If you are in the UK and have a Leaf with a 30kWh battery or larger, you can participate in a V2G trial: https://www.ovoenergy.com/electric-cars/vehicle-to-grid-char...
https://www.indra.co.uk/v2g
Technically, Leafs with 24kWh batteries work, too, but they aren't normally accepted in the trial as there is not enough capacity to be worthwhile.
If you are in the UK and have a Leaf with a 30kWh battery or larger, you can participate in a V2G trial: https://www.ovoenergy.com/electric-cars/vehicle-to-grid-char...
https://www.indra.co.uk/v2g
Technically, Leafs with 24kWh batteries work, too, but they aren't normally accepted in the trial as there is not enough capacity to be worthwhile.