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Schedule II - Valuation and Qualifying Accounts (Details) - SEC Schedule, 12-09, Reserve, Allowance For Doubtful Accounts - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 8,333 $ 1,163 $ 1,406
Charged to costs and expenses 4,663 3,527 2,835
Charged to other accounts 826 6,070 0
Write-offs and other 6,557 2,427 3,078
Balance at end of year 7,265 8,333 1,163
Public Service Company of New Mexico      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 8,333 1,163 1,406
Charged to costs and expenses 4,597 3,482 2,790
Charged to other accounts 826 6,070 0
Write-offs and other 6,491 2,382 3,033
Balance at end of year 7,265 8,333 1,163
Texas-New Mexico Power Company      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 0 0 0
Charged to costs and expenses 66 45 44
Charged to other accounts 0 0 0
Write-offs and other 66 45 44
Balance at end of year $ 0 $ 0 $ 0