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v3.23.1

Fair Value of Derivative and Other Financial Instruments - Items Recorded and Presented by Level of Hierarchy (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | $ 3,762,893 |  | $ 3,726,195
Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 4,077,980 |  | 4,077,387
PNM |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 1,812,093 |  | 1,789,186
PNM | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 2,001,457 |  | 2,000,900
TNMP |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 950,800 |  | 937,009
TNMP | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 1,076,871 |  | 1,076,875
Recurring | PNM |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 431,328 |  | 417,476
Investments, unrealized gain | 13,454 | $ 9,986 |
Recurring | PNM | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 225,829 |  | 219,740
Recurring | PNM | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 205,499 |  | 197,736
Recurring | PNM | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 46,541 |  | 66,843
Recurring | PNM | Cash and cash equivalents | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 46,541 |  | 66,843
Recurring | PNM | Cash and cash equivalents | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 0 |  | 0
Recurring | PNM | Corporate stocks, common |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 70,847 |  | 40,103
Recurring | PNM | Corporate stocks, common | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 70,847 |  | 40,103
Recurring | PNM | Corporate stocks, common | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 0
Recurring | PNM | Corporate stocks, preferred |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 4,727 |  | 5,191
Recurring | PNM | Corporate stocks, preferred | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 642 |  | 790
Recurring | PNM | Corporate stocks, preferred | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 4,085 |  | 4,401
Recurring | PNM | Mutual funds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 65,247 |  | 66,359
Recurring | PNM | Mutual funds and other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 65,247 |  | 66,359
Recurring | PNM | Mutual funds and other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 0
Recurring | PNM | U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 42,895 |  | 45,905
Investments, unrealized gain | 1,737 | 1,334 |
Recurring | PNM | U.S. government | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 42,552 |  | 45,645
Recurring | PNM | U.S. government | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 343 |  | 260
Recurring | PNM | International government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 10,845 |  | 9,762
Investments, unrealized gain | 1,311 | 1,117 |
Recurring | PNM | International government | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 0 |  | 0
Recurring | PNM | International government | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 10,845 |  | 9,762
Recurring | PNM | Municipals |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 43,528 |  | 43,136
Investments, unrealized gain | 1,612 | 1,062 |
Recurring | PNM | Municipals | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 0 |  | 0
Recurring | PNM | Municipals | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 43,528 |  | 43,136
Recurring | PNM | Corporate and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 146,698 |  | 140,177
Investments, unrealized gain | 8,794 | $ 6,473 |
Recurring | PNM | Corporate and other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  |  | 0
Recurring | PNM | Corporate and other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | $ 146,698 |  | $ 140,177

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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