Solar calculator for Massachusetts

The average Massachusetts home uses 570 kWh a month and pays 29.4 cents per kWh, which puts Massachusetts at among the highest electricity prices in the country, which is what makes solar pay back faster. Winter heating shapes the bill in Massachusetts, and winter is when panels make the least, so a bill that looks big in January does not map cleanly to a bigger array. A south-facing fixed array there makes about 1,302 kWh per installed kW a year, and the worst winter month still gets 2.3 peak sun hours a day. Drop in your own bill below and the numbers on this page are replaced by yours.

A worked example for Massachusetts

Take the average home: 570 kWh a month, which is 6,840 kWh a year, at 29.4 cents per kWh (EIA, 2024 residential averages, as of 2026-11). Sized to cover all of that use, the tool returns 5.3 kWdc and 13 panels, needing about 273 square feet of roof. The installed estimate is $13,081 (national median, EnergySage H2 2025), yearly savings are about $2,011, and simple payback is 6.5 years, with no incentive applied.

Sun and yield in Massachusetts

We use 1,302 kWh per installed kW per year for Massachusetts, from NREL PVWatts v8 for the state's largest city at a 20 degree south-facing tilt (via TheGreenWatt, as of 2026-11). The darkest month averages 2.3 peak sun hours a day, which matters if you plan to go off-grid or size a battery. A different roof angle or heavy shade changes this, so treat it as a starting point.

Incentives

The 30% federal tax credit ended for homeowner purchases after December 31, 2025, so none is applied here. See the tax credit guide. Look up Massachusetts and your own utility for net metering terms and any local programs before relying on a payback number.

Planning estimate. Permits, interconnection approval and a licensed electrician are required for grid-tied systems.

Questions