Your savings estimate
25-Year ROI Timeline
With a 8.8-year payback, your system spends 16.2 years in profit after breaking even.
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Maine vs National Average
How We Calculated This
Our solar ROI calculations use data from the National Renewable Energy Laboratory (NREL) PVWatts API, which models solar energy production based on location-specific solar irradiance, weather patterns, and panel tilt angles. We assume a standard 6kW residential system with south-facing panels at optimal tilt.
Electricity rates are sourced from the U.S. Energy Information Administration (EIA). Annual savings are calculated by multiplying estimated production by the local electricity rate. The ROI score represents total 25-year savings divided by system cost.
These estimates do not include the federal 30% ITC tax credit, state incentives, SRECs, or utility rebates, which can significantly reduce the effective payback period.
Solar ROI by Zip Code in Maine
Explore solar data for specific zip codes in Maine. Click any zip code for a full local breakdown.
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Solar Outlook for Maine
Maine receives 4.55 kWh/m²/day of solar irradiance — 8.3% below the national average. At $0.222/kWh electricity, the 8.8-year payback period represents a solid return on the solar investment.
Solar Equipment Worth Considering
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