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Solar Cost in O'Fallon, MO

Estimate residential solar cost, annual production and savings in O'Fallon. Adjust system size, installed price, value captured and verified incentives using local and state 2026 planning data.

Federal residential solar credit in 2026: $0. CalcuRiver does not subtract the expired 30% Section 25D credit from this estimate. Add only local or utility incentives you have independently verified.
Planning solar yield1,427 kWh/kW
Installed-cost benchmark$2.49/W
Federal credit assumed0%
Electricity rateloading…
city solar model

Build your O'Fallon scenario

Start with planning benchmarks, then replace them with your actual quote or roof-specific inputs.

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“Value captured” is deliberately editable because self-consumption, export credits and net-metering rules vary by utility. 100% represents a retail-value ceiling, not a guaranteed bill saving.

How this O'Fallon estimate works

  • Annual production = system size × 1,427 kWh/kW planning yield.
  • Retail-value ceiling = annual production × current Missouri residential electricity price.
  • The value-capture control lets you haircut that ceiling for self-consumption/export economics.
  • Simple payback = entered net installed cost ÷ modeled annual electricity value.

Source boundaries

1,427 kWh/kW-year planning benchmark based on CalcuRiver's Missouri representative-city PVWatts planning value; planning input, not a site-specific roof forecast. Roof orientation, shading, equipment, weather year and utility export compensation can materially change the result.

Production benchmarkCost benchmarkDetailed solar calculator
city-level comparison

Why the O'Fallon result differs

8 kW production11,416 kWh/yr
Vs. state production+0.0%
8 kW benchmark cost$19,920
Retail-value ceiling$1,837

O'Fallon currently uses the Missouri state/regional planning fallback for production and installed cost, so the displayed city and state benchmark values are the same. This page does not claim city-specific roof economics.

Production basis: PVWatts-based state planning benchmark · electricity benchmark: EIA 2026-07.

methodology & sources

O'Fallon solar methodology

Production precision: O'Fallon currently uses the Missouri state/regional production benchmark; no unverified city-specific production uplift is applied.

Production basis

1,427 kWh/kW-year planning benchmark. This page explicitly uses the state/regional fallback rather than claiming site-specific city precision.

Installed-cost basis

2.49 $/W planning benchmark for this city/region; not an installer quote.

Electricity benchmark

16.09¢/kWh Missouri residential benchmark for 2026-07.

Utility boundary

The city page does not assume one electric utility. Use an available city × utility page when the service territory is verified.

Methodology: Solar utility model · CalcuRiver methodology.

why this estimate changes

Why this solar estimate changes

Solar value is driven by local production, installed cost, the retail value of electricity you avoid buying, and the compensation you receive for exported energy. CalcuRiver does not assume export credits equal the retail rate unless that utility program is explicitly verified.

Core logic: self-used solar offsets retail purchases; exported solar is valued only under a verified export-compensation rule.

Methodology & source policy