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Financing (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Short-term Debt | Short-term debt outstanding consists of:
|  | December 31,
Short-term Debt |  | 2017 |  | 2016
|  | (In thousands)
PNM: |  |  |  |
PNM Revolving Credit Facility |  | $ | 39,800 |  |  | $ | 35,000 |
PNM 2014 New Mexico Credit Facility |  | — |  |  | 26,000 |
PNM 2017 New Mexico Credit Facility |  | — |  |  | — |
|  | 39,800 |  |  | 61,000 |
TNMP Revolving Credit Facility |  | — |  |  | — |
PNMR: |  |  |  |
PNMR Revolving Credit Facility |  | 165,600 |  |  | 126,100 |
PNMR 2016 One-Year Term Loan |  | 100,000 |  |  | 100,000 |
|  | $ | 305,400 |  |  | $ | 287,100 |
Schedule of maturities and interest rates | Information concerning the maturities and interest rates on the PNM 2018 SUNs to be issued in May 2018 and August 2018 is as follows:
Scheduled |  |  |  |  |  |
Funding |  | Maturity |  | Principal |  | Interest
Date |  | Date |  | Amount |  | Rate
|  |  |  | (In millions) |  |
May 15, 2018 |  | May 15, 2023 |  | $ | 55.0 |  |  | 3.15 | %
May 15, 2018 |  | May 15, 2025 |  | 104.0 |  |  | 3.45 | %
May 15, 2018 |  | May 15, 2028 |  | 88.0 |  |  | 3.68 | %
May 15, 2018 |  | May 15, 2033 |  | 38.0 |  |  | 3.93 | %
May 15, 2018 |  | May 15, 2038 |  | 45.0 |  |  | 4.22 | %
May 15, 2018 |  | May 15, 2048 |  | 20.0 |  |  | 4.50 | %
|  |  |  | 350.0 |  |  |
August 1, 2018 |  | August 1, 2028 |  | 15.0 |  |  | 3.78 | %
August 1, 2018 |  | August 1, 2048 |  | 85.0 |  |  | 4.60 | %
|  |  |  | 100.0 |  |  |
|  |  |  | $ | 450.0 |  |  |
Information concerning long-term debt outstanding and unamortized (premiums), discounts, and debt issuance costs is as follows:
|  | December 31, 2017 |  | December 31, 2016
|  | Principal |  | Unamortized Discounts, (Premiums), and Issuance Costs, net |  | Principal |  | Unamortized Discounts, (Premiums), and Issuance Costs, net
|  | (In thousands)
PNM Debt |  |  |  |  |  |  |  |
Senior Unsecured Notes, Pollution Control Revenue Bonds: |  |  |  |  |  |  |  |
1.875% due April 2033, mandatory tender - October 1, 2021 |  | $ | 146,000 |  |  | $ | 1,383 |  |  | $ | 146,000 |  |  | $ | 1,807 |
6.25% due January 2038 |  | 36,000 |  |  | 228 |  |  | 36,000 |  |  | 239 |
4.75% due June 2040, mandatory tender - June 1, 2017 |  | — |  |  | — |  |  | 37,000 |  |  | 25 |
2.125% due June 2040, mandatory tender - June 1, 2022 |  | 37,000 |  |  | 404 |  |  | — |  |  | — |
5.20% due June 2040, mandatory tender - June 1, 2020 |  | 40,045 |  |  | 105 |  |  | 40,045 |  |  | 147 |
5.90% due June 2040 |  | 255,000 |  |  | 2,040 |  |  | 255,000 |  |  | 2,131 |
6.25% due June 2040 |  | 11,500 |  |  | 92 |  |  | 11,500 |  |  | 96 |
2.54% due September 2042, mandatory tender - June 1, 2017 |  | — |  |  | — |  |  | 20,000 |  |  | 67 |
2.45% due September 2042, mandatory tender - June 1, 2022 |  | 20,000 |  |  | 153 |  |  | — |  |  | — |
2.40% due June 2043, mandatory tender - June 1, 2020 |  | 39,300 |  |  | 243 |  |  | 39,300 |  |  | 340 |
5.20% due June 2043, mandatory tender - June 1, 2020 |  | 21,000 |  |  | 53 |  |  | 21,000 |  |  | 75 |
Senior Unsecured Notes: |  |  |  |  |  |  |  |
7.95% due May 2018 |  | 350,000 |  |  | 272 |  |  | 350,000 |  |  | 995 |
7.50% due August 2018 |  | 100,025 |  |  | 73 |  |  | 100,025 |  |  | 197 |
5.35% due October 2021 |  | 160,000 |  |  | 617 |  |  | 160,000 |  |  | 780 |
3.85% due August 2025 |  | 250,000 |  |  | 2,274 |  |  | 250,000 |  |  | 2,574 |
PNM 2016 Term Loan Agreement due November 2017 |  | — |  |  | — |  |  | 175,000 |  |  | 28 |
PNM 2017 Term Loan Agreement due January 2019 |  | 200,000 |  |  | 23 |  |  | — |  |  | — |
|  | 1,665,870 |  |  | 7,960 |  |  | 1,640,870 |  |  | 9,501 |
Less current maturities |  | 25 |  |  | 2 |  |  | 232,000 |  |  | 120 |
|  | 1,665,845 |  |  | 7,958 |  |  | 1,408,870 |  |  | 9,381 |
TNMP Debt |  |  |  |  |  |  |  |
First Mortgage Bonds: |  |  |  |  |  |  |  |
9.50% due April 2019 |  | 172,302 |  |  | 1,032 |  |  | 172,302 |  |  | 1,857 |
6.95% due April 2043 |  | 93,198 |  |  | (18,057 | ) |  | 93,198 |  |  | (18,773 | )
4.03% due July 2024 |  | 80,000 |  |  | 686 |  |  | 80,000 |  |  | 792 |
3.53% due February 2026 |  | 60,000 |  |  | 667 |  |  | 60,000 |  |  | 749 |
3.22% due August 2027 |  | 60,000 |  |  | 552 |  |  | — |  |  | — |
|  | 465,500 |  |  | (15,120 | ) |  | 405,500 |  |  | (15,375 | )
Less current maturities |  | — |  |  | — |  |  | — |  |  | — |
|  | 465,500 |  |  | (15,120 | ) |  | 405,500 |  |  | (15,375 | )
PNMR Debt |  |  |  |  |  |  |  |
PNMR 2015 Term Loan Agreement due March 2018 |  | 150,000 |  |  | 12 |  |  | 150,000 |  |  | 84 |
BTMU Term Loan Agreement, payments through February 2021 |  | 50,137 |  |  | 1,001 |  |  | 92,207 |  |  | 1,634 |
PNMR 2016 Two-Year Term Loan due December 2018 |  | 100,000 |  |  | 9 |  |  | 100,000 |  |  | 21 |
|  | 300,137 |  |  | 1,022 |  |  | 342,207 |  |  | 1,739 |
Less current maturities |  | 257,268 |  |  | 396 |  |  | 42,025 |  |  | 557 |
|  | 42,869 |  |  | 626 |  |  | 300,182 |  |  | 1,182 |
Total Consolidated PNMR Debt |  | 2,431,507 |  |  | (6,138 | ) |  | 2,388,577 |  |  | (4,135 | )
Less current maturities |  | 257,293 |  |  | 398 |  |  | 274,025 |  |  | 677 |
|  | $ | 2,174,214 |  |  | $ | (6,536 | ) |  | $ | 2,114,552 |  |  | $ | (4,812 | )
Schedule of Maturities of Long-term Debt | Reflecting mandatory tender dates and the impacts of the refinancing under the PNM 2017 Senior Unsecured Note Agreement discussed above, long-term debt matures as follows:
| PNMR |  | PNM |  | TNMP |  | PNMR Consolidated
| (In thousands)
2018 | $ | 257,268 |  |  | $ | 25 |  |  | $ | — |  |  | $ | 257,293 |
2019 | 12,357 |  |  | 200,000 |  |  | 172,302 |  |  | 384,659 |
2020 | 25,862 |  |  | 100,345 |  |  | — |  |  | 126,207 |
2021 | 4,650 |  |  | 306,000 |  |  | — |  |  | 310,650 |
2022 | — |  |  | 57,000 |  |  | — |  |  | 57,000 |
Thereafter | — |  |  | 1,002,500 |  |  | 293,198 |  |  | 1,295,698 |
Total | $ | 300,137 |  |  | $ | 1,665,870 |  |  | $ | 465,500 |  |  | $ | 2,431,507 |

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