V2g: Two-way Charging May Be The Next Big Thing In Evs

Companies from General Motors to Volvo Cars, alongside utilities and charging app operators, are calculating their financial cut as EVs that allow their owners to sell power back to grids become a more realistic prospect.

Bidirectional, or vehicle-to-grid (V2G), charging lets EV owners charge at overnight off-peak rates then sell power back to grids at a profit during peak hours.

For short periods, a million EVs could provide as much power as a large nuclear power plant, says Nick Woolley, CEO of UK software firm ev.energy , which is working on V2G technology with Siemens, Nissan, Volkswagen and others.

For many years V2G remained largely theoretical, as the Nissan Leaf was the sole EV capable of it. That has begun to change with the help of smart electricity meters, artificial intelligence and modelling by innovative energy companies.

And most major car makers, including Tesla, BMW, Volkswagen, Renault and Toyota, are expected to launch V2G capable models over the coming years. Chinese manufacturers, such as BYD have also developed the technology and, crucially, the Chinese government plans a big role for V2G by 2030.

There is a lot of money to be made, Doron Frenkel, CEO of Driivz, said of balancing grids. Everyone wants their own piece of this. Driivz has access to millions of EVs via the white-label charging software it provides to car makers and others.

In the US, bidirectional charging is experimental, while in Germany regulatory hurdles around how to price any energy sold back into the grid mean it is a distant prospect. Bidirectional chargers are also more expensive than conventional ones because for now they are produced on a smaller scale.

They do not yet know how much they might make. Most of the money will go to EV owners, leaving just pennies per kilowatt for intermediaries selling power to grids, but across millions of EVs, that would add up.

Within the next few months, GM will launch an electric Chevrolet Silverado bakkie capable of powering homes the same technology as V2G and all its EVs will have bidirectional capability by 2026, said Aseem Kapur, GM Energys energy solutions director.

GM plans to both sell energy to utilities and partner with aggregators pooling larger numbers of EVs to sell power, Kapur said. The company is also building partnerships with US utilities, including Duke Energy. GM rival Fords F-150 Lightning bakkie is V2G capable.

Shilpen Patel, 39, has been using his Nissan Leaf for an Octopus Energy V2G pilot scheme in London since 2020, plugging in when at home and cutting his annual household energy bill by £700, or about a third. The savings have been pretty remarkable, Patel said.

As a precursor to V2G at scale, companies including Octopus already operate grid balancing services. To avoid firing up expensive additional capacity, grid operators pay them to power down EV chargers for very short periods.

Denmarks Monta, for instance, gives charging app users in some markets around €8/month for grid balancing, while Driivz uses it to protect the Dutch grid from demand spikes.

Volkswagens energy unit, Elli, is building a trading platform in Germany for grid balancing as a precursor to V2G and plans to expand or work with partners in other markets, said Ingo Mueller, the units head of energy solutions.

Nuvve provides V2G services for around 500 electric buses in a number of US states, an easy proposition as they are plugged in most of the day and during school holidays. But for passenger EVs, persuading customers via apps with accurate and attractive pricing will be vital.

Platforms with reliable AI forecasts for how many EVs will be plugged in will get more business from the likes of Duke Energy, which is running bidirectional tests with GM and Ford. Youve got to be able to accurately predict how much capacity is available at any given time, said Zachary Kuznar, MD for grid solutions development at Duke.

Car makers energy units will mostly lack the scale to aggregate enough EVs locally to sell power to utilities, so emerging platforms, including Kaluza or The Mobility House, aim to act as intermediaries, aggregating EVs across multiple brands.

Those intermediaries will also need to ensure EVs do not overburden grids if everyone charges when prices are low and discharges when they are high, Timo Kern, director of energy systems and markets at Munich-based energy research institute FfE, said.

Renault has partnered with The Mobility House, while Volvo is working both on its own platform and with others like Kaluza, said Alexander Petrofski, who heads Volvo Cars Energy Solutions.

Kaluza is also working with other motoring manufacturers