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Fair Value of Derivative and Other Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Commodity Derivatives | PNM’s commodity derivative instruments that are recorded at fair value, all of which are accounted for as economic hedges, are presented in the following line items on the Consolidated Balance Sheets:
| Economic Hedges
| December 31,
| 2019 |  | 2018
| (In thousands)
Other current assets | $ | 1,089 |  |  | $ | 1,083 |
Other deferred charges | 1,507 |  |  | 2,511 |
| 2,596 |  |  | 3,594 |
Other current liabilities | (1,089 | ) |  | (1,177 | )
Other deferred credits | (1,507 | ) |  | (2,511 | )
| (2,596 | ) |  | (3,688 | )
Net | $ | — |  |  | $ | (94 | )
Summary of the Effect of Mark-to-Market Commodity Derivative Instruments on Earnings | The following table presents the effect of mark-to-market commodity derivative instruments on PNM’s earnings, excluding income tax effects. Commodity derivatives had no impact on OCI for the periods presented.
| Economic Hedges
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
| (In thousands)
Electric operating revenues | $ | 97 |  |  | $ | (50 | ) |  | $ | 5,151 |
Cost of energy | (97 | ) |  | (52 | ) |  | (5,386 | )
Total gain (loss) | $ | — |  |  | $ | (102 | ) |  | $ | (235 | )
Schedule of Net Buy (Sell) Volume Positions | The table below presents PNM’s net buy (sell) volume positions:
| Economic Hedges
| MMBTU |  | MWh
December 31, 2019 | — |  |  | — |
December 31, 2018 | 100,000 |  |  | — |
Schedule of Realized Gain (Loss) | Gross realized losses shown below exclude the (increase)/decrease in realized impairment losses of $3.0 million, $(9.4) million, and $3.3 million for the years ended December 31, 2019, 2018 and 2017.
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
| (In thousands)
Proceeds from sales | $ | 494,528 |  |  | $ | 984,533 |  |  | $ | 637,492 |
Gross realized gains | $ | 25,760 |  |  | $ | 19,358 |  |  | $ | 36,896 |
Gross realized (losses) | $ | (17,453 | ) |  | $ | (16,624 | ) |  | $ | (12,993 | )
Gains and losses recognized on the Consolidated Statements of Earnings related to investment securities in the NDT and reclamation trusts are presented in the following table:
|  | Year ended December 31,
|  | 2019 |  | 2018
|  | (In thousands)
Equity securities: |  |  |  |
Net gains from equity securities sold |  | $ | 5,698 |  |  | $ | 4,864 |
Net gains (losses) from equity securities still held |  | 18,319 |  |  | (10,523 | )
Total net gains (losses) on equity securities |  | 24,017 |  |  | (5,659 | )
Available-for-sale debt securities: |  |  |  |
Net gains (losses) on debt securities |  | 5,572 |  |  | (11,517 | )
Net gains (losses) on investment securities |  | $ | 29,589 |  |  | $ | (17,176 | )
Investments Classified by Contractual Maturity Date | At December 31, 2019, the available-for-sale debt securities held by PNM, had the following final maturities:
| Fair Value
| (In thousands)
Within 1 year | $ | 20,148 |
After 1 year through 5 years | 80,052 |
After 5 years through 10 years | 84,603 |
After 10 years through 15 years | 13,090 |
After 15 years through 20 years | 11,950 |
After 20 years | 39,975 |
| $ | 249,818 |
Schedule of Instruments Presented by Level of Hierarchy | Items recorded at fair value by PNM on the Consolidated Balance Sheets are presented below by level of the fair value hierarchy along with gross unrealized gains on investments in available-for-sale securities.
|  |  | GAAP Fair Value Hierarchy |  |
| Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Unrealized Gains
| (In thousands)
December 31, 2019 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 15,606 |  |  | $ | 15,606 |  |  | $ | — |  |  | $ | — |  |  |
Equity securities: |  |  |  |  |  |  |  |  |
Corporate stocks, common | 64,527 |  |  | 64,527 |  |  | — |  |  | — |  |  |
Corporate stocks, preferred | 9,033 |  |  | 2,212 |  |  | 6,821 |  |  | — |  |  |
Mutual funds and other | 49,848 |  |  | 49,786 |  |  | 62 |  |  | — |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |
U.S. government | 48,439 |  |  | 31,389 |  |  | 17,050 |  |  | — |  |  | $ | 535 |
International government | 15,292 |  |  | — |  |  | 15,292 |  |  | — |  |  | 1,193 |
Municipals | 46,642 |  |  | — |  |  | 46,642 |  |  | — |  |  | 1,768 |
Corporate and other | 139,445 |  |  | 187 |  |  | 139,258 |  |  | — |  |  | 10,801 |
| $ | 388,832 |  |  | $ | 163,707 |  |  | $ | 225,125 |  |  | $ | — |  |  | $ | 14,297 |
Commodity derivative assets | $ | 2,596 |  |  | $ | — |  |  | $ | 2,596 |  |  | $ | — |  |  |
Commodity derivative liabilities | (2,596 | ) |  | — |  |  | (2,596 | ) |  | — |  |  |
Net | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |
December 31, 2018 |  |  |  |  |  |  |
Cash and cash equivalents | $ | 11,472 |  |  | $ | 11,472 |  |  | $ | — |  |  | $ | — |  |  |
Equity securities: |  |  |  |  |  |  |  |  |
Corporate stocks, common | 32,997 |  |  | 32,997 |  |  | — |  |  | — |  |  |  |
Corporate stocks, preferred | 7,258 |  |  | 1,654 |  |  | 5,604 |  |  | — |  |  |  |
Mutual funds and other | 70,777 |  |  | 70,777 |  |  | — |  |  | — |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |
U.S. government | 29,503 |  |  | 18,662 |  |  | 10,841 |  |  | — |  |  | $ | 1,098 |
International government | 8,435 |  |  | — |  |  | 8,435 |  |  | — |  |  | 90 |
Municipals | 53,642 |  |  | — |  |  | 53,642 |  |  | — |  |  | 489 |
Corporate and other | 114,158 |  |  | 588 |  |  | 111,414 |  |  | 2,156 |  |  | 923 |
| $ | 328,242 |  |  | $ | 136,150 |  |  | $ | 189,936 |  |  | $ | 2,156 |  |  | $ | 2,600 |
Commodity derivative assets | $ | 3,594 |  |  | $ | — |  |  | $ | 3,594 |  |  | $ | — |  |  |
Commodity derivative liabilities | (3,688 | ) |  | — |  |  | (3,688 | ) |  | — |  |  |
Net | $ | (94 | ) |  | $ | — |  |  | $ | (94 | ) |  | $ | — |  |  |
Summary of Carrying Amounts and Fair Value of Instruments | The carrying amounts and fair values of long-term debt, which are not recorded at fair value on the Consolidated Balance Sheets are presented below:
|  |  |  |  | GAAP Fair Value Hierarchy
| Carrying Amount |  | Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
December 31, 2019 | (In thousands)
PNMR | $ | 3,007,717 |  |  | $ | 3,142,704 |  |  | $ | — |  |  | $ | 3,142,074 |  |  | $ | — |
PNM | $ | 1,748,020 |  |  | $ | 1,795,149 |  |  | $ | — |  |  | $ | 1,795,149 |  |  | $ | — |
TNMP | $ | 670,691 |  |  | $ | 753,317 |  |  | $ | — |  |  | $ | 753,317 |  |  | $ | — |
December 31, 2018 |  |  |  |  |  |  |  |  |
PNMR | $ | 2,670,111 |  |  | $ | 2,703,810 |  |  | $ | — |  |  | $ | 2,703,810 |  |  | $ | — |
PNM | $ | 1,656,490 |  |  | $ | 1,668,736 |  |  | $ | — |  |  | $ | 1,668,736 |  |  | $ | — |
TNMP | $ | 575,398 |  |  | $ | 597,236 |  |  | $ | — |  |  | $ | 597,236 |  |  | $ | — |
Schedule of Investments Held by the Employee Benefit Plans | The fair values of investments held by the employee benefit plans are as follows:
|  |  | GAAP Fair Value Hierarchy
| Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
December 31, 2019 |  |  | (In thousands) |  |
PNM Pension Plan |  |  |  |  |  |  |
Participation in PNMR Master Trust Investments: |  |  |  |  |  |  |
Investments categorized within fair value hierarchy | $ | 445,984 |  |  | $ | 152,158 |  |  | $ | 293,826 |  |  | $ | — |
Uncategorized investments | 86,675 |  |  |  |  |  |  |
Total Master Trust Investments | $ | 532,659 |  |  |  |  |  |  |
TNMP Pension Plan |  |  |  |  |  |  |
Participation in PNMR Master Trust Investments: |  |  |  |  |  |  |
Investments categorized within fair value hierarchy | $ | 49,353 |  |  | $ | 17,335 |  |  | $ | 32,018 |  |  | $ | — |
Uncategorized investments | 9,974 |  |  |  |  |  |  |
Total Master Trust Investments | $ | 59,327 |  |  |  |  |  |  |
PNM OPEB Plan |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,022 |  |  | $ | 1,022 |  |  | $ | — |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |
Mutual funds | 85,727 |  |  | 39,361 |  |  | 46,366 |  |  | — |
| $ | 86,749 |  |  | $ | 40,383 |  |  | $ | 46,366 |  |  | $ | — |
TNMP OPEB Plan |  |  |  |  |  |  |
Cash and cash equivalents | $ | 275 |  |  | $ | 275 |  |  | $ | — |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |
Mutual funds | 10,635 |  |  | 4,075 |  |  | 6,560 |  |  | — |
| $ | 10,910 |  |  | $ | 4,350 |  |  | $ | 6,560 |  |  | $ | — |
|  |  | GAAP Fair Value Hierarchy
| Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
December 31, 2018 | (In thousands)
PNM Pension Plan |  |  |  |  |  |  |
Participation in PNMR Master Trust Investments: |  |  |  |  |  |  |
Investments categorized within fair value hierarchy | $ | 412,790 |  |  | $ | 139,673 |  |  | $ | 272,829 |  |  | $ | 288 |
Uncategorized investments | 76,874 |  |  |  |  |  |  |
Total Master Trust Investments | $ | 489,664 |  |  |  |  |  |  |
TNMP Pension Plan |  |  |  |  |  |  |
Participation in PNMR Master Trust Investments: |  |  |  |  |  |  |
Investments categorized within fair value hierarchy | $ | 45,283 |  |  | $ | 15,149 |  |  | $ | 30,101 |  |  | $ | 33 |
Uncategorized investments | 9,378 |  |  |  |  |  |  |
Total Master Trust Investments | $ | 54,661 |  |  |  |  |  |  |
PNM OPEB Plan |  |  |  |  |  |  |
Cash and cash equivalents | $ | 190 |  |  | $ | 190 |  |  | $ | — |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |
Mutual funds | 69,513 |  |  | 32,325 |  |  | 37,188 |  |  | — |
| $ | 69,703 |  |  | $ | 32,515 |  |  | $ | 37,188 |  |  | $ | — |
TNMP OPEB Plan |  |  |  |  |  |  |
Cash and cash equivalents | $ | 66 |  |  | $ | 66 |  |  | $ | — |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |
Mutual funds | 8,725 |  |  | 3,723 |  |  | 5,002 |  |  | — |
| $ | 8,791 |  |  | $ | 3,789 |  |  | $ | 5,002 |  |  | $ | — |
The fair values of investments in the PNMR Master Trust are as follows:
|  |  | GAAP Fair Value Hierarchy
| Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
December 31, 2019 | (In thousands)
PNMR Master Trust |  |  |  |  |  |  |
Cash and cash equivalents | $ | 19,982 |  |  | $ | 19,982 |  |  | $ | — |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |
Corporate stocks, common | 68,497 |  |  | 68,497 |  |  | — |  |  | — |
Corporate stocks, preferred | 825 |  |  | — |  |  | 825 |  |  | — |
Mutual funds and other | 172,326 |  |  | — |  |  | 172,326 |  |  | — |
Fixed income securities: |  |  |  |  |  |  |
U.S. government | 90,970 |  |  | 81,014 |  |  | 9,956 |  |  | — |
International government | 5,411 |  |  | — |  |  | 5,411 |  |  | — |
Municipals | 6,980 |  |  | — |  |  | 6,980 |  |  | — |
Corporate and other | 130,346 |  |  | — |  |  | 130,346 |  |  | — |
Total investments categorized within fair value hierarchy | 495,337 |  |  | $ | 169,493 |  |  | $ | 325,844 |  |  | $ | — |
Uncategorized investments: |  |  |  |  |  |  |
Private equity funds | 15,827 |  |  |  |  |  |  |
Hedge funds | 47,618 |  |  |  |  |  |  |
Real estate funds | 33,204 |  |  |  |  |  |  |
| $ | 591,986 |  |  |  |  |  |  |
December 31, 2018 |
PNMR Master Trust |  |  |  |  |  |  |
Cash and cash equivalents | $ | 20,120 |  |  | $ | 20,120 |  |  | $ | — |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |
Corporate stocks, common | 54,270 |  |  | 54,270 |  |  | — |  |  | — |
Corporate stocks, preferred | 874 |  |  | — |  |  | 874 |  |  | — |
Mutual funds and other | 143,517 |  |  | — |  |  | 143,517 |  |  | — |
Fixed income securities: |  |  |  |  |  |  |
U.S. government | 84,459 |  |  | 80,482 |  |  | 3,977 |  |  | — |
International government | 5,721 |  |  | — |  |  | 5,721 |  |  | — |
Municipals | 9,558 |  |  | — |  |  | 9,558 |  |  | — |
Corporate and other | 139,554 |  |  | (50 | ) |  | 139,283 |  |  | 321 |
Total investments categorized within fair value hierarchy | 458,073 |  |  | $ | 154,822 |  |  | $ | 302,930 |  |  | $ | 321 |
Uncategorized investments: |  |  |  |  |  |  |
Private equity funds | 18,021 |  |  |  |  |  |  |
Hedge funds | 45,589 |  |  |  |  |  |  |
Real estate funds | 22,642 |  |  |  |  |  |  |
| $ | 544,325 |  |  |  |  |  |  |
Summary of Level 3 Measurements | A reconciliation of the changes in Level 3 fair value measurements is as follows:
| Fixed Income - Corporate
PNMR Master Trust | PNM Pension |  | TNMP Pension |  | Total Master Trust
| (In thousands)
Balance at December 31, 2017 | $ | 191 |  |  | $ | 21 |  |  | $ | 212 |
Actual return on assets sold during the period | (7 | ) |  | (1 | ) |  | (8 | )
Actual return on assets still held at period end | (1 | ) |  | — |  |  | (1 | )
Purchases | 192 |  |  | 23 |  |  | 215 |
Sales | (87 | ) |  | (10 | ) |  | (97 | )
Balance at December 31, 2018 | 288 |  |  | 33 |  |  | 321 |
Actual return on assets sold during the period | (48 | ) |  | (5 | ) |  | (53 | )
Actual return on assets still held at period end | — |  |  | — |  |  | — |
Purchases | 133 |  |  | 15 |  |  | 148 |
Sales | (373 | ) |  | (43 | ) |  | (416 | )
Balance at December 31, 2019 | $ | — |  |  | $ | — |  |  | $ | — |
The following table presents information about the PBO, fair value of plan assets, and funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
PBO at beginning of year | $ | 564,258 |  |  | $ | 623,983 |  |  | $ | 60,587 |  |  | $ | 68,423 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 25,175 |  |  | 24,270 |  |  | 2,686 |  |  | 2,625 |
Actuarial (gain) loss | 61,151 |  |  | (41,025 | ) |  | 7,889 |  |  | (5,216 | )
Benefits paid | (44,839 | ) |  | (42,970 | ) |  | (5,588 | ) |  | (5,245 | )
PBO at end of year | 605,745 |  |  | 564,258 |  |  | 65,574 |  |  | 60,587 |
Fair value of plan assets at beginning of year | 489,978 |  |  | 562,016 |  |  | 55,074 |  |  | 63,499 |
Actual return on plan assets | 86,328 |  |  | (29,068 | ) |  | 9,881 |  |  | (3,180 | )
Employer contributions | — |  |  | — |  |  | — |  |  | — |
Benefits paid | (44,839 | ) |  | (42,970 | ) |  | (5,588 | ) |  | (5,245 | )
Fair value of plan assets at end of year | 531,467 |  |  | 489,978 |  |  | 59,367 |  |  | 55,074 |
Funded status – asset (liability) for pension benefits | $ | (74,278 | ) |  | $ | (74,280 | ) |  | $ | (6,207 | ) |  | $ | (5,513 | )
The following table presents information about the APBO, the fair value of plan assets, and the funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (In thousands)
APBO at beginning of year | $ | 75,305 |  |  | $ | 89,897 |  |  | $ | 10,064 |  |  | $ | 12,279 |
Service cost | 53 |  |  | 83 |  |  | 50 |  |  | 134 |
Interest cost | 3,316 |  |  | 3,439 |  |  | 451 |  |  | 477 |
Participant contributions | 2,131 |  |  | 2,390 |  |  | 316 |  |  | 174 |
Actuarial (gain) loss | 2,587 |  |  | (12,206 | ) |  | 1,004 |  |  | (2,213 | )
Benefits paid | (8,271 | ) |  | (8,298 | ) |  | (650 | ) |  | (787 | )
APBO at end of year | 75,121 |  |  | 75,305 |  |  | 11,235 |  |  | 10,064 |
Fair value of plan assets at beginning of year | 69,703 |  |  | 80,356 |  |  | 8,744 |  |  | 10,002 |
Actual return on plan assets | 19,257 |  |  | (7,669 | ) |  | 2,434 |  |  | (988 | )
Employer contributions | 3,580 |  |  | 2,924 |  |  | — |  |  | 343 |
Participant contributions | 2,131 |  |  | 2,390 |  |  | 316 |  |  | 174 |
Benefits paid | (8,271 | ) |  | (8,298 | ) |  | (650 | ) |  | (787 | )
Fair value of plan assets at end of year | 86,400 |  |  | 69,703 |  |  | 10,844 |  |  | 8,744 |
Funded status – asset (liability) | $ | 11,279 |  |  | $ | (5,602 | ) |  | $ | (391 | ) |  | $ | (1,320 | )

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