Compare and switch energy providers regularly

You can use the Citizens Advice price comparison tool to compare prices from different energy suppliers.
 

This will let you get the best energy efficient deal and might also save you a bit of cash.   

At the end of a fixed-term, it’s a good idea to check which tariffs and suppliers can offer you a better deal.  If you don’t do anything, your current supplier might move you to their ‘standard tariff’ - this is usually more expensive than other available tariffs.