Sizzling temperatures across the UK make most of us think of barbecues, swimming or sun-tan lotion. But in part of South London, the thoughts of Agamemnon Otero are on the kilowatts per hour being generated on local rooftops. "It's a great summer to install solar panels," he says. "On a day like today, in the full sun, we'll be creating more energy than all these buildings need." But his enthusiasm is not only a result of Britain's soaring temperatures. A series of government incentives is making the summer of 2013 a prime time for communities to get together to make renewable energy. And energy is the least of it. Schools, churches and sports clubs are not...
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