Senator ROBERTS (Queensland) (14:31): My question is to the Minister representing the Minister for Energy, Senator Seselja. Minister, the Western Australian Liberal-National opposition has committed to shutting down Western Australian coal power by 2025. In the place of reliable base-load coal power there will be $16 billion worth of wind and solar power. The role of maintaining back-up power to the entire Western Australian grid when wind and solar fail, as they inevitably do, will fall to a battery. Minister, can you explain to the house how Western Australia's 2,500 megawatts of average daily power use can be met by a battery, and how many calm, rainy days in a row will put the entire state into a blackout?