Utilities. The big electricity, gas, and water companies used to follow a pretty standard playbook: spend lots to build a giant utility plant, spend lots to transfer that utility across a very long distance, then charge lots in order to pay down your infrastructure debt. Today things are changing. As The Economist notes, “Not only are renewables playing a far bigger role; thanks to new technology, demand can also be tweaked to match supply, not the other way round.” New consumption-based digital services like SolarCity are enabling solar-powered homes to sell electricity back into the grid,
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