What is Economy 7? And how can I change to this energy tariff?

Economy 7 electricity tariffs charge less for energy used during the night (per unit) than energy used during the day. 

This is good for those who use night storage heaters or can run washing machines or dishwashers on timer overnight. We estimate you need to use roughly 55% of your total electricity use between approximately 1am and 8am, depending on the supplier, to make a saving. However, this can vary widely depending on your tariff, region and usage.

Contact your current energy supplier if you are interested in switching to Economy 7. You'll need a different meter installed (some energy suppliers charge for this). Once you have changed your meter you'll be able to switch energy suppliers, so come back to Which? Switch to look for the best deal.

Other energy tariffs to consider include Economy 10 which provides discounted prices for the electricity used during ten off peak hours per day. These rates are available during the daytime as well as the evening.