Information commissioner Ann Cavoukian has tabled a scorching addendum to her headline-making report on Liberal staffers illegally deleting gas plant emails.

Cavoukian on Tuesday released a 30-page supplement to her earlier 35-page report castigating Grits for apparently destroying emails related to the $585-million cancellation of controversial power plants in Mississauga and Oakville before the last provincial election.

In June, the legislative watchdog blasted Craig MacLennan, a former chief of staff to past energy ministers Brad Duguid and Chris Bentley, and David Livingston, former premier Dalton McGuinty’s last chief of staff, for failing to preserve records.

“In light of the information I now have, I would have arrived at a different conclusion regarding the ability of MGS (Ministry of Government Services) staff to retrieve the relevant emails from Mr. MacLennan’s email account,” she wrote Tuesday.

“However, the other findings in my report were not affected and remain accurate.”

In her appendix, Cavoukian maintains that bureaucrats “misled” her when they claimed MacLennan’s email account could not be retrieved then later found 39,000 emails either sent or received by him on a backup computer drive.

“As an officer of the legislature, I expect the highest degree of co-operation and diligence from all institutions during my investigations. I was baffled as to how MGS staff could have failed to provide relevant, accurate information about the IT systems under its control,” said Cavoukian, the province’s information and privacy commissioner.

“More baffling was the fact that the resources that were brought to bear on the search for records in response to the justice policy committee’s motion were not brought to bear in the context of my investigation,” she said.

“I remain saddened at the failure of MGS staff to dedicate adequate resources to provide accurate and complete information to my office during the course of my initial investigation. I am left with the inescapable conclusion that they did not take my investigation very seriously,” said Cavoukian.

“The provision of inaccurate and incomplete information in my initial investigation is unprecedented during my tenure as commissioner.”

Deputy Minister of Government Services Kevin Costante has taken the blame for the initial botched email recovery effort.

“The deputy minister apologized profusely and acknowledged that my office had been provided with inaccurate and incomplete information regarding the OPS (Ontario Public Service) Enterprise Email System and the existence of possible back-up tapes from the relevant period,” added Cavoukian.

Opposition critics said her latest report is further evidence the government didn’t take her demands for internal documents seriously.

“Getting at the heart of this scandal is not something that is a government priority. Obscuring it seems to be a government priority,” NDP MPP Peter Tabuns told reporters during a break in the legislative committee probing the scrapping of the two gas plants .

“The information and privacy commissioner was just another victim of that approach,” said Tabuns, who filed the original complaint to Cavoukian about the missing emails.

In his testimony before the committee this past spring, MacLennan said he likes “to keep a clean inbox (and) I don’t know how to archive anything.”

Premier Kathleen Wynne distanced herself from her predecessor over the debacle.

“Let me be clear. The practice in my office and in the office of my caucus and my cabinet . . . has been to follow the rules,” Wynne said in June.

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In her original report, Cavoukian said she was “very disturbed” by MacLennan’s deletion of emails.

“It is simply unbelievable that MacLennan would have no understanding of this. It strains credulity to think . . . no records documenting the decision-making process were ever created,” she wrote in June.

However, in that first report she also asserted it’s a “myth” that deleted messages and documents can be recovered.