About the project

We are progressing the development of a new Battery Energy Storage System (BESS) adjacent to our existing Mt Piper Power Station near Lithgow, NSW.  

The project will use nearby existing electricity infrastructure to deliver a grid-scale battery energy storage system in stages, with a total planned capacity of 500 MW for up to four hours. Stage one will provide up to 250 MW of dispatchable electricity for four hours, enabling energy to be stored when supply is high and supplied back to the grid when demand peaks.

At full buildout, the Mt Piper BESS will operate as a 500 MW utilityscale battery—one of the larger systems proposed in NSW—and will play an important role in supporting Australia’s clean energy transition.

Why it is needed

A Battery Energy Storage System captures energy from multiple sources, stores it, and discharges it when electricity demand is higher or supply is lower.  

As renewable energy generation continues to grow, large batteries help to balance the system, support grid reliability, and provide fast-acting power during peak demand periods or unexpected disruptions.  

The Mt Piper BESS will help firm renewable energy, strengthen energy security, and support a more reliable, lower-emissions electricity system for New South Wales.