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Current Communications has a joint venture with Cinergy and they have deployed BPL in Cincinnati for more than a year now with no reports of interference. I've read they also are testing in San Diego and several other areas.Cinergy was recently bought by Duke Power (assuming the regulators approve) so I would expect they will eventually deploy the Cinergy/Current BPL system in the areas they serve.
From the list of investors who've bought into Current, it looks like they've convinced some heavy hitters that they have a winner.