Graycor Industrial Constructors recently began work for an environmental retrofit project at American Electric Power’s (AEP) 1,745-megawatt coal-fired generation facility in Conesville, Ohio, located approximately 70 miles east of Columbus. The two-phased project involves installation of flue gas desulfurization (FGD) and selective catalytic reduction (SCR) systems that will reduce sulfur dioxide and nitrogen oxide emissions from the plant’s Unit No. 4. Phase I entails substructure work including foundations, underground utilities, roadways, site grading and surfacing. The second phase of the project involves all superstructures supporting the FGD and SCR systems, as well as all associated equipment and buildings.