French renewables and storage developer Neoen has decided to increase the size of its large battery under construction in Queensland by 35 per cent in a further sign of the surge of investment in capacity that supports the push to weather-dependent wind and solar.

The Western Downs battery in Queensland will now be built to a capacity of 270 megawatts of power and 540 megawatt-hours of storage, meaning the plant will be able to supply at full capacity for two hours.