Renewable energy content detail

Buying renewable energy refers to the purchase of Renewable Energy Certificates (RECs). What are RECs?

Beginning in November 2025

• Economy provides the minimum amount of your electricity from renewable sources required by law.
• Basic Green provides an additional 20% of your electricity from new renewable sources in the New England region (MA Class I RECs).
• Greenest provides 100% of your electricity from new renewable sources in the New England region (MA Class I RECs).

Electricity from renewable sources (% of total)
From new renewable sources in the New England region (MA Class I RECs)
Required by state law	27%	27%	27%	27%
Added by Chelmsford (no biomass)	–	20%	73%	–
Total	27%	47%	100%	27%
From other clean or renewable sources (other RECs)*
Required by state law	36%	36%	36%	36%

Until November 2025

• Basic provides the minimum amount of your electricity from renewable sources required by law.
• Greener provides an additional 40% of your electricity from new renewable sources in the New England region (MA Class I RECs).
• Greenest provides 100% of your electricity from new renewable sources in the New England region (MA Class I RECs).

Electricity from renewable sources (% of total)
From new renewable sources in the New England region (MA Class I RECs)
Required by state law	27%	27%	27%	27%
Added by Chelmsford (no biomass)	–	40%	73%	–
Total	27%	67%	100%	27%
From other clean or renewable sources (other RECs)*
Required by state law	36%	36%	36%	36%

* State law requires all electricity suppliers to purchase Renewable Energy Certificates (RECs) from other sources, including sources that are not new, are renewable but not clean, such as waste to energy, or are clean but not renewable, such as nuclear. This purchase must be made even if the total amount of RECs purchased from either clean or renewable sources exceeds 100% of the electricity used by Chelmsford Choice participants.