State-owned distributor Horizon Power says a trial using bi-directional charging with electric vehicles to supplement the grid and take up excess power has proved a success.

The 12-month trial was conducted in Exmouth, a town of nearly 3,000 people in Western Australia's north-west, and involved testing Horizon's Distributed Energy Resource Management System (DERMS) in real-world conditions.

It makes use of a vehicle's large battery to both power the car and power the supply grid when parked, known as vehicle-to-grid services, or V2G.

Ray Achemedei, executive general of manager technology and digital transformation at Horizon Power, explained the trial to Nadia Mitsopoulos on ABC Radio Perth.

"Basically what we did is we got a fleet of Nissan Leafs and we allocated those Leafs to some

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