|Election||Premier at election||Premier's party||Premier after election||Premier's party|
|ACT 20 October 2012||Katy Gallagher||Australian Labor Party||Katy Gallagher||Australian Labor Party|
Change of party leader (Stanhope): Beginning of Galagher's first period in office; Chief Minister Stanhope resigned from office and supported his deputy, Gallagher, in her contest for the leadership of the parliamentary Labor Party. Gallagher was chosen as leader by caucus unopposed and was elected by the Legislative Assembly on 16 May 2011 to be Chief Minister of an Australian Labor Party minority government supported by a parliamentary agreement with the ACT Greens.
For details of this transition, see Scott Brenton, 'Australian Capital Territory', Australian Journal of Politics and History, Australian Political Chronicle, 57 (4) December 2011: 661-666.
Change of partisan support for Premier: Beginning of Gallagher's second period in office as Chief Minister; At the election for the ACT Legislative Assembly on 20 October 2012, both the Australian Labor Party and the Liberal Party won eight seats in the 17 seat Assembly. The ACT Greens, who had supported the previous Australian Labor Party minority government under Chief Minister Gallagher, lost three of their four seats with Shane Rattenbury as their sole representative. After a period of negotiation betwee the ACT Greens and both the Labor and Liberal parties, the ACT Greens agreed to join the Labor Party in a coalition government, a commitment the ACT Greens had not previously been willing to make.
A formal agreement was made between the Labor Party and the ACT Greens on 2 November 2012 covering a range of policy commitments for the new government and Rattenbury joined the Gallagher ministry as a minister in an Australian Labor Party and ACT Greens coalition government. Gallagher was elected as Chief Minister in the Legislative Assembly on 6 November and a list of ministers and their responsibilities was issued on 9 November 2012.