The measure approved Tuesday increases the cap on the state's net metering program that allows homeowners, businesses and local governments to sell excess solar power they generate back to the electrical grid in exchange for credit.
The increase in the bill equals 2 percent for private facilities and 2 percent for public facilities.
House Speaker Robert DeLeo says that's enough to allow most net metering projects currently in the development pipeline to move ahead.
Solar energy supporters called the bill disappointing, saying it doesn't go far enough and would make it harder for many Massachusetts residents to power their homes with renewable energy.
The bill would have to be reconciled with a version passed earlier by the Senate.