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Schedule I - Condensed Financial Information of Parent Company - Statements of Cash flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash Flows From Operating Activities: |  |  |
Net Cash Flows From Operating Activities | $ 508,160 | $ 551,171 | $ 567,284
Cash Flows From Investing Activities: |  |  |
Net cash flows used in investing activities | (1,174,372) | (1,088,406) | (950,347)
Cash Flows From Financing Activities: |  |  |
Revolving credit facility borrowings | 2,892,200 | 2,358,900 | 1,829,500
Revolving credit facilities repayments | (2,544,800) | (2,329,000) | (1,660,200)
Long-term borrowings | 1,233,000 | 1,358,096 | 558,000
Repayment of long-term debt | (819,529) | (910,000) | (179,500)
Issuance of common stock | 98,601 | 198,177 | 0
Dividends paid | (140,339) | (126,705) | (119,839)
Debt issuance costs and other, net | (20,482) | (9,836) | (5,564)
Net cash flows from financing activities | 684,354 | 537,100 | 386,037
Change in Cash, Cash Equivalents, and Restricted Cash | 18,142 | (135) | 2,974
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year | 3,943 | 4,078 | 1,104
Cash, Cash Equivalents, and Restricted Cash at End of Year | 22,085 | 3,943 | 4,078
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 207,972 | 155,273 | 118,485
Income taxes paid (refunded), net | (998) | 1,505 | (1,011)
PNM Resources |  |  |
Cash Flows From Operating Activities: |  |  |
Net Cash Flows From Operating Activities | (36,927) | (31,368) | (10,261)
Cash Flows From Investing Activities: |  |  |
Additions to non-utility plant | 839 | 1,138 | 1,136
Investments in subsidiaries | (112,000) | (85,500) | (70,200)
Cash dividends from subsidiaries | 153,000 | 0 | 153,500
Net cash flows used in investing activities | 41,839 | (84,362) | 84,436
Cash Flows From Financing Activities: |  |  |
Short-term borrowings (repayments) -affiliate, net | 21,100 | (5,300) | (700)
Revolving credit facility borrowings | 822,000 | 837,000 | 640,400
Revolving credit facilities repayments | (797,400) | (777,100) | (685,900)
Long-term borrowings | 550,000 | 500,000 | 100,000
Repayment of long-term debt | (539,000) | (500,000) | 0
Issuance of common stock | 98,601 | 198,177 | 0
Awards of common stock | (8,460) | (9,646) | (7,980)
Dividends paid | (139,811) | (126,177) | (119,311)
Debt issuance costs and other, net | (11,945) | (1,221) | (686)
Net cash flows from financing activities | (4,915) | 115,733 | (74,177)
Change in Cash, Cash Equivalents, and Restricted Cash | (3) | 3 | (2)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year | 64 | 61 | 63
Cash, Cash Equivalents, and Restricted Cash at End of Year | 61 | 64 | 61
Supplemental Cash Flow Disclosures: |  |  |
Interest paid, net of amounts capitalized | 71,917 | 47,122 | 29,904
Income taxes paid (refunded), net | $ (1,707) | $ 350 | $ (2,500)

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