Waste energy is generated from waste-to-energy plants, which burn solid waste at extremely high temperatures to produce electricity. The Massachusetts Renewable Portfolio Standard (RPS) relegates waste energy to Class II, in a separate category from Class II renewables. The RPS obligation for Class II Waste Energy is currently set at 3.5% of total electricity in Massachusetts. Plants must meet MA Department of Environmental Protection regulations in order to qualify to produce RPS Class II Waste Energy certificates (WECs). 50% of revenue generated from the sales of WECs is channeled into local recycling programs. In 2010, qualifying waste energy units in Massachusetts generated 284 MWs of electricity. Read more.