If you have a smart meter, yes. My electricity rate today is 15p/kWh.

No, they are going up in the new year.

As per other comments, I will likely net profit today from maxing out usage during negative pricing via octopus agile.

Its already pretty cheap right?

Checking Octopus it seems to be averaging about £140 a month on my account.

That’s menaingless without saying what your consumption is