The glowing amber dot on a light switch in the entryway of George Tsapoitis' house offers a clue about the future of electricity.
A few times this summer, when millions of air conditioners strain the Toronto region's power grid, that pencil-tip-sized amber dot will blink. It will be asking Tsapoitis to turn the switch off _ unless he's already programmed his house to make that move for him.
This is the beginning of a new way of thinking about electricity, and the biggest change in how we get power since wires began veining the landscape a century ago.
For all the engineering genius behind the electric grid, that vast network ferrying energy from …
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