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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2025
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 June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202520242025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
5,385 5,428 566 597 122 124 
Expected return on plan assets
(7,459)(7,757)(1,384)(1,391)— — 
Amortization of net loss
3,124 2,662 — — 47 50 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,050 $333 $(818)$(794)$169 $174 
Six Months Ended June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202520242025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
10,770 10,855 1,133 1,194 244 248 
Expected return on plan assets
(14,917)(15,514)(2,768)(2,782)— — 
Amortization of net loss
6,247 5,323 — — 94 100 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$2,100 $664 $(1,635)$(1,588)$338 $348 
The following table presents the components of the TNMP Plans’ net periodic benefit cost:

Three Months Ended June 30,
Pension Plan
OPEB Plan
2025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $4 $6 
Interest cost
536 554 93 97 
Expected return on plan assets
(733)(687)(120)(128)
Amortization of net (gain) loss
168 139 (124)(160)
Amortization of prior service cost
— — — — 
Net Periodic Benefit Cost (Income)
$(29)$6 $(147)$(185)
Six Months Ended June 30,
Pension Plan
OPEB Plan
2025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $8 $11 
Interest cost
1,072 1,107 186 193 
Expected return on plan assets
(1,466)(1,374)(240)(257)
Amortization of net (gain) loss
336 278 (248)(321)
Amortization of prior service cost
— — — — 
Net Periodic Benefit Cost (Income)
$(58)$11 $(294)$(374)