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Financing - Long-term Debt (Details) - USD ($) | Apr. 01, 2019 | Dec. 31, 2019 | Dec. 18, 2019 | Jul. 01, 2019 | Mar. 29, 2019 | Feb. 26, 2019 | Jan. 18, 2019 | Dec. 31, 2018 | Dec. 21, 2018
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total |  | $ 3,004,043,000 |  |  |  |  |  | $ 2,666,345,000 |
Principal, less current maturities |  | 490,345,000 |  |  |  |  |  | 0 |
Long-term debt, excluding current maturities, gross |  | 2,513,698,000 |  |  |  |  |  | 2,666,345,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | (3,674,000) |  |  |  |  |  | (3,765,000) |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities |  | 77,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities |  | (3,751,000) |  |  |  |  |  | (3,765,000) |
PNMR 2018 Two-Year Term Loan due December 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 50,000,000.0
Public Service Company of New Mexico |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 1,755,845,000 |  |  |  |  |  | 1,665,845,000 |
Principal, less current maturities |  | 350,345,000 |  |  |  |  |  | 0 |
Long-term debt, excluding current maturities, gross |  | 1,405,500,000 |  |  |  |  |  | 1,665,845,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 7,825,000 |  |  |  |  |  | 9,355,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities |  | 77,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities |  | $ 7,748,000 |  |  |  |  |  | 9,355,000 |
Public Service Company of New Mexico | PNM 2019 $250.0 Million Term Loan due July 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 250,000,000.0 |  |
Public Service Company of New Mexico | PNM 2019 $40.0 Million Term Loan due June 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 40,000,000.0 |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 1.875% due April 2033, mandatory tender - October 1, 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 1.875% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 146,000,000 |  |  |  |  |  | 146,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 662,000 |  |  |  |  |  | 1,022,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 6.25% due January 2038 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 6.25% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 36,000,000 |  |  |  |  |  | 36,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 205,000 |  |  |  |  |  | 216,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.125% due June 2040, mandatory tender - June 1, 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 2.125% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 37,000,000 |  |  |  |  |  | 37,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 224,000 |  |  |  |  |  | 314,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.20% due June 2040, mandatory tender - June 1, 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 5.20% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 40,045,000 |  |  |  |  |  | 40,045,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 17,000 |  |  |  |  |  | 62,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.90% due June 2040 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 5.90% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 255,000,000 |  |  |  |  |  | 255,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 1,857,000 |  |  |  |  |  | 1,950,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 6.25% due June 2040 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 6.25% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 11,500,000 |  |  |  |  |  | 11,500,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 84,000 |  |  |  |  |  | 88,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.45% due September 2042, mandatory tender - June 1, 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 2.45% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 20,000,000 |  |  |  |  |  | 20,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 85,000 |  |  |  |  |  | 119,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 2.40% due June 2043, mandatory tender - June 1, 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 2.40% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 39,300,000 |  |  |  |  |  | 39,300,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 50,000 |  |  |  |  |  | 146,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.20% due June 2043, mandatory tender - June 1, 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 5.20% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 21,000,000 |  |  |  |  |  | 21,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 10,000 |  |  |  |  |  | 31,000 |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 5.35% due October 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 5.35% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.15% due May 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.15% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.45% due May 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.45% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.85% due August 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.85% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.68% due May 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.68% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.78% due August 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.78% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 3.93% due May 2033 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.93% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 4.22% due May 2038 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 4.22% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 4.50% due May 2048 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 4.50% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes, Pollution Control Revenue Bonds: | 4.60% due August 2048 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 4.60% |  |  |  |  |  |  |
Public Service Company of New Mexico | Senior Unsecured Notes: | 5.35% due October 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 160,000,000 |  |  |  |  |  | 160,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 292,000 |  |  |  |  |  | 455,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.15% due May 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 55,000,000 |  |  |  |  |  | 55,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 261,000 |  |  |  |  |  | 338,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.45% due May 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 104,000,000 |  |  |  |  |  | 104,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 562,000 |  |  |  |  |  | 666,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.85% due August 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 250,000,000 |  |  |  |  |  | 250,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 1,675,000 |  |  |  |  |  | 1,974,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.68% due May 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 88,000,000 |  |  |  |  |  | 88,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 518,000 |  |  |  |  |  | 581,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.78% due August 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 15,000,000 |  |  |  |  |  | 15,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 91,000 |  |  |  |  |  | 101,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 3.93% due May 2033 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 38,000,000 |  |  |  |  |  | 38,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 238,000 |  |  |  |  |  | 256,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.22% due May 2038 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 45,000,000 |  |  |  |  |  | 45,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 291,000 |  |  |  |  |  | 307,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.50% due May 2048 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 20,000,000 |  |  |  |  |  | 20,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 133,000 |  |  |  |  |  | 138,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | 4.60% due August 2048 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | 85,000,000 |  |  |  |  |  | 85,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 570,000 |  |  |  |  |  | 590,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2017 Term Loan due January 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 0 |  |  |  |  |  | 200,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 0 |  |  |  |  |  | 1,000 |
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2019 $250.0 Million Term Loan due July 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 250,000,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 0 |  |  |  |  |  | 0 |
Public Service Company of New Mexico | Senior Unsecured Notes: | PNM 2019 $40.0 Million Term Loan due June 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 40,000,000 |  |  |  |  |  |  |
Texas-New Mexico Power Company |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 658,198,000 |  |  |  |  |  | 560,500,000 |
Principal, less current maturities |  | 0 |  |  |  |  |  | 0 |
Long-term debt, excluding current maturities, gross |  | 658,198,000 |  |  |  |  |  | 560,500,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | (12,493,000) |  |  |  |  |  | (14,898,000) |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities |  | 0 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities |  | $ (12,493,000) |  |  |  |  |  | (14,898,000) |
Texas-New Mexico Power Company | Mortgages | TNMP 2019 Bond Purchase Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 225,000,000.0 | $ 305,000,000.0 |  |  |
Stated percentage |  |  |  |  |  | 400.00% |  |  |
Texas-New Mexico Power Company | Mortgages | 3.60% due July 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 80,000,000.0 |  |  |  |  |
Texas-New Mexico Power Company | Senior Unsecured Notes: | 9.50% due April 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of debt | $ 172,300,000 |  |  |  |  |  |  |  |
Stated percentage | 9.50% |  |  |  |  |  |  |  |
Texas-New Mexico Power Company | First Mortgage Bonds: | 9.50% due April 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 9.50% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 0 |  |  |  |  |  | 172,302,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 0 |  |  |  |  |  | 206,000 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 6.95% due April 2043 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 6.95% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 93,198,000 |  |  |  |  |  | 93,198,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ (16,632,000) |  |  |  |  |  | (17,347,000) |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.03% due July 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 4.03% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 80,000,000 |  |  |  |  |  | 80,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 475,000 |  |  |  |  |  | 580,000 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.53% due February 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.53% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 60,000,000 |  |  |  |  |  | 60,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 502,000 |  |  |  |  |  | 585,000 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.22% due August 2027 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.22% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 60,000,000 |  |  |  |  |  | 60,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 437,000 |  |  |  |  |  | 494,000 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.85% due June 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.85% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 60,000,000 |  |  |  |  |  | 60,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 531,000 |  |  |  |  |  | 584,000 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.79% due March 2034 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.79% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 75,000,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 535,000 |  |  |  |  |  | 0 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.92% due March 2039 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.92% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 75,000,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 542,000 |  |  |  |  |  | 0 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 4.06% due March 2044 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 4.06% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 75,000,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 546,000 |  |  |  |  |  | 0 |
Texas-New Mexico Power Company | First Mortgage Bonds: | 3.60% due July 2029 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.60% |  |  |  |  |  |  |
Unsecured long-term debt, noncurrent |  | $ 80,000,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 571,000 |  |  |  |  |  | 0 |
Texas-New Mexico Power Company | First Mortgage Bonds: | TNMP 2018 Term Loan due July 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 0 |  |  |  |  |  | 35,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 0 |  |  |  |  |  | 0 |
PNMR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total |  | 590,000,000 |  |  |  |  |  | 440,000,000 |
Principal, less current maturities |  | 140,000,000 |  |  |  |  |  | 0 |
Long-term debt, excluding current maturities, gross |  | 450,000,000 |  |  |  |  |  | 440,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 994,000 |  |  |  |  |  | 1,778,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net, Less current maturities |  | 0 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net, excluding current maturities |  | $ 994,000 |  |  |  |  |  | 1,778,000 |
PNMR | PNMR 3.25% 2018 SUNs due March 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 3.25% |  |  |  |  |  |  |
Long-term debt |  | $ 300,000,000 |  |  |  |  |  | 300,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 917,000 |  |  |  |  |  | 1,690,000 |
PNMR | PNMR Development Term Loan due November 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 90,000,000 |  |  |  |  |  | 90,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 42,000 |  |  |  |  |  | 88,000 |
PNMR | PNMR 2018 Two-Year Term Loan due December 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 50,000,000 |  |  |  |  |  | 50,000,000 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | 0 |  |  |  |  |  | 0 |
PNMR | PNMR 2019 Term Loan due June 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 150,000,000 |  |  |  |  |  | 0 |
Unamortized Discounts, (Premiums), and Issuance Costs, net |  | $ 35,000 |  |  |  |  |  | $ 0 |
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2017 Term Loan due January 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 200,000,000.0 |  |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2019 $250.0 Million Term Loan due July 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 2.45% |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A. and U.S. Bank National Association | Public Service Company of New Mexico | Notes Payable to Banks | PNM 2019 $40.0 Million Term Loan due June 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage |  | 2.39% |  |  |  |  |  |  |

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