SHIFT Sorry critics & electric cars really are greener DVICE

22 Фев 2014 | Author: | Комментарии к записи SHIFT Sorry critics & electric cars really are greener DVICE отключены
Nissan's Greener Electric Cars

SHIFT: Sorry, critics cars really are greener

I got the to drive the 2010 Tesla Sport earlier this Sitting behind the wheel, the power of the all-electric motor, it was not to get caught up in the potential of electric (EVs). Why aren’t all vehicles I thought. If we can build sporty, electric cars like the surely we can make any car electric.

we can make every car electric!

Slow down there, me. Isn’t that sleek EV driving just trading for other fossil fuels, our very coal-heavy power At least one person, Rutgers professor Sunil Somalwar, is the tradeoff isn’t worth it, and he a convincing case here .

I don’t agree with though. Why? Simple

Electric Vehicles’ Power

If every car in America went it would mean all their would come directly the power grid (let’s those solar-panel-roof and wind-turbine are merely incidental). Just a little back-of-the-envelope math: A Roadster battery stores 53 (kWh) of energy. The Roadster’s a really a typical EV battery, and a better amount would be about half that 25 kWh.

Now multiply that by the number of on U.S. roads (about 250 according to the Department of Transportation ) and you about 6 billion kWh stored in all theoretical batteries.


How often do batteries need to be recharged? our 25kWh battery, and with EVs getting about 2-3 miles per let’s be conservative and say each one need two full charges a So that’s about 100 charges of the per year.

So all those electric vehicles use about 600 billion kWh a year.

The U.S. power grid a little over 4 trillion kWh in according the Energy Information (EIA). A 600 billion kWh increase be significant, but not unimaginable.

The Power Dilemma

Nissan's Greener Electric Cars

Nonetheless, 250 million EVs on the would mean the country need a lot of new power plants. the majority of our power coming coal, is that really a idea? Sure, we could assume we’ll build a of pollution-free solar, wind or plants, but let’s assume the and all that extra energy from coal. Per the EIA. kWh generated by a coal plant two pounds of carbon dioxide.

So 600 billion kWh x 2 lbs of CO 2 /kWh = 1.2 trillion of CO 2 . Ouch.

Still, is that than gasoline? The EIA says the consumed 3.3 billion barrels of in 2008. or 138 billion gallons. The Protection Agency says one of gas belches out 20 pounds of CO 2 . That up to about 3 trillion pounds of CO 2 .

The Inevitable Conclusion

So if every car in the switched to electric, and every watt of power for those came from a power that’s coal-fired, we’re coming out ahead in the greenhouse-emissions

Sure, EVs won’t work for all Just highway travel poses a big problem. But the argument you’re just trading fuels simply doesn’t water.

And that Chevy is starting to look mighty

Nissan's Greener Electric Cars
Nissan's Greener Electric Cars

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