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The Alberta Legislature in Edmonton on July 16.Amanda May Erickson/The Canadian Press

Alberta Premier Danielle Smith has called a by-election in a southern Calgary riding for Sept. 14.

Residents in Calgary-Shaw have been without a legislature representative since May, when former United Conservative Party cabinet minister Rebecca Schulz resigned her seat.

Both Smith’s UCP and the Opposition NDP named candidates for the riding in June.

Smith says her party’s candidate, Mike Derry, is community-minded and would be a strong voice for the riding in the legislature.

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NDP Leader Naheed Nenshi says Calgarians should put their trust in his party’s candidate, Kyle Campbell, and send a message to Smith that they don’t want a government that caters to separatists.

The newly created Progressive Tory Party, led by former UCP cabinet minister Peter Guthrie, is also expected to run a candidate in the by-election.