This is probably one of those gorilla operations:
http://www.power4home.com/index.php?hop=taa200"Inventor From Minnesota Swears Under Oath He's Not Cheating The Electric Companies — He's Simply Generating His Own Power At Will!"
Though the POCO may wonder when you produce more power than you consume over the month. Or they may assume you burned enough power to make the meter almost do a complete turn over (like when your car's odometer rolls over to zero miles).
I don't think that is possible (you'd trip the main breaker). But they'd be worried about their linemens' safety, if your system doesn't shut down during an outage.
