Power Supply Portfolio

As a local distribution utility, RMLD purchases wholesale electricity from a variety of generating resources to deliver to local homes and businesses. RMLD strives to balance its responsibility to provide affordable electricity to its customers with environmental stewardship when purchasing power supply.


Power Supply by Resource – 2019

The below pie-chart shows the breakdown of resources in RMLD’s power supply for 2019. Carbon consists of power supply resources, such as natural gas and oil, that produce carbon emissions. Non-carbon consists of power supply resources, such as nuclear, hydro, solar, and wind, that do not produce carbon emissions.

carbon vs non-carbon first half 2019

For additional detail on RMLD's power supply contracts including an outlook through 2030, CLICK HERE

“Mixed” Power Supply

The RMLD grid mix referred to in the chart above is a mixed power supply made up of contracts for non-specific resources and real-time spot market purchases. Mixed power supply reflects the general mix of resources available to us from the New England grid.

On average, natural gas and nuclear resources are the most abundant generation source in the New England grid, making up over three-quarters of the total electricity produced. In 2019, approximately 20% of New England’s power supply came from hydro, wind, solar, biomass, and refuse resources. This percentage is expected to increase steadily over the coming years as Massachusetts aims to achieve its carbon emissions reduction goals. A decreasing amount of power in New England—<1% in 2019—comes from coal and oil generators. More information on New England’s electricity resource mix is available from ISO-New England.


Historical Power Supply Portfolio

The amount of non-carbon resources in RMLD’s power supply portfolio has increased steadily since 2010. As existing power supply contracts expire, RMLD will seek to fill these gaps with supply that balances affordability and environmental responsibility.

historical power supply