Redistribution (Australia)
Section 24 of the Constitution of Australia requires that the total number of members of the Australian House of Representatives shall be "as nearly as practicable" twice as many as the number of members of the Australian Senate. There is presently a total of 76 senators: 12 senators from each of the six states and two from each of the two autonomous internal territories (the Australian Capital Territory and the Northern Territory). There are 150 members of the Australian House of Representatives.
Elections in Australia
The Australian Constitution requires that in half-Senate elections the election of State senators must take place within one year before the places become vacant. As the terms of half the senators end on 30 June, the writs for a half-Senate election cannot be issued earlier than the previous 1 July. There is no constitutional requirement for simultaneous elections for the Senate and the House of Representatives, and elections for half the Senate only have taken place in the past. There is a government and electorate preference for Senate elections to take place simultaneously with those of the House of Representatives. Except in the case of a double dissolution, the Senate is not dissolved when elections for the Senate are called and can continue to sit until the term expires. However, it is now a practice for the Senate to be prorogued when the House is dissolved, so that it does not sit during the election period.