Hamilton Community Choice Aggregation

Hamilton CCA, or Community Choice Aggregation, is a municipal electricity bulk-purchasing 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

The aggregation program for Hamilton has been renewed for an additional term through late fall 2025. New pricing, shown below, will go into effect starting December 2023. The program’s supplier will transition from Constellation to Dynegy.

Most customers do not need to take any action to receive the new pricing. However, due to requirements from the Department of Public Utilities, customers currently in the 50% and 100% Green products must affirmatively re-enroll or their accounts will be returned to Basic Service. You can enroll by contacting the supplier, Dynegy, at (866) 220-5696 or submitting a request through the enroll form below.

Questions about the changes? Watch a recording of our virtual info session here.

New Program prices starting December 2023 compared to utility prices

Hamilton Standard
(community default)
Hamilton Basic Hamilton Plus National Grid Basic Service
15.148 ¢/kWh
All Rate Classes
14.950 ¢/kWh
All Rate Classes
16.455 ¢/kWh
All Rate Classes
18.213 ¢/kWh
All Rate Classes
Adds 5% voluntary
renewable energy
(MA Class I RECs)
No additional
renewable energy
Adds voluntary
renewable energy
(MA Class I RECs)
to total 100%
No additional
renewable energy
December 2023 through November 2025 November 2023 through
July 2024

Hamilton CCA Pricing until November 2023

Local Green

$11.206 ¢/kWh

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

Local 50% Green

12.713 ¢/kWh

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

Local 100% Green

14.388 ¢/kWh

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


11.038 ¢/kWh

Meets all Renewable Energy Certificate requirements

Hamilton CCA’s standard option 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

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

18.213 ¢/kWh for Residential: November – April 2024
17.262 ¢/kWh for Commercial: November – April 2024
21.450 ¢/kWh for Industrial (NEMA): November – January 2024

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 & 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.