Labour leader Joseph Muscat said it was not enough for the chairman of the committee that had chosen a blacklisted company as a consultant on the Delimara power station extension to admit it had been a mistake.

"I still have to hear a government minister shouldering responsibility for the decisions taken with regard to the power station contract," Dr Muscat said in his first reaction to David Spiteri Gingell's comment on Monday.

Mr Spiteri Gingell, who had chaired the project's adjudicating committee, admitted on television he had made a mistake in not vetting Lahmeyer International before Enemalta appointed them as consultants to examine the power station bids.

Dr Muscat said what interested him was political responsibility.

"The only thing I have heard is the Prime Minister defending the project all the way," he said.

The Malta Environment and Planning Authority is expected to discuss and decide on the full development permit for the power station extension tomorrow.