When you move in, contact the existing electricity and gas suppliers, give them your moving-in date and meter readings, and open accounts in your name; you can usually switch to a different tariff after checking your options. If the property has a prepayment meter, ask the supplier how to top it up and whether it can be changed, as eligibility and costs depend on your circumstances. Help with bills may be available through schemes or benefits, but rules vary by income, residence and household situation. Check the latest guidance on GOV.UK and speak to your local council or an advice charity such as Citizens Advice.