market value, or

•Redeliver the undivided interest to the lessors.

For rate-making purposes, we include the actual lease payments for our finance leases in our cost of service. The difference between lease payments and the aggregate of the amortization on the right-of-use asset and the interest on the finance lease obligation is recognized as a regulatory asset. Finance lease amortization is recorded in depreciation and amortization expense.

Operating Leases

Our railcar operating leases have terms that extend through March 16, 2024. At the end of the railcar operating leases, we can renew at terms mutually agreeable by us and the lessors, purchase the assets or return the assets to the lessors. We have an additional operating lease that has a term that extends through February 2042 with one renewal option for a 20 year term.

The exercise of renewal options for our finance and operating leases is at our sole discretion.

As all of our operating leases do not provide an implicit rate, we use an incremental borrowing rate based on the information available at the time new lease agreements are entered into or reassessed to determine the present value of lease payments.

For lease agreements entered into or reassessed after the adoption of the new leases standard, we combine lease and nonlease components.

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Finance leases
Right-of-use assets	$	302,732	$	302,732
Less: Accumulated provision for depreciation	(268,923)		(267,606)
Total finance lease assets	$	33,809	$	35,126
Lease liabilities—Finance leases
Obligations under finance leases	$	61,335	$	61,335
Long-term debt and finance leases due within one year	7,541		7,541
Total finance lease liabilities	$	68,876	$	68,876

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Operating leases
Electric plant in service, net	$	2,086	$	2,293
Total operating lease assets	$	2,086	$	2,293
Lease liabilities—Operating leases
Capitalization—Other	$	1,301	$	1,550
Other current liabilities	798		838
Total operating lease liabilities	$	2,099	$	2,388

		Three months ended
Lease Cost	Classification	March 31, 2022		March 31, 2021
		(dollars in thousands)
Finance lease cost:
Amortization of leased assets	Depreciation and amortization	$	1,885	$	1,516
Interest on lease liabilities	Interest expense	1,852		2,044
Operating lease cost:	Inventory(1) & production expense	222		270
Total leased cost		$	3,959	$	3,830

(1) The majority of our operating lease costs relate to our railcar leases and such costs are added to the cost of our fossil-fuel inventories and are recognized in fuel expense as the inventories are consumed.

	March 31, 2022		December 31, 2021
Lease Term and Discount Rate:
Weighted-average remaining lease term (in years)
Finance leases	6.65		6.90
Operating leases	8.60		8.01
Weighted-average discount rate:
Finance leases	11.05	%	11.05	%
Operating leases	4.84	%	4.73	%

	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Other Information:
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	303	$	351
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	—

Maturity analysis of our finance and operating lease liabilities as of March 31, 2022 is as follows:

	(dollars in thousands)
Year Ending December 31,	Finance Leases		Operating Leases		Total
2022	$	14,949	$	626	$	15,575
2023	14,949		708		15,657
2024	14,949		234		15,183
2025	14,949		72		15,021
2026	14,949		72		15,021
Thereafter	25,633		940		26,573
Total lease payments	$	100,378	$	2,652	$	103,030
Less: imputed interest	(31,502)		(553)		(32,055)
Present value of lease liabilities	$	68,876	$	2,099	$	70,975

As a lessor, we primarily lease office space to several tenants within our headquarters building. Several of these tenants are related parties. We account for all of these lease agreements as operating leases.

Lease income recognized during the three months ended March 31, 2022 and 2021 was as follows:

	Three Months Ended March 31,
	2022		2021
	(dollars in thousands)
Lease income	$	1,645	$	1,597

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Contingencies and Regulatory Matters

3 Months Ended

Mar. 31, 2022

Contingencies and Regulatory Matters

Contingencies and Regulatory Matters

Contingencies and Regulatory Matters.    We do not anticipate that the liabilities, if any, for any current proceedings against us will have a material effect on our financial condition or results of operations. However, at this time, the ultimate outcome of any pending or potential litigation cannot be determined.

Environmental Matters.    As is typical for electric utilities, we are subject to various federal, state and local environmental laws which represent significant future risks and uncertainties. Air emissions, water discharges and water usage are extensively controlled, closely monitored and periodically reported. Handling and disposal requirements govern the manner of transportation, storage and disposal of various types of waste. We may also become subject to climate change regulations that impose restrictions on emissions of greenhouse gases, including carbon dioxide.

Such requirements may substantially increase the cost of electric service, by requiring modifications in the design or operation of existing facilities or the purchase of emission allowances. Failure to comply with these requirements could result in civil and criminal penalties and could include the complete shutdown of individual generating units not in compliance. Certain of our debt instruments require us to comply in all material respects with laws, rules, regulations and orders imposed by applicable governmental authorities, which include current and future environmental laws or regulations. Should we fail to be in compliance with these requirements, it would constitute a default under those debt instruments. We believe that we are in compliance with those environmental regulations currently applicable to our business and operations. Although it is our intent to comply with current and future regulations, we cannot provide assurance that we will always be in compliance.

At this time, the ultimate impact of any potential new and more stringent environmental regulations described above is uncertain and could have an effect on our financial condition, results of operations and cash flows as a result of future additional capital expenditures and increased operations and maintenance costs.

Additionally, litigation over environmental issues and claims of various types, including property damage, personal injury, common law nuisance, and citizen enforcement of environmental requirements such as air quality and water standards, has increased generally throughout the United States. In particular, personal injury and other claims for damages caused by alleged exposure to hazardous materials, and common law nuisance claims for injunctive relief, personal injury and property damage allegedly caused by coal combustion residue, greenhouse gas and other emissions have become more frequent.

In July 2020, a group of individual plaintiffs filed a complaint in the Superior Court of Fulton County, Georgia against Georgia Power alleging that releases from Plant Scherer, of which we are a co-owner, have impacted groundwater, surface water, and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. Georgia

Power has filed multiple motions to dismiss the complaint. On October 8, 2021, three additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer, have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages. On November 11, 2021, Georgia Power filed a notice to remove the three cases pending in the Superior Court of Monroe County to the U.S. District Court in the Middle District of Georgia. On February 7, 2022, four additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power seeking damages for alleged personal injuries or property damage. On March 9, 2022, Georgia Power filed notices to remove the four additional cases pending in the Superior Court of Monroe County to the U.S. District Court in the Middle District of Georgia. Collectively, these cases include approximately 70 plaintiffs. The amount of any possible losses from these matters cannot be estimated at this time.

In May 2022, Florida Power & Light Company and JEA filed a complaint in the U.S. District Court for the Northern District of Georgia against us and the other co-owners of Plant Scherer alleging that their contractual responsibility for a proportionate share of certain common facility costs relating to future environmental projects at Plant Scherer should be decreased following the retirement of Scherer Unit No. 4 at the end of 2021. While we do not believe that the co-ownership agreements support the arguments raised by Florida Power & Light Company and JEA, if their arguments were to be successful in this case, we could be responsible for an increased percentage of these costs relating to our interests in Scherer Unit Nos. 1 and 2. The amount of additional costs relating to these future projects, if any, cannot be determined at this time.

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Restricted Cash and Investments

3 Months Ended

Mar. 31, 2022

Restricted Investments Note [Abstract]

Restricted Cash and Investments

Restricted Cash and Investments.    Restricted investments consist of funds on deposit with the Rural Utilities Service in the Cushion of Credit Account that are held by the U.S. Treasury, acting through the Federal Financing Bank. We can only utilize these investments for future Rural Utilities Service-guaranteed Federal Financing Bank debt service payments. For the period from January 1, 2021 to September 30, 2021, deposits earned interest at 4% per annum. Beginning October 1, 2021, the rate was set at the 1-year floating treasury rate, which was 0.09% per annum, and will be reset annually on October 1 of each year thereafter. The program no longer allows additional funds to be deposited into the account. At March 31, 2022 and December 31, 2021, we had restricted investments totaling $196,820,000 and $320,052,000, respectively, of which $196,820,000 and $246,350,000, respectively, were classified as current.

Restricted cash consists of collateral posted by our counterparties under our natural gas swap agreements. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the unaudited consolidated balance sheets that sum to the total of the same such amounts reported in the unaudited consolidated statements of cash flows.

Classification
	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Cash and cash equivalents	$	467,353	$	561,101
Restricted cash included in Restricted cash and investments	39,200		—
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$	506,553	$	561,101

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Regulatory Assets and Liabilities

3 Months Ended

Mar. 31, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities.    We apply the accounting guidance for regulated operations. Regulatory assets represent certain costs that are probable of recovery through future rates. We expect to recover such costs from our members in future revenues through rates under the wholesale power contracts we have with each of our members. The wholesale power contracts extend through December 31, 2050. Regulatory liabilities represent certain items of income that we are retaining and that will be applied in the future to reduce revenues required to be recovered from our members.

The following regulatory assets and liabilities are reflected on the consolidated balance sheets as of March 31, 2022 and December 31, 2021.

	2022		2021
	(dollars in thousands)
Regulatory Assets:
Premium and loss on reacquired debt(a)	$	32,199	$	33,200
Amortization of financing leases(b)	33,611		34,179
Outage costs(c)	45,834		31,956
Asset retirement obligations—Ashpond and other(l)	340,209		335,231
Depreciation expense - Plant Vogtle(d)	36,617		36,973
Depreciation expense - Plant Wansley(e)	260,463		204,891
Deferred charges related to Vogtle Units No. 3 and No. 4 training costs(f)	55,105		55,857
Interest rate options cost(g)	132,756		131,556
Deferral of effects on net margin—Smith Energy Facility(h)	141,189		142,675
Other regulatory assets(o)	10,147		2,272
Total Regulatory Assets	$	1,088,130	$	1,008,790
Regulatory Liabilities:
Accumulated retirement costs for other obligations(i)	$	22,371	$	22,197
Deferral of effects on net margin—Hawk Road Energy Facility(h)	17,098		17,253
Major maintenance reserve(j)	81,492		73,059
Amortization of financing leases(b)	7,732		8,457
Deferred debt service adder(k)	142,817		138,897
Asset retirement obligations—Nuclear(l)	97,746		164,256
Revenue deferral plan(m)	353,433		359,799
Natural gas hedges(n)	173,946		63,994
Other regulatory liabilities(o)	1,460		1,537
Total Regulatory Liabilities	$	898,095	$	849,449
Net Regulatory Assets	$	190,035	$	159,341

(a)Represents premiums paid, together with unamortized transaction costs related to reacquired debt that are being amortized over the lives of the refunding debt, which range up to 22 years.

(b)Represents the difference between expense recognized for rate-making purposes versus financial statement purposes related to finance lease payments and the aggregate of the amortization of the asset and interest on the obligation.

(c)Consists of both coal-fired maintenance and nuclear refueling outage costs. Coal-fired outage costs are amortized on a straight-line basis to expense over periods up to 60 months, depending on the operating cycle of each unit. Nuclear refueling outage costs are amortized on a straight-line basis to expense over the 18 or 24-month operating cycles of each unit.

(d)Prior to Nuclear Regulatory Commission (NRC) approval of a 20-year license extension for Plant Vogtle, we deferred the difference between Plant Vogtle depreciation expense based on the then 40-year operating license and depreciation expense assuming an expected 20-year license extension. Amortization commenced upon NRC approval of the license extension in 2009 and is being amortized over the remaining life of the plant.

(e)Represents the deferral of accelerated depreciation associated with the early retirement of Plant Wansley, which is expected by the end of August 2022. Amortization will commence upon retirement of Plant Wansley and end no later than December 31, 2040.

(f)Deferred charges consist of training related costs, including interest and carrying costs of such training. Amortization will commence effective with the commercial operation date of each unit and amortized to expense over the life of the units.

(g)Deferral of premiums paid to purchase interest rate options used to hedge interest rates on certain borrowings, related carrying costs and other incidentals associated with construction of Vogtle Units No. 3 and No. 4. Amortization will commence when Vogtle Unit No. 3 is placed in service.

(h)Effects on net margin for Smith and Hawk Road Energy Facilities were deferred through the end of 2015 and are being amortized over the remaining life of each respective plant.

(i)Represents the accrual of retirement costs associated with long-lived assets for which there are no legal obligations to retire the assets.

(j)Represents collections for future major maintenance costs; revenues are recognized as major maintenance costs are incurred.

(k)Represents collections to fund certain debt payments to be made through the end of 2025 which will be in excess of amounts collected through depreciation expense; the deferred credits will be amortized over the remaining useful life of the plants.

(l)Represents the difference in the timing of recognition of decommissioning costs for financial statement purposes versus ratemaking purposes, as well as the deferral of unrealized gains and losses of funds set aside for decommissioning.

(m)Deferred revenues under a rate management program that allows for additional collections over a five-year period which began in 2018. These amounts will be amortized to income and applied to member billings over the subsequent five-year period.

(n)Represents the deferral of unrealized gains on natural gas hedges.

(o)The amortization periods for other regulatory assets range up to 28 years and the amortization periods of other regulatory liabilities range up to 5 years.

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Member Power Bill Prepayments	3 Months Ended
	Mar. 31, 2022
Member Power Bill Prepayments
Member Power Bill Prepayments	Member Power Bill Prepayments.    We have a power bill prepayment program pursuant to which members can prepay their power bills from us at a discount based on our avoided cost of borrowing. The prepayments are credited against the participating members' power bills in the month(s) agreed upon in advance. The discounts are credited against the power bills and are recorded as a reduction to member revenues. The prepayments are being credited against members' power bills through December 2026, with the majority of the balance scheduled to be credited by the end of 2023.

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Debt

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Debt

Debt.

a)Department of Energy Loan Guarantee:

Pursuant to the loan guarantee program established under Title XVII of the Energy Policy Act of 2005, we and the U.S. Department of Energy, acting by and through the Secretary of Energy, entered into a Loan Guarantee Agreement on February 20, 2014 pursuant to which the Department of Energy agreed to guarantee our obligations under a Note Purchase Agreement, dated as of February 20, 2014 (the Original Note Purchase Agreement), among us, the Federal Financing Bank and the Department of Energy and two future advance promissory notes, each dated February 20, 2014, made by us to the Federal Financing Bank in the aggregate amount of $3,057,069,461 (the Original FFB Notes and together with the Original Note Purchase Agreement, the Original FFB Documents).

On March 22, 2019, we and the Department of Energy entered into an Amended and Restated Loan Guarantee Agreement (as amended, the Loan Guarantee Agreement) which increased the aggregate amount guaranteed by the Department of Energy to $4,676,749,167. We also entered into a Note Purchase Agreement dated as of March 22, 2019 (the Additional Note Purchase Agreement), among us, the Federal Financing Bank and the Department of Energy and a future advance promissory note, dated March 22, 2019, made by us to the Federal Financing Bank in the amount of $1,619,679,706 (the Additional FFB Note and together with the Additional Note Purchase Agreement, the Additional FFB Documents).

Together, the Original FFB Documents and Additional FFB Documents provide for a multi-advance term loan facility (the Facility) under which we may make long-term loan borrowings through the Federal Financing Bank.

Proceeds of advances made under the Facility are used to reimburse us for a portion of certain costs of construction relating to Vogtle Units No. 3 and No. 4 that are eligible for financing under the Title XVII loan guarantee program (Eligible Project Costs). Borrowings under the Original FFB Notes could not exceed $3,057,069,461, of which $335,471,604 was designated for capitalized interest. We have advanced all amounts available under the Original FFB Notes. We were unable to advance $43,721,079 of the amount designated for capitalized interest under the Original FFB Notes due to timing of borrowing and lower than expected interest rates.

Borrowings under the Additional FFB Note may not exceed (i) $1,619,679,706 or (ii) an amount that, when aggregated with borrowings under the Original FFB Notes, equals 70% of Eligible Project Costs less the $1,104,000,000 guarantee payment we received from Toshiba Corporation in late 2017. At March 31, 2022, borrowings under the Additional FFB Note totaled $1,094,000,000.

At March 31, 2022, aggregate Department of Energy-guaranteed borrowings, including capitalized interest, totaled $4,107,348,382.

Under the Loan Guarantee Agreement, we are obligated to reimburse the Department of Energy in the event it is required to make any payments to the Federal Financing Bank under its guarantee. Our payment obligations to the Federal Financing Bank under the FFB Notes and reimbursement obligations to the Department of Energy under its guarantee, but not our covenants to the Department of Energy under the Loan Guarantee Agreement, are secured equally and ratably with all of our other obligations issued under our first mortgage indenture. The final maturity date for each advance is February 20, 2044. Interest is payable quarterly in arrears and principal payments on all advances under the FFB Notes began on February 20, 2020. As of March 31, 2022, we have repaid $217,685,000 of principal on the FFB Notes. Interest rates on advances during the applicable interest rate periods will equal the current average yield on U.S. Treasuries of comparable maturity at the beginning of the interest rate period, plus a spread equal to 0.375%.

Future advances under the Facility are subject to satisfaction of customary conditions, as well as (i) certification of compliance with the requirements of the Title XVII loan guarantee program, (ii) accuracy of project-related representations and warranties, (iii) delivery of updated project-related information, (iv) no Project Adverse Event (as described in Note M) having occurred or, if a Project Adverse Event has occurred, that Co-owners (as described in Note M) representing at least 90% of the ownership interests have voted to continue construction, have not deferred

construction and we have provided the Department of Energy with certain additional information, (v) certification regarding Georgia Power's compliance with certain obligations relating to the Cargo Preference Act, as amended, (vi) evidence of compliance with the applicable wage requirements of the Davis-Bacon Act, as amended, (vii) certification from the Department of Energy's consulting engineer that proceeds of the advance are used to reimburse Eligible Project Costs and (viii) if either the Services Agreement or the Bechtel Agreement (each, as described in Note M) are terminated, or rejected in bankruptcy proceedings, the Department of Energy has approved the replacement agreement.

We may voluntarily prepay outstanding borrowings under the Facility. Under the FFB Documents, any prepayment will be subject to a make-whole premium or discount, as applicable. Any amounts prepaid may not be re-borrowed.

Under the Loan Guarantee Agreement, we are subject to customary borrower affirmative and negative covenants and events of default. In addition, we are subject to project-related reporting requirements and other project-specific covenants and events of default.

If certain events occur, referred to as an "Alternate Amortization Event," at the Department of Energy's option the Federal Financing Bank's commitment to make further advances under the Facility will terminate and we will be required to repay the outstanding principal amount of all borrowings under the Facility over a period of five years, with level principal amortization. These events include (i) abandonment of the Vogtle Units No. 3 and No. 4 project, including a decision by Georgia Power to cancel the project, (ii) cessation of the construction of Vogtle Units No. 3 and No. 4 for twelve consecutive months, (iii) termination of the Services Agreement or rejection of the Services Agreement in bankruptcy, if Georgia Power does not maintain access to certain related intellectual property rights, (iv) termination of the Services Agreement by Westinghouse or termination of the Bechtel Agreement by Bechtel Power Corporation, (v) delivery of certain notices by the Co-owners to the Department of Energy of their intent to cancel construction of Vogtle Units No. 3 and No. 4 coupled with termination by the Co-owners of the Services Agreement or the Bechtel Agreement, (vi) failure of the Co-owners to enter into a replacement contract with respect to the Services Agreement or the Bechtel Agreement following the Co-owners' termination of such agreement with the intent to replace it, (vii) the Department of Energy's takeover of construction of Vogtle Units No. 3 and No. 4 under certain conditions, (viii) the occurrence of any Project Adverse Event that results in a cancellation of the Vogtle Units No. 3 and No. 4 project or the cessation or deferral of construction beyond the periods permitted under the Loan Guarantee Amendment, (ix) loss of or failure to receive necessary regulatory approvals under certain circumstances, (x) loss of access to intellectual property rights necessary to construct or operate Vogtle Units No. 3 and No. 4 under certain circumstances, (xi) our failure to fund our share of operation and maintenance expenses for Vogtle Units No. 3 and No. 4 for twelve consecutive months, (xii) change of control of Oglethorpe and (xiii) certain events of loss or condemnation. If we receive proceeds from an event of condemnation relating to Vogtle Units No. 3 and No. 4, such proceeds must be applied to immediately prepay outstanding borrowings under the Facility.

b)Rural Utilities Service Guaranteed Loans:

For the three-month period ended March 31, 2022, we received advances on Rural Utilities Service-guaranteed Federal Financing Bank loans totaling $30,185,000 for long-term financing of general and environmental improvements at existing plants.

In April 2022, we received an additional $22,318,000 in advances on Rural Utilities Service-guaranteed Federal Financing Bank loans for long-term financing of general and environmental improvements at existing plants.

c)First Mortgage Bonds:

On April 12, 2022, we issued $500,000,000 of 4.50% first mortgage bonds, Series 2022A, for the purpose of providing long-term financing for expenditures related to the construction of Vogtle Units No. 3 and No. 4. In conjunction with the issuance of the bonds, we repaid $493,405,000 of outstanding commercial paper, which was classified as long-term debt at March 31, 2022. The bonds are due to mature April 2047 and are secured under our first mortgage indenture.

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Vogtle Units No. 3 and No. 4 Construction Project

3 Months Ended

Mar. 31, 2022

Vogtle Units No. 3 and No. 4 Construction Project

Vogtle Units No. 3 and No. 4 Construction Project

Vogtle Units No. 3 and No. 4 Construction Project.  We, Georgia Power, the Municipal Electric Authority of Georgia, and the City of Dalton, Georgia, acting by and through its Board of Water, Light and Sinking Fund Commissioners, doing business as Dalton Utilities (collectively, the Co-owners) are parties to an Ownership Participation Agreement that, along with other agreements, governs our participation in two additional nuclear units under construction at Plant Vogtle, Units No. 3 and No. 4. The Co-owners appointed Georgia Power to act as agent under this agreement. Our ownership interest and proportionate share of the cost to construct these units is currently 30%, representing approximately 660 megawatts. Pursuant to this agreement, Georgia Power has designated Southern Nuclear Operating

Company, Inc. as its agent for licensing, engineering, procurement, contract management, construction and pre-operation services.

In 2008, Georgia Power, acting for itself and as agent for the Co-owners, entered into an Engineering, Procurement and Construction Agreement (the EPC Agreement) with Westinghouse Electric Company LLC and Stone & Webster, Inc., which was subsequently acquired by Westinghouse and changed its name to WECTEC Global Project Services Inc. (collectively, Westinghouse). Pursuant to the EPC Agreement, Westinghouse agreed to design, engineer, procure, construct and test two 1,100 megawatt nuclear units using the Westinghouse AP1000 technology and related facilities at Plant Vogtle.

Until March 2017, construction on Units No. 3 and No. 4 continued under the substantially fixed price EPC Agreement. In March 2017, Westinghouse filed for bankruptcy protection under Chapter 11 of the United States Bankruptcy Code. Effective in July 2017, Georgia Power, acting for itself and as agent for the other Co-owners, and Westinghouse entered into a services agreement (the Services Agreement), pursuant to which Westinghouse is providing facility design and engineering services, procurement and technical support and staff augmentation on a time and materials cost basis. The Services Agreement provides that it will continue until the start-up and testing of Vogtle Units No. 3 and No. 4 is complete and electricity is generated and sold from both units. The Services Agreement is terminable by the Co-owners upon 30 days' written notice.

In October 2017, Georgia Power, acting for itself and as agent for the other Co-owners, entered into a construction completion agreement with Bechtel Power Corporation, pursuant to which Bechtel serves as the primary contractor for the remaining construction activities for Vogtle Units No. 3 and No. 4 (the Bechtel Agreement). The Bechtel Agreement is a cost reimbursable plus fee arrangement, whereby Bechtel is reimbursed for actual costs plus a base fee and an at-risk fee, which is subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Co-owner is severally, and not jointly, liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Co-owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Co-owners will be required to pay amounts related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Co-owner suspensions of work, certain breaches of the Bechtel Agreement by the Co-owners, Co-owner insolvency and certain other events.

Cost and Schedule

Our current budget for our 30% ownership interest in Vogtle Units No. 3 and No. 4, which includes capital costs, allowance for funds used during construction, our allocation of the project-level contingency and a separate Oglethorpe-level contingency is $8.5 billion and is based on commercial operation dates of March 2023 and December 2023 for Units No. 3 and No. 4, respectively. At March 31, 2022, our total investment in the additional Vogtle units was approximately $7.2 billion. We and some of our members have implemented various rate management programs to lessen the impact on rates when Vogtle Units No. 3 and No. 4 reach commercial operation.

We and our members are currently evaluating exercising the tender option discussed below which would cap our capital costs described above in exchange for a proportionate reduction of our 30% interest in the two new units. Based on the current project budget and schedule and our interpretation of the Global Amendments (described below), if we decide to exercise the tender option, our budget would be $8.1 billion and we would transfer and release from the lien of the first mortgage indenture approximately 42 megawatts, out of 660 megawatts, to Georgia Power. Our resulting ownership share would decline from 30% to approximately 28%. However, if the total project budget exceeds the current budget, our ownership share and megawatts could be further reduced. In addition to requiring approval by our board, any decision regarding the tender option will require certain member approvals.

We have a budget contingency for our interest that is separate and in addition to the project-level contingency. The Oglethorpe-level contingency, which we have carried at various levels since the beginning of the project, provides additional margin to cover potential cost, schedule, and financing risks associated with our share of the project which may not be covered by project-level contingencies. As construction progresses, the Oglethorpe-level contingency may continue to fluctuate as it represents the difference between known project-level costs and contingencies and our total budget. At the end of the project, if there is remaining Oglethorpe-level contingency, we will adjust our project budget to remove this contingency and bill our members based on the actual project costs. The table below shows our project

budgets and actual costs through March 31, 2022 for our share of the project.

	(in millions)
	Project Budget - No Tender		Project Budget - Tender		Actual Costs at March 31, 2022
Construction Costs (1)	$	6,487	$	6,096	$	5,621
Financing Costs	1,922		1,914		1,561
Total Costs	$	8,409	$	8,010	$	7,182
Project-Level Contingency	$	70	$	70	$	—
Oglethorpe-Level Contingency	21		20		—
Total Contingency	$	91	$	90	$	—
Totals	$	8,500	$	8,100	$	7,182
(1) Construction costs are net of $1.1 billion we received from Toshiba Corporation under a Guarantee Settlement Agreement.

If we do not exercise the tender option, any schedule extension beyond March 2023 and December 2023 for Units No. 3 and No. 4, respectively, is expected to impact our cost by approximately $75 million per month for both units and approximately $30 million per month for Unit No. 4 only, including financing costs. If we exercise the tender option, we expect each additional month of delay to increase our financing costs by approximately $30 million per month for both units and approximately $12 million per month for Unit No. 4.

As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts on a regular basis to incorporate current information available, particularly in the areas of engineering support, commodity installation, system turnovers and related test results and workforce statistics.

Since March 2020, the number of active cases of COVID-19 at the site has fluctuated consistent with the surrounding area and impacted productivity levels and pace of activity completion. COVID-19 has exacerbated the challenges facing the project, including, but not limited to, higher than expected absenteeism; overall construction and subcontractor labor productivity; system turnover and testing activities; and electrical equipment and commodity installation. As of March 31, 2022, the incremental cost associated with COVID-19 mitigation actions and impacts on construction productivity is estimated by Georgia Power to be between $350 million and $438 million (of which our 30% interest is $105 million to $131 million) and is included in the project budget. The continuing effects of the COVID-19 pandemic could further disrupt or delay construction, testing, supervisory, and support activities at Vogtle Units No. 3 and No. 4.

The Unit No. 3 projected schedule primarily depends on construction productivity and production levels, the volume and completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining inspection, tests, analyses and acceptance criteria and begin fuel load, the pace of system and area turnovers, and the progression of startup and other testing. Georgia Power has disclosed that it projects an in-service date for Unit No. 3 by the end of the first quarter of 2023. Our current budgets reflect our expectation of an in-service date for Unit No. 3 in March 2023.

Georgia Power has disclosed that it projects an in-service date for Unit No. 4 by the end of the fourth quarter 2023. Our current budgets anticipate an in-service date for Unit No. 4 in December 2023. Meeting the projected in-service date for Unit No. 4 primarily depends on overall construction productivity and production levels significantly improving as well as appropriate levels of craft laborers, particularly electricians and pipefitters, being added and maintained.

During the first quarter of 2022, Georgia Power assigned $95 million of established construction contingency and additional costs (of which our 30% share was $29 million) to the base capital costs forecast primarily associated with construction productivity, the pace of system turnovers, and support resources for Units No. 3 and No. 4. Georgia Power has stated its expectation to allocate the remainder of the project-level contingency by completion of the project.

As Unit No. 3 completes system turnover from construction and moves to testing and transition to operations, ongoing and potential future challenges include construction productivity, completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining inspections, tests, analyses, and acceptance criteria and begin fuel load, and final component and pre-operational tests. As Unit No. 4 progresses through construction and transitions into testing, ongoing and potential future challenges include the pace and quality of electrical installation; availability of craft and supervisory resources, including the

temporary diversion of such resources to support Unit No. 3 construction efforts; and the pace of work package closures and system turnovers; and the timeframe and duration of hot functional and other testing. As construction, including subcontract work, continues on both Units No. 3 and No. 4, ongoing or future challenges include management of contractors and vendors; subcontractor performance; supervision of craft labor and related productivity, particularly in the installation of electrical, mechanical, and instrumentation and controls commodities, ability to attract and retain craft labor, and/or related cost escalation; and procurement and related installation. New challenges may arise, particularly as Units No. 3 and No. 4 move into initial testing and start-up, which may result in required engineering changes or remediation related to plant systems, structures or components (some of which are based on new technology that only within the last few years began initial operation in the global nuclear industry at this scale). The ongoing and potential future challenges described above may further impact the projected schedule and estimated cost.

There have been technical and procedural challenges to the construction and licensing of Vogtle Units No. 3 and No. 4 at the federal and state level and additional challenges may arise. In addition, certain license amendment requests have been filed and approved or are pending before the Nuclear Regulatory Commission. Processes are in place that are designed to ensure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the Nuclear Regulatory Commission that occur throughout construction. In connection with the additional construction remediation work described above, Southern Nuclear reviewed the project’s construction quality programs and, where needed, is implementing improvement plans consistent with these processes. On March 25, 2022, the Nuclear Regulatory Commission completed its follow up inspection related to the November 2021 final significance report on its special inspection to review the root cause of this additional construction remediation work and the corresponding corrective action plans. The Nuclear Regulatory Commission closed the findings identified in November 2021 and returned Unit No. 3 to the Nuclear Regulatory Commission’s baseline inspection program.

Various design and other licensing-based compliance matters, including the timely submittal by Southern Nuclear of the inspections, tests, analyses, and acceptance criteria documentation for each unit and the related reviews and approvals by the Nuclear Regulatory Commission necessary to support authorization to load fuel, have arisen and may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues, including inspections, tests, analyses, and acceptance criteria, are not resolved in a timely manner, there may be further delays in the project schedule that could result in increased costs to the Co-owners.

The ultimate outcome of these matters cannot be determined at this time.

Co-Owner Contracts and Other Information

In November 2017, the Co-owners entered into an amendment to their joint ownership agreements for Vogtle Units No. 3 and No. 4 to provide for, among other conditions, additional Co-owner approval requirements. These joint ownership agreements, including the Co-owner approval requirements, were subsequently amended, effective August 31, 2018. As described below, certain provisions of the Joint Ownership Agreements were modified further on September 26, 2018 by the Term Sheet that was memorialized on February 18, 2019 when the Co-owners entered into certain amendments (the Global Amendments) to the Joint Ownership Agreements (as amended, the Joint Ownership Agreements).

As a result of an increase in the total project capital cost forecast and Georgia Power’s decision not to seek recovery of its allocation of the increase in the base capital costs and the increased construction budget in connection with Georgia Power’s nineteenth Vogtle construction monitoring (VCM) report in 2018, the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 were required to vote to continue construction. In September 2018, the Co-owners unanimously voted to continue construction of Vogtle Units No. 3 and No. 4.

In connection with the September 2018 vote to continue construction, Georgia Power entered into a binding term sheet with the other Co-owners and MEAG’s wholly-owned subsidiaries MEAG Power SPVJ, LLC, MEAG Power SPVM, LLC, and MEAG Power SPVP, LLC to mitigate certain financial exposure for the other Co-owners and offered to purchase production tax credits from each of the other Co-Owners, at that Co-owner’s option (the Term Sheet). On February 18, 2019, the Co-owners entered into the Global Amendments to memorialize the provisions of the Term Sheet. Pursuant to the Global Amendments and consistent with the Term Sheet, the Joint Ownership Agreements provide that:

•each Co-owner is obligated to pay its proportionate share of construction costs for Vogtle Units No. 3 and No. 4 based on its ownership interest up to (i) the estimated cost at completion ("EAC") for Vogtle Units No. 3 and No. 4 which formed the basis of Georgia Power's forecast of $8.4 billion in Georgia Power's nineteenth VCM report filed with the Georgia Public Service Commission plus (ii) $800 million of additional construction costs;

•Georgia Power will be responsible for 55.7% of construction costs, subject to exceptions such as costs that are a result of a force majeure event, that exceed the EAC in the nineteenth VCM report by $800 million to $1.6 billion (resulting in up to $80 million of potential additional costs to Georgia Power which would save Oglethorpe up to $44 million), with the remaining Co-owners responsible for 44.3% of such costs pro rata in accordance with their respective ownership interests (equal to 24.5% for our 30% ownership interest); and

•Georgia Power will be responsible for 65.7% of construction costs, subject to exceptions such as costs that are a result of a force majeure event, that exceed the EAC in the nineteenth VCM report by $1.6 billion to $2.1 billion (resulting in up to a further $100 million of potential additional costs to Georgia Power which would save Oglethorpe up to an additional $55 million), with the remaining Co-owners responsible for 34.3% of such costs pro rata in accordance with their respective ownership interests (equal to 19.0% for our 30% ownership interest).

If the EAC is revised and exceeds the EAC in the nineteenth VCM report by more than $2.1 billion, each of the Co-owners, other than Georgia Power, will have a one-time option to tender a portion of its ownership interest to Georgia Power in exchange for Georgia Power’s agreement to pay 100% of such Co-owner’s share of construction costs actually incurred in excess of the EAC in the nineteenth VCM report plus $2.1 billion. If any Co-owner elects to exercise this tender option, Georgia Power would have the option to cancel the project in lieu of accepting the offer to purchase a portion of the Co-owner’s ownership interest. If Georgia Power does not elect to cancel the project, then Georgia Power must accept the offer, and the ownership interest to be conveyed from the tendering Co-owner to Georgia Power will be calculated based on the percentage of the cumulative amount of construction costs paid by such tendering Co-owner as of the commercial operation date of Vogtle Unit No. 4. For purposes of this calculation, payments made by Georgia Power on behalf of the tendering Co-owner in accordance with the second and third bullets above will be treated as payments made by that Co-owner. This option to tender a portion of our interest to Georgia Power upon such a budget increase would allow us to freeze our construction budget associated with the Vogtle project in exchange for a proportionate reduction of our 30% ownership interest. In November 2021, Georgia Power and the other Co-owners clarified the process to exercise the tender option to require that a Co-owner desiring to exercise the tender option must do so between 120 and 180 days after the tender option is triggered.

The nineteenth VCM report total project cost is $17.1 billion (which excludes non-shareable costs) as reflected in numerous Georgia Public Service Commission filings. As of December 31, 2021, budget increases since the nineteenth VCM have reached $3.4 billion for all Co-owners. As a result of these increases, we believe that the tender option was triggered at the Co-owner construction budget vote on February 14, 2022 and that Georgia Power’s increased responsibility for certain construction costs as described above commenced in March 2022. Georgia Power and the other Co-owners do not agree on the dollar amount that triggers each Co-owner’s option to tender a portion of its ownership interest to Georgia Power under the tender option or the extent to which costs that are the result of a force majeure event (such as COVID-19) impact the point at which the tender option is triggered. For purposes of determining when the Co-owners’ option to tender has been triggered, the Global Amendments do not exclude costs resulting from force majeure events (such as COVID-19) from the calculation of when the EAC in the nineteenth VCM report plus $2.1 billion has been reached. Georgia Power and the other Co-owners also do not agree on the dollar amount that triggers Georgia Power’s increased responsibility for certain construction costs as described above, and the extent to which costs that are the result of a force majeure event (such as COVID-19), impact the calculation of the point at which Georgia Power’s increased responsibility for certain construction costs as described above is triggered. The exclusion of costs resulting from a force majeure event (such as COVID-19) in the Global Amendments only applies to Georgia Power’s increased cost responsibility during the time period when construction costs exceed the EAC in the nineteenth VCM report by $800 million to $2.1 billion. Accordingly, in March 2022, we notified Georgia Power of a billing dispute with regards to both the starting dollar amount and the application of costs resulting from a force majeure event and how such amounts impact the thresholds and timing of the cost-sharing and tender option provisions. This notice commenced the dispute resolution procedures set forth in the Ownership Participation Agreement for the additional Vogtle units.

Our ownership interest in Vogtle Units No. 3 and No. 4 continues to be 30%; however, this could decrease if we exercise our option to tender a portion of our ownership interest and require Georgia Power to pay 100% of the remaining share of the costs necessary to complete the units. Our decremental ownership interest would be calculated and conveyed to Georgia Power after both Vogtle units are placed in service. Based on the current project budget and on our interpretation of the Global Amendments, if we decide to exercise the tender option, we would transfer approximately 42 megawatts, out of 660 megawatts, to Georgia Power. Our resulting ownership share would decline from 30% to approximately 28%.

Pursuant to the Joint Ownership Agreements, as amended by the Global Amendments, the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 must vote to continue construction, or can vote to suspend construction, if certain adverse events occur, including: (i) the bankruptcy of Toshiba Corporation; (ii) termination or

rejection in bankruptcy of certain agreements, including the Services Agreement, the Bechtel Agreement or the agency agreement with Southern Nuclear; (iii) Georgia Power publicly announces its intention not to submit for rate recovery any portion of its investment in Vogtle Units No. 3 and No. 4 (or associated financing costs) or the Georgia Public Service Commission determines that any of Georgia Power's costs relating to the construction of Vogtle Units No. 3 and No. 4 will not be recovered in retail rates, excluding any additional amounts paid by Georgia Power on behalf of the other Co-owners pursuant to the Global Amendment provisions described above and the first 6% of costs during any six-month VCM reporting period that are disallowed by the Georgia Public Service Commission for recovery, or for which Georgia Power elects not to seek cost recovery, through retail rates or (iv) an incremental extension of one year or more from the seventeenth VCM report estimated in-service dates of November 2021 and November 2022 for Units No. 3 and No. 4, respectively (each, a Project Adverse Event). The schedule extensions, announced in February 2022, which reflected a cumulative delay of over a year for each unit from the schedules approved in the seventeenth VCM report, triggered the requirement for the holders of at least 90% of the ownership interests in Vogtle Units No. 3 and No. 4 to vote to continue construction, and the Co-owners unanimously voted to continue construction.

The Global Amendments provide that Georgia Power may cancel the project at any time at its sole discretion. In the event that Georgia Power determines to cancel the project or fewer than 90% of the Co-owners vote to continue construction upon the occurrence of a subsequent project adverse event, we and the other Co-owners would assess our options for the Vogtle project. If the investment were to be written off, we would seek regulatory accounting treatment to amortize the investment over a long-term period, which requires the approval of our board of directors, and we would submit the regulatory accounting treatment details to the Rural Utilities Service for its approval. Further, if Georgia Power or the Co-owners decided to cancel the project, the Department of Energy would have the discretion to require that we repay all amounts outstanding under our loan guarantee agreement with the Department of Energy over a five-year period as discussed in Note L of Notes to Unaudited Consolidated Financial Statements.

The ultimate outcome of these matters cannot be determined at this time.

See “Item 1A – RISK FACTORS” in our 2021 Form 10-K for a discussion of certain risks associated with the licensing, construction, financing and operation of nuclear generating units.

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Measurement of Credit Losses on Financial Instruments	3 Months Ended
	Mar. 31, 2022
Accounting Policies [Abstract]
Measurement of Credit Losses on Financial Instruments	Measurement of Credit Losses on Financial Instruments. The financial assets we hold that are subject to credit losses (Topic 326) are predominately accounts receivable and certain cash equivalents classified as held-to-maturity debt (e.g. commercial paper). Our receivables are generally due within thirty days or less with a significant portion related to billings to our members. See Note F for information regarding our member receivables. Commercial paper issuances we invest in are rated as investment grade and backed by a credit facility. Given our historical experience, the short duration lifetime of these financial assets and the short time horizon over which to consider expectations of future economic conditions, we have assessed that non-collection of the cost basis of these financial assets is remote and we have not recognized an allowance for credit losses.

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Recently Issued or Adopted Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2022

Accounting Standards Update and Change in Accounting Principle [Abstract]

Recently Issued or Adopted Accounting Pronouncements

Recently Issued or Adopted Accounting Pronouncements.   In March 2020, the Financial Accounting Standards Board (FASB) issued “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting”. The amendments in this update apply to all entities that have contracts, hedging relationships, and other transactions that reference London Interbank Offered Rate (LIBOR) or another reference rate expected to be discontinued because of reference rate reform. The amendments in this update provide optional expedients and exceptions for applying U.S. GAAP to transactions affected by reference rate reform if certain criteria are met. The expedients and exceptions provided by the amendments in this update do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, for which an entity has elected certain optional expedients that are retained through the end of the hedging relationship.

In January 2021, the FASB issued “Reference Rate Reform (Topic 848): Scope,” to further clarify the scope of the reference rate reform guidance in Topic 848. The amendments in this update refine the scope of Topic 848 to clarify that certain optional expedients and exceptions therein for contract modifications and hedge accounting apply to contracts that are affected by the discounting transition. Specifically, modifications related to reference rate reform would not be considered an event that requires reassessment of previous accounting conclusions. The amendments in this update also amend the expedients and exceptions in Topic 848 to capture the incremental consequences of the scope clarification and to tailor the existing guidance to derivative instruments affected by the discounting transition.

The amendments in these updates are effective for all entities as of March 12, 2020 through December 31, 2022. We have fully completed our evaluation of this new standard and we do not expect this standard will have a material impact on our consolidated financial statements.

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The tables below detail assets and liabilities measured at fair value on a recurring basis at March 31, 2022 and December 31, 2021.

	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	March 31, 2022		(Level 1)		(Level 2)		(Level 3)
	(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity	$	237,403	$	237,403	$	—	$	—
International equity trust	126,621		—		126,621		—
Corporate bonds and debt	47,987		—		46,718		1,269
US Treasury securities	102,406		102,406		—		—
Mortgage backed securities	22,192		—		22,192		—
Domestic mutual funds	68,348		68,348		—		—
Municipal bonds	809		—		809		—
Federal agency securities	2,268		—		2,268		—
Other	7,213		7,213		—		—
Long-term investments:
International equity trust	36,959		—		36,959		—
Corporate bonds and debt	4,129		—		2,938		1,191
US Treasury securities	40,382		40,382		—		—
Mortgage backed securities	—		—		—		—
Domestic mutual funds	271,155		271,155		—		—
Federal agency securities	—		—		—		—
Treasury STRIPS	350,275		—		350,275		—
Other	(79)		(79)		—		—
Natural gas swaps	173,946		—		173,946		—

	Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
	December 31, 2021		(Level 1)		(Level 2)		(Level 3)
	(dollars in thousands)
Nuclear decommissioning trust funds:
Domestic equity	$	249,999	$	249,999	$	—	$	—
International equity trust	140,718		—		140,718		—
Corporate bonds and debt	72,936		—		72,369		567
US Treasury securities	53,321		53,321		—		—
Mortgage backed securities	40,460		—		40,460		—
Domestic mutual funds	75,384		75,384		—		—
Municipal bonds	1,133		—		1,133		—
Federal agency securities	9,608		—		9,608		—
Other	16,351		13,623		2,728		—
Long-term investments:
International equity trust	35,873		—		35,873		—
Corporate bonds and debt	14,022		—		12,656		1,366
US Treasury securities	15,259		15,259		—		—
Mortgage backed securities	12,021		—		12,021		—
Domestic mutual funds	277,937		277,937		—		—
Federal agency securities	257		—		257		—
Treasury STRIPS	350,532		—		350,532		—
Other	5,478		5,478		—		—
Natural gas swaps	63,994		—		63,994		—

Schedule of estimated fair values of long-term debt, including current maturities

The estimated fair values of our long-term debt, including current maturities at March 31, 2022 and December 31, 2021 were as follows:

	2022				2021
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Long-term debt	$	10,830,072	$	11,338,418	$	10,915,054	$	12,741,046

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of notional volume of natural gas derivatives that is expected to settle or mature each year

The following table reflects the notional volume of our natural gas derivatives as of March 31, 2022 that is expected to settle or mature each year:

Year	Natural Gas Swaps (MMBTUs)  (in millions)
2022	21.6
2023	26.8
2024	25.3
2025	21.2
2026	16.0
2027	0.9
Total	111.8

Schedule of fair value of derivative instruments and effect on consolidated balance sheets

The table below reflects the fair value of derivative instruments and their effect on our consolidated balance sheets at March 31, 2022 and December 31, 2021.

	Balance Sheet Location	Fair Value
		2022		2021
		(dollars in thousands)
Assets:
Natural gas swaps	Other current assets	$	74,299	$	23,596
Natural gas swaps	Other deferred charges	$	99,647	$	40,398
Liabilities:
Natural gas swaps	Other current liabilities	$	—	$	—
Natural gas swaps	Other deferred credits	$	—	$	—

Schedule of the realized gains and (losses) on derivative instruments recognized in margin

The following table presents the gross realized gains and (losses) on derivative instruments recognized in net margins for the three months ended March 31, 2022 and 2021.

	Statement of Revenues and Expenses Location	Three Months Ended March 31,
		2022		2021
		(dollars in thousands)
Natural gas swaps gains	Fuel	$	8,078	$	101
Natural gas swaps losses	Fuel	(79)		(1,244)
Total		$	7,999	$	(1,143)

Schedule of unrealized losses on derivative instruments deferred on the balance sheet

The following table presents the unrealized gains on derivative instruments deferred on the balance sheet at March 31, 2022 and December 31, 2021.

	Balance Sheet Location	2022		2021
		(dollars in thousands)
Natural gas swaps	Regulatory liability	$	173,946	$	63,994
Total		$	173,946	$	63,994

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of debt and equity securities

The following tables summarize debt and equity securities as of March 31, 2022 and December 31, 2021.

	Gross Unrealized
	(dollars in thousands)
March 31, 2022	Cost		Gains		Losses		Fair Value
Equity	$	310,055	$	236,875	$	(4,239)	$	542,691
Debt	792,554		446		(24,757)		768,243
Other	7,134		—		—		7,134
Total	$	1,109,743	$	237,321	$	(28,996)	$	1,318,068

	Gross Unrealized
	(dollars in thousands)
December 31, 2021	Cost		Gains		Losses		Fair Value
Equity	$	304,305	$	280,127	$	(4,682)	$	579,750
Debt	774,580		4,859		(7,001)		772,438
Other	19,102		—		(1)		19,101
Total	$	1,097,987	$	284,986	$	(11,684)	$	1,371,289

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Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2022

Revenue from Contract with Customer [Abstract]

Schedule of sales to members and sales to non-members

Sales to members for the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022			2021
Capacity revenues	$	243,291		$	255,824
Energy revenues	174,158			120,448
Total	$	417,449		$	376,272
Member energy requirements supplied	57		%	55		%

Sales to non-members during the three months ended March 31, 2022 and 2021 were as follows:

	Three Months Ended March 31,
	(dollars in thousands)
	2022		2021
Energy revenues	$	2,993	$	59

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Leases (Tables)

3 Months Ended

Mar. 31, 2022

Leases [Abstract]

Schedule of balance sheet impact of leases

For lease agreements entered into or reassessed after the adoption of the new leases standard, we combine lease and nonlease components.

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Finance leases
Right-of-use assets	$	302,732	$	302,732
Less: Accumulated provision for depreciation	(268,923)		(267,606)
Total finance lease assets	$	33,809	$	35,126
Lease liabilities—Finance leases
Obligations under finance leases	$	61,335	$	61,335
Long-term debt and finance leases due within one year	7,541		7,541
Total finance lease liabilities	$	68,876	$	68,876

Classification	March 31, 2022		December 31, 2021
	(dollars in thousands)
Right-of-Use Assets—Operating leases
Electric plant in service, net	$	2,086	$	2,293
Total operating lease assets	$	2,086	$	2,293
Lease liabilities—Operating leases
Capitalization—Other	$	1,301	$	1,550
Other current liabilities	798		838
Total operating lease liabilities	$	2,099	$	2,388

Schedule of lease cost

		Three months ended
Lease Cost	Classification	March 31, 2022		March 31, 2021
		(dollars in thousands)
Finance lease cost:
Amortization of leased assets	Depreciation and amortization	$	1,885	$	1,516
Interest on lease liabilities	Interest expense	1,852		2,044
Operating lease cost:	Inventory(1) & production expense	222		270
Total leased cost		$	3,959	$	3,830

(1) The majority of our operating lease costs relate to our railcar leases and such costs are added to the cost of our fossil-fuel inventories and are recognized in fuel expense as the inventories are consumed.

Summary of lease terms and discount rates

	March 31, 2022		December 31, 2021
Lease Term and Discount Rate:
Weighted-average remaining lease term (in years)
Finance leases	6.65		6.90
Operating leases	8.60		8.01
Weighted-average discount rate:
Finance leases	11.05	%	11.05	%
Operating leases	4.84	%	4.73	%

Schedule of cash paid for amounts included in the measurement of lease liabilities

	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Other Information:
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	303	$	351
Right-of-use assets obtained in exchange for new operating lease liabilities	$	—	$	—

Schedule of maturities of finance and operating lease liabilities

Maturity analysis of our finance and operating lease liabilities as of March 31, 2022 is as follows:

	(dollars in thousands)
Year Ending December 31,	Finance Leases		Operating Leases		Total
2022	$	14,949	$	626	$	15,575
2023	14,949		708		15,657
2024	14,949		234		15,183
2025	14,949		72		15,021
2026	14,949		72		15,021
Thereafter	25,633		940		26,573
Total lease payments	$	100,378	$	2,652	$	103,030
Less: imputed interest	(31,502)		(553)		(32,055)
Present value of lease liabilities	$	68,876	$	2,099	$	70,975

Schedule of lessor's income from leases

Lease income recognized during the three months ended March 31, 2022 and 2021 was as follows:

	Three Months Ended March 31,
	2022		2021
	(dollars in thousands)
Lease income	$	1,645	$	1,597

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Restricted Cash and Investments (Tables)

3 Months Ended

Mar. 31, 2022

Restricted Investments Note [Abstract]

Reconciliation of Cash, Cash Equivalents, and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the unaudited consolidated balance sheets that sum to the total of the same such amounts reported in the unaudited consolidated statements of cash flows.

Classification
	Three months ended
	March 31, 2022		March 31, 2021
	(dollars in thousands)
Cash and cash equivalents	$	467,353	$	561,101
Restricted cash included in Restricted cash and investments	39,200		—
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$	506,553	$	561,101

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Regulatory Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of regulatory assets and liabilities

The following regulatory assets and liabilities are reflected on the consolidated balance sheets as of March 31, 2022 and December 31, 2021.

	2022		2021
	(dollars in thousands)
Regulatory Assets:
Premium and loss on reacquired debt(a)	$	32,199	$	33,200
Amortization of financing leases(b)	33,611		34,179
Outage costs(c)	45,834		31,956
Asset retirement obligations—Ashpond and other(l)	340,209		335,231
Depreciation expense - Plant Vogtle(d)	36,617		36,973
Depreciation expense - Plant Wansley(e)	260,463		204,891
Deferred charges related to Vogtle Units No. 3 and No. 4 training costs(f)	55,105		55,857
Interest rate options cost(g)	132,756		131,556
Deferral of effects on net margin—Smith Energy Facility(h)	141,189		142,675
Other regulatory assets(o)	10,147		2,272
Total Regulatory Assets	$	1,088,130	$	1,008,790
Regulatory Liabilities:
Accumulated retirement costs for other obligations(i)	$	22,371	$	22,197
Deferral of effects on net margin—Hawk Road Energy Facility(h)	17,098		17,253
Major maintenance reserve(j)	81,492		73,059
Amortization of financing leases(b)	7,732		8,457
Deferred debt service adder(k)	142,817		138,897
Asset retirement obligations—Nuclear(l)	97,746		164,256
Revenue deferral plan(m)	353,433		359,799
Natural gas hedges(n)	173,946		63,994
Other regulatory liabilities(o)	1,460		1,537
Total Regulatory Liabilities	$	898,095	$	849,449
Net Regulatory Assets	$	190,035	$	159,341

(a)Represents premiums paid, together with unamortized transaction costs related to reacquired debt that are being amortized over the lives of the refunding debt, which range up to 22 years.

(b)Represents the difference between expense recognized for rate-making purposes versus financial statement purposes related to finance lease payments and the aggregate of the amortization of the asset and interest on the obligation.

(c)Consists of both coal-fired maintenance and nuclear refueling outage costs. Coal-fired outage costs are amortized on a straight-line basis to expense over periods up to 60 months, depending on the operating cycle of each unit. Nuclear refueling outage costs are amortized on a straight-line basis to expense over the 18 or 24-month operating cycles of each unit.

(d)Prior to Nuclear Regulatory Commission (NRC) approval of a 20-year license extension for Plant Vogtle, we deferred the difference between Plant Vogtle depreciation expense based on the then 40-year operating license and depreciation expense assuming an expected 20-year license extension. Amortization commenced upon NRC approval of the license extension in 2009 and is being amortized over the remaining life of the plant.

(e)Represents the deferral of accelerated depreciation associated with the early retirement of Plant Wansley, which is expected by the end of August 2022. Amortization will commence upon retirement of Plant Wansley and end no later than December 31, 2040.

(f)Deferred charges consist of training related costs, including interest and carrying costs of such training. Amortization will commence effective with the commercial operation date of each unit and amortized to expense over the life of the units.

(g)Deferral of premiums paid to purchase interest rate options used to hedge interest rates on certain borrowings, related carrying costs and other incidentals associated with construction of Vogtle Units No. 3 and No. 4. Amortization will commence when Vogtle Unit No. 3 is placed in service.

(h)Effects on net margin for Smith and Hawk Road Energy Facilities were deferred through the end of 2015 and are being amortized over the remaining life of each respective plant.

(i)Represents the accrual of retirement costs associated with long-lived assets for which there are no legal obligations to retire the assets.

(j)Represents collections for future major maintenance costs; revenues are recognized as major maintenance costs are incurred.

(k)Represents collections to fund certain debt payments to be made through the end of 2025 which will be in excess of amounts collected through depreciation expense; the deferred credits will be amortized over the remaining useful life of the plants.

(l)Represents the difference in the timing of recognition of decommissioning costs for financial statement purposes versus ratemaking purposes, as well as the deferral of unrealized gains and losses of funds set aside for decommissioning.

(m)Deferred revenues under a rate management program that allows for additional collections over a five-year period which began in 2018. These amounts will be amortized to income and applied to member billings over the subsequent five-year period.

(n)Represents the deferral of unrealized gains on natural gas hedges.

(o)The amortization periods for other regulatory assets range up to 28 years and the amortization periods of other regulatory liabilities range up to 5 years.

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Vogtle Units No. 3 and No. 4 Construction Project (Tables)

3 Months Ended

Mar. 31, 2022

Vogtle Units No. 3 and No. 4 Construction Project

Schedule of Project Budget and Actual Costs

The table below shows our project budgets and actual costs through March 31, 2022 for our share of the project.

	(in millions)
	Project Budget - No Tender		Project Budget - Tender		Actual Costs at March 31, 2022
Construction Costs (1)	$	6,487	$	6,096	$	5,621
Financing Costs	1,922		1,914		1,561
Total Costs	$	8,409	$	8,010	$	7,182
Project-Level Contingency	$	70	$	70	$	—
Oglethorpe-Level Contingency	21		20		—
Total Contingency	$	91	$	90	$	—
Totals	$	8,500	$	8,100	$	7,182
(1) Construction costs are net of $1.1 billion we received from Toshiba Corporation under a Guarantee Settlement Agreement.

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General (Details)	3 Months Ended
	Mar. 31, 2022 member
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of electric distribution cooperative members	38

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Fair Value - Asset and liabilities measured at fair value on a recurring basis (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Fair value
Nuclear decommissioning trust fund	$ 615,247,000	$ 659,910,000
Long-term investments	702,821,000	711,379,000
International equity trust
Fair value
Unfunded commitments	$ 0
Redemption notice period	3 days
Recurring basis | Natural gas swaps
Fair value
Derivative liabilities	$ 173,946,000	63,994,000
Recurring basis | Domestic equity
Fair value
Nuclear decommissioning trust fund	237,403,000	249,999,000
Recurring basis | International equity trust
Fair value
Nuclear decommissioning trust fund	126,621,000	140,718,000
Long-term investments	36,959,000	35,873,000
Recurring basis | Corporate bonds and debt
Fair value
Nuclear decommissioning trust fund	47,987,000	72,936,000
Long-term investments	4,129,000	14,022,000
Recurring basis | US Treasury securities
Fair value
Nuclear decommissioning trust fund	102,406,000	53,321,000
Long-term investments	40,382,000	15,259,000
Recurring basis | Mortgage backed securities
Fair value
Nuclear decommissioning trust fund	22,192,000	40,460,000
Long-term investments	0	12,021,000
Recurring basis | Domestic mutual funds
Fair value
Nuclear decommissioning trust fund	68,348,000	75,384,000
Long-term investments	271,155,000	277,937,000
Recurring basis | Municipal bonds
Fair value
Nuclear decommissioning trust fund	809,000	1,133,000
Recurring basis | Federal agency securities
Fair value
Nuclear decommissioning trust fund	2,268,000	9,608,000
Long-term investments	0	257,000
Recurring basis | Treasury STRIPS
Fair value
Long-term investments	350,275,000	350,532,000
Recurring basis | Other
Fair value
Nuclear decommissioning trust fund	7,213,000	16,351,000
Long-term investments		5,478,000
Other liabilities	(79,000)
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Natural gas swaps
Fair value
Derivative liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic equity
Fair value
Nuclear decommissioning trust fund	237,403,000	249,999,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | International equity trust
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds and debt
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury securities
Fair value
Nuclear decommissioning trust fund	102,406,000	53,321,000
Long-term investments	40,382,000	15,259,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage backed securities
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic mutual funds
Fair value
Nuclear decommissioning trust fund	68,348,000	75,384,000
Long-term investments	271,155,000	277,937,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds
Fair value
Nuclear decommissioning trust fund	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency securities
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Treasury STRIPS
Fair value
Long-term investments	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Fair value
Nuclear decommissioning trust fund	7,213,000	13,623,000
Long-term investments		5,478,000
Other liabilities	(79,000)
Recurring basis | Significant Other Observable Inputs (Level 2) | Natural gas swaps
Fair value
Derivative liabilities	173,946,000	63,994,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Domestic equity
Fair value
Nuclear decommissioning trust fund	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | International equity trust
Fair value
Nuclear decommissioning trust fund	126,621,000	140,718,000
Long-term investments	36,959,000	35,873,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds and debt
Fair value
Nuclear decommissioning trust fund	46,718,000	72,369,000
Long-term investments	2,938,000	12,656,000
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury securities
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage backed securities
Fair value
Nuclear decommissioning trust fund	22,192,000	40,460,000
Long-term investments	0	12,021,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Domestic mutual funds
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds
Fair value
Nuclear decommissioning trust fund	809,000	1,133,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Federal agency securities
Fair value
Nuclear decommissioning trust fund	2,268,000	9,608,000
Long-term investments	0	257,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Treasury STRIPS
Fair value
Long-term investments	350,275,000	350,532,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Other
Fair value
Nuclear decommissioning trust fund	0	2,728,000
Long-term investments		0
Other liabilities	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Natural gas swaps
Fair value
Derivative liabilities	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Domestic equity
Fair value
Nuclear decommissioning trust fund	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | International equity trust
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate bonds and debt
Fair value
Nuclear decommissioning trust fund	1,269,000	567,000
Long-term investments	1,191,000	1,366,000
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury securities
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage backed securities
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Domestic mutual funds
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Municipal bonds
Fair value
Nuclear decommissioning trust fund	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Federal agency securities
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Treasury STRIPS
Fair value
Long-term investments	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Other
Fair value
Nuclear decommissioning trust fund	0	0
Long-term investments		$ 0
Other liabilities	$ 0

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Fair Value - Estimated fair value of long-term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Carrying Value
Fair Value
Long-term debt	$ 10,830,072	$ 10,915,054
Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value
Long-term debt	$ 11,338,418	$ 12,741,046

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Derivative Instruments - Gas hedges (Details) - Natural gas swaps $ in Thousands, MMBTU in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) MMBTU	Dec. 31, 2021 USD ($)
Derivative Instruments
Derivative asset | $	$ 173,946	$ 63,994
Credit collateral posted | $	$ 39,200	$ 1,800
Notional volume of natural gas derivatives (in MMBTUs)	111.8
2022
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	21.6
2023
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	26.8
2024
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	25.3
2025
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	21.2
2026
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	16.0
2027
Derivative Instruments
Notional volume of natural gas derivatives (in MMBTUs)	0.9

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Derivative Instruments - Fair value of derivative instruments not designated as hedging (Details) - Natural gas swaps - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Fair value of assets	$ 173,946	$ 63,994
Other current assets
Assets:
Fair value of assets	74,299	23,596
Other deferred charges
Assets:
Fair value of assets	99,647	40,398
Other current liabilities
Liabilities:
Fair value of liabilities	0	0
Other deferred credits
Liabilities:
Fair value of liabilities	$ 0	$ 0

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Derivative Instruments - Realized and unrealized gains and (losses) on derivative instruments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Gains and (losses) on derivative instruments
Net unrealized gains on derivative instruments	$ 173,946		$ 63,994
Natural gas swaps | Regulatory liability
Gains and (losses) on derivative instruments
Net unrealized gains on derivative instruments	173,946		$ 63,994
Natural gas swaps | Fuel
Gains and (losses) on derivative instruments
Gains	8,078	$ 101
Losses	(79)	(1,244)
Total	$ 7,999	$ (1,143)

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Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Cost
Equity	$ 310,055	$ 304,305
Debt	792,554	774,580
Other	7,134	19,102
Total	1,109,743	1,097,987
Gains
Equity	236,875	280,127
Debt	446	4,859
Other	0	0
Total	237,321	284,986
Losses
Equity	(4,239)	(4,682)
Debt	(24,757)	(7,001)
Other	0	(1)
Total	(28,996)	(11,684)
Fair Value
Equity	542,691	579,750
Debt	768,243	772,438
Other	7,134	19,101
Total	$ 1,318,068	$ 1,371,289

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Revenue Recognition (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) service member	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Revenue Recognition
Number of electric distribution cooperative members | member	38
Number of services provided | service	2
Member energy requirements supplied	57.00%	55.00%
Margins for interest ratio	1.10
Targeted margins for interest ratio	1.14
Refund liability	$ 0	$ 0
Operating revenues	420,442,000	376,331,000
Members
Revenue Recognition
Operating revenues	417,449,000	376,272,000
Receivables from contracts	137,121,000		$ 143,715,000
Non-Members
Revenue Recognition
Operating revenues	2,993,000	59,000
Receivables from contracts	2,095,000		$ 302,000
Capacity revenues | Members
Revenue Recognition
Operating revenues	243,291,000	255,824,000
Energy revenues | Members
Revenue Recognition
Operating revenues	174,158,000	120,448,000
Energy revenues | Non-Members
Revenue Recognition
Operating revenues	$ 2,993,000	$ 59,000

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Revenue Recognition - Management Program (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2018
Vogtle Units No. 3 & No. 4
Operating revenues
Amounts billed under rate management program	$ 3,861	$ 3,857
Cumulative recovery of financing costs	115,497
Vogtle New Units
Operating revenues
Cumulative recovery of financing costs	360,272
Rate management program, additional collection period			5 years
Rate management program, billing period			5 years
Amounts billed under additional rate management program	$ 2,944	$ 40,044

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Leases - Summary (Details)	3 Months Ended
	Mar. 31, 2022 option lease
Minimum
Leases
Finance lease renewal term	1 year
Maximum
Leases
Finance lease renewal term	5 years
Lease terms through December 31, 2027
Leases
Number of finance leases	3
Lease terms through June 30, 2031
Leases
Number of finance leases	1
Lease terms through February 2042
Leases
Number of renewal options | option	1
Operating lease, renewal term	20 years
Scherer Unit No. 2
Leases
Percentage of undivided interest in Scherer Unit No. 2	60.00%
Number of finance leases	4

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Leases - Balance Sheet Impact (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Right-of-Use Assets—Finance leases
Right-of-use assets	$ 302,732	$ 302,732
Less: Accumulated provision for depreciation	(268,923)	(267,606)
Total finance lease assets	33,809	35,126
Lease liabilities—Finance leases
Obligations under finance leases	61,335	61,335
Long-term debt and finance leases due within one year	7,541	7,541
Total finance lease liabilities	$ 68,876	$ 68,876
Finance Lease, Liability, Current, Statement of Financial Position	Long-term debt and finance leases due within one year	Long-term debt and finance leases due within one year
Right-of-Use Assets—Operating leases
Electric plant in service, net	$ 2,086	$ 2,293
Total operating lease assets	2,086	2,293
Lease liabilities—Operating leases
Capitalization—Other	1,301	1,550
Other current liabilities	798	838
Total operating lease liabilities	$ 2,099	$ 2,388
Operating Lease, Liability, Noncurrent, Statement of Financial Position	Obligation under Hydro Facility Transactions	Obligation under Hydro Facility Transactions
Operating Lease, Liability, Current, Statement of Financial Position	Other current liabilities	Other current liabilities

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Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Lease Cost
Amortization of leased assets	$ 1,885	$ 1,516
Interest on lease liabilities	1,852	2,044
Operating lease cost:	222	270
Total leased cost	$ 3,959	$ 3,830
Weighted-average remaining lease term (in years)
Finance leases	6 years 7 months 24 days		6 years 10 months 24 days
Operating leases	8 years 7 months 6 days		8 years 3 days
Weighted-average discount rate:
Finance leases	11.05%		11.05%
Operating leases	4.84%		4.73%

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Leases - Other Lease Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Lessee
Operating cash flows from operating leases	$ 303	$ 351
Right-of-use assets obtained in exchange for new operating lease liabilities	0	0
Finance Leases
2022	14,949
2023	14,949
2024	14,949
2025	14,949
2026	14,949
Thereafter	25,633
Total lease payments	100,378
Less: imputed interest	(31,502)
Total finance lease liabilities	68,876		$ 68,876
Operating Leases
2022	626
2023	708
2024	234
2025	72
2026	72
Thereafter	940
Total lease payments	2,652
Less: imputed interest	(553)
Total operating lease liabilities	2,099		$ 2,388
Total
2022	15,575
2023	15,657
2024	15,183
2025	15,021
2026	15,021
Thereafter	26,573
Total lease payments	103,030
Less: imputed interest	(32,055)
Present value of lease liabilities	70,975
Lessor
Lease income	$ 1,645	$ 1,597

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Contingencies and Regulatory Matters (Details)	3 Months Ended
	Mar. 31, 2022 plaintiff
Contingencies and Regulatory Matters
Number of plaintiffs	70

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Restricted Cash and Investments - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Oct. 01, 2021	Sep. 30, 2021
Restricted Investments Note [Abstract]
Guaranteed interest rate on deposit (as a percent)			0.09%	4.00%
Restricted investments	$ 196,820	$ 320,052
Restricted cash and short-term investments	$ 196,820	$ 246,350

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Restricted Cash and Investments - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Restricted Investments Note [Abstract]
Cash and cash equivalents	$ 467,353	$ 579,350	$ 561,101
Restricted cash included in Restricted cash and investments	39,200		0
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows	$ 506,553	$ 581,150	$ 561,101	$ 405,511

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Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 1,088,130	$ 1,008,790
Total Regulatory Liabilities	898,095	849,449
Net Regulatory Assets	190,035	159,341
Accumulated retirement costs for other obligations
Regulatory Assets and Liabilities
Total Regulatory Liabilities	22,371	22,197
Deferral of effects on net margin - Hawk Road Energy Facility | Hawk Road Energy Facility
Regulatory Assets and Liabilities
Total Regulatory Liabilities	17,098	17,253
Major maintenance reserve
Regulatory Assets and Liabilities
Total Regulatory Liabilities	81,492	73,059
Amortization of financing leases
Regulatory Assets and Liabilities
Total Regulatory Liabilities	7,732	8,457
Deferred debt service adder
Regulatory Assets and Liabilities
Total Regulatory Liabilities	142,817	138,897
Asset retirement obligations
Regulatory Assets and Liabilities
Total Regulatory Liabilities	97,746	164,256
Revenue deferral plan
Regulatory Assets and Liabilities
Total Regulatory Liabilities	$ 353,433	359,799
Amortization Period	5 years
Natural gas hedges
Regulatory Assets and Liabilities
Total Regulatory Liabilities	$ 173,946	63,994
Other regulatory liabilities
Regulatory Assets and Liabilities
Total Regulatory Liabilities	$ 1,460	1,537
Other regulatory liabilities | Maximum
Regulatory Assets and Liabilities
Amortization Period	5 years
Premium and loss on reacquired debt
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 32,199	33,200
Premium and loss on reacquired debt | Maximum
Regulatory Assets and Liabilities
Amortization period, other regulatory assets	22 years
Amortization of financing leases
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 33,611	34,179
Outage costs
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 45,834	31,956
Coal-fired maintenance outage costs | Maximum
Regulatory Assets and Liabilities
Amortization period, other regulatory assets	60 months
Nuclear refueling outage costs | Minimum
Regulatory Assets and Liabilities
Amortization period, other regulatory assets	18 months
Nuclear refueling outage costs | Maximum
Regulatory Assets and Liabilities
Amortization period, other regulatory assets	24 months
Asset retirement obligations | Ashpond and other
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 340,209	335,231
Depreciation expense | Plant Vogtle
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 36,617	36,973
Operating license expected extension period for Plant Vogtle	20 years
Operating license period	40 years
Depreciation expense | Plant Wansley
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 260,463	204,891
Deferred charges related to Vogtle Units No. 3 and No. 4 training costs | Vogtle Units No. 3 & No. 4
Regulatory Assets and Liabilities
Total Regulatory Assets	55,105	55,857
Interest rate options cost
Regulatory Assets and Liabilities
Total Regulatory Assets	132,756	131,556
Deferral of effects on net margin - Smith Energy Facility | Smith Energy Facility
Regulatory Assets and Liabilities
Total Regulatory Assets	141,189	142,675
Other regulatory assets
Regulatory Assets and Liabilities
Total Regulatory Assets	$ 10,147	$ 2,272
Other regulatory assets | Maximum
Regulatory Assets and Liabilities
Amortization period, other regulatory assets	28 years

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Debt - Department of Energy Loan Guarantee (Details)	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 22, 2019 USD ($)	Dec. 31, 2017 USD ($)	Feb. 20, 2014 USD ($) note
Debt
Repayments of long-term debt	$ 115,168,000	$ 61,828,000
Vogtle Units No. 3 & No. 4
Debt
Guarantee payment				$ 1,104,000,000
Loan Guarantee Agreement
Debt
Term of debt	5 years
Period of cessation of construction activities which would result in prepayment of outstanding principal	12 months
Period of failure to fund operation and maintenance expenses which would result in prepayment of outstanding principal	12 months
Long-term debt
Debt
Ownership interests voting required to continue construction (as a percent)	90.00%
Long-term debt | Department of Energy guarantee
Debt
Aggregate borrowings including capitalized interest	$ 4,107,348,382
Long-term debt | FFB
Debt
Number of future advance promissory notes | note					2
Maximum borrowing capacity			$ 1,619,679,706		$ 3,057,069,461
Capitalized interest					335,471,604
Maximum borrowing capacity designated for capitalized interest					$ 43,721,079
Eligible project costs, percent			70.00%
Repayments of long-term debt	217,685,000
Long-term debt | FFB | Department of Energy guarantee
Debt
Aggregate borrowings including capitalized interest	$ 1,094,000,000
Long-term debt | FFB | Department of Energy guarantee | Services Agreement
Debt
Guarantee payment			$ 4,676,749,167
Long-term debt | FFB | US Treasury Securities, Current Yield
Debt
Spread on variable rate (as a percent)	0.375%

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Debt - Rural Utilities Service Guaranteed Loans (Details) - Long-term debt - FFB - Rural Utilities Service Guaranteed Loans - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2022	Mar. 31, 2022
Debt
Advances received on loans		$ 30,185
Subsequent Event
Debt
Advances received on loans	$ 22,318

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Debt - First Mortgage Bonds (Details) - Subsequent Event $ in Thousands	Apr. 12, 2022 USD ($)
Debt
Repayments of commercial paper	$ 493,405
Mortgage Bonds | Series 2022A First Mortgage Bonds
Debt
Debt instrument, face amount	$ 500,000
Interest rate	4.50%

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Vogtle Units No. 3 and No. 4 Construction Project - Narrative (Details) $ in Millions		1 Months Ended	3 Months Ended
	Feb. 18, 2019 USD ($)	Nov. 30, 2021	Mar. 31, 2022 USD ($) unit MW	Dec. 31, 2021 USD ($)
Vogtle Units No. 3 & No. 4
Public Utility Property Plant and Equipment
Ownership interest (as a percent)			30.00%
Total investment in additional Vogtle units			$ 7,200
Monthly delay cost			75
Monthly delay cost, exercise of tender option			30
Additional construction contingency, construction productivity and field support			95
Ownership amount of additional construction contingency, construction productivity and field support			$ 29
Remaining share paid by counterparty upon exercise of tender option (as a percent)			100.00%
Budget increases since the nineteenth VCM				$ 3,400
Percentage of disallowed costs excluded from adverse event triggers			6.00%
Vogtle Units No. 3 & No. 4 | Jointly Owned Nuclear Power Plant
Public Utility Property Plant and Equipment
Project budget			$ 8,500
Total project cost			$ 8,100
Release of generating capacity with exercise of tender option (in megawatts) | MW			42
Proportionate ownership share with exercise of tender option (as a percent)			28.00%
Vogtle Units No. 3 & No. 4 | Financial Exposure Term One
Public Utility Property Plant and Equipment
Ownership interest (as a percent)			30.00%
Vogtle Units No. 3 & No. 4 | Financial Exposure Term Two
Public Utility Property Plant and Equipment
Ownership interest (as a percent)			30.00%
Vogtle Units No. 3 & No. 4 | Minimum
Public Utility Property Plant and Equipment
COVID related costs			$ 350
Ownership amount of COVID related costs			105
Vogtle Units No. 3 & No. 4 | Maximum
Public Utility Property Plant and Equipment
COVID related costs			438
Ownership amount of COVID related costs			$ 131
Vogtle Units No. 3 & No. 4 | Ownership participation agreement
Public Utility Property Plant and Equipment
Ownership interest (as a percent)			30.00%
Ownership share, generating capacity (in megawatts) | MW			660
Project budget			$ 8,500
Vogtle Units No. 3 & No. 4 | EPC Agreement | Westinghouse Electric Company LLC and Stone & Webster, Inc.
Public Utility Property Plant and Equipment
Number of nuclear units | unit			2
Generating capacity of each nuclear unit (in megawatts) | MW			1,100
Vogtle Units No. 3 & No. 4 | Services Agreement | Westinghouse Electric Company LLC and Stone & Webster, Inc.
Public Utility Property Plant and Equipment
Written notice period for termination of agreement			30 days
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet
Public Utility Property Plant and Equipment
Project budget	$ 8,400
Total project cost			$ 17,100
Additional construction costs	$ 800
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Financial Exposure Term One
Public Utility Property Plant and Equipment
Proportionate share of construction costs, co-owner (as a percent)	55.70%
Additional construction costs, responsibility of co-owner	$ 80
Proportionate share of additional construction costs	$ 44
Proportionate share of construction costs, remaining co-owners (as a percent)	44.30%
Proportionate share of construction costs (as a percent)	24.50%
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Financial Exposure Term Two
Public Utility Property Plant and Equipment
Proportionate share of construction costs, co-owner (as a percent)	65.70%
Additional construction costs, responsibility of co-owner	$ 100
Proportionate share of additional construction costs	$ 55
Proportionate share of construction costs, remaining co-owners (as a percent)	34.30%
Proportionate share of construction costs (as a percent)	19.00%
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Financial Exposure Term Three
Public Utility Property Plant and Equipment
Additional construction costs triggering option to tender ownership	$ 2,100
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Minimum
Public Utility Property Plant and Equipment
Ownership approval to change primary construction contractor (as a percent)			90.00%
Exercise period of tender option		120 days
Ownership approval required to continue construction (as a percent)			90.00%
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Minimum | Financial Exposure Term One
Public Utility Property Plant and Equipment
Additional construction costs	800
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Minimum | Financial Exposure Term Two
Public Utility Property Plant and Equipment
Additional construction costs	1,600
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Minimum | Financial Exposure Term Three
Public Utility Property Plant and Equipment
Additional construction costs triggering option to tender ownership	800
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Maximum
Public Utility Property Plant and Equipment
Exercise period of tender option		180 days
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Maximum | Financial Exposure Term One
Public Utility Property Plant and Equipment
Additional construction costs	1,600
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Maximum | Financial Exposure Term Two
Public Utility Property Plant and Equipment
Additional construction costs	2,100
Vogtle Units No. 3 & No. 4 | Global Amendments To Term Sheet | Maximum | Financial Exposure Term Three
Public Utility Property Plant and Equipment
Additional construction costs triggering option to tender ownership	$ 2,100
Vogtle Unit Number 4
Public Utility Property Plant and Equipment
Monthly delay cost			$ 30
Monthly delay cost, exercise of tender option			$ 12

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Vogtle Units No. 3 and No. 4 Construction Project - Project Budget and Actual Costs (Details) - Vogtle Units No. 3 & No. 4 $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Actual Costs at March 31, 2022
Proceeds from guarantee agreement	$ 1,100
Jointly Owned Nuclear Power Plant
Project Budget - No Tender
Construction Costs	6,487
Financing Costs	1,922
Total Costs	8,409
Project-Level Contingency	70
Oglethorpe-Level Contingency	21
Total Contingency	91
Totals	8,500
Project Budget - Tender
Construction Costs	6,096
Financing Costs	1,914
Total Costs	8,010
Project-Level Contingency	70
Oglethorpe-Level Contingency	20
Total Contingency	90
Totals	8,100
Actual Costs at March 31, 2022
Construction Costs	5,621
Financing Costs	1,561
Total Costs	7,182
Project-Level Contingency	0
Oglethorpe-Level Contingency	0
Total Contingency	0
Totals	$ 7,182