Approximately 50 percent of CVPS's total energy supply comes from renewable resources - primarily hydro, with some contribution from wood-fueled power plants.  Much of CVPS's remaining supply is nuclear power, with only a few percentage points typically coming from fossil fuel plants in a given year.  When individual consumers purchase CVPS Cow Power™, each kilowatt-hour paid for will displace some other form of generation, such as fossil fuel plants elsewhere in New England.  Electrons on the wires are indistinguishable from one another, but Cow Power customers will be supporting renewable energy and supplanting other forms of generation.