On April 19, the Environmental Protection Agency (EPA) proposed a rule on effluent limits for coal ash for power plants, aligning regulatory and implementation requirements. The rule would limit toxic pollutant discharges from coal, natural gas, nuclear, and oil-fired power plants that produce more than 50 megawatts of power. The proposal means the agency may shift away from considering coal ash as a hazardous waste to considering it as a solid waste. Public comment period will be open for 60 days, and already several industry groups, including Utility Solid Waste Activities Group and Headwaters Inc., have expressed support for the rule. A final rule is not expected until after 2013 unless litigation requires the EPA to release the rule sooner.