Eversource Energy
PSNH
ISO New England
The United Illuminating Company
National Grid plc
Consolidated Edison
Énergir
Avangrid
Just Energy
Emera
Hydro-Québec
Former utility company in Massachusetts
nstar.com
NSTAR was a utility company that provided retail electricity and natural gas to 1.4 million customers in eastern and central Massachusetts, including the Boston urban area. Wikipedia