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Octopus has various electricity sale tariffs.
They still have a fixed export tariff which is quite generous at 15p /kWh sold.Also they have various smart tariffs which have a dynamic buy sell price, which can work out really well if you have a lot of battery storage.
Because of the 15p/kWh sale, it worked out cheaper to pay for gas and sell the spare electricity instead. Not the most environmentally friendly option, but better financially.
I thought this was not a thing? i.e. it was at 1 point but they stopped it?