Solar in Missouri costs about $2.74 per watt, so the typical 7.69 kW system runs about $21,071 before incentives. The bigger question is size: power netted within the month earns full retail, but a monthly surplus is marked down and banked credit expires after 12 months, so match the system to your monthly use, not your roof.
Size a Missouri system to your months, not your roof
Oversizing in Missouri turns full-retail power into credit that expires. Enter your ZIP code and we will size a system against your monthly usage.
EcoGen is a referral service. Your request may be shared with installers, marketplaces or lead exchanges, and more than one provider may contact you. Review the contact consent before submitting.
- Free, no-obligation quotesRequest quotes from local installers in minutes. You decide if you go ahead.
- Compare provider credentialsAsk for licensing, insurance and warranty details before signing.
- Your details come lastFour quick questions about your home first. Name, email and phone only at the end.
Full retail, then a markdown, then zero: the life of a Missouri solar credit
Missouri’s Net Metering and Easy Connection Act gives you full retail one-to-one netting, for systems up to 100 kW. Then it attaches a clock. Nobody sends a warning, and nothing on the bill says a credit is about to lapse.
What one kilowatt-hour from your panels is worth, stage by stage
The 13.95¢ is the statewide average, used here as the retail rate. Your own supplier’s rate is what applies.
Overbuilding for spring does not pay hereThe classic plan is to overbuild in spring and coast through winter. In Missouri, a system sized 20% larger than your usage does not bank 20% more value. It banks a markdown with an expiry date on it.
Evergy follows the same clockEvergy Missouri Metro and Missouri West apply the same twelve-month expiry. Their net excess terms are set in PSC case EE-2019-0056.
Read a Missouri proposal month by month, starting with April
A quote that offsets 100% of your yearly use sounds ideal. But a year is the wrong unit in a state that nets monthly and expires yearly. Ask for a month-by-month production and use table, and look hard at April, May and June: output peaks, and air conditioning has not started.
- Aim for high self-use, not high offset. The two are not the same, and only self-use is worth full retail.
- Move what you can into daylight. Water heating, laundry, EV charging and pool pumps move real money at a 13.95¢ spread against surplus credit.
- Treat a battery as an expiry hedge, not just backup. Storing an evening’s worth keeps kilowatt-hours at retail value instead of sending them into a markdown.
- Ask your utility for its avoided fuel cost. Ameren’s summer figure is quoted in the market near 5.39¢. We could not confirm it against the tariff sheet, and we will not guess at the winter figure.
What $2.74 a watt buys on a Missouri roof, 5 kW to 12 kW
At $2.74 per watt, Missouri ranks 12th lowest of 51. The typical system is 7.69 kW, the median size Missouri homeowners installed in 2025 (Berkeley Lab, 381 systems), at about $21,071 before incentives, and makes roughly 10,751 kWh a year. The expiry rule makes the middle sizes the safe ones for most homes. To see how Missouri compares with every other state, read our national solar cost guide.
Gross cost at the $2.74 per watt benchmark, before incentives. Real quotes vary by roof, equipment and installer.
Cheap Missouri power stretches payback to 14.1 years
Cheap power is good for your bill and awkward for solar. Every kilowatt-hour you displace is worth less here than almost anywhere else. Used as it is made, the typical 7.69 kW system’s 10,751 kWh a year are worth about $1,500. Best-case payback: about 14.1 years, if every kWh the 7.69 kW system makes replaces power at the 13.95¢ state average. Power you export usually earns less, so most homes take longer.
Rising rates shorten the payback slowly. The federal residential credit is $0 for systems you own whose installation is completed after December 31, 2025, under Public Law 119-21. There is no statewide rebate, so no subsidy will rescue a weak quote. One local exception: Columbia Water & Light pays $500 per kW and offers solar loans up to $15,000.
13.95¢ is not your rateThe yearly value and payback both run on the statewide average, which is ranking context, not a billed rate. Ameren Missouri, Evergy Metro and Evergy Missouri West each file their own residential rates. Rerun the numbers with the rate on your own bill.
Hold off in Missouri if one of these describes your quote or your home
- You are being sold maximum roof coverage. With monthly netting and yearly expiry, oversizing turns retail kilowatt-hours into expiring ones. Get the monthly table before you sign.
- Nobody is home by day, with no load to shift and no battery. Full retail only applies to what you net within the month.
- Your quote is well above $2.74 per watt. With 13.95¢ power and no federal credit, the install price does most of the work in this math.
- You may not stay long. Even a strong self-use profile is looking at about 14.1 years here.
See the month-by-month table before you sign
Your monthly shape decides Missouri payback, not your annual total. Enter your ZIP code to meet installers who will show you the table.
- Quotes built for your roofEach quote is designed around your home and your bills.
- Check the providerVerify licensing, insurance and warranty terms before signing.
- No cost, no pressureComparing quotes is free, and you are never obliged to sign.
More Missouri solar reading
Frequently asked questions
How much do solar panels cost in Missouri in 2026?
About $2.74 per watt installed, 12th lowest of 51 in the EcoGen Solar Cost Index (September 2026 Edition). The typical Missouri system is 7.69 kW, the median size Missouri homeowners installed in 2025, roughly $21,071 before incentives, producing around 10,751 kWh a year.
Does Missouri have net metering?
Yes, full retail one-to-one within each monthly billing period, for systems up to 100 kW, under the Net Metering and Easy Connection Act. The catch is what happens to a surplus: monthly excess is credited at the utility avoided fuel cost rather than retail, and any credit expires uncompensated twelve months after it is issued.
Do Missouri solar credits expire?
Yes. Credits expire uncompensated twelve months after issuance, so a spring surplus can disappear before winter demand arrives to use it. This is why sizing to your monthly consumption matters more in Missouri than maximising annual offset, and why a battery here functions partly as protection against expiry.
What is the solar payback period in Missouri?
About 14.1 years in the best case, if every kWh the 7.69 kW system makes replaces power at the 13.95¢ state average. Missouri electricity is cheap, so each displaced kilowatt-hour is worth less than in most states. Rates have risen 2.99% a year over five years, which shortens the figure gradually.
Is there still a federal tax credit for solar in Missouri?
Not for systems you buy yourself. Section 25D is $0 for owner-purchased systems whose installation is completed after December 31, 2025 under Public Law 119-21. The commercial credit can still reach residential rooftops through third-party ownership where that is available, so ask any installer to state plainly which credit, if any, their pricing assumes.
How we calculate these costs
Cost figures use Missouri’s entry in the EcoGen Solar Cost Index (September 2026 Edition): $2.74 per watt as of September 25, 2026. The 7.69 kW typical size is Berkeley Lab’s 2025 median for Missouri single-family installs (381 systems). Payback is a simple best case with no federal residential credit for owner-purchased systems: the typical cost divided by the year-one value of every kWh at the 13.95¢ state average (EIA 12-month residential average, August 2025 to July 2026). The Ameren summer avoided-cost figure quoted in the market is indicative only and unconfirmed against the tariff sheet.
Sources (6)
- Missouri Legislature, RSMo 386.890: Net Metering and Easy Connection Act (rules at 20 CSR 4240-20.065). Accessed June 11, 2026: revisor.mo.gov
- Missouri Public Service Commission, Case EE-2019-0056: Evergy Net Metering Terms. Accessed June 11, 2026: psc.mo.gov
- U.S. Energy Information Administration, Electric Power Monthly, 12-month residential average price, August 2025 to July 2026: eia.gov
- U.S. Energy Information Administration, Form EIA-861, 2024. Accessed June 10, 2026: eia.gov
- U.S. Census Bureau, American Community Survey, 2024. Accessed June 11, 2026: census.gov
- IRS, One, Big, Beautiful Bill Provisions (Public Law 119-21). Accessed August 15, 2026: irs.gov
