Nuvera Fuel Cells, a fuel cell power and hydrogen supplier, has reached a deal with building owner KBS Realty Advisors to extend its full occupancy lease at 129 Concord Rd. in Billerica, MA for an additional eight years.

The company has occupied the 110,864-square-foot, two-story flex facility since 2007, according to CoStar information.

The property was constructed in 1983 within the Rivertech business park and last underwent renovations in…