On the Model S Top 5 questions page:http://www.teslamotors.com/goelectric#electricity
The page is using the 2009 EIA numbers, when you could use the 2012 numbers. Here is a link to get the latest numbers for the whole country:http://www.eia.gov/electricity/data/browser/#/topic/0?agg=2,0,1&fuel=vvg... And for the states they have individually broken out:http://www.eia.gov/electricity/data/browser/#/topic/0?agg=2,0,1&fuel=vvg... Electricity generation is significantly cleaner in 2012 than in 2009 For example: Oregon: hydro is up to 65% from 58%, coal is down to 4% from 9%, natural gas is down to 19% from 28% while other renewables are up to 11% from 6%.