TerraPass funds clean energy from sources like wind farms, methane capture facilities, and more.It could be argued that those measures are just a further subsidy to already artificially cheap electricity. You are essentially giving money to help establish alternative energy industries. One day economies of scale might make those industries cost competitive with coal. The problem is, when that happens, coal gets cheaper, energy in general gets cheaper, demand goes up, and there goes your offset.
I've had a TerraPass for 2 years now and I like it. They seem very professional and they don't sell my personal information to other organizations. That's my opinion.
As for the math you asked about in the second half of your question, I do not know, but a quick Google search brought up this article from an environmental economics blog, and I'm sure there's plenty more research you could do on your own if you were so motivated.
posted by matildaben at 3:01 PM on November 16, 2006