Massachusetts rolls out new rules to curb greenhouse gas emissions

Boston — Gov. Charlie Baker’s administration will issue a set of new rules aimed at bringing Massachusetts into full compliance with an ambitious state law that calls for a 25 percent reduction in greenhouse gas emissions by the end of the decade.

The regulations being rolled out on Friday include clean energy requirements for utilities, reductions in carbon dioxide emissions from electricity generating plants, and curbs on methane emissions from natural gas distribution systems. Officials also planned to announce a “lead by example” provision that establishes new fuel efficiency standards for the state’s own fleet of passenger vehicles.

The state launched a review and held public hearings following a May 2016 ruling by the state’s highest court. The justices sided with environmental groups that sued Massachusetts, saying it wasn’t doing enough to meet greenhouse gas limits called for in the 2008 Global Warming Solutions Act.

In addition to the 2020 target of a 25 percent reduction in emissions relative to 1990 levels, the law sets an 80 percent reduction goal by 2050.

“Combating and preparing for the impact of climate change remains a top priority of our administration, and requires collaboration across state government and with stakeholders throughout Massachusetts,” said Baker, a Republican, in a statement planned for release in conjunction with the regulations.

Martin Suuberg, commissioner of the Department of Environmental Protection, acknowledged the rules likely would push consumer electricity bills higher, but by no more than 2 percent a year with increases expected to tail off as