The energy crisis saw many energy suppliers go out of business. Most of these suppliers also had a large customer base. However, you should be reassured that your supply will not be interrupted should your supplier go bust. The process does work slightly differently for homes and businesses.
Home energy customers are protected by Ofgem should their supplier goes bust. Ofgem will appoint a new supplier to manage your home energy. Any credit you had with your old supplier will be transferred to your new contract.
Business energy works similarly. A new supplier will be appointed, and you will be placed on a deemed contract. However, any credit you have is not protected in the same way. Ofgem will attempt to appoint a supplier that can refund some or all of your credit owed.
If you have a large amount of credit with your old supplier, you may need to contact the administrator. You will need to provide evidence for the money such as a recent energy statement from your old supplier.