I think I know the episode you're talking about, although the name escapes me at the moment. Actually, I think I've seen two or three different shows mention it in 2006, but are you talking about the show that is part fictional and that includes a bit where some satellite crashes into some New York park, and the only way to protect NYC's power grid is to completely shut down everything in Queens or Brooklyn to save that part of the power system from the coming solar storm?

I may have recorded it somewhere to watch later. I might still have it.