Supporting Renewables - Utilities and electric suppliers are currently mandated by Renewable Portfolio Standards (RPS) and the Clean Energy Standard (CES) to procure a percentage of the electricity they sell from clean energy resources. Visit the Department of Energy Resources website to learn more about these requirements and standards. If you are only interested in greening your electricity supply in order to support local renewable energy development, one way to do this is by purchasing additional Class 1 Renewable Energy Credits (RECs). For example, there are programs available through organizations that will purchase renewable energy credits based on your electricity use at a premium over your utility costs. You can also use Energy Switch MA to find a competitive supplier that incorporates renewable energy as a larger portion of their supply.