By default, your electricity supplier is your utility company. However, in most states (including New York), you can choose from many competing suppliers. You can also choose a supplier of 100% renewable electricity. Little-known fact: Some of the renewable suppliers are sometimes less expensive than the ‘traditional’ suppliers! Looking at the New York State comparison site, and based on actual customer experience, a good choice is Energy Cooperative of New York as your supplier. They have no minimum term (allowing you to cancel or switch providers at any time), and as a not-for-profit, they just seek the best prices for your renewably sourced electricity, without any mandate to maximize revenue or profit. So you can be assured that their primary goal is to save you money.
