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v3.22.1

Financing - Financing Activities (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 24, 2022 USD ($) | Mar. 09, 2021 USD ($) | Dec. 22, 2020 USD ($) | Mar. 31, 2022 | Dec. 31, 2021 USD ($) | Apr. 27, 2022 USD ($) bond_series | Apr. 21, 2022 USD ($) | Jan. 31, 2022 USD ($) | May 18, 2021 USD ($) | Mar. 09, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  |  | $ 40,000,000 |  |
Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  | $ 705,500,000 |  |  |
PNMR 2020 Delayed-Draw Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 300,000,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 80,000,000 |  |  |  |  |  |  |
Remaining borrowing capacity |  | $ 220,000,000 |  |  |  |  |  |  |  |
PNM | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  | 400,000,000 |  |  |
PNM | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity term over which financings require regulator approval (more than) |  |  |  | 18 months |  |  |  |  |  |
Texas-New Mexico Power Company | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  | $ 0 |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Ratio of debt to capital (less than or equal to) |  |  |  | 70.00% |  |  |  |  |  |
Line of credit | PNMR 2021 Delayed-Draw Term Loan | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Proceeds from long-term lines of credit | $ 100,000,000 |  |  |  | $ 900,000,000 |  |  |  |  |
Line of credit | PNM and TNMP |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Ratio of debt to capital (less than or equal to) |  |  |  | 65.00% |  |  |  |  |  |
Unsecured Debt | PNMR 2018 SUNS 3.25% due March 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 300,000,000
Stated interest rate |  |  |  |  |  |  |  |  |  | 3.25%
Repayments of debt |  | $ 80,000,000 |  |  |  |  |  |  |  |
Bonds | TNMP 2022 Bond Purchase Agreement at 4.13% Due May 12, 2022 | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.13% |  |  |  |
Bonds | TNMP 2022 Bond Purchase Agreement at 3.81% Due July 28, 2032 | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 3.81% |  |  |  |
Bonds | PNMR 2021 Delayed-Draw Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  | 1.29% |  |  |  |  |  |
Bonds | PNM | PNM 2021 75 Million Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  | 1.28% |  |  |  |  |  |
Bonds | Texas-New Mexico Power Company | TNMP 2022 Bond Purchase Agreement | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 160,000,000 |  |  |  |
Debt instrument, series of bond issuance | bond_series |  |  |  |  |  | 2 |  |  |  |
Bonds | Texas-New Mexico Power Company | TNMP 2022 Bond Purchase Agreement at 4.13% Due May 12, 2022 | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 65,000,000 |  |  |  |
Bonds | Texas-New Mexico Power Company | TNMP 2022 Bond Purchase Agreement at 3.81% Due July 28, 2032 | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 95,000,000 |  |  |  |

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