Also in the vicinity of 200 non-municipal electric providing locales of the 351 total Massachusetts municipalities have engaged in aggregation contracts making for longer-term term price stability of more than a year, depending on when the contract was negotiated and whom is the provider, for consumer choice on power providers.

Municipal Aggregation.
https://www.mass.gov/info-details/municipal-aggregation.

Separately state-wide there is choice on power process, in towns without municipal electric companies. Service rates apply for transport distribution of power.

https://www.energyswitchma.gov