The combined-cycle unit at Possum Point consists of two combustion turbines and a steam generator. The combustion turbines are basically large jet engines. Forced air, super-heated by natural gas, turns a turbine to generate electricity. Exhaust from the combustion turbines is captured and used to produce steam to power another turbine. By recapturing the waste heat, combined-cycle units burn less fuel and produce fewer emissions than comparably sized conventional units.
Dominion has a mixed portfolio of generating units, including carbon-free nuclear, hydro and wind, natural gas, biomass, coal and oil. As a result, Dominion has a smaller carbon footprint as compared to other energy companies. According to a Natural Resources Defense Council study, Dominion emits almost one-third less carbon per unit of energy than the median of
the nation's 100 largest power producers. Dominion has been reducing its carbon dioxide emissions for several years. In 2003, the company retired two oil-fired units at Possum Point Power Station in Northern Virginia, replacing them with 550 megawatts of new state-of-the-art, natural gas, combined cycle technology. Natural gas units emit up to 60 percent less carbon dioxide
than a similar sized coalpowered generating unit. Since 2000, Dominion has added nearly 3,600 megawatts of new gas-fired generation (excluding Possum Point), more than 2,500 megawatts of non-greenhouse gas emitting nuclear generation.
Friday, June 20th: Tour of Possum Point Power Station
Friday, June 20 from 10:00
AM to 1:30 PM EDT
Possum Point Power Station
(near Quantico Marine Corps Base)
Dominion's Possum Point Power Station is a 650-acre site located approximately 30 miles south of Washington, D.C that overlooks the Potomac River and the Quantico Creek.
There are four generating units; two of which are natural gas fired, one is oil fired, and the other is a dual fired combined-cycle unit. Both Units 3 & 4 are fired using natural gas but were converted from coal in May of 2003. Unit 3 generates 96 MW and Unit 4 generates 220 MW. Unit 5 is a 786 MW oil-fired unit (#6 low sulfur oil), and Unit 6 is the most recent unit to Possum Point fired by both natural gas and no. 2 oil. Unit 6 is a 559 MW combined-cycle unit that went commercial in July of 2003. It is reliable, efficient and environmentally friendly.