Edison Mission Energy is planning a $700 million environmental upgrade at the 1,884 MW Homer City coal-fired power plant in Pennsylvania.

EME said in The (Johnstown, Pa.) Tribune-Democrat that it plans to add scrubbers to reduce mercury, sulfur dioxide and particulate emissions on the two units at the plant that began operating in 1969. A third unit built in 1977 had a scrubber installed about ten years ago.

Environmental groups and agencies such as the U.S. Environmental Protection Agency and the Pennsylvania Department of Environmental Protection sued plant owners in 2011, but a federal judge in Pittsburgh dismissed the lawsuit, saying some of the claims were too old and others were superseded by state and federal laws.

EME said it plans to begin work in spring 2012 and complete it by 2014.

Read more air pollution control equipment and services news