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Schedule I - Condensed Financial Information of Parent Company - Statement of Cash flow (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash Flows From Operating Activities: |  |  |
Net Cash Flows From Operating Activities | $ 551,171 | $ 567,284 | $ 547,873
Cash Flows From Investing Activities: |  |  |
Net cash flows used in investing activities | (1,088,406) | (950,347) | (952,258)
Cash Flows From Financing Activities: |  |  |
Revolving credit facility borrowings (repayments), net | 29,900 | 169,300 | 30,700
Long-term borrowings | 1,358,096 | 558,000 | 1,816,345
Repayment of long-term debt | (910,000) | (179,500) | (1,411,345)
Issuance of common stock | 198,177 | 0 | 0
Dividends paid | (126,705) | (119,839) | (112,972)
Debt issuance costs and other, net | (9,836) | (5,564) | (6,306)
Net cash flows from financing activities | 537,100 | 386,037 | 357,561
Change in Cash, Cash Equivalents, and Restricted Cash | (135) | 2,974 | (46,824)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year | 4,078 | 1,104 | 47,928
Cash, Cash Equivalents, and Restricted Cash at End of Year | 3,943 | 4,078 | 1,104
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 155,273 | 118,485 | 91,276
Income taxes paid (refunded), net | 1,505 | (1,011) | 1,042
PNM Resources |  |  |
Cash Flows From Operating Activities: |  |  |
Net Cash Flows From Operating Activities | (31,368) | (10,261) | (28,514)
Cash Flows From Investing Activities: |  |  |
Utility plant additions | 1,138 | 1,136 | 543
Investments in subsidiaries | (85,500) | (70,200) | (178,071)
Cash dividends from subsidiaries | 0 | 153,500 | 60,000
Net cash flows used in investing activities | (84,362) | 84,436 | (117,528)
Cash Flows From Financing Activities: |  |  |
Short-term borrowings (repayments) -affiliate, net | (5,300) | (700) | 6,400
Revolving credit facility borrowings (repayments), net | 59,900 | (45,500) | 42,900
Long-term borrowings | 500,000 | 100,000 | 1,120,000
Repayment of long-term debt | (500,000) | 0 | (900,000)
Issuance of common stock | 198,177 | 0 | 0
Awards of common stock | (9,646) | (7,980) | (10,130)
Dividends paid | (126,177) | (119,311) | (112,444)
Debt issuance costs and other, net | (1,221) | (686) | (673)
Net cash flows from financing activities | 115,733 | (74,177) | 146,053
Change in Cash, Cash Equivalents, and Restricted Cash | 3 | (2) | 11
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year | 61 | 63 | 52
Cash, Cash Equivalents, and Restricted Cash at End of Year | 64 | 61 | 63
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 47,122 | 29,904 | 13,425
Income taxes paid (refunded), net | $ 350 | $ (2,500) | $ 0

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