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Pension and Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2022
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
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $$$— $— 
Interest cost
4,214 4,036 479 477 90 90 
Expected return on plan assets
(7,141)(7,133)(1,088)(1,042)— — 
Amortization of net loss
3,949 4,541 — — 82 100 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,022 $1,444 $(607)$(559)$172 $190 
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
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $$11 $— $— 
Interest cost
430 435 77 77 
Expected return on plan assets
(618)(795)(104)(102)— — 
Amortization of net (gain) loss
233 312 (130)(80)— 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$45 $(48)$(148)$(94)$$13