Australia's biggest wind farm has been commissioned on time, and may have found a blueprint for others to follow.

Two new big battery projects have been energised on Australia's main grid in the past few days, underlining the speed and scale of the storage rollout in Australia.

Days after dumping its renewable energy targets and pledging billions of dollars in support of coal power generation, state launches rebate targeting solar for renters.

Abundance defines the day as wind and solar curtailment hits new peaks, accounting for more than 90 per cent of one state's demand. More batteries then.

A groundbreaking trial to test an innovative alternative to rooftop solar export tariffs will run for another year and with double the number of participants.