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Wind Energy Development Significant potential for additional renewable energy development in Tasmania is brought by the winds of the Roaring Forties, the prevailing westerly winds that circle the earth’s southern latitudes. The wind resource is amongst the best in the world and is presently largely untapped. In the north-western corner of Tasmania, Hydro Tasmania is planning to develop what will be one of Australia’s largest wind farms. Around 70 turbines will eventually be installed, giving a total generating capacity of 130 MW. The first 10.5 MW stage is scheduled for completion by May 2002. The synergy between hydro power and wind power offers improved returns compared with stand alone wind developments. When the wind blows, energy can be stored in Hydro Tasmania’s substantial water storages by curtailing hydro turbine operation, and when the wind is calm the fast response hydro plant can supply the market. This mechanism enables energy production to be shifted to the most valuable time of the day, thereby targeting premium priced peak demands. The King River Power Development is an ideal example of a scheme that will contribute strongly to an integrated hydro and wind operation. 10. OPERATING CONSIDERATIONS Hydro Tasmania has put considerable effort into understanding the interactions of power station operations with downstream water quality and tailings transport, particularly in light of the growing aquaculture industry in the receiving waters, Macquarie Harbour. Downstream of the power station the King River carries the heavily polluted inflows from the Queen River tributary, on which the Mount Lyell Copper Mine lease is located. For 78 years the Mt Lyell copper mine directly discharged its tailings into the Queen River at Queenstown. Most of the tailings have been washed down to Macquarie Harbour via the Queen and King Rivers to form a large delta, but a considerable storage still remains in the bed and banks of the lower King River. Discharge of tailings in the river ceased in December 1994 when a tailings dam was built. Power station operations affect the transport and deposition of tailings and the metal-laden acid drainage arising from lease site run-off. Hydro Tasmania was a major contributor to a large-scale environmental investigation program in the lower King River and Macquarie Harbour between 1992 and 1995. The King River-Macquarie Harbour Environmental Study was a collaborative study of the Tasmanian Department of Environment and Land Management, the Mount Lyell Copper Mine, and Hydro Tasmania. It involved extensive water quality surveys, sponsorship of a Ph.D. study into storage and transport of the mine tailings, and hydro-dynamic and water quality monitoring in Macquarie Harbour. Arising from these investigations was the essential understanding of how power station operating patterns influence patterns of pollutant transport to the downstream environment. An important consideration is the highly successful aquaculture industry in Macquarie Harbour, producing Ocean (rainbow) Trout and Atlantic Salmon. ‘Worst case’ conditions for the fish farms are well understood and can be avoided by strategic operations of the station.PDF Image | Organisations in Different Renewables
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