To connect electricity and gas at a new address, you open an account with a retailer, and that retailer asks your local network business to switch the supply on. You never deal with the network business yourself.
Two things decide how smoothly this runs. The first is the meter situation at the property. The second is how much notice your retailer gets before move-in day.
Most utilities connections at an existing home are purely administrative. Nobody digs up the street. Your retailer lodges the request, the network confirms the electricity supply is live, and billing starts from the date you nominate.
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