If you’re looking for alternative suppliers based on price alone, it’s not worth doing. The fact that fixed rate deals currently don’t exist means that basically everyone is charging the same at the moment. That’s unlikely to change anytime soon either.

The chances of you getting a better deal elsewhere right now are basically zero. To be brutally honest, your best option is just staying with OVO for the time being.

Wow that’s depressing but thanks for responding.

If you have a smart meter that reports every half hour the data you want does exist. The problem is how to get hold of it in a form that you can use and I don't think there's a way to get old data. So I'm not sure there's a way to do what you want.

As for alternative tariffs, there are companies offering tariffs with cheap periods. I would have a look at what Octopus can offer.

Thanks for replying. I don’t have a Smart meter. I am looking at alternative suppliers but they invariably ask for the breakdown of night and day usage - hence my question. 

At the account website, you should be able to see meter readings for the last 400 days or so. So, to compare peak and off-peak usage over the past year, note the latest readings for  and , then scroll down a lot to find the ones from a year ago. The difference between the  readings will give you the year’s off-peak usage, and similarly for the  readings. Add the two differences together to get the year’s total usage. Like this, perhaps:
  

For Economy 7 to be worthwhile, you’ll probably find that the off-peak percentage (here 45) has to be at least 40% of the total.

PS. If you don’t see meter readings online, you really only need two bills - the latest and one from, say, a year ago. You’ll find the actual meter readings on the bill, and that’s what counts:
  

Thanks so much for these details. I’ll take a look.