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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
Pension Plan
OPEB Plan
Executive Retirement Program
202520242025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
5,385 5,427 567 597 122 124 
Expected return on plan assets
(7,458)(7,757)(1,384)(1,391)— — 
Amortization of net loss
3,123 2,661 — — 47 50 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,050 $331 $(817)$(794)$169 $174 
The following table presents the components of the TNMP Plans’ net periodic benefit cost:

Three Months Ended March 31,
Pension Plan
OPEB Plan
Executive Retirement Program
202520242025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $4 $5 $— $— 
Interest cost
536 553 93 96 — 4 
Expected return on plan assets
(733)(687)(120)(129)— — 
Amortization of net (gain) loss
168 139 (124)(161)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$(29)$5 $(147)$(189)$— $4