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The members of the controlling group intend to purchase all of the shares being offered by Corfo, the release said.
The Chilean government will retain a 5% share in each of the utilities, in order to maintain its veto power over operations involving water rights transfers and concessions.
The government collected some US$984mn in the sale of its 30% stake in the country's largest water utility, Aguas Andinas, on June 15.
OTPP had C$108bn (US$111bn) in assets as of December 31, 2010.