The project is worth $1.8bn and uses coal, waste coal and biomass such as waste wood to generate electricity.
The hybrid energy center uses circulating fluidized bed (CFB) clean-coal technology plus emission controls, which according to the company, makes it the cleanest in the nation in terms of emissions.
Energy produced at the energy center can power 146,000 homes in peak demand period.
Dominion CEO David A Christian said the use of low-cost waste coal and biomass will economically benefit the unit and will aid the customers by bringing them monetary savings.