Hamilton Community Choice Aggregation

Hamilton CCA is a municipal aggregation, or Community Choice Aggregation, program operated by the Town of Hamilton. With Hamilton CCA, National Grid continues to deliver electricity and manage all electricity billing. The only change is the source and cost of electricity supply, chosen by the town of Hamilton.

Program options

Hamilton CCA has a standard option, Local Green, which has five percent more renewable energy content than required by state law. Participants in the program receive Local Green unless they affirmatively choose one of the other electricity options

Local Green


Includes 5% more Renewable Energy Certificates, than required by the Commonwealth

Local 50% Green


Includes 50% more Renewable Energy Certificates, than required by the Commonwealth

Local 100% Green


Includes Renewable Energy Certificates equal to 100% of the user’s electricity consumption, in addition to meeting all renewable energy requirements



Meets all Renewable Energy Certificate requirements

Hamilton CCA pricing will be in effect from December 2020 through December 2023. 

Products described as Green contain renewable electricity above that required by state law. The additional renewable electricity qualifies for MA Class I designation and comes only from solar, wind, anaerobic digestion and low-impact hydro located within New England. Local refers to New England.

All of the additional Renewable Energy Certificates (RECs) included in the program are designated as MA Class I. RECs are the accepted legal instrument used to track renewable energy generation and to substantiate claims of renewable energy use. Learn more about the RECs that are included on the Renewable Energy page.

National Grid Basic Service Rates

$0.14821/kWh for Residential, November 2021 – April 2022
$0.13113/kWh for Commercial, November 2021 – April 2022
$0.17336/kWh for Industrial, November 2021 – January 2022

Future savings against National Grid’s fixed Basic Service rate cannot be guaranteed because National Grid’s rates change every six months for residential and commercial customers and every three months for industrial customers.

Goals of Hamilton CCA program

Competitive, Stable Price

Using strategic purchasing, combined with the bulk purchasing power of thousands of households and businesses in the program, Hamilton CCA provides competitive, stable rates. Please note, savings compared to National Grid Basic Service cannot be guaranteed because Basic Service prices change every six months for residential and commercial customers and every three months for industrial customers.

Support Renewable Energy Sources

CCA’s standard product and optional products include more renewable energy than required by the Commonwealth. This means you can support the growth of renewable energy generation in our region. Learn more about our renewable energy options.

Increased Choice and Easy Participation

The program offers 4 different options for electricity supply so that everyone in Hamilton can find an option that fits their budget and climate goals.

Participants in CCE may leave the program at any time without penalty.

Solar Electricity Consumers will continue to receive their net metering credits while participating in the program.

Budget Plan or Eligible Low-Income delivery rate consumers will continue to receive those benefits from the utility.

How to Participate in Hamilton CCA

Most residents and businesses in Hamilton already participate in the CCA program. Check your electricity bill to see if you’re one of them: the Supplier should be listed as Constellation – Hamilton CCA (click for a bill sample). If National Grid is still listed as your supplier, you may complete the enrollment form to sign up for Hamilton CCA. If a different supplier is listed, contact that supplier to check for penalties or termination fees that they may charge before you join the CCA program.

Participation in the Hamilton CCA program is voluntary: you can leave the program at any time without fee or penalty.

The program will periodically send Customer Notification letters to new or newly eligible electricity customers, which includes the program details, information about product prices, and renewable energy certificates. Customers who receive this letter and do not choose to opt out will be automatically enrolled. To enroll sooner, use our online form.

Questions & Support

Have questions or need help? Please visit the support page, which contains the contact information for the current program supplier and a form for comments.