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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2023
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
202320222023202220232022
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $2 $— $— 
Interest cost
5,913 4,214 676 479 135 90 
Expected return on plan assets
(7,299)(7,141)(1,243)(1,088)— — 
Amortization of net loss
2,646 3,949 — — 38 82 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,260 $1,022 $(567)$(607)$173 $172 
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
202320222023202220232022
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $5 $9 $— $— 
Interest cost
601 430 106 77 3 3 
Expected return on plan assets
(674)(618)(120)(104)— — 
Amortization of net (gain) loss
110 233 (190)(130)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$37 $45 $(199)$(148)$3 $3