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Too Many Electric Cars Charging at Night May Overload Electrical Grid

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The computer models showed that having more drivers charging during the day could reduce the grid’s energy storage requirements by between $700 million and $1.5 billion.

Credit: Dinendra Haria/SOPA Images/Shutterstock

Computer modeling by researchers at Stanford University determined that the western U.S. power grid should invest in daytime charging options for electric vehicles (EVs) because primarily charging EVs at home overnight could put a strain on the power grid.

The researchers developed computer models that calculate the impact of driver charging behaviors and available charging station infrastructure at home and in public places on peak net electricity.

The models showed a 25% increase in peak net electricity demand when states hit 50% EV ownership and drivers mainly charge their vehicles at home overnight.

However, the increase in peak net electricity demand dropped to 7.5% by increasing daytime charging options.

The researchers also found that an increase in daytime charging could result in a $700-million to $1.5-billion reduction in the grid's energy storage requirements.

From New Scientist
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