Melbourne's rules apply. Sunbury is in Hume City, a metropolitan council, and the rules on our Melbourne electricians page apply as written: Energy Safe Victoria registers contractors and expects the REC number on promotional material, every installation job is certified on a Certificate of Electrical Safety, prescribed work such as a switchboard or solar system is inspected before it's turned on, and since 13 October 2026 every Victorian rental needs an electrical safety check every two years.
A busy zone substation. Jemena's planning report from August 2025 puts about 18,875 customers on its Sunbury zone substation, roughly 94 per cent of them households. The substation peaks in summer and is already above the load it can carry with one transformer out of service. Jemena forecast maximum demand of 51.5 MVA for summer 2025, rising to about 67.6 MVA by 2034, driven mainly by new subdivisions in the south-west and north-east of its supply area. Its preferred fix is to upgrade two of the substation's three transformers and run a new 22 kV feeder of about 4.5 km, in service by 2027–28. The same report counts about 5,400 solar systems on the substation, 27 MW between them, on roughly 29 per cent of customer premises. If you service, upgrade or add batteries to existing systems, say so: there are thousands of them within a short drive.
Up the Calder, a different network. Jemena's territory runs as far north-west as Gisborne South and Clarkefield. Beyond that, the lines are mostly Powercor's: in February 2025 it had helicopters inspecting its powerlines over Gisborne, Woodend, Riddells Creek, Kyneton, Romsey and Lancefield. Solar pre-approvals, defect notices and reconnections go to whichever business owns the poles and wires at the address, and their offers differ. Powercor, for example, gives customers whose pre-approval comes back at 0 kW the option of a flexible exports connection, exporting up to the inverter's limit or 10 kW whenever the network has room. A sentence on your solar page saying you deal with both networks covers it.
The growth corridor. The Sunbury South and Lancefield Road precinct structure plans, both gazetted in January 2019, guide the estates growing around the established town, and since 1 January 2024 new Victorian homes that need a planning permit can only connect to all-electric networks. Induction cooktops, heat pump hot water, reverse-cycle systems and EV chargers are therefore standard questions on a new Sunbury house; our Melton electricians page covers chargers and all-electric homes in more depth. We're an Adelaide team, so a Sunbury site comes together by phone and email: you send your REC details, the suburbs and towns you cover and photos of your work, we send back a draft to check on your phone, and you pay once you approve it.