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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following table presents the components of the PNM Plans’ net periodic benefit cost:

Three Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $2 $5 $— $— 
Interest cost
4,215 4,036 479 476 90 90 
Expected return on plan assets
(7,140)(7,133)(1,088)(1,042)— — 
Amortization of net loss
3,948 4,541 — — 81 99 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,023 $1,444 $(607)$(561)$171 $189 
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $6 $18 $— $— 
Interest cost
12,643 12,107 1,437 1,430 270 271 
Expected return on plan assets
(21,422)(21,398)(3,264)(3,125)— — 
Amortization of net loss
11,846 13,624 — — 245 296 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$3,067 $4,333 $(1,821)$(1,677)$515 $567 
The following table presents the components of the TNMP Plans’ net periodic benefit cost:

Three Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $9 $12 $— $— 
Interest cost
430 435 77 77 2 4 
Expected return on plan assets
(618)(795)(104)(101)— — 
Amortization of net (gain) loss
233 311 (130)(81)— 8 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$45 $(49)$(148)$(93)$2 $12 
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $27 $34 $— $— 
Interest cost
1,290 1,306 231 231 8 13 
Expected return on plan assets
(1,854)(2,386)(312)(304)— — 
Amortization of net (gain) loss
699 935 (390)(242)— 25 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$135 $(145)$(444)$(281)$8 $38