Solar in Missouri

Missouri's residential solar policy centers on full retail net metering, mandated by the Public Service Commission for systems up to 100 kW with an annual true-up. Ameren Missouri, Evergy (Missouri), Empire District Electric, and the cooperatives supplied by Associated Electric all operate under the framework, crediting residential exports at the full retail rate. Customers retain their net-metering terms for the life of their interconnection.

The state's standout incentive is the property tax exemption enshrined in the Missouri Constitution (Article X, Section 6), which exempts solar systems from property tax on their added value — a notably durable protection given its constitutional status. Missouri offers no state income tax credit, no sales tax exemption, and no SREC market. The federal Section 25D residential credit expired December 31, 2025; leased and PPA systems may still access Section 48E for projects that began construction before July 6, 2026.

The policy direction has been stable and supportive, with the constitutional property tax exemption and the generous net-metering cap providing a durable foundation. The principal limitation is the absence of a state tax credit or production incentive, which keeps payback on the longer side despite the favorable export structure.

Missouri's 4.6 peak sun hours put it in the central US norm, with productive summers offset by shorter, often cloudy winter days. The Bootheel delta in the southeast runs marginally above the state average, while the northern tier and the Ozark highlands sit a touch below. Hot, humid summers drive heavy air-conditioning load that aligns well with peak solar output, and winters are cold enough to reduce production but mild enough in day-length terms to keep shoulder-season generation meaningful.

Because Missouri retains full retail net metering with an annual true-up, the optimal strategy is the classic maximize-and-bank model. A south-facing array tilted near latitude (~38–40°) captures the most annual kilowatt-hours, and the summer surplus is banked at the full ~$0.14/kWh retail rate to offset winter consumption. There is no avoided-cost penalty for overproduction, which makes the unusually high 100 kW net-metering cap especially valuable for larger properties.

The lake-effect cloud patterns around the Table Rock and Lake of the Ozarks regions can compress shoulder-season production marginally, but the state is relatively uniform solar-resource-wise. Sizing 100–115% of annual consumption to hedge against future EV or heat-pump load is sensible given the favorable net metering.

Missouri's $2.70/W installed cost is below the national average, with a typical 8 kW system around $21,600 before incentives. The 30% federal residential credit (Section 25D) ended December 31, 2025, leaving the constitutional property tax exemption (Missouri Constitution, Article X, Section 6) as the primary structural offset. Missouri offers no state income tax credit, no sales tax exemption, and no SREC market.

Payback near 14.9 years on the 8 kW model is held back by the below-average retail rate (~$0.14/kWh), which limits the offset value of each kilowatt-hour. An 8 kW system generating about 10,300 kWh a year displaces roughly $1,448 in annual spending at that rate. Households with high consumption — particularly those heating with electricity or adding an EV — see faster payback than the average.

The unusually generous 100 kW net-metering cap and the constitutional property tax exemption are the policy features most worth leveraging. Forward sizing for electrification is the strategy most worth pursuing given the longer payback horizon and the penalty-free overproduction structure.