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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
5,428 5,914 597 676 124 135 
Expected return on plan assets
(7,757)(7,299)(1,391)(1,243)— — 
Amortization of net loss
2,662 2,645 — — 50 38 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$333 $1,260 $(794)$(567)$174 $173 
Six Months Ended June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $— $— $— $— 
Interest cost
10,855 11,827 1,194 1,352 248 270 
Expected return on plan assets
(15,514)(14,598)(2,782)(2,485)— — 
Amortization of net loss
5,323 5,291 — — 100 76 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$664 $2,520 $(1,588)$(1,133)$348 $346 
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
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $6 $6 $— $— 
Interest cost
554 600 97 107 4 3 
Expected return on plan assets
(687)(675)(128)(121)— — 
Amortization of net (gain) loss
139 109 (160)(190)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$6 $34 $(185)$(198)$4 $3 
Six Months Ended June 30,
Pension Plan
OPEB Plan
Executive Retirement Program
202420232024202320242023
(In thousands)
Components of Net Periodic Benefit Cost
Service cost
$— $— $11 $11 $— $— 
Interest cost
1,107 1,201 193 213 8 6 
Expected return on plan assets
(1,374)(1,349)(257)(241)— — 
Amortization of net (gain) loss
278 219 (321)(380)— — 
Amortization of prior service cost
— — — — — — 
Net Periodic Benefit Cost (Income)
$11 $71 $(374)$(397)$8 $6