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Power Builds Ships: Northwest Hydropower Helps Win World War II​ (1942)
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​"Power Builds Ships" is a rarely seen short film that BPA produced during World War II. This 1942 color film illustrates how the abundance of hydroelectric power from federal dams on the Columbia River transformed the production of Liberty cargo ships. The large supply of electric power allowed steel mills to operate at peak production and ship builders to arc weld the ships instead of using rivets to assemble them. This process allowed Northwest shipyards to cut the production of a Liberty ship from 226 days to just 10 days.
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