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The completion of one of the Dunedin City Council's most expensive recent projects will be celebrated at an official opening later this month.
Dunedin City Council operations manager Tony Avery said the completion of the $110 million upgrade of the Tahuna Waste Water Treatment Plant was a major part of wastewater treatment improvements the council agreed on in the early 1990s.
The first budgets for the two-stage project were set in 1992 and the first major part of the project, the construction of an outfall pipe that takes treated water 1100m offshore, began in 2006.
Project manager Chris Henderson said the whole plant was now operating as a unit at the standard the council intended it to.
Councillors and invited guests will take a tour of the plant before its official opening on June 26.