Quote:
Originally Posted by Ernie Rogers
There has been a lot of talk about efficiency of production for gasoline and electricity. I thought it might be nice to add some numbers to the discussion.
The numbers I am listing are the percent efficiency, energy in the "fuel" divided by the total energy to produce it, from Greet 1.7 (2005). There may be later values, but I doubt they are much different. ANL gives two sets of numbers, for California, and average for the whole U.S.
WELL-TO-PUMP OR MINE TO PLUG EFFICIENCY
.........................Calif........U.S.
Electricity...........45.9%.....38.1%
Gasoline (RFG).....80.7........80.8
Diesel #2............82.8........82.6
I can look up efficiency for other fuels if people are interested
Ernie Rogers
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At least ANL acknowledges the right form of the problem. Yet they still support the idea of calculating MPGe from the plug to wheels for electric operation.
But if we can ignore that, it looks like even these numbers for electricity production efficiency are simple averages for Calif and U.S. and it looks likely that they ignore the marginal response to incremental loads which is the appropriate way to think.
Is there a detailed reference on these? I will try searching greet 1.7.