Saturday, July 7, 2012

Promoted Comment: The Biggest Lie About Electric Cars

Sources conflict on the number of pounds of coal to create a kWh of electricity:
* Dept. of Energy: 2.1 lbs.
* Arizona Public Service Company: 1.1 lbs.
* CoalEducation.org: 0.8 lbs. (big surprise that the coal industry claims the greatest efficiency)
Transmission and distribution losses are estimated to be 7.2%, so our adjusted figures would be 2.25, 1.18, and 0.86 lbs. per kWh respectively.
An average household uses around 920 kWh/mo. If they got all their electricity from burning coal, that’s 2070 to 791 pounds of coal per month.
(Incidentally, coal-fired plants are only 37-44% efficient at converting coal to electricity.)
The MINI-E has a 35 kWh battery pack but only 80% of the pack is usable which means it has 28kWh of available power. That 28kWh can move the car between 90 and 120 miles depending on how efficiently you drive. It is less in the winter months because the heater uses a lot of energy, but for most of the year these numbers are correct as an average.
Therefore: it takes up to 63 POUNDS of coal to go 90 miles!
hmmmmmmmm… I wonder what pollutes more…burning 63 lbs of coal or 3 gallons of gas?… hmmmmm…

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