EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2026

Schedule of Employee Benefit Plan Obligations

The postretirement medical benefit and post employment medical benefit obligations are determined annually (during the fourth quarter) by an independent actuary. The postretirement medical benefit and post employment medical benefit obligations are included in accumulated postretirement benefit and post employment obligations on Tri-State's consolidated statements of financial position as follows (dollars in thousands):


	Nine Months Ended September 30, 2026
Postretirement medical benefit obligation at beginning of period	$	347

Interest cost	16
Benefit payments (net of contributions by participants)	(170)


Postretirement medical benefit obligation at end of period	$	193
Postemployment medical benefit obligation at end of period	99
Total postretirement and postemployment medical obligations at end of period	$	292

The NRECA Executive Benefit Restoration Plan obligations are determined annually (during the first quarter of the subsequent year) by an NRECA actuary. The executive benefit restoration obligation is included in accumulated postretirement benefit and post employment obligations on Tri-State's consolidated statements of financial position as follows (dollars in thousands):


	Nine Months Ended September 30, 2026
Executive benefit restoration obligation at beginning of period	$	8,534
Service cost	375
Interest cost	319




Executive benefit restoration at end of period	$	9,228
Fair value of plan assets at beginning of period	$	10,360


Actual return on plan assets	35
Fair value of plan assets at end of period	$	10,395
Net asset at end of period	$	1,167

Schedule of Net Unrecognized Actuarial Gains and Losses on Employee Benefit Plan Obligations

The net unrecognized actuarial gain related to the postretirement medical benefit obligations is included in accumulated other comprehensive income as follows (dollars in thousands):


	Nine Months Ended September 30, 2026
Amounts included in accumulated other comprehensive income at beginning of period	$	161

Amortization of actuarial gain into other income	(100)


Amounts included in accumulated other comprehensive income at end of period	$	61

The net unrecognized actuarial gain and prior service cost related to the executive benefit restoration obligations are included in accumulated other comprehensive income as follows (dollars in thousands):


	Nine Months Ended September 30, 2026
Prior service cost at beginning of period	$	(1,176)
Amortization of prior service cost into other income	238
Prior service cost at end of period	$	(938)
Unrecognized actuarial gain at beginning of period	$	2,545
Amortization of actuarial gain	(235)
Unrecognized actuarial gain at end of period	$	2,310


Accumulated other comprehensive income at end of period	$	1,372

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost for the nine months ended September 30, 2026 are as follows (dollars in thousands):


	Postretirement Benefits		Executive Benefit Restoration		Total Periodic Benefit Cost
Service cost	$	—	$	375	$	375
Interest cost	16		319		335
Amortization of prior service cost	—		238		238
Amortization of actuarial gain	(100)		(235)		(335)
Net periodic benefit cost	$	(84)	$	697	$	613