Hydropower

  • As of 2010, 5.8% of power supply in the United States, projected 5.9% by 2035. Largest renewable source EEI, 40

How does it work?

  • Water flow moves a primary mover such as a turbine or water wheel
  • Run-of-the-river does not interfere with the flow of water; dammed hydropower involves blocking the water flow to constrict flow points (increasing pressure) and/or to build up hydrostatic head for more convenient timing
  • Flow can be moderated with sluice gates

Turbine types

Hydro and storage

  • One of the oldest forms of energy storage is behind a dam– including using the energy of water flow at times where capacity is higher than demand to pump water back up into a reservoir

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