It is a state program that one of the sources for funding for it is utility companies, it was overhauled last year by the state:

>This week, Massachusetts approved a major overhaul of the Mass Save program, the state’s leading energy efficiency program and best tool to help residents kick fossil fuels and lower their utility bills. The dense, 343-page order lays out a three-year plan for 2022 through the end of 2024, and it is full of rebates, interest-free loans, free efficiency upgrades, and other incentives aimed at making homes across the state more efficient and resilient.

Source: https://www.bostonglobe.com/2022/02/02/science/what-new-mass-save-rewrite-means-you/?event=event12