Economy 7

You don't. They are set by a combination of region and supplier. It's seven hours of lower cost electricity usually starting from either 11pm or midnight. Your electricity bill should show the times for peak and off-peak and the rates for each.

https://www.energyplus.co.uk/tariffs/economy-7

Peter 

Just to mention though…

If you think the meter isn’t switching at the times it’s supposed to then that is definitely in-scope for a closer look. Please bear in mind there is a random offset/delay of up to 30 minutes to avoid the national grid blowing up but if you’re seeing things happen massively outside of those times and it’s not because of GMT/BST differences, your supplier can help.

Suppliers can force the meter to refresh the times to match what they’re supposed to be, though they’re only allowed to refresh them to what is allowed for your area.

If you’re with OVO, get in touch with the Support Team later this week (please avoid this Tuesday!) and they’ll take a look - otherwise please ask the customer service of your supplier.

Hey ​@Brian Irwin,

Welcome to the community! 

I see that ​@Peter E has done a fantastic job answering your question and letting you know that the times are pre-set and can't be adjusted. I’d love to understand why you’re asking about setting the times. Are you looking to change them, or have they stopped working for you and you want to set them up again? I've included a link below with more info on how to find your times based on your MPAN number. Hope this helps!