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Fair Value of Derivative and Other Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2022
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 and considered Level 2 fair value measurements, are presented in the following line items on the Consolidated Balance Sheets: 
 Economic Hedges
 December 31,
 20222021
 (In thousands)
Other current assets$9,780 $684 
Other deferred charges— — 
9,780 684 
Other current liabilities(19,209)(2,275)
Other deferred credits— — 
(19,209)(2,275)
Net$(9,429)$(1,591)
Schedule of Realized Gain (Loss) Gains and losses recognized on the Consolidated Statements of Earnings related to investment securities in the NDT and reclamation trusts are presented in the following table:
Year ended December 31,
202220212020
(In thousands)
Equity securities:
Net gains (losses) from equity securities sold$(6,940)$8,738 $5,861 
Net gains (losses) from equity securities still held
(38,025)(442)17,707 
Total net gains (losses) on equity securities(44,965)8,296 23,568 
Available-for-sale debt securities:
Net gains (losses) on debt securities(33,392)8,554 (1,969)
Net gains (losses) on investment securities$(78,357)$16,850 $21,599 
Gross realized losses shown below exclude the (increase)/decrease in realized impairment losses of $(25.8) million, $0.7 million, and $(3.2) million for the years ended December 31, 2022, 2021 and 2020.

 Year Ended December 31,
 202220212020
 (In thousands)
Proceeds from sales$526,448 $459,867 $590,998 
Gross realized gains$22,071 $39,408 $35,904 
Gross realized (losses)$(36,623)$(22,815)$(28,817)
Investments Classified by Contractual Maturity Date
At December 31, 2022, the available-for-sale debt securities held by PNM, had the following final maturities:
 Fair Value
 (In thousands)
Within 1 year$40,339 
After 1 year through 5 years67,426 
After 5 years through 10 years70,608 
After 10 years through 15 years15,571 
After 15 years through 20 years12,825 
After 20 years32,211 
$238,980 
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
TotalQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs
(Level 2)
Unrealized Gains
(In thousands)
December 31, 2022
Cash and cash equivalents$66,843 $66,843 $— 
Equity securities:
Corporate stocks, common40,103 40,103 — 
Corporate stocks, preferred5,191 790 4,401 
Mutual funds and other66,359 66,359 — 
Available-for-sale debt securities:
U.S. government45,905 45,645 260 $1,334 
International government9,762 — 9,762 1,117 
Municipals43,136 — 43,136 1,062 
Corporate and other140,177 — 140,177 6,473 
$417,476 $219,740 $197,736 $9,986 
December 31, 2021
Cash and cash equivalents$7,895 $7,895 $— 
Equity securities:
Corporate stocks, common97,626 97,626 — 
Corporate stocks, preferred9,114 3,775 5,339 
Mutual funds and other75,285 75,241 44 
Available-for-sale debt securities:
U.S. government43,128 13,204 29,924 $214 
International government16,001 — 16,001 1,508 
Municipals47,050 — 47,050 1,807 
Corporate and other167,027 — 167,027 12,212 
$463,126 $197,741 $265,385 $15,741 
Summary of Carrying Amounts and Fair Value of Instruments
The carrying amounts and fair values of long-term debt, all of which are considered Level 2 fair value measurements and are not recorded at fair value on the Consolidated Balance Sheets are presented below:
 Carrying
Amount
Fair Value
December 31, 2022(In thousands)
PNMR$4,077,387 $3,726,195 
PNM$2,000,900 $1,789,186 
TNMP$1,076,875 $937,009 
December 31, 2021
PNMR$3,698,919 $3,915,010 
PNM$1,881,110 $1,975,987 
TNMP$918,050 $1,039,023 
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
TotalQuoted Prices in Active Markets for Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
December 31, 2022(In thousands)
PNM Pension Plan
Participation in PNMR Master Trust Investments:
Investments categorized within fair value hierarchy
$342,183 $143,911 $198,272 
Uncategorized investments
67,787 
Total Master Trust Investments$409,970 
TNMP Pension Plan
Participation in PNMR Master Trust Investments:
Investments categorized within fair value hierarchy
$38,617 $13,556 $25,061 
Uncategorized investments
5,433 
Total Master Trust Investments$44,050 
PNM OPEB Plan
Cash and cash equivalents$1,703 $1,703 $— 
Equity securities:
Mutual funds69,001 42,068 26,933 
$70,704 $43,771 $26,933 
TNMP OPEB Plan
Cash and cash equivalents$149 $149 $— 
Equity securities:
Mutual funds8,573 8,018 555 
$8,722 $8,167 $555 
GAAP Fair Value Hierarchy
TotalQuoted Prices in Active
Markets for Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
December 31, 2021(In thousands)
PNM Pension Plan
Participation in PNMR Master Trust Investments:
Investments categorized within fair value hierarchy$527,873 $235,605 $292,268 
Uncategorized investments49,432 
Total Master Trust Investments$577,305 
TNMP Pension Plan
Participation in PNMR Master Trust Investments:
Investments categorized within fair value hierarchy$58,623 $21,390 $37,233 
Uncategorized investments3,962 
Total Master Trust Investments$62,585 
PNM OPEB Plan
Cash and cash equivalents$1,578 $1,578 $— 
Equity securities:
Mutual funds94,549 58,383 36,166 
$96,127 $59,961 $36,166 
TNMP OPEB Plan
Cash and cash equivalents$381 $381 $— 
Equity securities:
Mutual funds12,249 11,575 674 
$12,630 $11,956 $674 

The fair values of investments in the PNMR Master Trust are as follows:
GAAP Fair Value Hierarchy
TotalQuoted Prices
in Active Markets for
Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
December 31, 2022(In thousands)
PNMR Master Trust
Cash and cash equivalents$17,106 $17,106 $— 
Equity securities:
Corporate stocks, common53,661 53,661 — 
Corporate stocks, preferred639 639 — 
Mutual funds and other135,200 27,412 107,788 
Fixed income securities:
U.S. government62,637 58,649 3,988 
International government3,318 — 3,318 
Municipals4,922 — 4,922 
Corporate and other103,317 — 103,317 
Total investments categorized within fair value hierarchy
380,800 $157,467 $223,333 
Uncategorized investments:
Private equity funds6,691 
Hedge funds33,258 
Real estate funds33,271 
$454,020 
GAAP Fair Value Hierarchy
TotalQuoted Prices
in Active Markets for
Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
December 31, 2021(In thousands)
PNMR Master Trust
Cash and cash equivalents$18,924 $18,924 $— 
Equity securities:
Corporate stocks, common92,484 92,484 — 
Corporate stocks, preferred806 — 806 
Mutual funds and other222,106 59,203 162,903 
Fixed income securities:
U.S. government95,429 86,384 9,045 
International government5,977 — 5,977 
Municipals6,143 — 6,143 
Corporate and other144,627 — 144,627 
Total investments categorized within fair value hierarchy
586,496 $256,995 $329,501 
Uncategorized investments:
Private equity funds10,479 
Hedge funds8,913 
Real estate funds34,002 
$639,890