New Scientist: “I HAVEN’T paid an electricity bill since 1970,” says Richard Perez with noticeable glee. He can afford to be smug. While most of us fretted over soaring utility bills this year, he barely noticed. Nor is he particularly concerned about forecast price hikes of 30 to 50 per cent in 2009. Perez, a renewable-energy researcher at the University at Albany, State University of New York, lives “off-grid” – unconnected to the power grid and the water, gas and sewerage supplies that most of us …