[blitzar]

To incentivise car owners to plug in, participants in the Octopus trial are being paid a generous sum of 15p per kilowatt hour for the electricity they send to the grid

On the 11th February 2022, the current Octopus Energy fixed 12-month tariff is 37.29p per kWh for electricity

"generous sum" indeed - they get to sell you electricity at 37.29p to fill up your battery, buy it back for 15p and sell to you again an hour or so later for 37.29p - repeat and rinse overnight and you have infinity pence.

[Symbiote]

The Octopus EV tariff charges 7.5p/kWh at night

[blitzar]

Good point well made - my mistake.

Rinse and repeat all day instead of all night!