Frequently asked questions
Here is a selection of questions we are frequently asked about energy suppliers, energy tariffs and the switching process. 
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Cut your energy bills with Which? Switch
The average saving when switching gas and electricity is £217 - compare gas and electricity tariffs now to find the best deal for you.
This figure is based on the 53,459 households who switched suppliers using Which? Switch and The Big Switch between 1st September 2011 and 31st August 2012.
Preparing to switch FAQs
- What information do I need to switch energy suppliers?
- How can I find out who my current energy supplier is?
- How do I find my electricity (MPAN) number?
- How do I find my gas (MPRN) number?
- Will there be price changes soon? When is the best time to switch?
- What is the best way to make savings?
- What is the most accurate way to enter my current consumption?
Switching eligibility FAQs
- Can I switch if I am about to move house?
- Can I switch if I'm renting a property?
- Are there any reasons why I may not be able to switch?
- I'm a prepayment customer, can I switch?
- Can I switch if I have have a feed-in-tariff or smart meter?
Choosing a new supplier FAQs
- What payment methods are available?
- Can you explain the results page in the Which? Switch calculator?
Switching process FAQs
- How does the switching process work? What do I need to do?
- Will my current energy service be interrupted?
- If I switch supplier, how long do I have to stay with my new supplier for?
- If I have a complaint or something goes wrong in the switching process, who do I contact?
After you've switched FAQs
- What happens if I switch and my new supplier changes its prices?
- What if I change my mind?
- When should I hear from my new energy supplier?
Which? Switch FAQs
- Why switch with Which? Switch and not directly with the supplier?
- Do you work with all the energy suppliers?
- How frequently do you update your website?
- Why are the savings featured on your site different from those on another comparison service?
- How does Which? Switch make money?
- What different energy tariffs are available on this website?
- Why are some tariffs not featured on your site?
- Why do the quoted rates differ from my bills from the same supplier?
- Why can I receive quotes from some suppliers, but not complete the switching process with them on your site?
- Can you explain the results page in the Which? Switch calculator?
- What payment methods are available?
Energy supplier FAQs
- Do you work with all the energy suppliers?
- How can I contact energy companies directly?
- What are the benefits of switching energy supplier?
- How do I complain about an energy supplier?
- Why can I not find a specific energy supplier on your site?
Tariff FAQs
- Are there any energy tariffs featured on Which? Switch for the over 60s?
- Do you include historical energy tariffs in your comparisons?
- How do I find out if I am on an IGT tariff?
- What are IGT energy tariffs?
- What are online only energy tariffs?
- What is a capped tariff?
- What is Economy 7? And how can I change to this energy tariff?
- What is green energy?
- What are the requirements for green energy tariffs?
- What is a fixed energy tariff?
