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CLOVER PRESENTATIONClover Power StationWelcometo theHow It All StartedA brief history of the Clover Power Station♣In 1989, Old Dominion ElectricCooperative and Dominion team up toconstruct Clover Power Station♣In February 1992 Construction Commences♣Unit #1 began commercial operations in thefall of 1995 and Unit #2 in the spring of1996.How It All Works♣Coal is delivered by train from Virginia mines♣Clover consumes approximately 90 rail cars ofcoal per day when the units are at full capacity.♣Fuel oil is used for start-up then we switch to coalto heat the water to steam to drive the turbine andgenerator♣Each of our two units produces approximately 430Net MW of electricity which is enough to powerapproximately 100,000 homes.Keeping It CleanOne of our major concerns is the impact that we haveon the environmentOver $400 million of the $1.2 billion plant costs was spent onequipment to ensure that this station maintains compliance withits regulatory permitsTwo major pollution control measures used at Clover are thebaghouses and wet limestone scrubbersIn addition, an SNCR may be used during the ozone season andbeyondThe BaghouseThe Baghouse♣The baghouse acts as a filter that removes the ashfrom the flue gas before entering the scrubbersystem♣This very efficient process takes 99.9% of theash out of the flue gas♣The ash is transported to a silo then to the pug millwhere it is mixed with the scrubber byproduct andwater before being placed in our on-site landfillThe Scrubber♣The scrubber removes the sulfur dioxide that is producedas a result of burning coal♣This is done by mixing the hot flue gas with a slurry oflimestone and water♣Our typical removal rate is approximately 96% althoughthe permit limit is 94%♣Adipic acid is also used to improve removal efficiency♣Forced oxidation air is supplied to all of the vessels toassist in forming a sulfate product instead of sulfite whichis easier to dewater♣Refer to scrubber process diagramSelective Non-Catalytic Reduction• Dry Urea is made intoan aqueous solutionand injected into thefurnace for NOxReduction.• Results in anapproximately 25%reduction.This is the basic overview of the stationWastewater Treatment Systems♣All oil tank secondary containmentsand floor drains that have thepotential for receiving oil spillsdrain through oil/water separators♣All bulk chemical tank secondary containments drain to lift stationsthen to the neutralization basin♣All sanitary wastes are routed tothe on-site sanitary treatment plant♣Cooling tower and boiler blowdown,sanitary waste treatment plant,oil/water separators and neutralization basin discharge to the holdingpond before release to the Roanoke River.♣Limestone storage pile, the coalpile and coal combustion byproductstackout areas drain to the coal/limestone pile runoff pond beforerelease to the Roanoke River♣The landfill wastewater treatmentsystem consists of 4 leachatecollection basins and 7 stormwaterrunoff sediment ponds. Leachate ispumped to river through a 2.34 mileforcemain and the sediment pondsdischarge to Black Walnut Creek.♣5 stormwater runoff discharges inaddition to the 7 landfill ponds♣Refer to wastewater process diagramSome interesting facts about theClover Power StationThe power station withdraws water from the river and pumps itto the raw water storage pond. Fromthere, it is clarified and thebulk of which is routed to the cooling towers as make-up for theapproximately 9-10 MGD they evaporateThe remainder is routed to the water treatment plant for furtherpurification and used throughout the plant in various systemsincluding boiler water make-up, service/fire waterThe scrubber receives its water needs from the holding pond aswell as the 2 emergency sludgestorage ponds and accounts forapproximately 1 MGD of evaporative losses through the stacksSome other interesting factsabout the Clover Power StationThe Clover Power Station employsapproximately 140 workers, is base loadedand remains in operation year roundThe station is located on 1800 acres of landof which approximately 500 acres aremanaged wetlandsWe have an on-site landfill with the currentcell occupying approximately 30 acres.Tour Reminders♣Please remain with your tour guide at alltimes♣Feel free to take pictures and ask questionsbut please refrain from including employeesin photos.

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CLOVER PROCESS FLOW DIAGRAMS