Missouri is a middle-of-the-road solar state. The sun is decent, the electricity rates are below average, and the state-level incentives are thin. That combination puts solar in the “positive but not exceptional” category. For most Missouri homeowners, solar pays for itself in 11 to 14 years and generates $10,000 to $16,000 in net savings over the 25-year life of the system. Here is the math and the variables that move it.
What Solar Panels Cost in Missouri
Solar in Missouri costs approximately $2.70 to $3.10 per watt before incentives. A typical 7-kilowatt residential system costs $19,000 to $22,000. The federal tax credit covers 30 percent, reducing a $20,000 system to $14,000 after the credit.
Missouri does not currently offer a state-level solar tax credit. A previous state rebate program ended and has not been renewed. The primary state-level benefit is the property tax exemption. Solar systems are exempt from property tax assessment, which means the added home value does not increase your annual property tax bill.
Ameren Missouri and Evergy, the two largest utilities in the state, have offered limited solar rebates in the past but these programs are subject to annual funding and change frequently. Do not count on a utility rebate in your financial calculation. Treat any rebate as a bonus if it is available when you install.
How Much Power Missouri Solar Panels Generate
Missouri receives 4.5 to 5.0 peak sun hours per day averaged across the year. The southern part of the state near the Ozarks receives slightly more. The northern part receives slightly less. This is comparable to North Carolina and slightly better than the Mid-Atlantic states.
A 7-kilowatt system in Missouri generates approximately 10,000 to 11,000 kilowatt-hours per year. This covers most or all of the annual electricity usage of a typical Missouri home, which averages 12,000 to 13,000 kilowatt-hours depending on heating and cooling type. Homes with electric heat pumps will use more and benefit more from solar.
How Much You Save on Electricity
Missouri residential electricity rates average approximately 11 to 12 cents per kilowatt-hour, which is below the national average of 14 to 15 cents. Low rates are the primary reason solar has a longer payback in Missouri than in states with higher electricity costs.
Ameren Missouri and Evergy both offer net metering at the full retail rate. Excess generation is credited at the same rate you pay for electricity, with credits rolling over month to month. At the annual true-up, any remaining credits are paid out at the avoided cost rate, which is lower. Size your system to match your annual usage, not exceed it.
A 7-kilowatt system generating 10,500 kilowatt-hours per year at 11.5 cents per kilowatt-hour saves approximately $1,210 per year. Against a net system cost of $14,000 after the federal credit, the simple payback period is 11.6 years. After payback, the system generates pure savings for the remaining 13 to 14 years of the warrantied life.
Missouri’s Net Metering Policy: Stable for Now
Missouri’s net metering policy has been relatively stable compared to states like California that have made significant changes. The full retail rate net metering structure has not faced the same level of legislative challenge in Missouri that it has in other states. This stability is an advantage. A system installed today is likely to operate under the current net metering structure for the foreseeable future.
Missouri law requires investor-owned utilities to offer net metering to residential customers with systems up to 25 kilowatts. Municipal utilities and rural electric cooperatives are not subject to the same requirement, though many offer net metering voluntarily. If you are served by a municipal utility or a co-op, confirm their net metering policy before committing to solar. Some co-ops offer net metering. Others offer lower export compensation rates that significantly extend the payback period.
25-Year Financial Picture
Over the 25-year warrantied life of the panels, a Missouri homeowner with a 7-kilowatt system can expect net savings of $10,000 to $16,000 after recovering the initial investment. This assumes electricity rates increase at 2 to 3 percent per year. The inverter replacement at year 12 to 15, costing $1,500 to $2,500, is factored into these numbers.
Missouri’s relatively low electricity rates are the limiting factor on solar returns. A kilowatt-hour of solar electricity in Missouri is worth about 30 percent less than the same kilowatt-hour in Maryland. The panels cost roughly the same. The payback is longer and the lifetime savings are lower because the avoided electricity is cheaper. This is the fundamental equation of solar economics, and it is the reason solar makes more financial sense in high-rate states.
When Solar Is Not Worth It in Missouri
Low electricity usage. If your monthly bill is under $80, the dollar savings from solar are too small to justify the upfront cost within a reasonable timeframe.
Heavy tree cover. Missouri’s oak and hickory forests are beautiful but cast dense shade. A roof shaded by mature trees for most of the day produces too little power. Tree removal can add thousands to the project cost.
Moving within nine years. With a payback period of 11 to 12 years, you need to stay in the home long enough to recover the investment. If you sell earlier, you capture some value through increased home sale price but not the full installation cost.
Municipal utility or co-op without full net metering. If your utility does not offer full retail net metering, the payback period extends significantly, potentially beyond the warrantied life of the panels. This is the single largest variable in Missouri solar economics that varies by location within the state.
Old roof. Missouri’s severe thunderstorms, hail, and occasional tornadoes take a toll on roofing. If your roof has less than 10 years of remaining life, replace it before installing solar. Removing panels for a roof replacement adds $3,000 to $6,000.
Frequently Asked Questions
Will solar panels survive Missouri hail?
Yes. Solar panels are tested to withstand one-inch hailstones at 50 miles per hour, which is the industry standard impact rating. Most panels are rated for larger hail than this. Missouri hail storms can produce larger stones, which can damage panels, but this damage is typically covered by homeowners insurance. Confirm with your insurance agent that your solar system is covered under your existing policy. Most standard policies cover roof-mounted solar as part of the dwelling coverage. You may need to increase your dwelling coverage limit to account for the added value of the system.
My electricity comes from a rural electric cooperative. Can I still go solar?
Yes, but the economics may be different. Missouri’s net metering law does not require cooperatives to offer full retail net metering. Each co-op sets its own policy. Some offer full retail net metering. Others offer a lower export rate that reduces solar savings. Contact your co-op directly and ask for their distributed generation interconnection policy before getting solar quotes. If the export compensation rate is significantly below the retail rate, solar may not be financially viable unless you add battery storage to self-consume more of your generation.
