Despite harsh elements and a remote site, an army of workers reach critical milestones on decade-long dam project in British Columbia.

Electron Hydro LLC and its chief operating officer pleaded guilty to a gross misdemeanor violation of operating an unlawful hydraulic project, and face a record state penalty for an environmental crime.

Critics from industry and academia are raising questions about a study from the University of Oxford's Saïd Business School about the true cost of large hydropower dams.