| Fiscal period | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|
| Period End Date | 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 | 12/31/2015 |
|---|
| Operating Revenues | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Revenues : Gas | 313.20 | 353.31 | 371.27 | 320.13 | 257.86 | 276.73 | 270.92 | 268.60 | 245.65 | 269.87 |
| Revenues : Electric | 1,200.70 | 1,068.83 | 1,106.57 | 1,052.18 | 940.82 | 981.18 | 921.09 | 1,037.05 | 1,011.60 | 944.43 |
| Revenues- Other | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Total revenues | 1,513.90 | 1,422.14 | 1,477.84 | 1,372.32 | 1,198.67 | 1,257.91 | 1,192.01 | 1,305.65 | 1,257.25 | 1,214.30 |
| Cost of sales | 433.82 | 420.26 | 492.01 | 425.55 | 306.19 | 318.02 | 272.88 | 410.35 | 400.97 | 372.86 |
| Gross profit | 1,080.08 | 1,001.88 | -- | 946.77 | 892.48 | 939.89 | 919.13 | 895.30 | -- | 841.44 |
| Operating and maintenance | 227.84 | 220.52 | 221.43 | 208.30 | -- | -- | -- | -- | -- | -- |
| Depreciation | 227.64 | 210.47 | 195.02 | 187.47 | 179.64 | 172.92 | 174.48 | 166.14 | 159.34 | 144.70 |
| Goodwill and other intangibles amortization | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Amortization of intangibles | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Operating, general and administrative | 137.44 | 117.36 | 113.78 | 101.87 | 297.12 | 318.23 | 307.12 | 305.14 | 302.89 | 297.48 |
| Property and other taxes | 163.85 | 153.07 | 192.52 | 173.44 | 179.52 | 171.89 | 171.26 | 162.61 | 148.10 | 133.44 |
| Restructuring charge | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Reorganization professional fees and expenses | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Reorganization items | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Reorganization Interest Income | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Ammondson verdict | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Mountain States Transmission Intertie impairment | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Impairment on assets held for sale | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Total Operating Expenses | 1,190.58 | 1,121.69 | 1,214.76 | 1,096.64 | 962.47 | 981.06 | 925.74 | 1,044.24 | 1,011.30 | 948.48 |
| Operating income (loss) | 323.32 | 300.46 | 263.08 | 275.68 | 236.20 | 276.85 | 266.27 | 261.42 | 245.95 | 265.82 |
| Interest expense | 131.67 | 114.62 | 100.11 | 93.67 | 96.81 | 95.07 | 91.99 | 92.26 | 94.97 | 92.15 |
| Investment and other income | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other Income | 23.02 | 15.83 | 19.43 | 8.25 | 4.85 | 0.41 | 3.97 | 6.92 | 5.55 | 7.58 |
| Loss on debt extinguishment | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Pre-Tax Income | 214.67 | 201.67 | 182.40 | 190.26 | 144.25 | 182.20 | 178.25 | 176.07 | 156.53 | 181.25 |
| Income tax (expense) benefit | (9.44) | 7.54 | (0.61) | 3.42 | (10.97) | (19.93) | (18.71) | 13.37 | (7.65) | 30.04 |
| Federal:Deferred | (3.81) | 2.93 | -- | 2.63 | (4.01) | (15.17) | (15.59) | 17.38 | (2.05) | 33.03 |
| State : Current | (0.04) | (1.97) | -- | 2.17 | 0.00 | 0.03 | 0.04 | 0.03 | 0.01 | (0.09) |
| State : Deferred | 0.56 | 3.79 | -- | (1.97) | (3.57) | 1.31 | 2.40 | (5.02) | (6.13) | 0.86 |
| Federal: Investment tax credits | -- | (0.13) | -- | (0.13) | 0.00 | (0.01) | (0.03) | 0.17 | (0.20) | (0.23) |
| Federal:: Current | (8.12) | 2.93 | -- | 0.72 | (3.40) | (6.08) | (5.53) | 0.81 | 0.72 | (3.53) |
| Federal: State | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Minority Interests in Net Loss of Consolidated Subsidiaries | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Income from continuing operations | -- | -- | 183.01 | -- | -- | -- | -- | -- | -- | -- |
| Discontinued Operations, Net of Taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Extraordinary item, net of tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Consolidated Net Income (Loss) | 224.11 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Minority Interests on Preferred Securities of Subsidiary Trusts | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Dividends and Redemption Premium on Preferred Stock | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (Loss) available to limited partners shareholders | 224.11 | 194.13 | 183.01 | 186.84 | 155.22 | 202.12 | 196.96 | 162.70 | 164.17 | 151.21 |
| Earnings Per Share (Basic) - Cont Ops | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Basic) - Disc Ops | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Basic) - Extras | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| NET EARNINGS PER SHARE (BASIC) | 3.66 | 3.22 | 3.28 | 3.61 | 3.07 | 4.01 | 3.94 | 3.35 | 3.40 | 3.20 |
| Earnings Per Share (Diluted) - Cont Ops | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Diluted) - Disc Ops | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Earnings Per Share (Diluted) - Extras | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| NET EARNINGS PER SHARE (DILUTED) | 3.65 | 3.22 | 3.25 | 3.60 | 3.06 | 3.98 | 3.92 | 3.34 | 3.39 | 3.17 |
| Weighted Average Shares Outstanding (Basic) | 61.29 | 60.32 | 55.77 | 51.71 | 50.56 | 50.43 | 49.99 | 48.56 | 48.30 | 47.30 |
| Weighted Average Shares Outstanding (Diluted) | 61.37 | 60.32 | 55.77 | 51.87 | 50.70 | 50.75 | 50.24 | 48.66 | 48.48 | 47.30 |