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Get StartedThings you can ask Sterling:
| Period | Authorized average rate base ($M) |
|---|---|
| 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 |