Construction started with site preparation activities in summer 2015 and will be completed in 2024.
That's just construction, there was probably years of design and planning before that.
Project capital cost estimate of $7.9 billion is peer-reviewed
https://www.sitecproject.com/sites/d...-case-2014.pdf
Demand was calculated based on LNG plans, I don't know if that's changed, but here is the resource explaining it.
https://www.sitecproject.com/sites/d...feb-2018_0.pdf
I wonder if there are transmission lines that run down to Vancouver from site C. It will probably just service Northern BC, in reality.