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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $2 $7 $— $— 
Interest cost
4,214 4,035 479 477 90 91 
Expected return on plan assets
(7,141)(7,132)(1,088)(1,041)— — 
Amortization of net loss
3,949 4,542 — — 82 97 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$1,022 $1,445 $(607)$(557)$172 $188 
Six Months Ended June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $4 $13 $— $— 
Interest cost
8,428 8,071 958 954 180 181 
Expected return on plan assets
(14,282)(14,265)(2,176)(2,083)— — 
Amortization of net loss
7,898 9,083 — — 164 197 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$2,044 $2,889 $(1,214)$(1,116)$344 $378 
The following table presents the components of the TNMP Plans’ net periodic benefit cost:

Three Months Ended June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $9 $11 $— $— 
Interest cost
430 436 77 77 3 5 
Expected return on plan assets
(618)(796)(104)(101)— — 
Amortization of net (gain) loss
233 312 (130)(81)— 8 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$45 $(48)$(148)$(94)$3 $13 
Six Months Ended June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202220212022202120222021
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $18 $22 $— $— 
Interest cost
860 871 154 154 6 9 
Expected return on plan assets
(1,236)(1,591)(208)(203)— — 
Amortization of net (gain) loss
466 624 (260)(161)— 17 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$90 $(96)$(296)$(188)$6 $26