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Schedule I - Condensed Financial Information of Parent Company - Statements of Earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating Revenues | $ 1,779,873 | $ 1,523,012 | $ 1,457,603
Operating Expenses | 1,471,720 | 1,237,731 | 1,313,403
Operating income | 308,153 | 285,281 | 144,200
Other Income and Deductions: |  |  |
Other income | 20,200 | 19,973 | 15,382
Net other income and (deductions) | 33,153 | 37,063 | 43,665
Interest Charges | 96,877 | 114,392 | 121,016
Earnings before Income Taxes | 244,429 | 207,952 | 66,849
Income taxes (benefit) | 32,582 | 20,636 | (25,282)
PNM Resources |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating Revenues | 0 | 0 | 0
Operating Expenses | 15,044 | 28,299 | 3,983
Operating income | (15,044) | (28,299) | (3,983)
Other Income and Deductions: |  |  |
Equity in earnings of subsidiaries | 221,004 | 211,291 | 96,324
Other income | 362 | (269) | 731
Net other income and (deductions) | 221,366 | 211,022 | 97,055
Interest Charges | 11,986 | 19,078 | 19,581
Earnings before Income Taxes | 194,336 | 163,645 | 73,491
Income taxes (benefit) | (1,493) | (9,130) | (3,872)
Net earnings | $ 195,829 | $ 172,775 | $ 77,363

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