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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2024
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
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
5,427 5,913 597 675 124 135 
Expected return on plan assets
(7,758)(7,299)(1,391)(1,242)— — 
Amortization of net loss
2,661 2,646 — — 50 38 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$330 $1,260 $(794)$(567)$174 $173 
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
16,282 17,740 1,791 2,027 372 405 
Expected return on plan assets
(23,272)(21,897)(4,173)(3,727)— — 
Amortization of net loss
7,984 7,937 — — 150 114 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$994 $3,780 $(2,382)$(1,700)$522 $519 
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
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $5 $5 $— $— 
Interest cost
553 601 96 106 4 3 
Expected return on plan assets
(687)(674)(129)(120)— — 
Amortization of net (gain) loss
139 110 (161)(190)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$5 $37 $(189)$(199)$4 $3 
Nine Months Ended September 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $16 $16 $— $— 
Interest cost
1,660 1,802 289 319 12 9 
Expected return on plan assets
(2,061)(2,023)(386)(361)— — 
Amortization of net (gain) loss
417 329 (482)(570)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$16 $108 $(563)$(596)$12 $9