Liddell Battery and NSW’s New Firming Capacity
Liddell and three other supported projects are operating. Their grid role differs from residential backup and bill savings.
Batteries
Liddell Battery concept rendering. Image: AGL.
Liddell’s battery has reached full commercial operation, completing the four projects supported through NSW’s second firming tender. The NSW Government confirmed the milestone on 18 September 2026. The practical purpose is to supply energy or reduce demand when the electricity system needs support, including during summer peaks.
What has been completed?
The NSW Government announcement lists three batteries and a virtual power plant:
- AGL’s Liddell battery: 500 MW of power and 1,000 MWh of storage.
- Akaysha Energy’s Orana battery: 415 MW and 1,660 MWh.
- Iberdrola’s Smithfield battery: 65 MW and 130 MWh.
- Enel X’s virtual power plant: 95 MW of demand response, with a minimum dispatch duration of two hours.
The government estimates that the combined projects can support the peak demand of around 400,000 households. That is a program-scale comparison, rather than a promise of continuous supply to a particular group of homes.
Power and stored energy are different
Megawatts describe the rate at which a battery can deliver power. Megawatt-hours describe how much energy it can store. Dividing Liddell’s stated 1,000 MWh by 500 MW gives a nominal two-hour duration at rated power. Actual dispatch also depends on operating conditions and system requirements.
The same distinction matters when comparing a home battery. A large energy capacity can carry modest loads for longer, but does not automatically mean the system can start or run every large appliance at once.
What does this mean for a household?
Grid storage helps manage the electricity system. It does not set your retail tariff, remove your daily supply charge or provide backup through a failed local power line. The effect on an individual bill depends on the wider market and the household’s retail plan.
A home battery has a different job: storing energy behind your meter. Whether that is worthwhile depends on your surplus solar, evening demand, tariff and installed cost. Backup is a separate design question involving supported hardware and nominated circuits.
Contact Lightning Energy to discuss the options for your property and electricity use.
