| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|---|
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
|---|
| Utility revenues | 1,963.00 | 1,937.00 | 1,751.00 | 1,709.52 | 1,438.37 | 1,320.28 | 1,333.14 | 1,369.57 | 1,423.39 | 1,418.91 |
| Non-utility energy marketing and trading revenues | 1.00 | 1.00 | -- | -- | -- | -- | -- | -- | -- | 23.57 |
| Operating Revenues:Ecova revenues | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other non-utility revenues | -- | -- | 0.56 | 0.69 | 0.57 | 1.61 | 12.48 | 27.33 | 22.54 | -- |
| Total revenues | 1,964.00 | 1,938.00 | 1,751.55 | 1,710.21 | 1,438.94 | 1,321.89 | 1,345.62 | 1,396.89 | 1,445.93 | 1,442.48 |
| Operations and maintenance | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Utility operating expenses: Resource costs | 691.00 | 798.00 | 702.37 | 735.86 | 497.12 | 398.51 | 439.82 | 494.74 | 524.57 | 551.37 |
| Non-utility operating expenses: Resource costs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Utility operating expenses: Depreciation and amortization | -- | -- | 265.33 | 253.02 | 231.92 | 223.51 | 205.37 | 182.88 | 171.28 | 160.51 |
| Non-utility operating expenses: Depreciation and amortization | -- | -- | -- | 0.13 | 0.26 | 0.72 | 0.63 | 0.80 | 0.74 | 0.77 |
| Depreciation and amortization-Ecova | 289.00 | 274.00 | -- | -- | -- | -- | -- | -- | -- | -- |
| Administrative and general | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Utility operating expenses: Taxes other than income taxes | 121.00 | 116.00 | 109.72 | 114.19 | 109.35 | 106.50 | 105.65 | 107.30 | 106.75 | 98.74 |
| Acquisition costs | -- | -- | -- | -- | -- | -- | 19.68 | 3.72 | 14.62 | -- |
| Utility operating expenses: Other operating expenses | (504.00) | (442.00) | (413.61) | -- | (366.13) | (354.61) | (345.21) | (318.27) | (317.81) | (315.80) |
| Non-utility operating expenses: Other operating expenses | (5.00) | (2.00) | (2.84) | (11.60) | (5.93) | (5.34) | (18.88) | (28.08) | (25.65) | (25.50) |
| Gain on sale of utility properties | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other operating expenses-Ecova | -- | -- | -- | (405.17) | -- | -- | -- | -- | -- | -- |
| Total Operating Expenses | 1,610.00 | 1,632.00 | 1,493.86 | 1,519.97 | 1,210.70 | 1,089.19 | 1,135.23 | 1,135.78 | 1,161.42 | 1,152.68 |
| Income from operations | 354.00 | 306.00 | 257.69 | 190.24 | 228.23 | 232.70 | 210.39 | 261.11 | 284.51 | 289.80 |
| Interest expense | 152.00 | 147.00 | 140.80 | 117.63 | 105.73 | 104.35 | 103.01 | 99.72 | 95.36 | 86.50 |
| Capitalized interest | (6.00) | (5.00) | (3.63) | (3.72) | (3.99) | (4.08) | (4.17) | (3.94) | (3.31) | (2.65) |
| Interest expense to affiliated trusts | 2.00 | 3.00 | 2.50 | 1.06 | 0.42 | 0.71 | 1.34 | 1.22 | 0.83 | 0.63 |
| Merger termination fee | -- | -- | -- | -- | -- | -- | 103.00 | -- | -- | -- |
| Other income - net | 11.00 | 22.00 | 19.53 | 62.72 | 33.30 | 4.82 | 14.93 | (1.46) | 7.06 | 10.08 |
| Regulatory disallowance of unamortized debt repurchase costs | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Pre-Tax Income | 217.00 | 183.00 | 137.55 | 137.99 | 159.37 | 136.54 | 228.14 | 162.66 | 198.69 | 215.40 |
| Provision for Income taxes | 24.00 | 3.00 | (33.63) | (17.19) | 12.03 | 7.05 | 31.37 | 26.06 | 82.76 | 78.09 |
| Federal income taxes at statutory rates | -- | -- | -- | -- | 33.47 | 28.67 | 47.91 | 34.16 | 69.54 | 75.39 |
| Tax effect of regulatory treatment of utility plant differences | -- | -- | -- | -- | (13.82) | (12.89) | (9.97) | (8.15) | 3.48 | 3.30 |
| State income tax expense | -- | -- | -- | -- | 1.39 | 0.81 | 1.47 | 1.19 | 1.11 | 1.32 |
| Preferred dividends | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Settlement of prior year tax returns and adjustment of tax reserves | -- | -- | -- | -- | -- | (1.19) | 0.64 | (0.14) | (0.38) | 0.01 |
| Manufacturing deduction | -- | -- | -- | -- | -- | -- | -- | -- | (1.12) | -- |
| Kettle Falls tax credit | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other-net | -- | -- | -- | -- | (0.32) | 0.12 | (0.88) | (0.34) | (1.09) | (0.33) |
| Avista Utilities | -- | -- | -- | -- | -- | -- | -- | -- | -- | (1.60) |
| Energy Marketing and Resource Management | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Avista Advantage | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Information and Technology | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Settlement of equity awards | -- | -- | -- | -- | -- | (8.48) | 0.61 | (0.99) | (1.44) | -- |
| Acquisition costs | -- | -- | -- | -- | -- | -- | (1.71) | 0.33 | 2.49 | -- |
| Federal income tax rate change | -- | -- | -- | -- | -- | -- | -- | -- | 10.17 | -- |
| Income from continuing operations | -- | -- | -- | -- | -- | -- | -- | 136.60 | 115.93 | 137.32 |
| Less: Income from discontinued operations attributable to noncontrolling interest | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Asset impairment charges | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Minority interest | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income tax benefit | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Loss from operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Loss before asset impairment charges, minority interest and income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of accounting change | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Consolidated Net Income (Loss) | 193.00 | 180.00 | 171.18 | 155.18 | 147.33 | 129.49 | 196.76 | -- | 115.93 | 137.32 |
| Net income attributable to noncontrolling interests | -- | -- | -- | -- | -- | -- | (0.22) | 0.17 | 0.02 | 0.09 |
| Preferred Stock Dividend & Other Adjustments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (Loss) available to limited partners shareholders | 193.00 | 180.00 | 171.18 | 155.18 | 147.33 | 129.49 | 196.98 | 136.43 | 115.92 | 137.23 |
| Earnings Per Share (Basic) - Cont Ops | -- | -- | -- | -- | -- | -- | -- | -- | 1.80 | 2.16 |
| Earnings Per Share (Basic) - Disc Ops | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Basic) - Acc Change | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| NET EARNINGS PER SHARE (BASIC) | 2.38 | 2.29 | 2.24 | 2.13 | 2.11 | 1.91 | 2.98 | 2.08 | 1.80 | 2.16 |
| Earnings Per Share (Diluted) - Cont Ops | -- | -- | -- | -- | -- | -- | -- | -- | 1.79 | 2.15 |
| Earnings Per Share (Diluted) - Disc Ops | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Diluted) - Acc Change | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| NET EARNINGS PER SHARE (DILUTED) | 2.38 | 2.29 | 2.24 | 2.12 | 2.10 | 1.90 | 2.97 | 2.07 | 1.79 | 2.15 |
| Weighted Average Shares Outstanding (Basic) | 80.98 | 78.73 | 76.40 | 72.99 | 69.95 | 67.96 | 66.21 | 65.67 | 64.50 | 63.51 |
| Weighted Average Shares Outstanding (Diluted) | 81.05 | 78.82 | 76.50 | 73.09 | 70.09 | 68.10 | 66.33 | 65.95 | 64.81 | 63.92 |