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ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2024
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of changes to asset retirement obligations | The following table shows changes to our AROs:
(in millions) |  | 2024 |  | 2023 |
Balance at January 1 |  | $ | 374.2 |  |  | $ | 479.3 |  |
Accretion |  | 13.0 |  |  | 12.8 |  |
Additions |  | 165.9 |  | (1) | 16.6 |  | (2)
Liabilities settled |  | (5.2) |  |  | (3.2) |  |
Balance at September 30 |  | $ | 547.9 |  |  | $ | 505.5 |  |
(1) AROs increased primarily as a result of AROs being recorded related to the new EPA CCR Rule that was enacted in April 2024. See Note 23, Commitments and Contingencies, for more information. (2) AROs increased primarily as a result of AROs being recorded for the legal requirement to dismantle, at retirement, the Red Barn wind-powered generation project and the Sapphire Sky and Samson I non-utility renewable generation projects.

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- 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
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