Solar power in Maine on rooftops can provide 24% of all electricity used in Maine. A 2012 estimate suggests that a typical 5 kW system costing $25,000 before credits and utility savings will pay for itself in 14 years, and generate a profit of $24,683 over the rest of its 25 year life.
Net metering is available to all consumers for up to at least 100 kW generation. Excess generation is rolled over each month but is lost once each year. Maine is given a B for net metering and an A for interconnection.
In October 2007, Maine's largest solar array was the 15.12 kW solar array installed at Maple Hill Farm in Hallowell for $166,000, which through June 11, 2012 has generated 73,416 kWh. Since then average solar costs have dropped substantially, and continue to decline.