Senator ROBERTS (Queensland) (14:33): Minister, you couldn't tell me the battery capacity your government is planning to build, so you may not be able to answer this question. But let's just say 'yes' or 'no', please. What is the capital cost of that battery backup, and how much of that bill will taxpayers pay? Simple. Honourable senators interjecting— The PRESIDENT: I will just wait for silence, particularly on my left. This is Senator Roberts's question.