Octopus Agile negative prices
Know the moment electricity costs less than nothing, so you can run the big stuff then.
I'm on Octopus Agile, region [your region letter, or just my postcode: ____]. Every afternoon when tomorrow's prices come out, check for any half-hours below 0p/kWh. Text me when negative pricing starts and when it stops, with the lowest price. Stay quiet on days with none. Start every message with 'Octopus Agile negative prices:' on its own line.