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Roger Arnold's picture
Director, Silverthorn Institute

Roger Arnold is a former software engineer and systems architect. He studied physics, math, and chemistry at Michigan State University's Honors College. After graduation, he worked in...

  • Member since 2018
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  • Jun 24, 2021

This announcement marks a development I've been expecting for some time now. Integration of a BESS with an EV fast charging station makes so much practical sense that it was inevitable. It decongests power delivery to the charging site when multiple vehicles are charging. It could also be used for demand response. EV owners could charge their vehicles at times when rates were low, and then sell energy back to the grid when rates were high.

Matt Chester's picture
Matt Chester on Jun 24, 2021

It could also be used for demand response. EV owners could charge their vehicles at times when rates were low, and then sell energy back to the grid when rates were high.

This is an interesting thought, Roger-- I hadn't considered public chargers being a cog for this, just in-home chargers, but I suppose if I'm parking my EV somewhere I can simply let the charger know what level of charge is my requirement for me to get home afterwards and not dip below that point? 

Roger Arnold's picture
Roger Arnold on Jun 24, 2021

Leaving the vehicle parked at the charger for an extended period would be a helpful option, but not strictly necessary in order for EV owners to benefit from rate arbitrage. The supply and load patterns and schedules are fairly predictable at least 24 hours in advance. A smartphone app could display a schedule of rates, to allow an owner to choose when and where to charge up. It could also display rates for energy buyback, and take account of the owner's EV model and the state of its batteries to determine when selling power back to the system could return a (small) profit.

I don't expect that rate arbitrage by individual owners visiting fast charge stations will ever become a big deal. It would be more of a game that some EV owners might engage in just for the fun of being able to claim a tangible financial return on their EV or home solar power investment. Bi-directional transfer at a charging station equipped with a BESS would be very easy to support, and would promote sales of EVs and solar panels.

There's actually one class of situation where I can see a fast bi-directional transfer capability being important. If a region is hit by a fire or disaster of some sort that will require an emergency power supply, a public service alert could go out requesting EV owners to drive to a station near the area and deliver whatever energy their vehicles can spare. It strengthens a community when its citizens have opportunities to contribute and feel good about.

Jim Stack's picture
Jim Stack on Jun 26, 2021

Tesla has been doing this at many cites for a few years now.


Tesla has opened a rare new V3 Supercharger station after launching the new generation of its EV charging infrastructure months ago.

It was worth the wait because this new Supercharger station in Las Vegas looks like the electric car charging station of the future with solar and battery power.

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