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What do power customers who sign up for "green power" from their utilities actually get? In "Grey Ares in Green Power," correspondent Dan Goldstein gets to the bottom of it.

You may have seen advertisements for these special plans in your utility bill, or you may already be a customer. But if you think you're actually getting a direct stream of clean energy electrons delivered to your home, think again - you may not be getting green power at all, despite paying a premium for it up front.

Dan talks to college students in California who though they were buying renewable energy for their school, but found out they were really buying renewable energy certificates, or RECs. He also talks to their professor, who learned that the renewable power those RECs funded wasn't really traceable.

We also visit the owner of an organic market who that advertises 100 percent of its electricity comes from wind power. Find out what he tells his customers when they ask if that's true. And Dan interviews the regulators who run REC programs and are responsible for making sure they money really goes toward generating green power.