For years, successive governments in South Australia, backed by radical environmentalists, have trumpeted alternative energies such as wind and solar as the future for the energy-starved state. Leigh Creek township relies almost entirely on the coalmine. Unlike the eastern states, which have plentiful supplies of coal for base-load power generation, South Australia has relatively little coal, and its major deposit is found at Leigh Creek, over 500 kilometres north of Adelaide. The sour…