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Published: Wednesday 25 September, 2013

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Dont Miss:Readers Choice 2013June happeningsmySpy: Texas ComiconDream Home: Beauty exudes old world charm90s Pop StarsComics GamesBut do electric vehicles, especially in Texas where much electricity is generated with coal, simply move emissions from the tailpipe to the smokestack?

The electricity grid is a mix of generation technologies, some dirty and some clean. With electricity generation that tends toward dirtier feedstocks like coal, you get fewer emissions benefits from electric vehicles, said , senior analyst at the .

About 37 percent of Texas power comes from coal, according to July 2010 data from the , the states grid operator.

But even charged with power from dirtier sources, electric cars are cleaner than todays average vehicle and on par with the cleanest hybrids, Tonachel said.

Hybrids use a combination of electric and gasoline power.

Those pushing electric cars in Texas argue the vehicles offer an effective longterm tool for cutting auto pollution and potentially helping big cities such as San Antonio meet federal clean air standards.

But thats assuming that drivers will charge their cars overnight, when wind power generation peaks. That could decrease pollution.

Last week, power generator NRG Energy announced plans to develop a network of electric vehicle charging stations in Houston and Dallas and later in cooperation with cityowned utilities in Austin and San Antonio.

, NRG vice president, told state lawmakers earlier this year that electric cars exchange daytime tailpipe emissions in densely populated areas for nighttime generation emissions in less populated areas.

That depends, though, on when consumers charge their ca michael kors designer purses rs. During the day, plants fueled by coal or natural gas are more likely to be feeding the grid.

But Stancil was optimistic in his assessment.

Even in the worstcase scenario where 100 percent of that generation is from coal, there is still a net positive emissions tradeoff, Stancil said. A 2007 study found that a plugin hybrid electric vehicle charged with electricity from a coal plant would result in 25 percent less carbon dioxide emissions than a conventional gasoline vehicle, he said.

The study was conducted by , a trade group of which NRG is a member.

A study by , foun michael kors designer purses ding director of the s , found similar results.

Over a lifetime from production to transportation, disposal and the energy used to power various cars the electric and hybrid electric vehicles emitted fewer pollutants than conventional internal combustion engines. Kreiders study looked at the carbon dioxide, sulfur oxide, nitrogen oxide and mercury levels that would be emitted.

Cars running on natural gas, however, fared the best.

A Prius hybrid is a lot better than a conventional car if we just focus on greenhouse gases, but then the question is, Whats the best you can do? Kreider said. michael kors designer purses

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