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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2021
Fair Value Disclosures [Abstract] |
Fair value of assets and liabilities that are measured at fair value on a recurring basis | The following table presents the fair value at March 31, 2021 of our assets and liabilities that are measured at fair value on a recurring basis (dollars in thousands):
| Level 1 |  | Level 2 |  | Level 3 |  | Other |  |  |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Risk management activities — derivative instruments: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | — |  |  | $ | 14,353 |  |  | $ | 15,340 |  |  | $ | (3,882) |  |  | (a) |  | $ | 25,811 |
Nuclear decommissioning trust: |  |  |  |  |  |  |  |  |  |  |
Equity securities | 22,160 |  |  | — |  |  | — |  |  | (15,538) |  |  | (b) |  | 6,622 |
U.S. commingled equity funds | — |  |  | — |  |  | — |  |  | 648,199 |  |  | (c) |  | 648,199 |
U.S. Treasury debt | 175,707 |  |  | — |  |  | — |  |  | — |  |  |  |  | 175,707 |
Corporate debt | — |  |  | 143,876 |  |  | — |  |  | — |  |  |  |  | 143,876 |
Mortgage-backed securities | — |  |  | 110,073 |  |  | — |  |  | — |  |  |  |  | 110,073 |
Municipal bonds | — |  |  | 64,479 |  |  | — |  |  | — |  |  |  |  | 64,479 |
Other fixed income | — |  |  | 10,743 |  |  | — |  |  | — |  |  |  |  | 10,743 |
Subtotal nuclear decommissioning trust | 197,867 |  |  | 329,171 |  |  | — |  |  | 632,661 |  |  |  |  | 1,159,699 |
Other special use funds: |  |  |  |  |  |  |  |  |  |  |
Equity securities | 19,211 |  |  | — |  |  | — |  |  | 1,401 |  |  | (b) |  | 20,612 |
U.S. Treasury debt | 323,589 |  |  | — |  |  | — |  |  | — |  |  |  |  | 323,589 |
Municipal bonds | — |  |  | 13,305 |  |  | — |  |  | — |  |  |  |  | 13,305 |
Subtotal other special use funds | 342,800 |  |  | 13,305 |  |  | — |  |  | 1,401 |  |  |  |  | 357,506 |
Total assets | $ | 540,667 |  |  | $ | 356,829 |  |  | $ | 15,340 |  |  | $ | 630,180 |  |  |  |  | $ | 1,543,016 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Risk management activities — derivative instruments: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | — |  |  | $ | (11,668) |  |  | $ | (924) |  |  | $ | 2,597 |  |  | (a) |  | $ | (9,995) |
(a)Represents counterparty netting, margin, and collateral. See Note 7. (b)Represents net pending securities sales and purchases. (c)Valued using NAV as a practical expedient and, therefore, are not classified in the fair value hierarchy. The following table presents the fair value at December 31, 2020 of our assets and liabilities that are measured at fair value on a recurring basis (dollars in thousands):
| Level 1 |  | Level 2 |  | Level 3 |  | Other |  |  |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Risk management activities — derivative instruments: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | — |  |  | $ | 9,016 |  |  | $ | 4 |  |  | $ | (4,271) |  |  | (a) |  | $ | 4,749 |
Nuclear decommissioning trust: |  |  |  |  |  |  |  |  |  |  |
Equity securities | 29,796 |  |  | — |  |  | — |  |  | (17,828) |  |  | (b) |  | 11,968 |
U.S. commingled equity funds | — |  |  | — |  |  | — |  |  | 610,055 |  |  | (c) |  | 610,055 |
U.S. Treasury debt | 164,514 |  |  | — |  |  | — |  |  | — |  |  |  |  | 164,514 |
Corporate debt | — |  |  | 149,509 |  |  | — |  |  | — |  |  |  |  | 149,509 |
Mortgage-backed securities | — |  |  | 99,623 |  |  | — |  |  | — |  |  |  |  | 99,623 |
Municipal bonds | — |  |  | 89,705 |  |  | — |  |  | — |  |  |  |  | 89,705 |
Other fixed income | — |  |  | 13,061 |  |  | — |  |  | — |  |  |  |  | 13,061 |
Subtotal nuclear decommissioning trust | 194,310 |  |  | 351,898 |  |  | — |  |  | 592,227 |  |  |  |  | 1,138,435 |
Other special use funds: |  |  |  |  |  |  |  |  |  |  |
Equity securities | 37,337 |  |  | — |  |  | — |  |  | 504 |  |  | (b) |  | 37,841 |
U.S. Treasury debt | 203,220 |  |  | — |  |  | — |  |  | — |  |  |  |  | 203,220 |
Municipal bonds | — |  |  | 13,448 |  |  | — |  |  | — |  |  |  |  | 13,448 |
Subtotal other special use funds | 240,557 |  |  | 13,448 |  |  | — |  |  | 504 |  |  |  |  | 254,509 |
Total assets | $ | 434,867 |  |  | $ | 374,362 |  |  | $ | 4 |  |  | $ | 588,460 |  |  |  |  | $ | 1,397,693 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Risk management activities — derivative instruments: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | — |  |  | $ | (20,498) |  |  | $ | (1,107) |  |  | $ | 2,986 |  |  | (a) |  | $ | (18,619) |
(a)Represents counterparty netting, margin, and collateral. See Note 7. (b)Represents net pending securities sales and purchases. (c)Valued using NAV as a practical expedient and, therefore, are not classified in the fair value hierarchy.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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