The NunatuKavut (noon-ah-TWO'-ha-voot) Community Council says transmission lines to Newfoundland will cut through its territory.
But the group representing the Inuit-Metis of southern Labrador says it has no faith in the environmental assessment process.
President Todd Russell says federal and provincial reviewers have failed to provide scientific data and have not given the group enough time to respond.
Russell says Ottawa and the province have not adequately consulted his group and have denied benefits related to the $7.7-billion project.
The province says it has consulted with the group, but has refused Muskrat Falls benefits because it has no land claim recognized by Ottawa.