In short: The Corridor has two big utilities with very different prices. Cedar Rapids is Alliant Energy territory, where homes paid about 17.9¢ per kWh on average in 2024; Iowa City and Coralville get power from MidAmerican Energy at about 11.0¢ (EIA). The same solar panel is worth about 60% more in Cedar Rapids, while both counties rate “very high” for strong wind.
This page covers what is specific to Cedar Rapids and Iowa City: the two utilities’ solar billing and rates, Corridor Energy Cooperative, local storm risk, permits and charging. For statewide rules, including the July 1, 2027 date in Iowa’s solar law and the five-year solar property tax exclusion, see our Iowa energy guide.
Cedar Rapids–Iowa City at a glance
- Alliant Energy (Interstate Power and Light) serves the city of Cedar Rapids: about 17.9¢ per kWh for homes in 2024. Outages: 116 minutes per customer with major events, 99 without; about 1.1 interruptions a year (EIA-861; Alliant reports with a non-IEEE method, so compare with care).
- MidAmerican Energy serves Iowa City and Coralville (MidAmerican community list): about 11.0¢ per kWh in 2024; 219 outage minutes with major events, 88 without, across its Iowa system (EIA-861).
- Corridor Energy Cooperative (formerly Linn County REC) serves rural and suburban Linn and Johnson counties: about 14.2¢ per kWh, 116 outage minutes and 1.5 interruptions in 2024 (EIA-861).
- Sun: about 4.03 kWh per square meter per day, from 1.5 in December to 6.3 in July (NASA POWER, 2001 to 2020). Our rough estimate: about 1,175 kWh a year per kW of panels.
- Top hazards: Linn and Johnson counties both rate “relatively moderate” overall, with strong wind “very high.” Hail, tornado and winter weather are “relatively high” in both, plus ice storm and lightning in Linn and cold wave in Johnson (FEMA National Risk Index, December 2025).
- Public charging: 67 ports at 26 locations in Cedar Rapids and 82 ports at 38 locations in Iowa City (AFDC, October 3, 2026).
- Home solar: 10,120 Alliant homes in Iowa had net-metered solar in 2024, about 1 in 40 residential customers, against under 1 in 100 at MidAmerican. Corridor Energy had 638 (EIA-861).
Your utility and what it means
- Alliant (Cedar Rapids), solar billing: systems applied for after December 30, 2020 go on Alliant’s inflow/outflow rate. You pay the retail per-kWh rate, including riders, for power you take in each 15-minute interval, and get the same rate as a credit for power you send out. Credits carry forward to the end of your annual period (January or April); then any left are forfeited, not paid in cash. Output is credited at full rate on up to 110% of your annual use; above that, part of what you export is paid at the lower avoided-cost rate. Details are on Alliant’s Iowa customer generation page.
- Alliant, rate options: Night Owl (rate 427) has its lowest price from midnight to 8 a.m. year-round, which suits overnight EV charging. Summer Saver (rate 407) charges a premium only from 2 to 7 p.m. on weekdays in June, July and August. Smart Hours pays a $50 prepaid card for enrolling a smart thermostat and $25 a season. See Alliant’s Iowa rate options.
- Alliant Community Solar: the Cedar Rapids solar garden is fully subscribed; Alliant keeps a waitlist on its community solar page. It is an option if your roof won’t work.
- MidAmerican (Iowa City, Coralville): also inflow/outflow, measured every 15 minutes at the retail rate, with credits expiring at your annual reset. Its time-of-use rate makes 10 p.m. to 8 a.m. off-peak, with a summer weekday peak from 1 to 6 p.m. See MidAmerican’s interconnection and rates page and our Des Moines page for more on its programs.
- Corridor Energy Cooperative: follows the state’s interconnection rules; a Level 1 application (up to 20 kW) costs $125, and a system turned on before final approval gets locked out with a $100 fee. Its renewable generation page links its own Alternate Energy Production tariff and says it is not affiliated with any solar company.
Backup power in Cedar Rapids–Iowa City
Strong wind is the hazard that sets this area apart: FEMA rates it “very high” in both Linn and Johnson counties, the top level, alongside tornado, hail and winter weather risks. Alliant’s reported outage totals for 2024 were moderate, about two hours with major events, but storm seasons vary. In June 2026, Alliant restored more than 40,000 customers in Iowa and Wisconsin within 24 hours after severe weather and still had about 5,000 out.
So plan for the multi-day outage, not the average one. A portable power station handles phones, Wi-Fi and a CPAP. Basements with sump pumps, and homes that need heat in a January storm, are the case for a natural gas standby generator or a large home battery. Compare them in backup power options and size them with the battery backup calculator or the generator sizing tool.
Safety first: the CPSC says to run portable generators outdoors only, at least 20 feet from the house, never in a garage, with battery-backed CO alarms inside. Alliant notes grid-tied solar won’t power your home in an outage unless a transfer switch meeting its rules is installed. Use a licensed electrician (generator installation).
Solar in Cedar Rapids–Iowa City
The sun is the same across the Corridor, about 1,175 kWh a year per kW by our rough estimate. The price is not. At Alliant’s 2024 average of 17.9¢, each kW is worth about $210 a year in Cedar Rapids; at MidAmerican’s 11.0¢ in Iowa City, about $130. These are estimates from average prices, not quotes. Perhaps because of that gap, home solar is more than three times as common among Alliant customers.
Size matters with Alliant: credits beyond 110% of your annual use are paid at the lower avoided-cost rate, and banked credits are forfeited each year. Ask the installer to show the 110% math. Run your roof through the solar potential tool and the solar savings calculator, and read solar installation and how net metering works.
Batteries in Cedar Rapids–Iowa City
With exports credited at the retail rate, a battery adds little to solar savings with either utility; none of their Iowa solar customers reported a battery in EIA’s 2024 data. Its value here is backup in wind and ice storms, and possibly shifting use away from Alliant’s summer afternoon peak if you choose a time-of-day rate. We found no utility battery rebate. See home battery installation and home battery cost.
EV charging in Cedar Rapids–Iowa City
At about 30 kWh per 100 miles, home charging costs roughly $5.40 per 100 miles at Alliant’s 2024 average and $3.30 at MidAmerican’s (our estimates), less on an overnight rate. Alliant’s online Marketplace sells Level 2 home chargers. Iowa City has 82 public ports and Cedar Rapids 67 (AFDC, October 3, 2026). A Level 2 charger needs a 240-volt circuit and an electrical permit. See EV charger installation and the EV charging cost calculator.
Drive on another fuel? See every alternative fuel station in Cedar Rapids: hydrogen, propane, natural gas, E85 ethanol, biodiesel and renewable diesel.
Permits and inspections
- Cedar Rapids: Building Services (500 15th Ave SW, 319-286-5939) has separate rooftop and ground-array solar permit applications. The rooftop form (revised December 2024) names the electrical contractor and goes to elec-permits@cedar-rapids.org. Its fee is set by project value: $25 plus 1% of the amount over $1,000, up to $100,000, so about $265 for a $25,000 system. Starting work before the permit doubles the fee, with a $250 minimum.
- Iowa City: the city publishes a Solar in Iowa City page and handles permits through its permits office. Check there before your installer files.
- Elsewhere: other cities and unincorporated county areas have their own permit offices; check with yours. Alliant asks for proof of a passed electrical inspection before it installs the solar meter.
- Who does the wiring: Iowa licenses electricians and electrical contractors statewide (lookup on the state page). If you have an HOA, get its approval in writing.
Cities we cover
- Cedar Rapids
- Iowa City
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Cedar Rapids–Iowa City energy FAQ
Is Cedar Rapids Alliant or MidAmerican?
For electricity, the city of Cedar Rapids is Alliant Energy (Interstate Power and Light). MidAmerican supplies natural gas there. Iowa City and Coralville get both electricity and gas from MidAmerican. Rural Linn and Johnson county homes may be on Corridor Energy Cooperative.
Why does solar pay better in Cedar Rapids than in Iowa City?
Because Alliant’s power cost about 17.9¢ per kWh on average in 2024 against MidAmerican’s 11.0¢. Both credit exports at their retail rate, so each kWh your panels make is worth more in Cedar Rapids. By our estimate that is about $210 versus $130 a year per kW.
What happens to extra solar credits with Alliant?
They carry forward month to month until the end of your annual period, January or April, and are then forfeited, not paid out. Output above 110% of your annual use is credited at the lower avoided-cost rate, so a system sized to your use makes the most sense.
How much is a solar permit in Cedar Rapids?
It depends on the project value. The city’s rooftop solar form charges $25 plus 1% of the value over $1,000, up to $100,000. A $25,000 project would pay about $265. Your electrical contractor normally files it.
Sources
Utilities, prices, outages and solar counts: U.S. Energy Information Administration, EIA-861 data for 2024. Alliant Energy Iowa customer generation, inflow/outflow FAQ, rate options, energy tech offers, community solar and June 2026 news pages; Alliant franchise fee tariff (Cedar Rapids). MidAmerican Energy community list, interconnection and time-of-use pages. Corridor Energy Cooperative renewable generation page. City of Cedar Rapids rooftop solar permit application (2025). Sun: NASA POWER, 2001 to 2020. Hazards: FEMA National Risk Index, December 2025. Charging: Alternative Fuels Data Center. Generator safety: CPSC. All checked October 3, 2026.