Federal Energy Minister Angus Taylor will apologise to Sydney's Lord Mayor for "not clarifying" figures he used to criticise her over the council's travel costs.

Key points: Angus Taylor had accused the City of Sydney of spending more than $15 million dollars on travel

Angus Taylor had accused the City of Sydney of spending more than $15 million dollars on travel However he now concedes the figures were incorrect

However he now concedes the figures were incorrect But he insists neither he nor anyone in his office altered an allegedly forged document

Mr Taylor conceded the $15 million figure he cited in the letter to Clover Moore was incorrect, however he insisted the information was available on the council's website.

"The last 24 hours has seen outrageous accusations made against me by the Labor Party," the Minister said in a statement.

"I reject absolutely the suggestion that I, or any members of my staff, altered the document in question; however, I will be writing to the Lord Mayor to offer my apologies for not clarifying those numbers with the City of Sydney before writing to her.

"There is clear evidence on the City of Sydney's own website, that there are different versions of the same report online right now."

Mr Taylor used the $15 million figure in a letter to Cr Moore at the end of September, where he argued cutting down on "unnecessary air travel" would provide a "real opportunity for your council to make a meaningful contribution to reducing Australia's emissions".

Details of the letter were published in Sydney's Daily Telegraph newspaper at the time.

The Lord Mayor responded to the Minister by accusing him of using a "fraudulent document" and stating the council's annual report showed a travel bill in the range of $6,000.

Labor has called on New South Wales Police to investigate the matter, a day after Mr Taylor faced sustained questioning in Parliament.

"These are incredibly serious questions to answer surrounding this scandal," Labor frontbencher Mark Butler said on Friday.

Mr Taylor said Labor had a track record of "using police referrals as a political tool".

"The Labor Party has, in typical fashion, dramatically overreached by claiming the documents were forged or altered. There is absolutely no basis for these assertions," he said.

A spokesman for Cr Moore said Mr Taylor had not explained where the incorrect figure came from.

"The figures used by the Minister are not a small variation, they are grossly inaccurate," a statement said.

"There are no alternative versions of the report online."

The Lord Mayor said while the annual report was uploaded as both a PDF and a Word Document, their content was identical.

"At no time have the false figures appeared in the City of Sydney's publicly available annual reports."