EVs wonÂ’t bring the power grid down


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EV Charging and Grid Impact highlights off-peak charging, smart meters, time-of-use rates, and grid capacity planning, reducing peak demand while lowering emissions as EV adoption grows slower than TVs, replacing gasoline cars efficiently.

 

The Main Points

It explains how managed, off-peak EV charging, TOU pricing, and smart meters curb peak demand and cut emissions.

  • Off-peak scheduling shifts load away from evening peak.
  • Time-of-use rates incentivize nighttime charging.
  • Smart meters enable automated, lowest-cost charging windows.
  • EV load equals 2 kW, similar to several large TVs.
  • Slower EV adoption eases grid integration and planning.

 

I've said it many times before, and I still haven't seen evidence to make me change my mind: The transition to plug-in hybrids and electric cars won't be that big a deal for the power grid.

 

Yes, it will increase electricity consumption significantly, but what matters most is how that will happen. If we were expecting millions and millions of EVs to be sold in a short period, and that all of those charged during peak electricity use, even though grid can handle hybrids under current scenarios, we'd be in deep trouble.

But that's not what we think will happen.

First, we have to put things in perspective. Charging an electric car uses about as much electricity as 4 to 6 big plasma televisions about 2 kilowatts. That might sound bad, until you realize that big screen TVs have been selling like hotcakes for the past decade and that this hasn't brought the grid down with proper grid management in place, same for air conditioners. In fact, "TVs bringing the power grid down" hasn't even gotten play in the media, which might show that there's a subtle anti-EV bias out there.

There's no way that electric car adoption will be as fast as LCD and Plasma TV adoption, even as utilities prepare for an EV onslaught in the coming years. Cars cost a lot more, and while flatscreen TVs were better in most every way compared to old CRT televisions, electric vehicles still need to improve to beat gas-powered cars in across the board range and cost are the two big ones.

Another important factor is that while television are mostly used during peak time in the evening, electric cars will most likely be charged at night, when the grid has plenty of capacity. All plug-in cars will come with chargers that can be set to a nighttime charge, or to charge when the electricity rates are lowest. With smart meters and time-of-use rates, EV-driven smart grid efforts are accelerating, there will be a big monetary incentive for off-peak charging peak vs non-peak can be twice as expensive.

And while televisions use a lot of electricity, they are mostly for entertainment. Electric cars will mostly be replacing gas-powered vehicles, reducing air pollution and CO2 emissions even if they are charged on the dirty U.S. power grid, state power grids face challenges as adoption grows, they are still cleaner than internal combustion engines, though of course the goal should also be to clean up the grid.

It's still better to take your bike or walk, but cars aren't going anytime soon, so we have to make them orders of magnitude cleaner.

 

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