The $1.7-billion North Montney Mainland Project would include a 300-kilometre pipeline connecting from northeast B.C. to the proposed Prince Rupert Gas Transmission Pipeline for export of liquefied natural gas.
The board found that the projects did not pose significant adverse environmental effects, although the construction is still subject to government approval.
There are 45 conditions attached to the approval for such issues as pipeline integrity, environmental protection and aboriginal consultation.
TransCanada president Russ Girling says the project is a critical component in the infrastructure chain that links Canada's natural gas supply to new markets.
The project is one of several pending in what Premier Christy Clark has boasted will be a multibillion-dollar industry for the province.