Battery Storage in Maine

A home battery system in Maine costs $10,000-$18,000 installed before incentives. The Efficiency Maine provides up to $4,000 in state rebates, bringing the net cost to $6,000-$14,000. With the state average electricity rate at 18.4¢/kWh, battery storage helps offset expensive peak-hour grid electricity.

A home battery stores solar energy during the day for use at night and during outages. When paired with solar panels, battery storage allows Maine homeowners to dramatically reduce grid dependence and protect against rising utility rates.

The federal residential energy storage tax credit (Section 25D) expired December 31, 2025. Homeowners purchasing batteries with cash or a loan no longer receive any federal tax credit. State, utility, and demand response programs are now the primary way to reduce your battery investment. Third-party owned systems (leases and PPAs) still qualify for 30% under Section 48/48E.

Maine averages 18 hours of power outages per year. A single 13.5 kWh battery powers essential loads for 10-12 hours, while two batteries provide whole-home backup. Browse the 7 utilities and 91 towns below for utility-specific battery incentives and rates.