Alliant EnergyKPI data tables
Alliant Energy operating metrics behind the KPI charts, newest period first (up to 24 periods per chart). Periods use each company's own fiscal labels where the source does; each table names its source.
| Item | Value |
|---|---|
| IPL retail electric: Marshalltown | 484 |
| IPL retail electric: Emery | 90 |
| IPL retail electric: Whispering Willow - East | 124 |
| IPL retail electric: Wind | 1,218 |
| IPL retail electric: Solar | 511 |
| IPL retail electric: Other | 4,852 |
| IPL retail gas | 630 |
| IPL wholesale electric (FERC) | 177 |
| WPL retail electric (2026 test period) | 6,234 |
| WPL retail gas (2026 test period) | 558 |
| WPL wholesale electric (FERC) | 550 |
Source: Alliant Energy Form 10-K for the year ended December 31, 2025, MD&A Rate Review Details table, Average Rate Base (in millions): https://www.sec.gov/Archives/edgar/data/352541/000035254126000007/lnt-20251231.htm.
| Period | IPL (Iowa) | WPL (Wisconsin) |
|---|---|---|
| FY 2025 | 16.171 | 16.958 |
| FY 2024 | 15.54 | 17.489 |
| FY 2023 | 16.172 | 16.415 |
Source: Alliant Energy Form 10-K for the year ended December 31, 2025, Electric Operating Information table (IPL and WPL), Sales (000s MWh), Total line. TWh is that figure divided by 1,000: https://www.sec.gov/Archives/edgar/data/352541/000035254126000007/lnt-20251231.htm.
| Period | Natural gas | Wind | Solar | Coal | Energy storage | Oil | Hydro |
|---|---|---|---|---|---|---|---|
| FY 2025 | 3,035 | 1,782 | 1,528 | 1,712 | 292 | 72 | 19 |
| FY 2024 | 2,960 | 1,782 | 1,514 | 1,710 | 18 | 70 | 19 |
Source: Alliant Energy Form 10-K Item 2 Properties, IPL and WPL facilities by primary fuel type, Total lines. Year ended December 31, 2025: https://www.sec.gov/Archives/edgar/data/352541/000035254126000007/lnt-20251231.htm. Year ended December 31, 2024: https://www.sec.gov/Archives/edgar/data/352541/000035254125000014/lnt-20241231.htm. Each year is IPL Total plus WPL Total for that fuel. Sheboygan Falls is in the AEF Non-utility Generation paragraph, not in these totals.
| Period | IPL (Iowa) | WPL (Wisconsin) |
|---|---|---|
| FY 2025 | 505,636 | 503,751 |
| FY 2024 | 503,279 | 499,688 |
| FY 2023 | 500,938 | 495,044 |
Source: Alliant Energy Form 10-K for the year ended December 31, 2025, Electric Operating Information table (IPL and WPL), Customers (End of Period), Retail line: https://www.sec.gov/Archives/edgar/data/352541/000035254126000007/lnt-20251231.htm. Consolidated June 30, 2026 count (not charted): Form 8-K Exhibit 99.1, July 30, 2026, KEY FINANCIAL AND OPERATING STATISTICS: https://www.sec.gov/Archives/edgar/data/352541/000035254126000042/lnt073020268-kex991.htm.
| Period | IPL (Iowa) | WPL (Wisconsin) |
|---|---|---|
| FY 2025 | 227,345 | 205,999 |
| FY 2024 | 226,838 | 203,861 |
| FY 2023 | 226,265 | 201,878 |
Source: Alliant Energy Form 10-K for the year ended December 31, 2025, Gas Operating Information table (IPL and WPL), Retail Customers (End of Period): https://www.sec.gov/Archives/edgar/data/352541/000035254126000007/lnt-20251231.htm. Consolidated June 30, 2026 count (not charted): Form 8-K Exhibit 99.1, July 30, 2026: https://www.sec.gov/Archives/edgar/data/352541/000035254126000042/lnt073020268-kex991.htm.
| Period | Gas | Coal | Wind (owned) | Purchased wind | Solar | Purchased other | Other |
|---|---|---|---|---|---|---|---|
| FY 2025 | 12.44 | 7.724 | 5.37 | 4.165 | 2.811 | 1.121 | 0.191 |
| FY 2024 | 13.883 | 6.204 | 5.54 | 4.285 | 1.833 | 1.715 | 0.201 |
| FY 2023 | 14.764 | 6.447 | 5.41 | 4.067 | 0.471 | 1.883 | 0.186 |
Source: Alliant Energy Form 10-K for the year ended December 31, 2025, Electric Operating Information - Alliant Energy, Sources of electric energy (000s MWh). TWh is that figure divided by 1,000. Wind under Purchased power is purchased wind. The standalone Wind line is owned wind: https://www.sec.gov/Archives/edgar/data/352541/000035254126000007/lnt-20251231.htm.