A new 100 megawatt (MW) and up to four-hour big battery could be ready to start storing and dispatching renewable energy on Australia’s most isolated grid in time for summer, with construction of the project said to be nearing completion.
Located just south-west of the town of Merredin in the WA Wheatbelt region, the 400 megawatt-hour (MWh) Merredin battery energy storage system (BESS) began construction in August 2025, after the Atmos Renewables project reached financial close July.
WA energy minister Amber Jade Sanderson said on Facebook on Sunday that the BESS is almost ready to be switched on, with construction wrapping up and the battery set to be energised in September before final testing.
“Construction is wrapping up, with the battery set to be energised in September before final testing ahead of summer,” the minister said in a FB post.
“Once fully operational, it will help bring more renewable energy onto WA’s grid and support a stronger, more reliable power system when demand is at its highest.
