MONTREAL - Environmental groups have filed an application for a judicial review challenging a joint panel's assessment on the proposed $6.2-billion Muskrat Falls hydroelectric development in Labrador.

The groups, represented by lawyers for Ecojustice, filed the application with the Federal Court, arguing that the assessment was incomplete.

A spokesman for Sierra Club Canada, one of the groups behind the application, says the assessment doesn't look at alternatives to the project or make any final recommendations to approve or reject it.

Bruno Marcocchio says they want the court to send the review back to the panel to assess the need and effects of the project.

Marcocchio says he is confident that if the panel were to re-examine its review, it will find the project is not justified.

The Muskrat Falls project passed the federal and provincial environmental assessments Thursday.