Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Significant Accounting Policies [Text Block]

Summary of Significant Accounting Policies

OG&E's significant accounting policies are detailed in "Note 1. Summary of Significant Accounting Policies" in OG&E's 2018 Form 10-K. Changes to OG&E's accounting policies as a result of adopting ASU 2016-02, "Leases (Topic 842)," and the related ASU 2018-01 and ASU 2018-11 are discussed in Notes 2 and 4 in this Form 10-Q.

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

Organization

OG&Egenerates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas. Its operationsare subject to regulation by the OCC, the APSC and the FERC. OG&E was incorporated in 1902 under the laws of the Oklahoma Territory. OG&E is the largest electric utility in Oklahoma, and its franchised service territory includes Fort Smith, Arkansas and the surrounding communities. OG&E sold its retail natural gas business in 1928 and is no longer engaged in the natural gas distribution business.OG&E is a wholly-owned subsidiary of OGE Energy, a holding company with investments in energy and energy services providers offering physical delivery and related services for both electricity and natural gas primarily in the south central U.S.

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

Basis of Presentation

The CondensedFinancial Statements included herein have been prepared by OG&E, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations; however, OG&E believes that the disclosures are adequate to prevent the information presented from being misleading.

In the opinion of management, all adjustments necessary to fairly present thefinancial position of OG&E atMarch 31, 2019andDecember 31, 2018, the results of its operations for the three months endedMarch 31, 2019and2018 and its cash flows for thethree months endedMarch 31, 2019 and 2018have been included and are of a normal, recurring nature except as otherwise disclosed. Management also has evaluated the impact of events occurring afterMarch 31, 2019up to the date of issuance of these Condensed Financial Statements, and these statements contain all necessary adjustments and disclosures resulting from that evaluation.

Due to seasonal fluctuations and other factors, OG&E'soperating results for thethree months endedMarch 31, 2019are not necessarily indicative of the results that may be expected for the year endingDecember 31, 2019or for any future period.The CondensedFinancial Statements and Notes thereto should be read in conjunction with the auditedFinancial Statements and Notes thereto included in OG&E's 2018Form 10-K.

Schedule of Regulatory Assets and Liabilities [Text Block]

Accounting Records

The accounting records of OG&E are maintained in accordance with the Uniform System of Accounts prescribed by the FERC and adopted by the OCC and the APSC. Additionally, OG&E, as a regulated utility, is subject to accounting principles for certain types of rate-regulated activities, which provide that certain incurred costs that would otherwise be charged to expense can be deferred as regulatory assets, based on the expected recovery from customers in future rates. Likewise, certain actual or anticipated credits that would otherwise reduce expense can be deferred as regulatory liabilities, based on the expected flowback to customers in future rates. Management's expected recovery of deferred costs and flowback of deferred credits generally results from specific decisions by regulators granting such ratemaking treatment.

OG&E records certain incurred costs and obligations as regulatory assets or liabilities if, based on regulatory orders or other available evidence, it is probable that the costs or obligations will be included in amounts allowable for recovery or refund in future rates.

The following table is a summary of OG&E's regulatory assets and liabilities.

	March 31,		December 31,
(In millions)	2019		2018
REGULATORY ASSETS
Current:
Fuel clause under recoveries	$	24.5	$	2.0
Cogeneration credit rider over credit (A)	7.6		—
Production tax credit rider over credit (A)	6.6		6.9
Oklahoma demand program rider under recovery (A)	—		6.4
Other (A)	2.2		3.2
Total current regulatory assets	$	40.9	$	18.5
Non-current:
Benefit obligations regulatory asset	$	175.2	$	188.2
Deferred storm expenses	33.4		36.5
Smart Grid	23.8		25.6
Sooner Dry Scrubbers	12.5		4.5
Unamortized loss on reacquired debt	11.2		11.4
Arkansas deferred pension expenses	7.8		6.8
Other	12.6		12.8
Total non-current regulatory assets	$	276.5	$	285.8
REGULATORY LIABILITIES
Current:
Reserve for tax refund (B)	$	15.8	$	15.4
SPP cost tracker over recovery (B)	12.1		16.8
Oklahoma demand program rider over recovery (B)	3.3		—
Transmission cost recovery rider over recovery (B)	2.0		2.7
Fuel clause over recoveries	—		0.3
Other (B)	2.0		1.4
Total current regulatory liabilities	$	35.2	$	36.6
Non-current:
Income taxes refundable to customers, net	$	929.3	$	937.1
Accrued removal obligations, net	313.6		308.1
Pension tracker	4.9		18.7
Other	6.5		6.8
Total non-current regulatory liabilities	$	1,254.3	$	1,270.7

(A) Included in Other Current Assets in theCondensedBalance Sheets.

(B) Included in Other Current Liabilities in theCondensedBalance Sheets.

Management continuously monitors the future recoverability of regulatory assets.When in management's judgment future recovery becomes impaired, the amount of the regulatory asset is adjusted, as appropriate.If OG&E were required to discontinue the application of accounting principles for certain types of rate-regulated activities for some or all of its operations, it could result in writing off the related regulatory assets or liabilities, which could have significant financial effects.

Reclassifications [Text Block]

Reclassifications

Certain prior year amounts have been reclassified to conform to the current year presentation.