will you lose power when switching?

No. When you change suppliers, you are only changing the company that sells or "retails" the electricity and gas to your house and sends you the bills. There is no change to the actual source of electricity or gas. Your supplier effectively buys electricity and gas from companies called wholesalers or generators and the energy is sent to your house via the distributors. Distributors are responsible for your energy supply as well as the maintenance of your electricity wires and gas pipes regardless of which supplier you choose to buy your electricity or gas from.

moving house - disconnections & reconnections

In certain States, when you move into a new home your electricity might have to be physically disconnected and then reconnected by the distributor by replacing the fuse. This means there might be a period during which you will have no power.

You can choose a supplier for your new home using the Switchwise service. You must give us at least four business days notice and tell us your exact move in date so that we can ensure that your chosen supplier will arrange for the power to be reconnected at your new address when you move in. You must also ensure that you switch off the electricity at the mains on the day you are advised your distributor will visit. If you forget to do so, the distributor will not be able to replace the fuse and your power will remain disconnected until you can arrange another visit.