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Regulatory Assets and Liabilities | 3 Months Ended
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Dec. 31, 2016
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Regulatory Assets and Liabilities Regulatory assets generally represent incurred costs that have been deferred because such costs are probable of future recovery in customer rates. Regulatory liabilities generally represent obligations to make refunds to customers for previous collections for costs that are not likely to be incurred or deferrals of gains that will be credited to customers in future periods. Components of regulatory assets and regulatory liabilities are summarized in the table below:
Regulatory Assets and Liabilities
| At December 31, 2016 |  | At September 30, 2016
Current regulatory assets |  |  |
Deferred nuclear generating units | $ | 237 |  |  | $ | 237 |
Unrealized losses on commodity derivatives | 104 |  |  | 122 |
Fuel cost adjustment receivable | 41 |  |  | 98 |
Environmental agreements | 27 |  |  | 34 |
Environmental cleanup costs - Kingston ash spill | 42 |  |  | 42 |
Other current regulatory assets | 3 |  |  | 3 |
Total current regulatory assets | 454 |  |  | 536 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,330 |  |  | 5,385 |
Unrealized losses on interest rate derivatives | 1,106 |  |  | 1,547 |
Nuclear decommissioning costs | 935 |  |  | 938 |
Deferred nuclear generating units | 915 |  |  | 850 |
Non-nuclear decommissioning costs | 863 |  |  | 819 |
Environmental cleanup costs - Kingston ash spill | 288 |  |  | 299 |
Unrealized losses on commodity derivatives | 32 |  |  | 56 |
Environmental agreements | 15 |  |  | 18 |
Other non-current regulatory assets | 244 |  |  | 252 |
Total non-current regulatory assets | 9,728 |  |  | 10,164 |
Total regulatory assets | $ | 10,182 |  |  | $ | 10,700 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 151 |  |  | $ | 148 |
Unrealized gains on commodity derivatives | 22 |  |  | 6 |
Total current regulatory liabilities | 173 |  |  | 154 |
Non-current regulatory liabilities |  |  |  |  |
Unrealized gains on commodity derivatives | 6 |  |  | 3 |
Total non-current regulatory liabilities | 6 |  |  | 3 |
Total regulatory liabilities | $ | 179 |  |  | $ | 157 |
Deferred Nuclear Generation Units. On November 14, 2016, following a public auction, TVA entered into a contract to sell substantially all of the Bellefonte Nuclear Plant ("Bellefonte") site for $111 million. The net book value of the Bellefonte assets to be sold and the related asset retirement costs are collectively $121 million and are included in Regulatory asset-Deferred nuclear generating units on TVA’s Consolidated Balance Sheet at December 31, 2016, as approved by the TVA Board. TVA received $22 million on November 14, 2016, which is recorded as a long-term liability on TVA’s Consolidated Balance Sheet at December 31, 2016, with the remaining $89 million due at closing. The buyer has up to two years to close on the property. Proceeds received from the sale will be recorded as a reduction to the regulatory asset upon closing and will reduce amounts collected in future rates. Any subsequent losses resulting from the disposition or impairment of Bellefonte will be recovered in future rates until fully recovered based upon the TVA Board-approved recovery of the Regulatory asset-Deferred nuclear generating units in future rates at an amount of $237 million per year until fully recovered.

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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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