Senator DI NATALE (Victoria—Leader of the Australian Greens) (14:15): My question is for the Leader of the Government, representing the Prime Minister. Yesterday, the Senate ordered the government produce the detailed modelling behind the $550 NEG saving. This morning, the government's non-response confirms what we all suspected: there is absolutely no evidence to support your claims of lower power prices under the NEG; households are still waiting for the $550 that you promised after scrapping the carbon price. Senator Ian Macdonald interjecting— The PRESIDENT: Senator Macdonald, I have asked for silence during questions already this question time. Please continue, Senator Di Natale. An honourable senator interjecting— The PRESIDENT: You can take a point of order, Senator Macdonald. Senator Ian Macdonald: This particular senator keeps making a statement and an argument to the Senate in the guise of question time. I've heard what you've said before, Mr President, but that is not asking a question at question time. It is making a political point and an argument that should not be allowed. The PRESIDENT: Senator Macdonald, the standing orders allow a minute to ask a question. A question is allowed to have a preface but it must have a question. Senator Macdonald, I'm happy to take this up with you after question time. I respect you've been here a lot longer than I, but it's the well-established practice that questions can take time to ask. Senator Di Natale, please continue. I don't think you need to start again. I heard— Senator DI NATALE: I don't know where I was. The PRESIDENT: Senator Di Natale, please continue. Senator DI NATALE: I rise on a point of order. The PRESIDENT: What is the point of order? Senator DI NATALE: Senator Macdonald is a serial offender in standing up and interrupting questions while they're being asked. It is disrespectful and, in light of the conversation and your statement yesterday, what I heard from Senator Macdonald was him indeed dissenting to your ruling. It's unacceptable and he does it repeatedly. The PRESIDENT: Senator Bernardi on this point of order? Senator Bernardi: Yes. I wonder whether it's in order for a senator to take a point of order on themselves? The PRESIDENT: I will rule on the point of order. Senator Di Natale, I have called the Senate to order. I've addressed the matter raised by Senator Macdonald. I asked for a question to start earlier before because the noise level was so high and no-one could hear it. This was about one interjection. I could hear the question, as could many others, but I was being consistent in my rulings to ensure a senator was heard in silence. I ask you to continue your question. Senator DI NATALE: Given that households are still waiting for the $550 that you promised after scrapping the carbon price, we know they won't be fooled twice and they know the NEG won't reduce the power prices. Given the energy mix will stay the same over the next decade, how does the NEG magically reduce prices for consumers?