Energy

Subsidiaries of Saint-Gobain Corp. have settled with the U.S. Environmental Protection Agency for alleged violations of the Clean Water Act and will invest in environmental upgrades, the EPA announced Tuesday.

The largest regional transit authority in Massachusetts has purchased three 40-foot buses that produce no tailpipe emissions from the company that sold similar buses to Worcester in 2013.

Joseph's House, a 140-unit apartment complex in Fitchburg, has received $290,000 in upgrades through Unitil and the MassSave program.

Framingham's Ameresco has begun construction of a 2.4 megawatt solar array being installed for the town of Sturbridge.

The Gardner Redevelopment Authority and the City of Gardner are undertaking a $1.8-million cleanup of a former metals facility as the groups continue to prepare the area for commercial investment.

Worcester's 28,600-solar-panel project estimated to save the city more than $50 million over the course of 30 years is well over halfway complete.

Hopkinton's commercial-scale solar company Solect Energy announced Tuesday it is expanding into Connecticut and has hired a new director of business development.

Enercon Technologies is quietly making its mark on many high-tech products sold by Boston Scientific and other companies throughout the world.

A Bethel, Maine clean energy provider is hosting a grand opening on Friday for a showroom and distribution facility in Oxford that will serve Massachusetts, marking the company's first location in the state.

Westborough's Ameresco has completed a $12.45 million Energy Savings Performance Contract (ESPC) that resulted in more than 5 megawatts of solar being installed on the rooftops of 11 schools in Tennessee.