Octopus do a tariff called Agile, it's like ours whereby it tracks the wholesale rate but the price changes half hourly.
Sometimes the price goes into negative as you can see. Tomorrow its ridiculously negative and between half 1.and half 3 in the afternoon people will be PAID over 7p for every unit they use.
Read stories about people a fortnight ago with a load of oil radiators on in the back garden 😂
On a normal day though it can be quite pricey in the evening (it can go over the cap quite regularly) so unless you can load shift it's not ideal. Quite frankly the price changing every 30 mins would drive me nuts. Be great for shift workers though.
Our daily rate is worked out from the average of the hourly rate, hence why it's just under 8p all day tomorrow. On the Agile tomorrow it goes above 20p in the evening.