Economy 7 can suit storage heating or scheduled loads, but the day rate may be higher and off-peak hours vary by supplier and meter.
Confirm the actual clock and seasonal time changes rather than assuming midnight-to-7am.
Night window
Read it from the supplier and meter documentation.
Profile
Use annual day/night readings to calculate the true share.
Storage heating
Charging controls and heat retention strongly affect results.
Comparison
Include both standing charge and the higher day-rate risk.
Frequently asked questions
Is Economy 7 always seven hours at the same time?
It provides an off-peak period, but exact times and clock behaviour vary; check your setup.
How current are the figures?
Each page shows its review date. Your live tariff and the latest official publication always take priority.
Sources and review date
Content reviewed on: 2026-08-03.
- Ofgem – switch energy supplier — tariff comparison