On Wed, Apr 10, 2013 at 09:40:38PM +0000, Lux, Jim (337C) wrote:
> In the US, electricity comes mostly from coal and natural gas, with the 
> latter rapidly replacing the former.  France is somewhat unusual in having 
> significant nuclear generation, but in the US, nuclear has been roughly 
> constant at about 20%.

It doesn't have to be nuclear, coal or gas
http://www.renewableenergyworld.com/rea/news/article/2012/10/german-coal-fired-generation-of-electricity-falls-while-renewable-generation-rises
 
> 
> In PetaWattHr
> Coal  1.517
> Gas   1.231    (natural)
> Nuc   0.769
> Hydro 0.277
> Renew 0.219   (wind, tidal, solar)
> Oil   0.013
> Other 0.012   (no idea what this is, biomass?)
> Gas   0.011   (other, blast furnace gas, e.g.)
> Coke  0.010    (from oil)
> 
> Over the last few years, Coal is decreasing by about 200 TeraWh/yr, Nat gas 
> increasing by about the same. Oil is decreasing by about 3-4 TWh/yr, 
> renewable is increasing about 20-25 TWh/yr.
> 
> http://www.eia.gov/electricity/monthly/epm_table_grapher.cfm?t=epmt_1_1
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