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Pension Plans and Other Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits, Description [Abstract] |
Pension Plans and Other Postretirement Benefit Plans | NOTE 6. PENSION PLANS AND OTHE R POSTRETIREMENT BENEFIT PLANS Avista Utilities The Company contributed $7 million in cash to the pension plan for the six months ended June 30, 2025. The Company expects to contribute $10 million in 2025. The Company uses a December 31 measurement date for its defined benefit pension and other postretirement benefit plans. The following table sets forth the components of net periodic benefit costs for the three and six months ended June 30 (dollars in millions):
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Three months ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 4 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 9 |  |  |  | 8 |  |  |  | 1 |  |  |  | 2 |
Expected return on plan assets |  |  | (11 | ) |  |  | (11 | ) |  |  | (1 | ) |  |  | (1 | )
Amortization of prior service cost (credit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Net loss recognition |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 2 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 1 |
Six months ended June 30: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 8 |  |  | $ | 8 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 18 |  |  |  | 17 |  |  |  | 3 |  |  |  | 4 |
Expected return on plan assets |  |  | (22 | ) |  |  | (23 | ) |  |  | (2 | ) |  |  | (2 | )
Amortization of prior service cost (credit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Net loss recognition |  |  | 1 |  |  |  | 2 |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 5 |  |  | $ | 4 |  |  | $ | 2 |  |  | $ | 2 |
Total service costs in the table above are recorded to the same accounts as labor expense. Labor and benefits expense is recorded to various projects based on whether the work is a capital project or an operating expense. Approximately 45 percent of all labor and benefits is capitalized to utility property and 55 percent is expensed to utility other operating expenses. The non-service portion of costs in the table above are recorded to other expense below income from operations in the Condensed Consolidated Statements of Income and Comprehensive Income or capitalized as a regulatory asset. Approximately 45 percent of the costs are capitalized to regulatory assets and 55 percent is expensed to the income statement.

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