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v3.6.0.2

Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current Federal Tax Expense (Benefit) |  | $ 0.0 | $ 0.0 | $ 0.0 |
Current State and Local Tax Expense (Benefit) |  | (5.7) | (5.2) | (4.5) |
Current Income Tax Expense (Benefit) |  | (5.7) | (5.2) | (4.5) |
Deferred Federal Income Tax Expense (Benefit) |  | 126.0 | 98.8 | 160.0 |
Deferred State and Local Income Tax Expense (Benefit) |  | 28.0 | 4.5 | 18.2 |
Deferred Income Tax Expense (Benefit) |  | 154.0 | 103.3 | 178.2 |
Investment Tax Credit |  | (0.2) | (0.7) | (0.9) |
Income Tax Expense (Benefit) |  | $ 148.1 | $ 97.4 | $ 172.8 |
Statutory Federal tax rate |  | 35.00% | 35.00% | 35.00% |
Federal renewable energy credit | [1] | (6.80%) | (8.90%) | (6.70%) |
Remeasurement of state deferred tax liabilities |  | 0.90% | (0.80%) | 0.40% |
401(k) dividends |  | (0.60%) | (0.70%) | (0.50%) |
Federal investment tax credits, net |  | (0.80%) | (0.20%) | (0.20%) |
State income taxes, net of Federal income tax benefit |  | 1.90% | 0.10% | 1.20% |
Uncertain tax positions |  | 0.10% | 0.70% | 0.50% |
Amortization of net unfunded deferred taxes |  | 0.70% | 0.90% | 0.60% |
Other |  | 0.10% | 0.30% | 0.10% |
Effective income tax rate |  | 30.50% | 26.40% | 30.40% |
Accrued liabilities |  | $ (16.1) | $ (14.0) |  |
Accrued vacation |  | (3.5) | (3.2) |  |
Uncollectible accounts |  | (0.6) | (0.5) |  |
Accelerated depreciation and other property related differences |  | 2,103.2 | 2,016.0 |  |
Investment in Enable Midstream Partners |  | 657.3 | 623.4 |  |
Regulatory asset |  | 34.4 | 32.7 |  |
Income taxes refundable to customers, net |  | 24.1 | 22.0 |  |
Income taxes refundable to customers, net |  | 16.5 | 13.7 |  |
Bond redemption-unamortized costs |  | 4.3 | 4.8 |  |
Derivative instruments |  | 2.2 | 1.5 |  |
Federal tax credits |  | (220.6) | (184.4) |  |
State tax credits |  | (112.2) | (106.7) |  |
Net operating losses |  | (31.7) | (94.6) |  |
Accrued liabilities |  | (48.9) | (56.2) |  |
Other |  | (34.6) | (46.3) |  |
Asset retirement obligations |  | (24.5) | (22.5) |  |
Deferred Federal investment tax credits |  | (0.8) | (0.9) |  |
Other |  | (14.0) | (6.6) |  |
Non-Current Deferred Income Tax Liabilities, net |  | 2,334.5 | 2,178.2 |  |
Unrecognized Tax Benefits |  | 20.7 | 20.2 | $ 16.1 | $ 12.0
Current year additions |  | 0.5 | 4.1 | 4.1 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 0.0 |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  | 0.5 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 220.6 | 184.4 |  |
Employee Service Share-based Compensation, Unrecognized Tax Benefit from Compensation Expense |  | 24.8 |  |  |
State operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | 554.7 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | $ 20.4 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2030 |  |  |
Federal operating loss [Member] |  |  |  |  |
Operating Loss Carryforwards |  | $ 32.2 |  |  |
Net operating losses |  | $ 11.3 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2030 |  |  |
Federal tax credits [Member] |  |  |  |  |
Federal tax credits |  | $ (220.6) |  |  |
Tax Credit Carryforward, Amount |  | 220.6 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 220.6 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2029 |  |  |
Oklahoma investment tax credits [Member] |  |  |  |  |
Federal tax credits |  | $ (88.2) |  |  |
Tax Credit Carryforward, Amount |  | 135.7 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 88.2 |  |  |
Oklahoma capital investment board credits [Member] |  |  |  |  |
Federal tax credits |  | (7.3) |  |  |
Tax Credit Carryforward, Amount |  | 7.3 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | 7.3 |  |  |
Oklahoma zero emission tax credits [Member] |  |  |  |  |
Federal tax credits |  | (16.2) |  |  |
Tax Credit Carryforward, Amount |  | 24.1 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 16.2 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2020 |  |  |
Louisiana inventory credits [Member] [Member] [Domain] |  |  |  |  |
Federal tax credits |  | $ (0.5) |  |  |
Tax Credit Carryforward, Amount |  | 0.7 |  |  |
Tax Credit Carryforward, Deferred Tax Asset |  | $ 0.5 |  |  |
Tax Credit Carryforward, Expiration Date |  | Dec. 31, 2019 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  | $ 0.3 |  |  |
OGE Energy Corp. [Member] |  |  |  |  |
Unrecognized Tax Benefits |  | 13.7 |  |  |
Og and E [Member] |  |  |  |  |
Unrecognized Tax Benefits |  | $ 13.5 | $ 13.2 | $ 10.5 |
[1] | Represents credits associated with the production from OG&E's wind farms.

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