Contact your energy supplier as soon as possible, as it may be able to review your payment arrangement, check for support schemes or agree a manageable way to repay debt. If you cannot top up, check your meter’s emergency credit and use the supplier’s emergency helpline; the terms vary by supplier and meter. Ask about joining the Priority Services Register, and contact your local council to see whether fuel vouchers or other cost-of-living support is available. You can also check the latest guidance on GOV.UK and Ofgem.