Temporary power keeps sites, events, shutdowns and emergency responses running. Sizing a generator starts with a list of loads: continuous kilowatts, motor starting currents, single or three-phase supply and how many hours it must run.
Motors, welders, compressors and pumps draw several times their running current on start-up, so a generator sized only to running load can trip or stall. Suppliers normally size in kVA and allow headroom for starting loads and future additions.
Remote and long-duration hires need a refuelling plan, bunded fuel storage and a service schedule. Lighting towers, cable, distribution boards and RCD protection are often part of the same package.
Power classes and sizes
The table below lists the classes of generators most commonly available for hire in Australia. Exact specifications vary by make and model—confirm dimensions, weight and capacity with the supplier before booking.
| Class | Size / spec | Typical jobs |
|---|---|---|
| Portable generator | 2–8 kVA | Hand tools, small sites, trades |
| Towable generator | 20–150 kVA | Site sheds, pumps, cranes, events |
| Large / containerised | 200–1,000 kVA + | Shutdowns, mines, backup for buildings |
| Lighting tower | 4 × LED · 9 m mast | Night works, roads, security |
| Distribution / cable | Boards, RCDs, leads | Safe temporary power distribution |
How to choose the right machine
List every load
Record the running kW and phase of each item and identify motors with high starting current. Share the list with the supplier.
Plan fuel
Ask about fuel consumption at expected load, tank run time, bunding and who refuels.
Consider noise
Residential, hospital and event sites may need super-silenced sets or specific placement.
Get it connected properly
Connection to fixed installations must be done by a licensed electrician with correct changeover and earthing.
Licences, tickets and compliance
- Temporary electrical installations on construction sites must meet AS/NZS 3012, including RCD protection and regular testing and tagging.
- Connection to a building's switchboard requires a licensed electrician and correct changeover arrangements.
- Fuel storage requires bunding appropriate to volume and environmental conditions.
See our plant licences and tickets guide for the full list of High Risk Work Licence classes.
What drives the cost
The hire rate is only part of the total. On short hires these items often add 20–50% to the bill—ask every supplier to quote them the same way:
- Unit size and run time
- Fuel and refuelling service
- Cabling, boards and electrician connection
- Transport and crane off-load for large sets
- Standby and backup units for critical loads
For indicative 2026 rates, see the plant hire cost guide.