However, this is something to discuss when you ring a prospective retailer. Remember, your new retailer will want to keep you as a customer and so will endeavour to offer competitive prices. Everything can stay just as it is. There should be no interruption to power supply. Your electricity retailer will read your meter and send you the bill.
Meters provide information so retailers know how much electricity is used.
They use this information to prepare your electricity bill. Line companies like Orion do not need meters to provide the electricity delivery service. Most meters are now owned by electricity retailers. If you have questions which relate to the service supplied by your existing retailer, then contact them. If you are considering changing retailer, then ring other retailers and talk about your requirements and what they can offer.