From around 10 am to midnight my use is near to zero at the moment, I rely on off-peak however for the bad days. The export at 12p/kWh I get at the moment is the make and break point. And the main thing is how ones inverter can be programmed.
So at 8.21p/kWh off-peak, and 12p/kWh export I can set to charge batteries to full, and even if no space in batteries during the day for solar, I am still gaining.
OK if batteries run out 30.74p/kWh until 00:30, but I would hope this time of year they will not run out very often.
So last month bill was just under £6, this month already spend around the same, so looking at 2025 no details for before April but £64.48 for April onwards is not too bad. This year can't get software to show price, in kWh it is -951,075 kWh.
Jan to April this year cost £114.37 so Annually the bill around £180. It will be more now as export dropped from 15p to 12p but to my mind the 19:30 to 22:30 at 15p/kWh would be an advantage, but the 03:00 to 06:00 is too late most days, and if export is less the 15p/kWh one would need to be very careful not to charge up the batteries too much.
So if no batteries or solar, it would require a lot of careful use, and I would say it would be very good for heat pump users.
With solar only, one is in the lap of the gods, as you can't predict when you will get solar.
With solar and batteries, it will depend on battery size, if we still had 3.2 kWh battery it may have helped us, but with 6.4 kWh it is unlikely to help.