Sheerness Generating StationWater Consumption and Use Red Deer River Watershed Alliance
Background Information • Sheerness Station is co-owned by ATCO Power and TransAlta Utilities. • ATCO Power manages and operates the facility. • The Station employs approx. 125 people with about another 100 employed by the supporting coal mine (Prairie Mines Royalty ).
Background Information • Two turbine/generators, 408 MW Gross ea. • Each boiler produces 1,125,000 kg (2.5 million pounds) steam per hour at 17.2 MPa (2,500 psi) and 536°C (997°F). • Station maximum output is 780 MW Net. • Consumes approx. 11,000 tonnes coal/day.
Water Source • Pumphouse on the Red Deer River approx. 40 km SW of the generating station into a pipeline. • Pipeline supplies water for agricultural users and the Henry Kroeger Regional Water Commission. • Remainder to the 475 hectare cooling pond. • Water from cooling pond released into ESRD’s (Alberta Environment and Sustainable Resource Development) blowdown canal.
Red Deer River Pumphouse • Three pumps: 2,600 KW each. • Capacity: 7110 m3/hr. (1.975 m3/s). • Diversion: Calculated from pump flow curves. • Typically one or two pumps operate but occasionally three. • Diversion only during warmer months. • Average diversion since 2007 is approx. 16,780,000 m3 annually.
Water Licence (Pumphouse) ATCO Power Licence • Allocation: 22,000,000 m3 annually. • Rate of Diversion: 2.5 m3/s. • Average diversion since 2007, approx. 16,780,000 m3 annually. ESRD (Alberta Environment) Licence • Allocation: Additional 13,800,000 m3 annually. • Rate of Diversion: Incorporated into the licence issued to ATCO Power.
Public Use • Withdrawals from the pipeline and the blowdown canal for agriculture. • Potable Water for Hanna, Oyen, and surrounding communities produced by the Henry Kroeger Regional Water Commission. • Recreation at Prairie Oasis Park.
Generating Station Use • At full load: 2.5 million pounds of steam per hour for each turbine. • Largest use: cooling water for main condensers, necessary to condense steam for reuse in boilers. • Approx. 25,200 m3/hour recirculated through pond. • Average pond evaporation since 2007 is approx. 9,206,000 m3 annually.
Other Station Uses • Demineralized water production for boilers and turbines. • Potable water for station personnel. • Demineralized water and potable water approx. 221,000 m3 annually.
Blowdown Canal (BDC) • Water released from cooling pond for agriculture. • Flows into ESRD’s blowdown canal to Carolside Reservoir. • Crown Entitlement based on the water licence. • Calculated from a base volume of 2,500,000 m3 + 1.12 m3/gross MWh. • Average release since 2007 is approx. 7,753,000 m3 annually.
BDC Water Analysis • What’s in the River is in the Cooling Pond. • Samples collected from: -Red Deer River -Cooling Pond. -Blowdown Canal. • Samples sent to commercial lab for analysis. • Both required and voluntary performed. • ESRD Approval specifies monitoring and reporting on the blowdown canal. • An Approval is like a licence.
BDC Water Quality • Continuous Monitors: pH, temperature and flow. • Visual Checks: signs of oil, solids, or foaming. • Weekly Samples: Fe, Total P, TDS, TSS. • Monthly Samples: COD, (NO3+NO2)-N, TKN, Dissolved O2. • Semi-annual Samples: Al, As, B, Cd, Cr, Hexavalent Cr, Co, Cu, Fe, Na, Pb, Mn, Hg, Mo, Ni, Se, Ag, V, Zn, Ca, K, Cl, SO4, Reactive Silica, Total Alkalinity, Conductivity, Turbidity, Total Hardness, TOC, Colour.
Water Balance Water Into Cooling Pond • Water diverted from the Red Deer River. • Pipeline withdrawals. • Annual rainfall and snowfall. Average since 2007 is approx. 1,592,000 m3 annually. Water From the Cooling Pond • ESRD blowdown canal allotment. • Water consumed at the Generating Station. • Cooling pond evaporation. • Cooling pond volume change.
2013 Water Balance Crown Entitlement: 8,532,673 m3 To the Cooling Pond • Total Diverted: 16,982,679 m3 • Total Pipeline Withdrawals: 1,537,229 m3 • Total Pumped to Cooling Pond: 15,445,450 m3 • Total Rainfall: 1,456,333 m3 From the Cooling Pond • Total into Blowdown Canal:7,685,345 m3 • Total Consumed by Power Station: 220,825 m3 • Total Evaporated from Cooling Pond: 8,904,964 m3 • Change in Cooling Pond Volume: +90,649 m3