Power Supply Portfolio

Power Supply Portfolio


CMLP does not generate electricity; we purchase power from third part suppliers with whom we have "power purchase agreements" which specify the pricing per Kilowatt Hour (kWh) for the power we use. One of CMLP’s objectives in the area of power supply is to purchase as much energy from renewable sources as possible provided the economics are in line with more conventional power supply options.

2020 Purchase Power Budget by Resource Type


Increasing Percentage from Non-Carbon Emitting Sources

How we generate electricity is a huge determinant in achieving Concord’s climate goals. CMLP is committed to providing 100% carbon-free electricity by 2030. Each year, CMLP is working to keep us on track. Achieving that goal will reduce greenhouse gas emissions by nearly 23% community-wide.

During the last several years, CMLP has been de-carbonizing its power supply by purchasing renewable power from developers in Massachusetts, New Hampshire, Connecticut and Maine and purchasing Renewable Energy Certificates (RECs).

In 2019, the Light Plant supplied 62% of its sales from carbon-free resources:  10% from wind, 11% from hydro, 7% from solar, and 34% from the purchase of Renewable Energy Certificates (RECs). We are on-track to meet our goal of 100% carbon-free by 2030.


In addition, CMLP helps customers install their own solar generation through generous grants and a favorable net metering policy. Key to achieving Concord’s climate goals and reducing community-wide emissions will be transitioning our buildings and vehicles to run off clean electricity. CMLP has programs and rebates for both. Learn more about our rebates for heat pumps and electric vehicles.


To learn more about Concord’s commitment to sustainability and climate please visit concordma.gov/sustainability.


Independent System Operation


In addition to our power purchases, we are charged for transmission of power to our Forest Ridge substation by the Independent System Operation-New England (ISO-NE). The ISO is responsible for creating and managing the wholesale market for electricity, operation of the power grid and ensuring adequate capacity in New England. While we are an independent municipal utility, we are part of the larger ISO-NE power grid.