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"A false data injection attack is an example of technology advancing faster than security controls," explained nCircle spokesperson Elizabeth Ireland as quoted in Homeland Security News Wire. "This is a... key reason for the significant cyber security risks we face across many facets of critical infrastructure."

“Many older [smart] meters were not designed to adequately protect against false data injection," said Patrick Miller, the founder, CEO, and president of survey co-sponsor EnergySec, a DOE-funded public-private partnership. "It does not help that some communication protocols... don’t offer much protection against false data injection either. Together, these facts highlight a much larger potential problem with data integrity across the smart grid infrastructure."

Have you read this one? 

FBI says smart meter hacks on the rise (and all you need is a magnet?)