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A battery will capture power from braking trains.
Regulations, privacy and security concerns, and other issues could hold back developments.
Attackers could manipulate poorly protected data to make money or cause blackouts.
But some consumers, concerned about rising prices and privacy, would rather their electricity meters stayed dumb.
Installing “smart meters” and upgrading utility networks will force electricity providers to process far more information than they’re accustomed to handling.
Four cities pledge to better manage overall energy use and cut greenhouse emissions.
GE is pushing the smart grid and thin-film solar, but don’t expect new kinds of nuclear reactors.
Sensors track devices’ electricity, water, and gas consumption from one spot.