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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202520242025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
5,385 5,427 567 597 121 124 
Expected return on plan assets
(7,459)(7,758)(1,384)(1,391)— — 
Amortization of net loss
3,124 2,661 — — 47 50 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,050 $330 $(817)$(794)$168 $174 
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202520242025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
16,154 16,282 1,700 1,791 365 372 
Expected return on plan assets
(22,375)(23,272)(4,152)(4,173)— — 
Amortization of net loss
9,371 7,984 — — 141 150 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$3,150 $994 $(2,452)$(2,382)$506 $522 
The following table presents the components of the TNMP Plans’ net periodic benefit cost:

Three Months Ended September 30,
Pension Plan
OPEB Plan
2025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $4 $5 
Interest cost
536 553 94 96 
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 $(146)$(189)
Nine Months Ended September 30,
Pension Plan
OPEB Plan
2025202420252024
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $13 $16 
Interest cost
1,608 1,660 280 289 
Expected return on plan assets
(2,199)(2,061)(361)(386)
Amortization of net (gain) loss
504 417 (372)(482)
Amortization of prior service cost
— — — — 
Net Periodic Benefit Cost (Income)
$(87)$16 $(440)$(563)