Jon_h wrote:I did the math for Michigan. 40% CO2 savings on our dirty grid.
At first glance that doesn't seem like a full life cycle analysis. Including mining/drilling/refining/transportation etc. emissions and line losses etc. would probably change the numbers but you'd likely get a qualitatively similar result.
UCS's analysis ( http://www.ucsusa.org/sites/default/fil ... ummary.pdf
) would suggest that your calculation is optimistic. OTOH, the grid emissions factors data they used for that report were from 2012, IIRC. Carbon intensity has probably improved since then. Southern Co., the major energy producer in my neck of the woods, has cut its carbon intensity by ~25% over the last decade (most of that between 2007-2012).