The biggest battery ever constructed in Queensland will be built over the next year, adding certainty to the power grid as it transitions towards renewable energy.

The 100-megawatt battery has been commissioned by AGL Energy and will link to its Coopers Gap Wind Farm near Wandoan on the Western Downs.

AGL chief executive Brett Redman said the battery would add certainty to the existing renewable energy sources by providing baseload power consistency.

An artist's impression of the battery facility near Wandoan.

“Batteries will be pivotal to providing firming capacity when the sun isn’t shining and the wind isn’t blowing, and the market needs the capacity,” Mr Redman said.