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Condensed Consolidated Statements of Earnings - TNMP - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cost of Revenue [Abstract]    
Contracts with customers $ 384,493 $ 346,585
Alternative revenue programs (5,505) (909)
Total electric operating revenues 444,118 364,707
Operating Expenses:    
Administrative and general 55,861 59,465
Depreciation and amortization 75,764 69,874
Transmission and distribution costs 18,466 17,317
Taxes other than income taxes 23,979 22,593
Total operating expenses 376,050 321,541
Operating income 68,068 43,166
Other Income and Deductions:    
Interest income 4,292 3,559
Other income 4,330 4,252
Other (deductions) (2,241) (3,290)
Net other income and deductions (20,192) 5,489
Interest Charges 26,220 25,884
Earnings before Income Taxes 21,656 22,771
Income Taxes 2,438 1,566
Texas-New Mexico Power Company    
Cost of Revenue [Abstract]    
Contracts with customers 108,849 95,379
Alternative revenue programs (3,440) (1,885)
Total electric operating revenues 105,409 93,494
Operating Expenses:    
Cost of energy 29,600 26,510
Administrative and general 12,013 12,230
Depreciation and amortization 23,642 22,190
Transmission and distribution costs 6,855 6,658
Taxes other than income taxes 9,057 8,881
Total operating expenses 81,167 76,469
Operating income 24,242 17,025
Other Income and Deductions:    
Interest income 1,182 0
Other income 1,052 1,386
Other (deductions) (115) (324)
Net other income and deductions 2,119 1,062
Interest Charges 9,150 8,475
Earnings before Income Taxes 17,211 9,612
Income Taxes 2,151 877
Net Earnings Attributable to PNM $ 15,060 $ 8,735