Andrew wrote:
As more and more coal and nuclear plants close, the availability of
'unwanted' off peak power diminishes.

Indeed, which is why storage heaters aren't an obvious win in the current
situation, and not necessarily a great plan for the future.

I suspect the only suitable replacement in future will the
OctopusAgile tarriff that gives you advance notice of what your
hourly rate will be so you can plan your usage.

One of the Tims seems to have this tarriff. I would be interested
to know what sort of hourly rate he was paying through the recent
cold snap. The Octopus website only gives historical data up to
about 6 months ago.

https://www.energy-stats.uk/octopus-agile/
gives 18 months worth of data.

It appears the last couple of weeks have been hitting the 35p/unit price
cap for several hours in the morning, as well as the evening peak. It's
been about 12p during the night.

Theo