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Plans to build one of the UK's first large-scale geothermal power stations in Cornwall might come a step closer on Thursday. Geothermal Engineering Ltd wants to drill three big holes, each about three miles deep, at the United Downs industrial estate at Carharrack, near Redruth. Eventually, they say, the hot rocks will generate 7MW for the National Grid and provide an additional 7MW of heat for local use. Planners will probably opt for a site visit before coming to a decision in the weeks and months ahead.