The average cost to install solar on a home in New Hampshire is $3.91 per watt, with about 80 percent of systems installed for $3.13 per watt to $4.97 per watt. This is lower than the average solar cost in the New England Region of $4.50 per watt.
The average size of a solar system in New Hampshire is 7.3 kilowatts, which would cost around $28,500 without any federal, state, or local incentives.
1 kilowatt of solar PV in New Hampshire produces an average of 1,305 kilowatt-hours of electricity per year, so a 7.3 kilowatt solar system would generate 9,524 kilowatt-hours of electricity every year. An average household in New Hampshire uses 7,452 kilowatt-hours of electricity in a year.
With an average state electricity price of 18 cents per kilowatt-hour, this solar system could save a household in New Hampshire $1,748 each year. At this rate of annual savings, the system could pay for itself in about 16 years assuming no additional system expenses. This is less than the expected 30-year lifespan of a typical solar panel.