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  1. 1. HYDROPOWER <ul><li>Energy of moving water </li></ul><ul><li>As long as sun shines and rain and snow fall we will have hydropower </li></ul>
  2. 2. History <ul><li>Greeks used water wheels to grind wheat into flour over 2000 years ago </li></ul><ul><li>In early 1800’s, water wheels were used to power machines in factories </li></ul><ul><li>In the late 1800’s, </li></ul><ul><li>hydropower was first used </li></ul><ul><li>to generate electricity </li></ul>
  3. 3. Photograph of old power plant above Niagara Falls
  4. 4. Niagara Falls , American Falls
  5. 5. Easier to build on a river where there is a natural waterfall Athabasca Falls, Oregon
  6. 6. Dams make artificial waterfalls Bonneville Dam on the Columbia River between Washington & Oregon
  7. 7. The water held back by the dams (reservoirs) are stored energy Lake Powell Utah
  8. 8. The dam needs gates to open & close
  9. 9. The water spins the blades of the turbines <ul><li>This is a turbine that has been </li></ul><ul><li>replaced at the </li></ul><ul><li>Bonneville Dam </li></ul>
  10. 11. Old turbine being removed
  11. 14. Replacement Turbine
  12. 15. the generator (the turbine is underneath)
  13. 16. <ul><li>Row of turbines </li></ul><ul><li>in the </li></ul><ul><li>powerhouse </li></ul>
  14. 18. Power plant at Bonneville Dam
  15. 19. Advantages <ul><li>Cheapest way to produce electricity in the United States </li></ul><ul><li>Does not pollute </li></ul><ul><li>Does not add to global warming </li></ul><ul><li>Is a renewable energy source </li></ul>
  16. 20. Disadvantages <ul><li>*Changes the flow of the river </li></ul><ul><li>*Land floods where reservoir is formed </li></ul><ul><li>*Some beautiful, fertile land might be flooded </li></ul><ul><li>*People and businesses may need to relocate </li></ul><ul><li>* Fish and wildlife may be disturbed </li></ul>
  17. 21. Example: Pacific Salmon
  18. 26. Top view of fish ladders
  19. 29. Window into fish ladder
  20. 34. Hydropower in the U.S. <ul><li>Most hydropower </li></ul><ul><li>1. Washington </li></ul><ul><li>2. California </li></ul><ul><li>3. New York </li></ul><ul><li>4. Oregon </li></ul><ul><li>5. Tennessee </li></ul>
  21. 35.