Charging electric vehicles at night can be dangerous

Carnegie Mellon University’s study, recently published in the journal Environmental Research Letters, poured anxiety on the night charging of electric vehicles.

3/29/16 5:00 am chumakdenis 1

Did you know that EV charging at night can be dangerous?

I bet you didn't -- no one did.

But it turns out, it is.

According to Carnegie Mellon University’s study, recently published in the journal Environmental Research Letters, night charging of electric cars is, let’s say, not the safest thing to do.

Here's why: environment impact of night charging.








Yes, there is a huge negative impact from night charging and this fact has been proved on practice.

5853.jpgJeremy Michalek, a professor of engineering and public policy and mechanical engineering, and his colleagues modeled the PJM region, which includes Washington, D.C., Philadelphia, Pittsburgh, Cincinnati and Chicago, and whether there is something wrong in generating electricity at night instead during the day?

CMU’s study concerns coal-fired power plants suggesting that at least in some cases night charging could indeed cause more harm over daytime than good.

Here's what's written on the official site on that:

“Researchers at Carnegie Mellon University find that while charging electric vehicles at night is more cost-effective, it increases air emissions"

"Charging electric vehicles late at night, when demand is low and electricity is cheapest to generate, is preferred by grid operators. However, CMU researchers found that it produces substantially higher greenhouse gas emissions and air pollution than simply charging as soon as the driver returns home."

Michalek added:

“We looked at how power plant operations would change in response to electric vehicle charging load, and we modeled emissions from those plants and their downwind air pollution consequences for human health and the environment. We found that charging late at night reduces power generation costs by a quarter to a third, largely by shifting to cheaper coal-fired power plants. But the extra emissions released as a result can cause 50 percent higher costs to human health and the environment.”

Well, quite a good reason of him.

I don't know, but personally for me, coal-fired power plants are 'dead' -- I'll never use them again.

They produce sulfur dioxide, which is the extremely dangerous component for our health -- just check out how many problems in coal-heavy regions like the Chicago, Washington, D.C., Philadelphia etc.

These people are much sicker than others.

I don't want to aggravate it.

Plus, charging later at night increases greenhouse gas emissions nearly in all U.S. regions -- sad to notice, but we are tied on the coal energy.

Will it change in the future?

Well, It remains to be seen if it will change -- no one knows how long we'll be using coal-fired power plants-- but associates from Carnegie Mellon University feel quite optimistic about it.

Michalek said the picture could change in the future as many coal-fired power plants are expected to retire in response to recent regulation.

“As coal is phased out and the grid becomes cleaner, the emissions implications of charging at night will be mitigated,” he said, “and the benefits of late-night charging for the electricity grid may be good reasons to delay charging.”

Last week’s Supreme Court decision to halt the Clean Power Plan while it undergoes litigation could delay the shift away from coal, according to Michalek.

“For now, if you live in a coal-heavy region like the Chicago, Washington, D.C., Philadelphia area, delaying charging until late at night can cause more harm than good.”



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