Joint Review Panel
Environmental groups say decision is invalid because NEB has failed in its mandate to protect the public interest.
Some experts fear the 15-page letter will intimidate people unfamiliar with the process into withdrawing their applications.
Environmental groups say choices now include legal avenues, political campaigns and direct action.
National Energy Board Joint Review Panel on Enbridge Northern Gateway Project decision to be handed down Thursday in Calgary.
Independent federal agency, National Energy Board, directly coordinated effort between CSIS, the RCMP and private oil companies.