- Ofgem: “The number following Economy refers to the number of hours for which night-time rates are available.”1
- “If you’re on Economy 7 you’ll usually get 7 hours of the off-peak rate per 24 hours.” “If you’re on Economy 10 you’ll usually get 10 hours of the off-peak rate per 24 hours.”2
- On a default tariff, peak and off-peak rates are capped together: Ofgem says “Together, they cannot be more than the price cap.”3
- Last checked: 28 October 2026.
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When the cheaper hours are
Citizens Advice says Economy 7 is usually one overnight block, for example 11pm to 6am. Economy 10 hours might be split into chunks through the day. Your supplier sets your exact times, so check your bill or ask.2
Do you have a two-rate meter?
“You can usually get an Economy 7 or Economy 10 tariff if you have a two rate meter or a smart meter.”2
A two-rate meter has 2 rows of numbers. Citizens Advice: “If there’s an ‘N’ on the label this will stand for ‘normal’ - it doesn’t stand for ‘night’.”4
Working out your cost
Ofgem publishes no single night rate for the cap: its regional tables are for single-rate tariffs. Use the day and night rates on your bill.3
Ofgem describes a multi-rate tariff as one where you pay one rate during a specified off-peak period “and another, more expensive rate during peak hours”, so the cost depends on when you use electricity.5