The Labour Party is calling for Solid Energy's former chief executive Don Elder to appear before the commerce select committee when its financial review is heard in March.
Labour commerce spokesman Clayton Cosgrove said Dr Elder must be allowed to appear before MPs at the committee and he had written to Solid Energy's new chairman Mark Ford and interim chief executive Garry Diack asking that the former chief executive appear.
"Solid Energy has gone from an export award-winning company bringing in millions of dollars to the taxpayer to a basket case," said Mr Cosgrove.
"MPs need to hear from the key people involved - Dr Elder's evidence is essential to understanding what happened to that failing company, who did what and who was responsible."
Dr Elder was chief executive during the review period.