It says on their website:
The National Energy Board...is an independent federal agency established in 1959 by the Parliament of Canada to regulate international and interprovincial aspects of the oil, gas and electric utility industries. The purpose of the NEB is to regulate pipelines, energy development and trade in the Canadian public interest. These principles guide NEB staff to carry out....
It never mentions environment anywhere in there. So this is an organization that has not seen that a key purpose includes protecting the environment--