XML 51 R34.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Regulatory Assets and Liabilities | The following table presents a summary of OG&E's regulatory assets and liabilities.
December 31 (In millions) |  | 2024 |  |  | 2023 |
REGULATORY ASSETS |  |  |  |  |  |
Current: |  |  |  |  |  |
Oklahoma fuel clause under recoveries |  | $ | 112.7 |  |  | $ | — |
Oklahoma Energy Efficiency Rider under recoveries (A) |  |  | 7.0 |  |  |  | 3.8 |
Other (A) |  |  | 3.8 |  |  |  | 2.7 |
Total current regulatory assets |  | $ | 123.5 |  |  | $ | 6.5 |
Non-current: |  |  |  |  |  |
Oklahoma deferred storm expenses |  | $ | 244.3 |  |  | $ | 261.1 |
Pension tracker |  |  | 94.7 |  |  |  | 91.9 |
Benefit obligations regulatory asset |  |  | 90.8 |  |  |  | 89.4 |
Arkansas Winter Storm Uri costs |  |  | 63.0 |  |  |  | 71.0 |
Sooner Dry Scrubbers |  |  | 16.4 |  |  |  | 17.2 |
Oklahoma SAP S/4 HANA deferred expenses |  |  | 14.3 |  |  |  | 6.0 |
Arkansas deferred pension expenses |  |  | 11.0 |  |  |  | 12.7 |
Oklahoma vegetation management program deferred costs |  |  | 6.4 |  |  |  | — |
Unamortized loss on reacquired debt |  |  | 6.3 |  |  |  | 7.2 |
COVID-19 impacts |  |  | 5.4 |  |  |  | 6.8 |
Arkansas capacity power purchase agreements |  |  | 3.5 |  |  |  | 0.6 |
Other |  |  | 12.0 |  |  |  | 13.7 |
Total non-current regulatory assets |  | $ | 568.1 |  |  | $ | 577.6 |
REGULATORY LIABILITIES |  |  |  |  |  |
Current: |  |  |  |  |  |
Arkansas fuel clause over recoveries |  | $ | 9.3 |  |  | $ | 4.9 |
Oklahoma Investment Tax Credit over recoveries (B) |  |  | 6.1 |  |  |  | — |
SPP cost tracker over recoveries (B) |  |  | 4.1 |  |  |  | 10.4 |
Oklahoma fuel clause over recoveries |  |  | — |  |  |  | 15.6 |
Other (B) |  |  | 0.8 |  |  |  | 2.3 |
Total current regulatory liabilities |  | $ | 20.3 |  |  | $ | 33.2 |
Non-current: |  |  |  |  |  |
Income taxes refundable to customers, net |  | $ | 780.8 |  |  | $ | 838.0 |
Accrued removal obligations, net |  |  | 231.9 |  |  |  | 222.0 |
Other |  |  | 3.7 |  |  |  | 1.6 |
Total non-current regulatory liabilities |  | $ | 1,016.4 |  |  | $ | 1,061.6 |
(A) Included in Other Current Assets in the balance sheets. Included in Other Current Liabilities in the balance sheets.
Summary of Components of Benefit Obligation | The following table presents a summary of the components of the benefit obligations regulatory asset.
December 31 (In millions) |  | 2024 |  |  | 2023 |
Pension Plan and Restoration of Retirement Income Plan: |  |  |  |  |  |
Net loss |  | $ | 76.5 |  |  | $ | 75.9 |
Postretirement Benefit Plans: |  |  |  |  |  |
Net loss |  |  | 14.3 |  |  |  | 13.5 |
Total |  | $ | 90.8 |  |  | $ | 89.4 |
Schedule of Jointly Owned Utility Plants | The following tables present OG&E's ownership interest in the jointly-owned McClain Plant and the jointly-owned Redbud Plant, and, as disclosed below, only OG&E's ownership interest is reflected in the property, plant and equipment and accumulated depreciation balances in these tables. The owners of the remaining interests in the McClain Plant and the Redbud Plant are responsible for providing their own financing of capital expenditures. Also, only OG&E's proportionate interests of any direct expenses of the McClain Plant and the Redbud Plant, such as fuel, maintenance expense and other operating expenses, are included in the applicable financial statement captions in the statements of income.
December 31, 2024 (In millions) |  | Percentage Ownership |  |  | Total Property, Plant and Equipment |  |  | Accumulated Depreciation |  |  | Net Property, Plant and Equipment |
McClain Plant (A) |  |  | 77 | % |  | $ | 244.4 |  |  | $ | 75.8 |  |  | $ | 168.6 |
Redbud Plant (A)(B) |  |  | 51 | % |  | $ | 556.7 |  |  | $ | 247.7 |  |  | $ | 309.0 |
(A) Construction work in progress was $0.8 million and $5.1 million for the McClain and Redbud Plants, respectively. (B) This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $89.3 million.
December 31, 2023 (In millions) |  | Percentage Ownership |  |  | Total Property, Plant and Equipment |  |  | Accumulated Depreciation |  |  | Net Property, Plant and Equipment |
McClain Plant (A) |  |  | 77 | % |  | $ | 265.4 |  |  | $ | 129.2 |  |  | $ | 136.2 |
Redbud Plant (A)(B) |  |  | 51 | % |  | $ | 548.9 |  |  | $ | 245.5 |  |  | $ | 303.4 |
(A) Construction work in progress was $0.3 million and $2.0 million for the McClain and Redbud Plants, respectively. (B) This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million.
Summary of Property Plant and Equipment | The following tables present the Registrants' major classes of property, plant and equipment and related accumulated depreciation.
December 31, 2024 (In millions) |  | Total Property, Plant and Equipment |  |  | Accumulated Depreciation |  |  | Net Property, Plant and Equipment |
OG&E: |  |  |  |  |  |  |  |  |
Distribution assets |  | $ | 6,654.5 |  |  | $ | 1,639.8 |  |  | $ | 5,014.7 |
Electric generation assets (A) |  |  | 5,518.5 |  |  |  | 2,145.9 |  |  |  | 3,372.6 |
Transmission assets (B) |  |  | 3,432.1 |  |  |  | 748.5 |  |  |  | 2,683.6 |
Intangible plant |  |  | 752.3 |  |  |  | 203.7 |  |  |  | 548.6 |
Other property and equipment |  |  | 705.3 |  |  |  | 244.3 |  |  |  | 461.0 |
OG&E property, plant and equipment |  |  | 17,062.7 |  |  |  | 4,982.2 |  |  |  | 12,080.5 |
Non-OG&E property, plant and equipment |  |  | 6.1 |  |  |  | — |  |  |  | 6.1 |
Total OGE Energy property, plant and equipment |  | $ | 17,068.8 |  |  | $ | 4,982.2 |  |  | $ | 12,086.6 |
(A) This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $89.3 million. (B) This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.2 million.
December 31, 2023 (In millions) |  | Total Property, Plant and Equipment |  |  | Accumulated Depreciation |  |  | Net Property, Plant and Equipment |
OG&E: |  |  |  |  |  |  |  |  |
Distribution assets |  | $ | 6,290.1 |  |  | $ | 1,564.3 |  |  | $ | 4,725.8 |
Electric generation assets (A) |  |  | 5,295.9 |  |  |  | 2,081.0 |  |  |  | 3,214.9 |
Transmission assets (B) |  |  | 3,306.7 |  |  |  | 707.6 |  |  |  | 2,599.1 |
Intangible plant |  |  | 568.5 |  |  |  | 219.8 |  |  |  | 348.7 |
Other property and equipment |  |  | 643.1 |  |  |  | 236.7 |  |  |  | 406.4 |
OG&E property, plant and equipment |  |  | 16,104.3 |  |  |  | 4,809.4 |  |  |  | 11,294.9 |
Non-OG&E property, plant and equipment |  |  | 6.1 |  |  |  | — |  |  |  | 6.1 |
Total OGE Energy property, plant and equipment |  | $ | 16,110.4 |  |  | $ | 4,809.4 |  |  | $ | 11,301.0 |
(A) This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $83.8 million. (B) This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.1 million.
Schedule of Change in Asset Retirement Obligation | The following table presents changes to OG&E's asset retirement obligations during the years ended December 31, 2024 and 2023.
(In millions) |  | 2024 |  |  | 2023 |
Balance at January 1 |  | $ | 81.3 |  |  | $ | 78.3 |
Accretion expense |  |  | 0.9 |  |  |  | 0.7 |
Liabilities settled (A) |  |  | (0.2 | ) |  |  | — |
Revisions in estimated cash flows (B) |  |  | 2.6 |  |  |  | 2.3 |
Balance at December 31 |  | $ | 84.6 |  |  | $ | 81.3 |
(A) Asset retirement obligations were settled for asbestos removal at OG&E's generating facilities. (B) Assumptions changed due to new removal estimates related to asbestos abatement at two of OG&E's generating facilities in 2023, and wind turbine removal at three of OG&E's wind farms in 2024.
Summary of Accumulated Other Comprehensive Income (Loss) (Details) | The following table presents changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during 2024 and 2023. All amounts below are presented net of tax.
| Pension Plan and Restoration of Retirement Income Plan |  | Postretirement Benefit Plans |  |  |
(In millions) | Net Gain (Loss) |  | Prior Service Cost (Credit) |  | Net Gain (Loss) |  | Total |
Balance at December 31, 2022 | $ | (17.5 | ) | $ | (1.0 | ) | $ | 6.6 |  | $ | (11.9 | )
Other comprehensive income (loss) before reclassifications |  | 3.3 |  |  | — |  |  | (0.8 | ) |  | 2.5 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.9 |  |  | 0.2 |  |  | (0.1 | ) |  | 1.0 |
Settlement cost |  | 1.2 |  |  | — |  |  | — |  |  | 1.2 |
Net current period other comprehensive income (loss) |  | 5.4 |  |  | 0.2 |  |  | (0.9 | ) |  | 4.7 |
Balance at December 31, 2023 |  | (12.1 | ) |  | (0.8 | ) |  | 5.7 |  |  | (7.2 | )
Other comprehensive income (loss) before reclassifications |  | (0.2 | ) |  | — |  |  | 0.5 |  |  | 0.3 |
Amounts reclassified from accumulated other comprehensive income (loss) |  | 0.2 |  |  | 0.2 |  |  | (0.1 | ) |  | 0.3 |
Regulatory classification of certain pension costs |  | 3.9 |  |  | — |  |  | — |  |  | 3.9 |
Net current period other comprehensive income (loss) |  | 3.9 |  |  | 0.2 |  |  | 0.4 |  |  | 4.5 |
Balance at December 31, 2024 | $ | (8.2 | ) | $ | (0.6 | ) | $ | 6.1 |  | $ | (2.7 | )
Reclassified Out of Accumulated Other Comprehensive Income (Loss) | The following table presents significant amounts reclassified out of accumulated other comprehensive income (loss) attributable to OGE Energy by the respective line items in net income during the years ended December 31, 2024 and 2023.
Details about Accumulated Other Comprehensive Income (Loss) Components | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in OGE Energy's Statements of Income
| Year Ended December 31, |  |
(In millions) | 2024 |  |  | 2023 |  |
Amortization of Pension Plan and Restoration of Retirement Income Plan items: |  |  |  |  |  |
Actuarial losses | $ | (0.3 | ) |  | $ | (1.1 | ) | (A)
Prior service cost |  | (0.3 | ) |  |  | (0.3 | ) | (A)
Settlement cost |  | — |  |  |  | (1.6 | ) | (A)
|  | (0.6 | ) |  |  | (3.0 | ) | Income Before Taxes
|  | (0.2 | ) |  |  | (0.7 | ) | Income Tax Expense
| $ | (0.4 | ) |  | $ | (2.3 | ) | Net Income
Amortization of postretirement benefit plans items: |  |  |  |  |  |
Actuarial gains | $ | 0.2 |  |  | $ | 0.2 |  | (A)
|  | 0.2 |  |  |  | 0.2 |  | Income Before Taxes
|  | 0.1 |  |  |  | 0.1 |  | Income Tax Expense
| $ | 0.1 |  |  | $ | 0.1 |  | Net Income
Total reclassifications for the period, net of tax | $ | (0.3 | ) |  | $ | (2.2 | ) | Net Income
(A) These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

X
- Definition Components of Benefit Obligation Regulatory Asset [Table Text Block] + References No definition available. + Details
Name: | oge_ComponentsOfBenefitObligationRegulatoryAssetTableTextBlock
Namespace Prefix: | oge_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition A table of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs and recognition of certain revenues that are included in rate-setting to the balance sheet. + References No definition available. + Details
Name: | oge_ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | oge_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
Name: | us-gaap_ScheduleOfJointlyOwnedUtilityPlantsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration