Green Municipal Aggregation

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

What Is GMA

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. 

Green Municipal Aggregation, or GMA, 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.

Big progress in Rhode Island

Five RI communities are making significant progress in their quest to implement Green Municipal Aggregation (also referred to as Community Choice Aggregation or CCA).

  • Central Falls was the first community in the Ocean State to file a GMA plan with the Public Utilities Commission (PUC).
  • Portsmouth has finished a draft plan and is holding a public hearing in August.
  • Barrington and South Kingstown are finalizing draft plans and preparing to submit them to the PUC in the coming weeks. 
  • Newport recently joined the aggregation movement when its City Council passed an enabling resolution.
  • In July, after a successful public hearing where community members expressed strong support, the Providence City Council approved its CCA plan. The Council also unanimously passed a resolution committing the City to be an anti-racist institution. CCA is one of the program initiatives in the City's Climate Justice Plan!
Watch Providence's excellent videos explaining GMA

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


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, contact

Here is a list of participating communities:

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