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Pension and Other Postretirement Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2023
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
202320222023202220232022
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $$— $— 
Interest cost
5,913 4,215 675 479 135 90 
Expected return on plan assets
(7,299)(7,140)(1,242)(1,088)— — 
Amortization of net loss
2,646 3,948 — — 38 81 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,260 $1,023 $(567)$(607)$173 $171 
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202320222023202220232022
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $$— $— 
Interest cost
17,740 12,643 2,027 1,437 405 270 
Expected return on plan assets
(21,897)(21,422)(3,727)(3,264)— — 
Amortization of net loss
7,937 11,846 — — 114 245 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$3,780 $3,067 $(1,700)$(1,821)$519 $515 
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
202320222023202220232022
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $$$— $— 
Interest cost
601 430 106 77 
Expected return on plan assets
(674)(618)(120)(104)— — 
Amortization of net (gain) loss
110 233 (190)(130)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$37 $45 $(199)$(148)$$
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202320222023202220232022
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $16 $27 $— $— 
Interest cost
1,802 1,290 319 231 
Expected return on plan assets
(2,023)(1,854)(361)(312)— — 
Amortization of net (gain) loss
329 699 (570)(390)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$108 $135 $(596)$(444)$$