ForgeAsset / Utilities / Alliant Energy (Interstate Power and Light)

Alliant Energy (Interstate Power and Light) LGS — EV fast-charging electricity cost

Alliant IPL LGS is the filed rate schedule ForgeAsset models for DC fast-charging sites in Alliant Energy territory in Iowa. Energy prices at 4.7¢/kWh–5.8¢/kWh by time of day; the demand side bills $32.08/kW of monthly peak. For one reference Supercharger site held constant across the whole library, that works out to 72.9¢/kWh per dispensed kWh — rank 76 of 86 filed tariffs (1 = least expensive).

Modeled rates

Alliant's large-service rate for the Cedar Rapids area: low time-of-use energy against the heaviest demand charge in the Iowa pair, billed on the peak inside a 7 a.m.–8 p.m. weekday window — which coincides with a charging site's monthly peak. Figures fold the fuel, efficiency, demand-response, and transmission riders plus Cedar Rapids' combined 10.24% tax stack. Iowa's 2.6¢/kWh electric-fuel excise is carried separately in the state tax profile. The fuel component resets monthly and is re-derived at every library refresh.

The filed rate book for this territory records no EV-specific commercial rate, so the modeled cost is the standard schedule. Demand follows the model's conservative convention — 150 kW per stall billed every month, the worst-case coincident peak — so a site whose metered peak runs below that would see a lower demand line.

Source: Alliant Energy (Interstate Power and Light) filed rate schedule. Rates are digit-verified against the utility's own filed sheets and update within two weeks of any revision; derivations are on the methodology page.

What the reference site pays here

Reference site: 8 Tesla V4 stalls at 235 kWh/stall/day (57,183 kWh dispensed per month), a 150kW per-stall demand assumption, the model's default time-of-use mix, and a 12% loss gross-up — identical to the full utility ranking, where this tariff sits at position 76 of 86.

The rest of the Iowa picture

The tariff is one layer. State taxes, incentives, clean-fuels programs, and the charging market shape the remainder — Tesla Supercharger ROI in Iowa covers them, and the US Supercharger Economics Map shows every US Supercharger over utility territories colored by this same effective-cost derivation.

Alliant Energy (Interstate Power and Light) LGS — questions

What does Alliant Energy (Interstate Power and Light) charge for energy on LGS?

The modeled rates are 4.7¢/kWh–5.8¢/kWh by time of day. At the model's default time-of-use mix (30% peak, 45% off-peak, 25% super-off-peak) that blends to 5.0¢/kWh.

Does LGS carry a demand charge?

Yes: $32.08/kW of monthly peak. For a reference 8-stall site at 150 kW per stall that comes to about $38,492 per month.

What does electricity cost per kWh dispensed on this tariff?

For the reference site — 8 Tesla V4 stalls dispensing 235 kWh per stall per day, with a 12% loss gross-up — the all-in utility cost works out to 72.9¢/kWh per dispensed kWh, rank 76 of 86 tariffs in the library (1 = least expensive).

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates current as of research; verify current terms with the utility's filed schedule before committing capital.