This may be a useful approach, but at this point I put it in the "Sounds Too Good to Be True" category.  I am not clear how much CO2 is used to frack a well, but I suspect that it is in the thousands of tons range.  In addition, capturing CO2 from a coal-fired power plant to use for fracking natural gas is a much more expensive proposition than is indicated here, at least compared to the cost of pumping water for free from a stream.  A coal-fired power plant produces millions of tons of CO2 per year, so while getting that much to a wellhead may not be cheap, it is still just a fraction of what is produced.  Carbon sequestration sites need very extensive infrastructure, and it seems unlikely that a company would develop that just for a few gas wells, at least not without some powerful financial incentives or legal mandates.

Jim Kotcon