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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
Pension Plan
OPEB Plan
Executive Retirement Program
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
5,427 5,913 597 676 124 135 
Expected return on plan assets
(7,757)(7,299)(1,391)(1,243)— — 
Amortization of net loss
2,661 2,646 — — 50 38 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$331 $1,260 $(794)$(567)$174 $173 
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
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