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Regulatory Assets and Liabilities | 12 Months Ended
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Dec. 31, 2011
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Regulatory Assets and Liabilities Included in SCE's regulatory assets and liabilities are regulatory balancing accounts. CPUC authorized balancing account mechanisms require SCE to refund or recover any differences between forecasted and actual costs. The CPUC has authorized balancing accounts for specified costs or programs such as fuel, purchased-power, demand-side management programs, nuclear decommissioning and public purpose programs. Certain of these balancing accounts include a return on rate base of 8.75%. The CPUC also authorizes the use of a balancing account to recover from or refund to customers differences in revenue resulting from actual and forecasted electricity sales. Balancing account over and under collections represent differences between cash collected in current rates for specified forecasted costs and these costs that are actually incurred. Under-collections are recorded as regulatory balancing account assets. Over-collections are recorded as regulatory balancing account liabilities. With some exceptions, SCE seeks to adjust rates on an annual basis or at other designated times to recover or refund the balances recorded in its balancing accounts. Regulatory balancing accounts that SCE does not expect to collect or refund in the next 12 months are reflected in the long-term section of the consolidated balance sheets. Under collections and over collections accrue interest based on a three-month commercial paper rate published by the Federal Reserve. Amounts included in regulatory assets and liabilities are generally recorded with corresponding offsets to the applicable income statement accounts. Regulatory Assets Regulatory assets included on the consolidated balance sheets are:
|  | December 31,
(in millions) |  | 2011 | 2010
Current: |  |  |
Regulatory balancing accounts |  | $ | 223 |  | $ | 213 |
Energy derivatives |  | 264 |  | 162 |
Other |  | 7 |  | 3 |
Total Current |  | 494 |  | 378 |
Long-term: |  |  |
Deferred income taxes – net |  | 2,020 |  | 1,855 |
Pensions and other postretirement benefits |  | 1,703 |  | 1,097 |
Unamortized investments – net |  | 484 |  | 460 |
Unamortized loss on reacquired debt |  | 249 |  | 268 |
Energy derivatives |  | 836 |  | 177 |
Nuclear-related investment – net |  | 156 |  | 154 |
Regulatory balancing accounts |  | 69 |  | 56 |
Other |  | 298 |  | 280 |
Total Long-term |  | 5,815 |  | 4,347 |
Total Regulatory Assets |  | $ | 6,309 |  | $ | 4,725 |
SCE's regulatory assets related to energy derivatives are primarily an offset to unrealized losses on derivatives. The regulatory asset changes based on fluctuations in the fair market value of the contracts, which expire in 1 to 12 years. SCE's regulatory assets related to deferred income taxes represent tax benefits passed through to customers. The CPUC requires SCE to pass through certain deferred income tax benefits to customers by reducing electricity rates, thereby deferring recovery of such amounts to future periods. Based on current regulatory ratemaking and income tax laws, SCE expects to recover its regulatory assets related to deferred income taxes over the life of the assets that give rise to the accumulated deferred income taxes, ranging from 1 to 45 years. SCE's regulatory assets related to pensions and other post-retirement plans represents the unfunded net loss and prior service costs of the plans (see "Pension Plans and Postretirement Benefits Other than Pensions" discussion in Note 8). This amount is being recovered through rates charged to customers as the plans are funded. SCE's unamortized investments include nuclear assets related to San Onofre which are expected to be recovered by 2022, nuclear assets related to Palo Verde which are expected to be recovered by 2027 and SCE's unamortized coal plant investment which is being recovered through June 2016. Unamortized investments also include legacy meters retired as part of the EdisonSmartConnect TM program which are expected to be recovered by 2025. Although SCE's unamortized investments are classified as regulatory assets on the consolidated balance sheets, they continue to be a component of rate base and earned an 8.75% return in both 2011 and 2010. SCE's net regulatory asset related to its unamortized loss on reacquired debt will be recovered over the remaining original amortization period of the reacquired debt over periods ranging from 1 to 27 years. SCE's nuclear-related investment include assets and accumulated depreciation related to the AROs for San Onofre and Palo Verde, which are expected to be recovered by 2022 and 2027, respectively. These assets are included in rate base and earned a return of 8.75% in 2011 and 2010. Regulatory Liabilities Regulatory liabilities included on the consolidated balance sheets are:
|  | December 31,
(in millions) |  | 2011 | 2010
Current: |  |  |
Regulatory balancing accounts |  | $ | 661 |  | $ | 733 |
Other |  | 9 |  | 5 |
Total Current |  | 670 |  | 738 |
Long-term: |  |  |
Costs of removal |  | 2,697 |  | 2,623 |
Asset Retirement Obligations |  | 1,105 |  | 1,099 |
Regulatory balancing accounts |  | 864 |  | 802 |
Other |  | 4 |  | — |
Total Long-term |  | 4,670 |  | 4,524 |
Total Regulatory Liabilities |  | $ | 5,340 |  | $ | 5,262 |
SCE's regulatory liabilities related to costs of removal represent operating revenue collected for asset removal costs that SCE expects to incur in the future. These balances will be returned to customers in a future ratemaking proceeding, be charged against expense to the extent that future expenses exceed amounts recoverable through the ratemaking process, or be applied as otherwise directed by the CPUC. SCE's regulatory liabilities related to the AROs represent timing differences between the AROs and the assets of the nuclear decommissioning trust. The balance varies due to changes in the AROs as well as nuclear decommissioning trust investment activities.

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- Definition Detailed information about regulatory assets and liabilities that result from rate actions of a regulator. Rate actions from a regulator can impose a asset or liability on a regulated enterprise resulting in a regulatory asset or regulatory liability. + References No definition available. + Details
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