State Energy Minister Mark McArdle held a Liberal National Party fundraiser at the offices of one of the nation's largest energy companies, but did not declare it in his ministerial diary.

The 2013 event was held in the boardroom of ERM Power, one of many meetings between the minister, the energy company and lobbying firm SAS Group, according to documents seen by Fairfax Media.

Queensland Energy and Water Minister Mark McArdle. Credit:Harrison Saragossi

A spokesman for Mr McArdle said the minister always complied with the reporting obligations set down by Premier Campbell Newman's demand for the most transparent and accountable administraton in Queensland's history, but the boardroom fundraiser did not fall into the category of a reportable event.

"Fundraising is carried out by the party organisation in strict compliance with state and federal laws," the statement says.