A report that recommends putting a price on emissions from the electricity sector has been held back by the Climate Change Authority until after the election, prompting calls from Labor and the Greens that it be made public to inform debate.

The independent authority, whose board is now dominated by appointments made last October by Environment Minister Greg Hunt, was to have released its policy options paper for the power industry by the end of April.

The board, though, decided to withhold the report - along with the large Special Review due out by June 30 - until after the election, "assuming it is called for early July," the authority said on its website.

"Why would the authority not release something before the caretaker period?" a source said to Fairfax Media about the report on the power sector, which creates about one-third of Australia's carbon emissions.