Solid Energy's former chief executive Don Elder and former chairman John Palmer appeared before the committee last week.
They said the company's problems were the result of high debt levels resulting from big investments in its coal mines in conjunction with a "perfect storm'' of falling coal prices last year.
Treasury is expected to release a series of documents detailing the company's recent activities and interactions with ministers in the next day or so.
Green Party energy spokesman Gareth Hughes said the Government was shutting down parliamentary scrutiny of Solid Energy.
"The financial meltdown at Solid Energy is deeply embarrassing to the Government and ministers because it highlights their lack of oversight and flawed shareholder strategy.''
Parliament needed to know what went wrong at Solid Energy so mistakes could be avoided in the future.
"That will be harder to do now that the select committee cannot investigate the issue,'' he said.