Skip to: Content
Skip to: Site Navigation
Skip to: Search


In Gear

Will electric cars kill utility grids? No, study says.

One popular criticism of electric cars is that they will cause problems for our electrical grids. But electric cars are unlikely to trouble electric grids, even as far more of them hit the roads.

By Antony IngramGuest blogger / January 21, 2014

A Nissan Leaf tops off it's battery in Central Point, Ore., at one of the charging stations along Interstate 5. If you didn’t take advantage of a wide array of tax credits and deductions last year, it looks like you’ll be out of luck in 2014. Tax credits for certain electric cars though continue into 2014.

Jeff Barnard/AP/File

Enlarge

One of the popular criticisms of electric cars is that, as more of them roam our roads and are charged in garages at night, electrical grids will struggle and fail under the pressure.

Skip to next paragraph

The website focuses on the auto industry’s future, the evolution of cars beyond fossil fuels, and the green movement's relevance to car shoppers today. For more stories on green cars, click here.

Recent posts

Related stories

It's popular because it seems plausible--while we're all used to having electrical goods in our houses, few use quite so much power for quite so long as a charging electric car.

As is often the case, it turns out to be a misconception--electric cars are unlikely to trouble electric grids, even as far more of them hit the roads.

RECOMMENDED: Car logos quiz

Navigant Research suggests that part of the misconception comes from misunderstanding just how little energy electric cars use--and therefore require when charging.

According to the Energy Information Administration's Residential Energy Consumption Survey, the average U.S. household consumed 11,321 kilowatt-hours (kWh) of electricity in 2009.

Using average fuel consumption of 24 mpg, a gasoline vehicle doing 12,000 miles a year is even more energy-intensive--consuming the equivalent of 16,000 kWh.

If electric vehicles were that inefficient, they'd more than double a home's energy requirements. Doing that with every household in the country--or even a fraction of the homes--would result in a massive spike in demand. Bad news for the grid.

Luckily, plug-in cars are vastly more efficient when it comes to using energy.

Over the same 12,000 miles, the typical battery electric vehicle adds just a third to home electricity demand, and the average plug-in hybrid about 37 percent. Utilities are only collecting an extra $450 to $520 a year from BEV and plug-in hybrid owners, at the average residential rate of 12 cents per kWh.

Navigant says only small changes to the grid would be required--and much of the grid has already been upgraded to cope with demand from air conditioning units during the summer.

Since feedback from plug-in charging has shown the cars are rarely charged at peak times, the increase in grid load is modest.

Real-world data from utilities has already shown that existing levels of electric cars have made virtually no impact on local grids. Last year, PG&E in California said it hadupgraded only 12 neighborhood grids out of 10,000 service checks.

The CEO of a Texas utility also dismissed any concerns back in 2012. Even given the influx of extra plug-in cars since then, it seems the utilities themselves are unconcerned.

Navigant even suggests that electric vehicles will be beneficial for utilities. They won't have to spend much upgrading the grid: local distribution transformer updates, at the most. Renewables integration helps balance load on the grid, too. And ultimately, many utilities will make a little extra money from electric car owners charging their cars each night.

Which rather begs the question: Why does everyone think electric cars will kill power grids?...

RECOMMENDED: Car logos quiz

The Christian Science Monitor has assembled a diverse group of the best auto bloggers out there. Our guest bloggers are not employed or directed by the Monitor and the views expressed are the bloggers' own, as is responsibility for the content of their blogs. To contact us about a blogger, click here. To add or view a comment on a guest blog, please go to the blogger's own site by clicking on the link in the blog description box above.

Related stories

  • Weekly review of global news and ideas
  • Balanced, insightful and trustworthy
  • Subscribe in print or digital

Special Offer

 

Doing Good

 

What happens when ordinary people decide to pay it forward? Extraordinary change...

Danny Bent poses at the starting line of the Boston Marathon in Hopkinton, Mass.

After the Boston Marathon bombings, Danny Bent took on a cross-country challenge

The athlete-adventurer co-founded a relay run called One Run for Boston that started in Los Angeles and ended at the marathon finish line to raise funds for victims.

 
 
Become a fan! Follow us! Google+ YouTube See our feeds!