Power in Perpetuity -- Film Description:
"The development of Canada's water resources is often spectacular in its magnitude. This film describes the harnessing of Churchill Falls in the wilds of Labrador, a controlled drop of 75 m for the eventual output of 7 million hp of hydro-electricity. Some of the work of construction is shown; diagrams illustrate the conception of the whole scheme."
-- National Film Board of Canada

Source:
National Film Board of Canada. "NFB -- Power in Perpetuity" National Film Board of Canada. http://onf-nfb.gc.ca/en/our-collection/?idfilm=12671.