The Earth Hour site doesn’t go very far to tell this because they stress the act as symbolic and advocacy, but a couple other sources tell various tidbits. One site says Toronto saved over 2 million kilowatts-hour while another site says northern Illinois saved 100,000 kilowatts-hour. For comparison the world supposedly used 14 billion kilowatt-hours per year, so you can see it’s not going to avert global warming or anything, but it is something.
I saw this issue of power plant shutting down in another question, and I brought to their attention that according to that second source, the area’s electric consumption only decreased by 1% – so I’d need to see some proof or official declaration that any power plants were shutting down before I take that as more than a joke.
You know, Joel, people on both sides of the question gave answers to that and each one was different. I don’t know which story to believe and I seriously doubt anything said by a republican or democrat because they will always slant their answers to look better for their side. I personally don’t think it made much difference at all since not everyone took part.