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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Postretirement Benefits Other Than Pensions
Tri-State sponsors three medical plans for all non-bargaining unit employees under the age of 65. Two of the plans provide postretirement medical benefits to full-time non-bargaining unit employees and retirees who receive benefits under those plans, who have attained age 55, and who elect to participate. All three of these non-bargaining unit medical plans offer post employment medical benefits to employees on long-term disability. The plans were unfunded as of March 31, 2026, are contributory (with retiree premium contributions equivalent to employee premiums, adjusted annually) and contain other cost-sharing features such as deductibles. As of June 30, 2021, the plans ceased to provide postretirement medical benefits for employees who retire after June 30, 2021.
The postretirement medical benefit and post employment medical benefit obligations are determined annually (during the fourth quarter) by an independent actuary and are included in accumulated postretirement benefit and post employment obligations on Tri-State's consolidated statements of financial position as follows (dollars in thousands):
Three Months Ended March 31, 2026
Postretirement medical benefit obligation at beginning of period$347 
Interest cost6 
Benefit payments (net of contributions by participants)(57)
Postretirement medical benefit obligation at end of period$296 
Postemployment medical benefit obligation at end of period99 
Total postretirement and postemployment medical obligations at end of period$395 
The service cost component of Tri-State's net periodic benefit cost, if any, is included in operating expenses on its consolidated statements of operations. The components of net periodic benefit cost other than the service cost component are included in other income (expense) on Tri-State's consolidated statements of operations.
In accordance with the accounting standard related to postretirement benefits other than pensions, actuarial gains and losses are not recognized in income but are instead recorded in accumulated other income on Tri-State's consolidated statements of financial position. If the unrecognized amount is in excess of 10 percent of the projected benefit obligation, amounts are reclassified out of accumulated other comprehensive income and included in net income as the excess is amortized over the average remaining service lives of the active plan participants. Unrecognized actuarial gains and losses have been determined per actuarial studies for the postretirement medical benefit obligation.
The net unrecognized actuarial gains and losses related to the postretirement medical benefit obligations are included in accumulated other comprehensive income as follows (dollars in thousands):
Three Months Ended March 31, 2026
Amounts included in accumulated other comprehensive income at beginning of period$161 
Amortization of prior service credit into other income— 
Amounts included in accumulated other comprehensive income at end of period$161 
Defined Benefit Plans
Tri-State participates in the NRECA Pension Restoration Plan and the NRECA Executive Benefit Restoration Plan, both of which are intended to provide a supplemental benefit to the defined benefit plan for an eligible group of highly compensated employees. Eligible employees include the Chief Executive Officer and any other employees that become eligible. All of Tri-State's executive employees with a hire date prior to May 1, 2021 participate in one of the following pension restoration plans: the NRECA Pension Restoration Plan or the NRECA Executive Benefit Restoration Plan. Eligibility is determined annually and is based on January 1 base salary that exceeds the limits of the defined benefit plan. Employees hired May 1, 2021 or later are not eligible for either plan.
The NRECA Executive Benefit Restoration Plan obligations are determined annually (during the first quarter of the subsequent year) by an NRECA actuary and are included in accumulated postretirement benefit and post employment obligations on Tri-State's consolidated statements of financial position as follows (dollars in thousands):
Three Months Ended March 31, 2026
Executive benefit restoration obligation at beginning of period$8,534 
Service cost125 
Interest cost106 
Executive benefit restoration at end of period$8,765 
Fair value of plan assets at beginning of period$10,360 
Actual return on plan assets46 
Fair value of plan assets at end of period$10,406 
Net asset at end of period$1,641 
The service cost component of Tri-State's net periodic benefit cost is included in operating expenses on its consolidated statements of operations. The components of net periodic benefit cost other than the service cost component are included in other income (expense) on Tri-State's consolidated statements of operations. Tri-State has an irrevocable trust with an independent third party to fund the NRECA Executive Benefit Restoration Plan. The trust is funded quarterly to the prior year obligation as determined by the NRECA actuary.
In accordance with the accounting standard related to defined benefit pension plans, actuarial gains and losses are not recognized in income but are instead recorded in accumulated other income on Tri-State's consolidated statements of financial position. If the unrecognized amount is in excess of 10 percent of the projected benefit obligation, amounts are reclassified out of accumulated other comprehensive income and included in net income as the excess is amortized over the average remaining service lives of the active plan participants. Unrecognized actuarial gains and losses have been determined per actuarial studies for the executive benefit restoration obligation.
The net unrecognized actuarial gains and losses related to the executive benefit restoration obligations are included in accumulated other comprehensive income as follows (dollars in thousands):
Three Months Ended March 31, 2026
Accumulated other comprehensive loss at beginning of period$1,368 
Amortization of prior service cost into other income81 
Accumulated other comprehensive loss at end of period$1,449