Where did you here this from? Unless something changed in the last few weeks or so, thats not true. I'm into all this and haven't heard anything about it.
Now say you consume 10,000KWH a year and produce 11,000KWH a year via solar or wind, you will get a credit. But if your system produces a heck of alot more like say 20,000KWH a year they will put a stop to that unless your a RE farm of sorts and have a contract to sell it back.