LUMBERTON — The Southern Environmental Law Center filed a lawsuit Wednesday alleging Active Energy Renewable Power polluted the Lumber River, a violation of the Clean Water Act, according to the conservation group. The law center is suing on behalf of the Winyah Rivers Alliance, a nonprofit coalition of riverkeepers working to protect local rivers in the state. The complaint, filed in U.S. District Court for the Eastern District of North Carolina, details the concerns of the environmental groups and residents regarding unpermitted discharges of wastewater into the river and its tributary, Jacob's Branch, by Active Energy's property in Lumberton that is contaminated with hazardous substances.