This is from TMP website under 'Benefits' (so you can take it with a grain of salt):
https://www.transmountain.com/benefits
Economic Benefits
The $7.4 billion* pipeline Project will increase the value of Canadian oil by unlocking access to world markets. A Conference Board of Canada report has determined the combined government revenue impact for construction and the first 20 years of expanded operations is $46.7 billion, including federal and provincial taxes that can be used for public services such as health care and education.
British Columbia receives $5.7 billion
Alberta receives $19.4 billion
The rest of Canada shares $21.6 billion
Municipal tax payments (not adjusted for inflation) total $922 million to BC and $124 million to Alberta over the first 20 years of expanded pipeline operations.