KGRA Energy LP, a U.S.-based waste heat recovery developer, has announced that civil engineering has begun and equipment delivery continues on an innovative clean energy system being installed at a Greenville, NC area mill owned by Weyerhaeuser Company, a forest product company. The project, developed by KGRA Energy, in partnership with Turbine Air Systems Inc., will capture waste heat from the mill and covert the captured thermal energy into clean electricity.