Program Energy Mix

The information below describes the energy mix for the Chelmsford Choice and Chelmsford Choice Plus.

For more detail, please download the energy mix disclosure label (PDF) from Constellation.

Chelmsford Choice

Chelmsford Choice, the offering you receive automatically unless you chose Chelmsford Choice Plus, includes approximately the same energy mix as National Grid Basic Service, including the same amount of renewable energy. Specifically:

  • 78% from a mix of traditional power sources, including natural gas, nuclear, oil, and coal, among others. (Download the energy mix disclosure label from Constellation for percentages.)
  • 22% from a mix of clean energy sources that must be included to satisfy the Massachusetts Renewable Portfolio Standard (RPS) and Alternative Energy Portfolio Standard (APS). This component is required of all electricity suppliers, including both National Grid and third-party suppliers such as Constellation. These clean energy sources include solar, wind, landfill gas, and others.  Learn about the Massachusetts RPS and APS.

Chelmsford Choice Plus

Chelmsford Choice Plus delivers 100% green energy. It includes 20% more energy from new renewable energy projects than Chelmsford Choice, which puts it 20 years ahead of state renewable energy requirements. New renewable energy projects are those that came into operation after 1998. The purchase of energy from these projects is viewed by many has having greater environmental benefit than purchasing energy from older projects because it puts pressure on the market to build even more renewable energy projects. The specific energy mix for Chelmsford Choice Plus includes:

  • 20% from new Massachusetts wind projects.
  • 58% from wind projects elsewhere in the country.
  • 22% from a mix of clean energy sources that must be included to satisfy the Massachusetts Renewable Portfolio Standard (RPS) and Alternative Energy Portfolio Standard (APS). This component is required of all electricity suppliers, including both National Grid and third-party suppliers such as Constellation. These clean energy sources include solar, wind, landfill gas, and others.  Learn about the Massachusetts RPS and APS.