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Schedule I - Condensed Financial Information of Parent Company - Statement of Cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows From Operating Activities:      
Net Cash Flows From Operating Activities $ 428,226 $ 523,462 $ 408,283
Cash Flows From Investing Activities:      
Net cash flows from investing activities (475,724) (466,163) (699,375)
Cash Flows From Financing Activities:      
Short-term loan 50,000 0 100,000
Repayment of short-term loan 0 0 (150,000)
Revolving credit facility borrowings (repayments), net (119,500) 18,300 86,500
Long-term borrowings 984,652 317,000 603,500
Repayment of long-term debt (750,162) (274,070) (303,793)
Proceeds from stock option exercise 963 1,739 7,028
Dividends paid (84,961) (77,792) (70,623)
Other, net (6,846) (2,942) (2,104)
Net cash flows from financing activities 45,646 (58,847) 242,392
Change in Cash and Cash Equivalents (1,852) (1,548) (48,700)
Cash and Cash Equivalents at Beginning of Period 3,974 5,522 54,222
Cash and Cash Equivalents at End of Period 2,122 3,974 5,522
Supplemental Cash Flow Disclosures:      
Interest paid, net of amounts capitalized 119,308 120,955 115,043
Income taxes paid (refunded), net 842 625 (307)
PNM Resources      
Cash Flows From Operating Activities:      
Net Cash Flows From Operating Activities (2,566) (7,814) 5,702
Cash Flows From Investing Activities:      
Utility plant additions 826 (180) 341
Investments in subsidiaries (30,000) (50,000) (98,343)
Cash dividends from subsidiaries 129,379 105,084 35,959
Net cash flows from investing activities 100,205 54,904 (62,043)
Cash Flows From Financing Activities:      
Short-term loan 50,000 0 100,000
Repayment of short-term loan 0 0 (150,000)
Revolving credit facility borrowings (repayments), net (148,700) 42,600 84,500
Long-term borrowings 349,652   100,000
Repayment of long-term debt (250,000) 0 0
Proceeds from stock option exercise 963 1,739 7,028
Purchases to satisfy awards of common stock (12,635) (13,929) (15,451)
Dividends paid (84,433) (77,264) (70,095)
Other, net (2,414) (269) (28)
Net cash flows from financing activities (97,567) (47,123) 55,954
Change in Cash and Cash Equivalents 72 (33) (387)
Cash and Cash Equivalents at Beginning of Period 21 54  
Cash and Cash Equivalents at End of Period 93 21 54
Supplemental Cash Flow Disclosures:      
Interest paid, net of amounts capitalized 15,450 10,899 5,906
Income taxes paid (refunded), net $ 0 $ 0 $ 0