Sure You can base it on the wholesale price, great if you have battery storage https://octopus.energy/smart/agile/ https://octopus.energy/smart/agile/ Or jus

Sure You can base it on the wholesale price, great if you have battery storage https://octopus.energy/smart/agile/ https://octopus.energy/smart/agile/ Or just an overnight rate https://octopus.energy/smart/intelligent-octopus-go/ https://octopus.energy/smart/intelligent-octopus-go/ Again if you put in a £5k 10kWh battery you are golden, as you put 8kWh into your car and 8kWh into your battery every night, dropping your electric cost to £38 a month (plus the standing charge, which is far higher)