Missouri treats solar well inside each billing month and poorly after it. At Ameren Missouri, the largest utility, a typical owned system has a simple payback before incentives of about 15.7 years; across the large private utilities it runs 14.5 to 18.0 years. Those figures assume a small share of output is left over at month end. Surplus earns a few cents per kWh, so a system that piles it up takes longer. System size decides which.
Simple payback before incentives, Ameren MissouriAbout 15.7 years
Large private utilities14.5 to 18.0 years
Typical owned 7.69 kW Missouri system at $21,071 cash (EcoGen Solar Cost Index, September 2026), no incentives. Ameren Missouri: its EIA 12-month price of 14.11¢ less its $9.00 monthly customer charge, 13.22¢, for power used at home or netted in the month, and 7.3% of output left over at month end at 3.58¢. No upkeep and no price rises are counted. See the math.
- Monthly use: size the system to your months, not to your roof.
- Utility: Ameren Missouri, Evergy, Liberty or a city utility. Each pays its own surplus rate.
- Time in home: credits expire when you end service, and payback runs about 15 to 18 years.
2026 rules: home systems finished after December 31, 2025 get no federal homeowner credit (IRS). Ameren Missouri reissued its surplus rate sheet on June 1, 2026 with the same rates; the large private utilities restate them again in 2027.
How we checked this guide
Credit rules come from Missouri’s net metering law and the utility rate sheets filed with the Public Service Commission, and the electricity price from the U.S. Energy Information Administration. The example is the EcoGen Solar Cost Index typical Missouri home. Where we assume a number, the page says so.
The writer and checker shown above are EcoGen staff. EcoGen is paid when homeowners request quotes, which is explained beside the quote form. Read our editorial standards.
Where a Missouri kilowatt-hour ends up
A kWh (kilowatt-hour) is the unit of power your bill counts. Under Missouri’s net metering law, every electric utility must offer net metering for systems up to 100 kW. Inside one billing month, each kWh you send to the grid cancels a kWh you buy. After the month ends, the value falls away.
| What happens to the kWh | What it is worth |
|---|---|
| Your home uses it as it is made | Your full price per kWh. Missouri homes paid an average of 13.97¢ (EIA, September 2025 to August 2026). |
| It goes to the grid, and your home buys at least as much that month | Also your full price. Netting cancels it against power you buy. |
| It is still left over when the month closes | Your utility’s surplus rate: 1.90 cents to 3.84 cents per kWh at the four large private utilities. |
| The credit is still unused 12 months later | Nothing. It expires with no payment. |
Read the rows as a ladder you want to stay at the top of. Monthly netting does most of the work. The trouble starts when a system makes more than the home uses across whole months, which is what an oversized array does every Missouri summer. Each credit then carries its own clock: a credit earned in June expires the next June. Credits also end at once if you close your account, which matters if you might sell.
Signs Missouri solar fits your home, and signs to wait
Missouri rewards restraint more than ambition. Read each row across.
System size
Worth a closer look
Month by month, the system makes less than or about what your home uses.
Pause and check
The quote fills the roof, and summer output runs well past summer use.
Check next: a table of monthly output next to 12 months of your bills.
Utility
Worth a closer look
You know your utility and its surplus rate: 1.90 cents to 3.84 cents per kWh at the four large private ones.
Pause and check
The quote uses a generic rate, or says exports earn the full price all year.
Check next: your utility’s name on the quote and the tariff sheet it relied on.
Price
Worth a closer look
A cash price near the Index’s $21,071 for 7.69 kW ($2.74 per watt), already free of sales tax on the equipment.
Pause and check
A loan with a dealer fee, or a sales tax line on a price that should not carry one.
Check next: the cash price next to the financed price, with APR, fees and any tax line.
Roof and time in home
Worth a closer look
An unshaded roof with years of life left, and a plan to stay past payback.
Pause and check
A roof due for work, heavy shade, or a likely move within about 15 years.
Check next: the roof’s age, a shade report and your likely moving date.
Ready to get real quotes for your Missouri home?
Quotes are free. Hold each one against the payback math below.
Solar providers that serve your area may contact you, and they pay EcoGen for the introduction. How we make money.
Payback with exports netted, and with exports left over
Simple payback is the years your savings take to cover what you paid: net cost divided by yearly savings. Here is the typical Missouri system, owned, at Ameren Missouri, from our per-utility payback figures of October 30, 2026.
- Cash price
- $21,071
- Confirmed incentives
- $0
- Year-one production
- 10,758 kWh
- Used or netted in the month / left over at month end
- 92.7% / 7.3%
- Price for power used or netted (Ameren, EIA, 12 months, less $9.00 customer charge)
- $0.1322/kWh
- Month-end surplus credit (3.84¢ summer, 3.39¢ other months, weighted)
- $0.0358/kWh
- Upkeep counted
- $0/yr
- Used or netted value
10,758 × 92.7% × $0.1322$1,318/yr - Surplus value
10,758 × 7.3% × $0.0358$28/yr - Yearly savings
$1,318 + $28$1,346/yr - Simple payback before incentives
$21,071 ÷ $1,346about 15.7 years
Inputs: the EcoGen Solar Cost Index typical Missouri system (7.69 kW, $21,071 cash, September 2026; 1,399 kWh per kW a year, so about 10,758 kWh in year one). No rebate is counted. Power sent out and netted against power bought in the same month is worth the full price. The 7.3% left over at month end is the share reported in federal data for Ameren’s solar homes, not measured at your meter. These figures count no upkeep and no price rises; with every surplus kWh at 3.39¢ the payback is still 15.7 years.
Now keep the panels, the price and the power the same, and change only the utility. Each one has its own price and surplus rate, and each figure takes out the utility’s fixed monthly charge where it has one.
| Utility | Price used or netted | Left over at month end | Yearly savings | Simple payback |
|---|---|---|---|---|
| Ameren Missouri | $0.1322/kWh | 7.3% at $0.0358 | $1,346 | about 15.7 years |
| Liberty | $0.1350/kWh | 0.3% at $0.0330 | $1,449 | about 14.5 years |
| Evergy Missouri Metro | $0.1222/kWh | 1.9% at $0.0190 | $1,294 | about 16.3 years |
| Evergy Missouri West | $0.1108/kWh | 2.1% at $0.0198 | $1,172 | about 18.0 years |
The left-over shares are reported in federal data, not measured at your meter. A system sized to the home nets most of its power, while one built to fill a roof spills surplus every summer and pays back more slowly. City Utilities of Springfield and Independence Power and Light print no surplus rate we could use, and we did not model Columbia’s city utility, so ask yours.
Test your own Missouri quote
The tool starts with the Ameren Missouri case above. Enter your quote’s numbers and press Calculate; lower the share used at home to see an oversized system that leaves more surplus. Nothing you enter is sent anywhere.
Example result
about 15.7 years
simple payback before incentives
- Used-at-home value
- $1,318/yr
- Export value
- $28/yr
- Owner costs
- $0/yr
- Yearly savings
- $1,346/yr
- Net cost
- $21,071
Starts with the Ameren Missouri case above. Lower the share used at home to see more surplus left over at month end. Flat first-year values; rates, panel wear and repairs will change the result.
What each Missouri utility pays for leftover power
Your export credit is what a kWh sent to the grid earns. In Missouri it is the full price while the month lasts, then your utility’s surplus rate.
Used at home or netted in the month: 9,974 kWh. Each one replaces power you would have bought, so it saves the full price ($0.1322 here).
Left over at month end: 784 kWh. These earn Ameren’s surplus rate ($0.0358 here, weighted by season), far below the price you pay.
Once the month closes, the name on your bill decides the rate. Rates below are from sheets filed with the Public Service Commission.
| Utility | Surplus rate per kWh |
|---|---|
| Ameren Missouri | 3.84 cents June to September, 3.39 cents October to May |
| Evergy Missouri Metro | 1.90 cents |
| Evergy Missouri West | 1.98 cents |
| Liberty (Empire District) | 3.31 cents June to September, 3.30 cents October to May |
| City Utilities of Springfield | Its avoided cost, reset every six months (Sheet 21, dated October 2026) |
Co-ops and other city utilities set their own surplus rate; get it in writing. City of Columbia Utilities also pays a rebate of $500 per kW, or about $3,845 at the base rate on the typical system; confirm it with the city.
Find out which surplus rate applies to you
Each Missouri utility pays its own rate for leftover power. Ask every installer which one their numbers use.
Solar providers that serve your area may contact you, and they pay EcoGen for the introduction. How we make money.
Six things to see on a Missouri quote
Ask any installer to show monthly production against monthly use before you sign. If a quote cannot show these, its payback cannot be checked.
- Monthly output against monthly use. Twelve rows, one per month, from your own bills.
- Surplus rate by name. The utility, its surplus rate per kWh, and the season it applies to.
- Credit expiry. A plain statement that unused credits expire after 12 months or when you end service.
- Size and paperwork. kW, year-one kWh, and the utility review time: 30 days up to 10 kW, 90 days above.
- No sales tax on equipment. Your installer buys the equipment tax-free under 12 CSR 10-112.020.
- Cash and financed prices. Both totals side by side, with any dealer fee shown.
Compare Missouri solar quotes
Ask each installer for monthly output next to your monthly use, and the surplus rate they assumed. Enter your ZIP code to request quotes from solar providers that serve your area.
How EcoGen is paid
EcoGen America does not sell or install solar. When you request quotes, we pass your request to solar providers serving your area, and they pay us for the introduction. Providers can include installers, solar marketplaces and lead exchanges, and more than one may contact you. You never pay us.
More Missouri solar guides
- Missouri solar guide: utilities, incentives and installers in one place
- Missouri solar companies: compare local installers before you request quotes
- Missouri solar incentives: monthly bill credits and tax rules
- What solar costs in Missouri
- Free solar panels in Missouri: what a zero-down offer means
- Are solar panels worth it? The national guide and payback calculator
All 51 state guides
Missouri solar questions
Are solar panels worth it in Missouri?
They can be for a home that stays put and sizes the system to its monthly use. A typical owned system has a simple payback before incentives of about 15.7 years at Ameren Missouri and 14.5 to 18.0 years across the large private utilities. A system that piles up monthly surplus takes longer. Missouri power is fairly cheap, so a long payback is normal here.
Do Missouri solar credits expire?
Yes. Power left over at the end of a month becomes a credit on a later bill, and each credit expires with no payment 12 months after it was issued, or sooner if you end service or leave net metering. Each credit has its own clock, so a June credit runs out the next June.
How big should my Missouri solar system be?
Size it to your monthly use, not your yearly total or your roof. Netting resets every billing month, so power past what the home uses that month earns only the surplus rate, and unused credits expire. Ask for a month-by-month table. If output beats use in most months, the system is too big.
What does Missouri pay for excess solar power?
Inside the month, a kWh you export cancels a kWh you buy. A monthly surplus earns much less: 1.90 cents per kWh at Evergy Missouri Metro, 1.98 cents at Evergy Missouri West, 3.30 cents to 3.31 cents at Liberty, and 3.39 cents to 3.84 cents at Ameren Missouri, by season.
Is Missouri net metering going away?
No end date is set. State law requires net metering at every electric utility for systems up to 100 kW. Two limits apply: a utility may stop offering it once net-metered capacity reaches 5% of its peak load, and it may stop approving new systems for the year once that year’s approvals reach 1% of its peak load. Surplus rates are restated in odd years, next in 2027.
Is there a Missouri solar tax credit?
No. Missouri’s 2025 list of miscellaneous income tax credits (Form MO-TC) has no credit for home solar, and the federal homeowner credit ended for systems finished after December 31, 2025. Your installer buys the equipment free of sales tax. The property tax exemption for solar was struck down by the state supreme court on August 9, 2022.
Sources, method and corrections
The example uses the EcoGen Solar Cost Index typical Missouri system (September 2026) and our per-utility payback figures of October 30, 2026: each utility’s EIA 12-month price, with its fixed monthly charge taken out where it has one, for power used at home or netted in the month, and the share of output its solar homes leave over at month end, credited at its surplus rate. Seasonal surplus rates are weighted by when panels produce. Output is 1,399 kWh per kW a year. No upkeep and no price rises are counted. Simple payback uses flat first-year values. The calculator sends nothing.
Spotted an error? Tell us through our corrections and feedback process.
- Missouri Revised Statutes 386.890: net metering (netting, credit expiry, capacity limits)
- Ameren Missouri: Sheet 171, net metering rates (checked September 30, 2026)
- Evergy Missouri Metro: Schedule PG, Sheet 31A
- Missouri PSC: order on Evergy’s net metering sheets (Evergy Missouri West rate)
- Liberty (Empire District Electric): Rider NM
- Missouri DNR: Net Metering and Easy Connection Act fact sheet
- Missouri DOR: rule 12 CSR 10-112.020, solar sales tax exemption
- Missouri State Tax Commission: assessor manual on solar property
- Missouri DOR: Form MO-TC, 2025 miscellaneous income tax credits
- City of Columbia Utilities: solar rebates (database row checked September 29, 2026; confirm in a browser)
- U.S. EIA: average residential electricity price by state (12-month average, September 2025 to August 2026)
- IRS: Residential Clean Energy Credit (not available for property installed after December 31, 2025)
- EcoGen Solar Cost Index, September 2026: what solar costs in Missouri (typical system size, price, output per kW and electricity price)
