Agreement commits Canada to prevent development on Indigenous land without adequate consultation.
Will consult with First Nations and community representatives on hydro electric project.
Utilities Commission says alternative energy, industrial curtailment could provide similar benefits with an equal or lower cost.
Court challenge would not be fought on environmental grounds, but on land, hunting and fishing rights enshrined in the Constitution.
Deloitte report says it would cost $1.4 billion to postpone, cancelling it outright would cost $1.2 billion.
Aboriginal rights must be balanced against other competing, critical interests.
NDP-Green agreement would send the project to utilities commission for a review of its economic viability.
Dam will be the third on the Peace River, flooding an 83-kilometre stretch of valley.
Job numbers reflect increased road construction, prepping for the dam and generating station.
Voith Hydro will provide six turbines and generators, plus equipment for the $8.8 billion project.
Protesters call for temporary suspension of land-clearing, construction and federal approvals.
Contract will be completed over eight years and is expected to employ up to 1,500 people.
Several groups with outstanding legal challenges against the megaproject.
Opposition looking ahead to election in 2017, won’t rule out cancelling Site C hydro project.
Authorizations have conditions under the land, water, forest and wildlife acts.