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Cr Wilson had been expected to step down from the DCC when local body elections are held in October.
However, she told the Otago Daily Times yesterday she had been "become energised" by the calibre of candidates coming forward to seek election to the ORC, and wanted to join them.
"I think it's a really exciting opportunity for change."
She would stand for a seat in the Molyneux Constituency, which covers the Clutha, Mosgiel-Taieri and Strath Taieri districts.
Cr Wilson, a four-term city councillor and chairwoman of the DCC's infrastructure services and networks committee, had planned to stand down from the DCC in 2016, only to change her mind.
She then signalled earlier this year that her fourth term would be her last, but yesterday said she now wanted to focus on improving the ORC's connections with the community.
"I've got a passion for Otago. I think we live in a wonderful place and I want to see it really working better together."