v3.26.1
Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Components of net periodic postretirement benefit expense (income) for the three months ended March 31, 2026 and 2025 were as follows:
Basin Electric and
Subsidiaries		Coteau
2026202520262025
(In thousands)
Service cost$319 $292 $3 $5 
Interest cost258 233 13 16 
Amortization of prior service cost58 58 — — 
Amortization of net actuarial gain(412)(459)(110)(169)
Net periodic expense (income)$223 $124 $(94)$(148)
Components of net periodic pension expense (income) for the three months ended March 31, 2026 and 2025 were as follows:
BCSCoteau
2026202520262025
(In thousands)
Interest cost$32 $31 $— $904 
Expected return on assets(34)(35)— (1,027)
Amortization of net actuarial loss12 16 — — 
Settlements— — 45 — 
Net periodic expense (income)$10 $12 $45 $(123)