The 29th Alberta Legislature was formed after the 2015 election, during which the New Democrats won their first majority government under the leadership of Rachel Notley.
The by-election was held when Dave Rodney resigned his seat on November 1, 2017 to make way for Jason Kenney, the leader of the newly-formed United Conservative Party.
[5] The riding of Calgary-Greenway was left vacant on November 23, 2015, when incumbent Progressive Conservative MLA Manmeet Bhullar was killed in a vehicle accident on Alberta Highway 2.
[7] The by-election resulted in a Progressive Conservative hold, but saw the vote share for that party drop by 15 points from the 2015 election.
[8] This had the effect of voiding the election result, and necessitated the calling of a by-election to fill the seat.