Find out who supplies the property
Your solicitor or estate agent may be able to tell you. If not, you can find the electricity supplier by contacting your regional electricity distributor or using the 'Find My Supplier' tool. For gas, call the Meter Point Reference Service on 0870 608 1524. Your meter point reference numbers (MPAN for electricity, MPRN for gas) are on the meters themselves and help identify your supply.
Contact the supplier and give readings
Call or go online with the existing supplier as soon as you move in. Give them your opening meter readings and your name. They'll set up an account for you on their default tariff. This is usually not the cheapest deal, so treat it as temporary while you shop around.
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You're free to switch supplier from day one. Use a comparison site like Ofgem's accredited services to find the best tariff. A switch typically takes 2–3 weeks. Consider whether you want a fixed or variable tariff, and whether you'd benefit from a dual fuel deal (gas and electricity from the same supplier). Many suppliers also offer moving-home tariffs. Don't forget to also notify your water company and compare broadband deals at your new address.
What about prepayment meters?
If the property has prepayment meters and you'd prefer a credit meter, you can ask your supplier to switch it. There may be a fee, or it may be free — it depends on the supplier and meter type. Smart prepayment meters can often be switched remotely at no cost.