Solar in Marshalltown, IA
With Alliant Energy (Interstate Power & Light)'s electricity at about 18.4¢ per kWh and 1,359 kWh of sun per kW, solar is a close call for a typical Marshalltown home today: about a 15.9-year payback.
- Payback, typical home
- 15.9 yrsIowa: 22.7 yrs
- 25-year net
- $14,484after paying $22,675
- Sun
- 1,359kWh per kW per year
- Electricity
- 18.4¢3% above U.S. average
A typical Marshalltown home, by the numbers
| Utility | Alliant Energy (Interstate Power & Light) |
|---|---|
| Electricity use | 739 kWh a month |
| Best-value system | 5.9 kW, about 14 panels, 8,020 kWh a year (90% of use) |
| Cost | $22,675 |
| First-year savings | $1,479 |
| Payback | 15.9 years |
| Exported power | Full retail net metering (Alliant Energy (Interstate Power & Light)) |
Cash purchase, no federal credit, 1.6% yearly rate increases. Run it with your own numbers.
Homes in Marshalltown
- Owner-occupied homes
- 69%
- Single-family detached
- 73%
- Median home value
- $128k
- Median year built
- 1958
- Population
- 27,626
Census ACS 2020–2024.
Older housing stock. Many homes here were built before 1975. Have the roof and electrical panel checked before signing; a roof or panel upgrade can add thousands. Roof first?
Installers working in Marshalltown
Public installation records for Iowa don't name installers, so we can't rank local companies here. Browse installers in Iowa.
Always verify the license and get at least three quotes. Compare quotes side by side.
Questions about solar in Marshalltown
Is solar worth it in Marshalltown, IA?
For a typical home in Marshalltown, solar is a close call at 2026 prices: a 5.9 kW system costs about $22,675 after state incentives, saves about $1,479 in year one and pays back in about 15.9 years. Enter your address for an estimate based on your roof and bill.
How much solar power does a system produce in Marshalltown?
About 1,359 kWh per year for each kW of panels on a south-facing roof, based on PVWatts and local weather. That's 1% less than the Iowa average. East- or west-facing roofs produce roughly 10–20% less.
Who is the electric utility in Marshalltown?
Most homes in Marshalltown are served by Alliant Energy (Interstate Power & Light), at about 18.4¢ per kWh on average. Some areas are served by Consumers Energy Cooperative.
How much do solar panels cost in Marshalltown?
A fair cash price is around $3.75 per watt before incentives, so about $22,675 for a 5.9 kW system. There's no federal tax credit for homeowners who buy in 2026.
Nearby
- Ames no payback
- Cedar Falls no payback
- Ankeny no payback
- Waterloo no payback
- Des Moines no payback
- Urbandale no payback
- West Des Moines no payback
- Waukee no payback
- All of Iowa
Data: PVWatts (National Laboratory of the Rockies), EIA-861 2025 adjusted to 2026, U.S. Census ACS, LBNL Tracking the Sun, state policy research as of October 2026.