Green Municipal Aggregation

Artist - Erin MacEachern

Original artwork by Erin MacEachern

Also known as community choice aggregation (CCA), this model allows MA & RI communities to take climate action by greening up residents' electricity supply.

Read: Green Municipal Aggregation in MA, 2nd edition, released Feb 2020

Green Energy Consumers' new paper explains the nuts and bolts of GMA and how a growing number of Massachusetts communities are using it to drive demand for new renewable energy sources.

We have worked hard to spread GMA to Rhode Island. As a result of successful changes to state law and concerted outreach and education to cities and towns, we will soon be able to report on big progress. Stay tuned.

Read the Massachusetts report

Massachusetts and Rhode Island state laws allow a city or town to choose the electricity supplier for residents and businesses within that municipality. This is called municipal aggregation or community choice aggregation. It allows for important energy decisions to be made at the local level rather than by an investor-owned utility or by a for-profit competitive electricity supplier. 

GMA, Green Municipal Aggregation, is a model we devised with energy broker Good Energy that adds more Class I or "new" renewable energy to residents' electricity at a competitive price. When a community decides to enact GMA, it goes out to bid for an electricity supplier and secures a long-term price and a cleaner electricity supply. That supplier replaces the utility's Basic Service, offers a more stable price (usually cheaper in the long run, too), and adds more renewable energy than required by state law.

Here is a list of communities currently participating in GMA and being supplied with additional renewable energy by Green Energy Consumers.

Name Renewable electricity (added by default) Supplier (what you'll see on your electric bill) Website
Arlington 11% Direct Energy Services
Bedford 5% Dynegy
Brookline 30% Direct Energy Services
Dedham 5% Public Power, LLC
Gloucester 5% Direct Energy Services
Hamilton 5% NextEra
Medford 5% Dynegy
Melrose 5% NextEra
Rockland 5% Dynegy
Somerville 10% Direct Energy
Stoneham 5% NextEra
Sudbury 5% Dynegy
Winchester 10% Dynegy



How do I get my community involved?

If you’re interested in learning more about GMA or want to find out how your community can get started: