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Four cities pledge to better manage overall energy use and cut greenhouse emissions.
Attackers could manipulate poorly protected data to make money or cause blackouts.
A battery will capture power from braking trains.
The technology could open up all kinds of opportunities for attackers, researchers say.
One researcher shows how your house’s power could be shut down remotely, but the threat is only theoretical–for now.
GE is pushing the smart grid and thin-film solar, but don’t expect new kinds of nuclear reactors.
Regulations, privacy and security concerns, and other issues could hold back developments.