ALLIANT ENERGY CORP
For the period ended Dec 31, 2025. Filed Feb 20, 2026.
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FY2025 · Filed Feb 20, 2026
LNT$72.67-1.0%Stored close · as of Nov 6, 2026
Extracted filing text, with the paragraph anchors used by the comparison.
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Gas Operating Information
| Gas Operating Information - Alliant Energy | 2025 | 2024 | 2023 |
|---|---|---|---|
| Revenues (in millions): | |||
| Residential | $306 | $275 | $316 |
| Commercial | 153 | 133 | 163 |
| Industrial | 13 | 11 | 16 |
| Retail subtotal | 472 | 419 | 495 |
| Transportation/other | 53 | 46 | 45 |
| Total | $525 | $465 | $540 |
| Sales (000s Dths): | |||
| Residential | 27,945 | 24,243 | 25,838 |
| Commercial | 19,264 | 16,974 | 18,291 |
| Industrial | 2,154 | 2,272 | 2,276 |
| Retail subtotal | 49,363 | 43,489 | 46,405 |
| Transportation/other | 123,141 | 123,386 | 115,177 |
| Total | 172,504 | 166,875 | 161,582 |
| Retail Customers (End of Period) | 433,344 | 430,699 | 428,143 |
| Other Selected Gas Data: | |||
| Heating degree days (a): | |||
| Cedar Rapids, Iowa (IPL) (normal - 6,684) | 6,215 | 5,450 | 5,807 |
| Madison, Wisconsin (WPL) (normal - 6,929) | 6,841 | 5,801 | 6,157 |
| Revenue per Dth sold to retail customers | $9.56 | $9.63 | $10.67 |
| Purchased gas costs per Dth sold to retail customers | $5.24 | $5.06 | $6.37 |
| Gas Operating Information | IPL | WPL | ||||
|---|---|---|---|---|---|---|
| 2025 | 2024 | 2023 | 2025 | 2024 | 2023 | |
| Revenues (in millions): | ||||||
| Residential | $155 | $148 | $176 | $151 | $127 | $140 |
| Commercial | 72 | 68 | 86 | 81 | 65 | 77 |
| Industrial | 7 | 7 | 11 | 6 | 4 | 5 |
| Retail subtotal | 234 | 223 | 273 | 238 | 196 | 222 |
| Transportation/other | 31 | 27 | 27 | 22 | 19 | 18 |
| Total | $265 | $250 | $300 | $260 | $215 | $240 |
| Sales (000s Dths): | ||||||
| Residential | 14,026 | 12,413 | 13,146 | 13,919 | 11,830 | 12,692 |
| Commercial | 8,427 | 7,714 | 8,477 | 10,837 | 9,260 | 9,814 |
| Industrial | 1,257 | 1,513 | 1,505 | 897 | 759 | 771 |
| Retail subtotal | 23,710 | 21,640 | 23,128 | 25,653 | 21,849 | 23,277 |
| Transportation/other | 44,489 | 43,075 | 43,232 | 78,652 | 80,311 | 71,945 |
| Total | 68,199 | 64,715 | 66,360 | 104,305 | 102,160 | 95,222 |
| Retail Customers (End of Period) | 227,345 | 226,838 | 226,265 | 205,999 | 203,861 | 201,878 |
| Other Selected Gas Data: | ||||||
| Maximum daily winter peak demand (Dth) | 266,886 | 267,820 | 290,922 | 250,286 | 221,135 | 234,796 |
| Heating degree days (a): | ||||||
| Cedar Rapids, Iowa (IPL) (normal - 6,684) | 6,215 | 5,450 | 5,807 | N/A | N/A | N/A |
| Madison, Wisconsin (WPL) (normal - 6,929) | N/A | N/A | N/A | 6,841 | 5,801 | 6,157 |
| Revenue per Dth sold to retail customers | $9.87 | $10.30 | $11.80 | $9.28 | $8.97 | $9.54 |
| Purchased gas cost per Dth sold to retail customers | $5.51 | $5.68 | $7.16 | $4.98 | $4.44 | $5.59 |
(a)Heating degree days are calculated using a simple average of the high and low temperatures each day compared to a 65 degree base. Normal degree days are calculated using a rolling 20-year average of historical heating degree days.
- OTHER UTILITY OPERATIONS - STEAM -IPL’s Prairie Creek facility provided steam for IPL’s two high-pressure steam customers in Iowa. These customers were each under contract through 2025 for taking minimum quantities of annual steam usage, with certain conditions. Subsequent to December 31, 2025, IPL exited the steam business.
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