Can I save with Economy 7 or Economy 10?
Economy 7 and 10 tariffs are designed to give you a cheaper electricity rate at night and a more expensive rate during the day. There aren't any gas tariffs. Used properly, they could save you money. But whether you’ll benefit or not depends on your energy use habits. They are primarily designed for people who have storage heaters.
If you change your energy habits or your heating system without changing your tariff you could find yourself overpaying as peak daytime rates can be expensive.