SIGNIFICANT ACCOUNTING POLICIES

General

Questar Gas makes certain estimates and assumptions in preparing its Financial Statements in accordance with GAAP. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues, expenses and cash flows for the periods presented. Actual results may differ from those estimates.

Questar Gas reports certain contracts and instruments at fair value. See Note 5 for further information on fair value measurements.

Certain amounts in the 2015 and 2014 Financial Statements and footnotes have been reclassified to conform to the 2016 presentation for comparative purposes. The reclassifications did not affect Questar Gas' net income, total assets, liabilities, equity or cash flows, except for the reclassification of debt issuance costs.

Operating Revenue

Operating revenue is recorded on the basis of services rendered, commodities delivered or contracts settled and includes amounts yet to be billed to customers. Questar Gas collects sales taxes; however, these amounts are excluded from revenue. Questar Gas’ customer receivables at December 31, 2016 and 2015 included $88.6 million and $91.0 million, respectively, of accrued unbilled revenue based on estimated amounts of natural gas delivered but not yet billed to its customers.

The primary types of sales and service activities reported as operating revenue for Questar Gas are as follows:


•	Regulated gas sales consist of delivery of natural gas to residential, commercial and industrial customers;


•	Gas transportation consists of transportation of gas for industrial customers who buy their own gas supply; and


•	Other primarily consists of connection fees, royalties, miscellaneous product sales, etc.

Cost of Sales

Questar Gas obtains the majority of its gas supply from Wexpro's cost-of-service production and pays Wexpro an operator service fee based on the terms of the Wexpro Agreement and the Wexpro II Agreement. Questar Gas also obtains transportation and storage services from Questar Pipeline. See Note 18 for more information. During the second and third quarters of the year, a significant portion of the natural gas from Wexpro production is injected into underground storage. This gas is withdrawn from storage as needed during the heating season in the first and fourth quarters. The cost of natural gas sold is credited with the value of natural gas as it is injected into storage and debited as it is withdrawn from storage.

The details of Questar Gas' cost of sales are as follows:



Year Ended December 31,	2016			2015			2014
(millions)
Gas purchases	$	102.0		$	82.5		$	136.5
Affiliated operator service fee	311.7			319.0			349.7
Transportation and storage⁽¹⁾	79.3			79.2			79.6
Gathering	23.7			22.1			21.0
Royalties	26.3			33.3			60.1
Storage (injection), net	(5.5		)	(3.5		)	(1.1		)
Purchased-gas account adjustment	(0.6		)	20.5			(45.8		)
Other	5.2			5.0			4.8
Total cost of sales	$	542.1		$	558.1		$	604.8

(1) See Note 18 for amounts attributable to related parties.

Purchased Gas-Deferred Costs

Where permitted by regulatory authorities, the differences between Questar Gas’ purchased gas expenses and the related levels of recovery for these expenses in current rates are deferred and matched against recoveries in future periods. The deferral of gas costs in excess of current period recovery is recognized as a regulatory asset, while rate recovery in excess of current period gas costs is recognized as a regulatory liability.

Virtually all of Questar Gas' natural gas purchases are either subject to deferral accounting or are recovered from the customer in the same accounting period as the sale.

Income Taxes

For 2016, a consolidated federal income tax return will be filed for Dominion Questar, including Questar Gas, for the period January 1, 2016 through September 16, 2016. Questar Gas will also be part of the consolidated federal income tax return filed by Dominion for the period September 17, 2016 through December 31, 2016. Questar Gas will be part of the consolidated Dominion federal income tax return for the full year 2017 and going forward. In addition, where applicable, combined income tax returns for Dominion and its subsidiaries are filed in various states; otherwise, separate state income tax returns are filed.

Questar Gas participates in intercompany tax sharing agreements with Dominion and its subsidiaries. Current income taxes are based on taxable income or loss and credits determined on a separate company basis.

Under the agreements, if a subsidiary incurs a tax loss or earns a credit, recognition of current income tax benefits is limited to refunds of prior year taxes obtained by the carryback of the net operating loss or credit or to the extent the tax loss or credit is absorbed by the taxable income of other Dominion consolidated group members. Otherwise, the net operating loss or credit is carried forward and is recognized as a deferred tax asset until realized.

Accounting for income taxes involves an asset and liability approach. Deferred income tax assets and liabilities are provided, representing future effects on income taxes for temporary differences between the bases of assets and liabilities for financial reporting and tax purposes. Accordingly, deferred taxes are recognized for the future consequences of different treatments used for the reporting of transactions in financial accounting and income tax returns. Questar Gas establishes a valuation allowance when it is more-likely-than-not that all, or a portion, of a deferred tax asset will not be realized. A regulatory asset is recognized if it is probable that future revenues will be provided for the payment of deferred tax liabilities.

Questar Gas recognizes positions taken, or expected to be taken, in income tax returns that are more-likely-than-not to be realized, assuming that the position will be examined by tax authorities with full knowledge of all relevant information.

If it is not more-likely-than-not that a tax position, or some portion thereof, will be sustained, the related tax benefits are not recognized in the financial statements. Unrecognized tax benefits may result in an increase in income taxes payable, a reduction of income tax refunds receivable or changes in deferred taxes. Also, when uncertainty about the deductibility of an amount is limited to the timing of such deductibility, the increase in income taxes payable (or reduction in tax refunds receivable) is accompanied by a decrease in deferred tax liabilities. Except when such amounts are presented net with amounts receivable from or amounts prepaid to tax authorities, noncurrent income taxes payable related to unrecognized tax benefits are classified in other deferred credits and other liabilities in the Balance Sheets and current payables are included in accounts payable and accrued expenses in the Balance Sheets.

Questar Gas recognizes interest on underpayments and overpayments of income taxes in interest expense and other income, respectively. Penalties are also recognized in other income.

Questar Gas' interest and penalties were immaterial in 2016, 2015 and 2014.

At December 31, 2016, Questar Gas' Balance Sheet included $1.4 million of federal income taxes payable and $1.7 million of state income taxes payable.

At December 31, 2015, Questar Gas' Balance Sheet included $34.2 million of affiliated receivables, representing current year excess federal income tax payments expected to be refunded, and $1.1 million of state income taxes payable. In April 2016, Questar Gas received a $35.0 million refund of its 2015 income tax payments.

Investment tax credits are deferred and amortized over the service lives of the properties giving rise to the credits.

Cash and Cash Equivalents

Current banking arrangements generally do not require checks to be funded until they are presented for payment. At December 31, 2016 and 2015, accounts payable and accrued expenses included $7.7 million and $4.0 million, respectively, of check outstanding but not yet presented for payment. For purposes of the Statements of Cash Flows, cash and cash equivalents include cash on hand, cash in banks and temporary investments purchased with an original maturity of three months or less.

Derivative Instruments

Questar Gas uses derivative instruments such as physical forwards and options to manage the commodity risk of its business operations. All derivatives, except those for which an exception applies, are required to be reported in the Balance Sheets at fair value. Derivative contracts representing unrealized gain positions and purchased options are reported as derivative assets. Derivative contracts representing unrealized losses and options sold are reported as derivative liabilities. One of the exceptions to fair value accounting, normal purchases and normal sales, may be elected when the contract satisfies certain criteria, including a requirement that physical delivery of the underlying commodity is probable. Expenses and revenues resulting from deliveries under normal purchase contracts and normal sales contracts, respectively, are included in earnings at the time of contract performance.

Questar Gas does not offset amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. See Note 6 for further information about derivatives.

Changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities. Realized gains or losses on the derivative instruments are generally recognized when the related transactions impact earnings.

Property, Plant and Equipment

Property, plant and equipment is recorded at lower of original cost or fair value, if impaired. Capitalized costs include labor, materials and other direct and indirect costs such as asset retirement costs, AFUDC and overhead costs. The cost of repairs and maintenance, including minor additions and replacements, is generally charged to expense as it is incurred.

In 2016, 2015 and 2014, Questar Gas capitalized AFUDC to property, plant and equipment of $0.4 million, $0.1 million and $1.4 million, respectively.

The undepreciated cost of property, less salvage value, is generally charged to accumulated depreciation at retirement. Cost of removal collections from utility customers not representing AROs are recorded as regulatory liabilities. For property subject to cost-of-service rate regulation that will be abandoned significantly before the end of its useful life, the net carrying value is reclassified from plant-in-service when it becomes probable it will be abandoned.

Depreciation of property, plant and equipment is computed on the straight-line method based on projected service lives. Questar Gas' average composite depreciation rates on utility property, plant and equipment are as follows:



Year Ended December 31,	2016	2015	2014
(percent)
Distribution	2.42	2.60	2.71
General and other	3.79	3.49	4.29

Long-Lived and Intangible Assets

Questar Gas performs an evaluation for impairment whenever events or changes in circumstances indicate that the carrying amount of long-lived assets or intangible assets with finite lives may not be recoverable. A long-lived or intangible asset is written down to fair value if the sum of its expected future undiscounted cash flows is less than its carrying amount. Intangible assets with finite lives are amortized over their estimated useful lives.

Regulatory Assets and Liabilities

The accounting for Questar Gas' operations differs from the accounting for nonregulated operations in that it is required to reflect the effect of rate regulation in its Financial Statements. For regulated businesses subject to state cost-of-service rate regulation, regulatory practices that assign costs to accounting periods may differ from accounting methods generally applied by nonregulated companies. When it is probable that regulators will permit the recovery of current costs through future rates charged to customers, these costs that otherwise would be expensed by nonregulated companies are deferred as regulatory assets. Likewise, regulatory liabilities are recognized when it is probable that regulators will require customer refunds through future rates or when revenue is collected from customers for expenditures that have yet to be incurred. Generally, regulatory assets and liabilities are amortized into income over the period authorized by the regulator.

Questar Gas evaluates whether or not recovery of its regulatory assets through future rates is probable and makes various assumptions in its analyses. The expectations of future recovery are generally based on orders issued by regulatory commissions, legislation or historical experience, as well as discussions with applicable regulatory authorities and legal counsel. If recovery of a regulatory asset is determined to be less than probable, it will be written off in the period such assessment is made.

Asset Retirement Obligations

Questar Gas recognizes AROs at fair value as incurred or when sufficient information becomes available to determine a reasonable estimate of the fair value of future retirement activities to be performed for which a legal obligation exists. These amounts are generally capitalized as costs of the related tangible long-lived assets. Since relevant market information is not available, fair value is estimated using discounted cash flow analyses. Periodically, Questar Gas evaluates the key assumptions underlying its AROs including estimates of the amounts and timing of future cash flows associated with retirement activities. AROs are adjusted when significant changes in these assumptions are identified. Questar Gas reports accretion of AROs and depreciation on asset retirement costs associated with its natural gas pipeline assets as an adjustment to the related regulatory liabilities when revenue is recoverable from customers for AROs.

Debt Issuance Costs

Questar Gas defers and amortizes debt issuance costs and debt premiums or discounts over the expected lives of the respective debt issues, considering maturity dates and, if applicable, redemption rights held by others. Effective January 2016, deferred debt issuance costs are recorded as a reduction in long-term debt in the Balance Sheets. Such costs had previously been recorded as an asset in other noncurrent assets in the Balance Sheets. Amortization of the issuance costs is reported as interest expense. Unamortized costs associated with redemptions of debt securities prior to stated maturity dates are generally recognized and recorded in interest expense immediately. As permitted by regulatory authorities, gains or losses resulting from the refinancing of debt allocable to utility operations subject to cost-based rate regulation are deferred and amortized over the lives of the new issuances.

Inventories

Materials and supplies inventories are valued primarily using the weighted-average cost method. Stored gas inventory for Questar Gas used in gas distribution operations is valued using the weighted-average cost method.

Goodwill

Questar Gas evaluates goodwill for impairment annually as of December 31 through 2016 (as of April 1 effective 2017) and whenever an event occurs or circumstances change in the interim that would more-likely-than-not reduce the fair value of a reporting unit below its carrying amount.

New Accounting Standards

In May 2014, the FASB issued revised accounting guidance for revenue recognition from contracts with customers. The core principle of this revised accounting guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments in this update also require disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers.

For Questar Gas, the revised accounting guidance is effective for interim and annual periods beginning January 1, 2018. We have completed the preliminary stages of evaluating the impact of this guidance and, pending evaluation of the items discussed below, expect no significant impact on our results of operations. Now that our preliminary evaluation is complete, we will expand the scope of our assessment to include all contracts with customers. In addition, we are considering certain issues that could potentially change the accounting for certain transactions. Among the issues being considered are accounting for contributions in aid of construction, recognition of revenue when collectability is in question, recognition of revenue in contracts with variable consideration and accounting for alternative revenue programs. Questar Gas plans on applying the standard using the modified retrospective method as opposed to the full retrospective method.