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Solar cell is a fast moving technology, a Swiss company recently set a record conversion for sunlight to electricity over 20%, it has a future. 'Open land for food growing in future may be needed..' okay but this is the last place to put a solar installation anyway. Maybe somewhere like Spain they have plenty of space for open air installations. We should encourage use of derelict greenhouses for renewable power ie. solar PV, most of which probably belong to people with no intention of ever growing any food. The States should also introduce laws mandating minimum standards for renewable energy provision on new builds including and starting with the schools. I agree about using commercial buildings too, there needs to be an objective, a target for x amount of renewable by year x.... from our leaders. We can talk until the cows some home..