Local clean energy for WinPower

WinPower is committed to supporting the growth of new, local renewable energy in our region. The State of Massachusetts has progressive policies that require everyone to use more renewable energy over time, however, the pace of change needs to be faster to mitigate the effects of climate change. WinPower is leveraging the buying power of our community to bring more clean electricity to our residents and businesses. 

A Green Option for Everyone

Winchester’s standard option, WinPower Standard, has 10% extra renewable energy included, above and beyond the State requirements. 

Participating in WinPower Standard makes you a climate leader. We also offer an electricity option that adds 100% clean energy to let you take an even bigger step in the fight against climate change. 

Sign up for 100% clean energy!

The Sources of Extra Renewable Energy 

All of the extra renewable energy in the WinPower program qualifies as MA Class I, and is provided through the local non-profit, Green Energy Consumers Alliance. Purchasing through Green Energy Consumers Alliance provides two important benefits for our renewable energy:

From  New England 

MA Class I renewable energy can come from New England or adjacent parts of Canada and New York. WinPower sources its extra renewable energy exclusively from within New England. We’re helping to keep our energy impact local, supporting New England’s clean energy economy. See below for a map of sources.

From Zero-Emission or Methane-Destroying Sources

WinPower’s extra renewable electricity only comes from zero emission sources, such as solar, wind, low impact hydropower1, and sources that destroy methane, such as anaerobic digestion. Methane has a global warming potential (GWP) 28-36 times greater than CO2 over a 100 year period2. Combustion destroys methane and releases some CO2, resulting in a net reduction in GWP. Other forms of biomass are explicitly not purchased, due to their positive emissions of CO2 during their life cycles.

Resources that are part of the Green Energy Consumers Alliance portfolio.

Helping to Build Clean Energy

Massachusetts requires all energy suppliers to include a minimum amount of MA Class I renewable energy that increases annually. If the supplier does not meet these requirements, the supplier is required to pay a penalty. This policy, called the Renewable Portfolio Standard, provides growing demand for renewable energy, which incentivizes new renewable generation facilities to be built. By purchasing a significant quantity of extra MA Class I renewable energy, Hamilton is incentivizing even more renewable energy generation development in New England.

How big is our impact? 

In 2019, WinPower bought a 4,224 MWh of extra MA Class I renewable energy, above and beyond State requirements. These voluntary purchases are about equivalent to the annual production of a typical wind turbine (1.5 MW each). 

Many other cities and towns are joining with Winchester to implement the same type of electricity aggregation program, amplifying the impact on the renewable electricity market. In fact, recent estimates suggest that fully 10% of the entire MA Class I markets will soon be voluntarily purchased by municipal aggregations, like WinPower, going above and beyond state requirements. 


1Hydro projects that do not exceed 30 MW built after 1997 or have capacity additions or efficiency improvements made after 1997 (MA Class I eligible), and Low Impact Hydro Institute (LIHI) certified.

2Environmental Protection Agency. Understanding Global Warming Potentials.  https://www.epa.gov/ghgemissions/understanding-global-warming-potentials