Commonwealth Consolidated Acts Commonwealth Consolidated ActsWhenever the number of senators for a State is increased or diminished, the Parliament of the Commonwealth may make such provision for the vacating of the places of senators for the State as it deems necessary to maintain regularity in the rotation.
15 Casual vacancies
If the place of a senator becomes vacant before the expiration of his term of
service, the House of Parliament of the State for which he was chosen shall,
sitting and voting together, choose a person to hold the place until the
expiration of the term, or until the election of a successor as hereinafter
provided, whichever first happens. But if the Houses of Parliament of the
State are not in session at the time when the vacancy is notified, the
Governor of the State, with the advice of the Executive Council thereof, may
appoint a person to hold the place until the expiration of fourteen days after
the beginning of the next session of the Parliament of the State, or until the
election of a successor, whichever first happens.
At the next general election of members of the House of Representatives, or at
the next election of senators for the State, whichever first happens, a
successor shall, if the term has not then expired, be chosen to hold the place
from the date of his election until the expiration of the term.
The name of any senator so chosen or appointed shall be certified by the
Governor of the State to the Governor‑General.