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In the 1930's when the hoover dam was built it costed the Americans around $50,000,000 in today's terms with inflation it would now cost $690,000,000. The American government says it can supply 20,000 homes with electricity instead of using fossil fuels (non renewable energies).
It took about 35 years to pay back the money it costed to build in electricity bills and also doesn't harm the environment as much as fossil fuels although the concrete used to make the dam comes too 3,250,000 cubic yards.
It took about 35 years to pay back the money it costed to build in electricity bills and also doesn't harm the environment as much as fossil fuels although the concrete used to make the dam comes too 3,250,000 cubic yards.