[Repeal The 17th]

Turbine floor at the Edward Hyatt power plant in Oroville Dam.
Image found here:
http://www.powermag.com/blog/oroville-dam-a-major-renewable-energy-asset/

[Repeal The 17th]

A better picture:

Found here:
http://www.water.ca.gov/swp/facilities/Oroville/EHyattPPphoto.cfm
"...Hyatt Powerplant was constructed in the bedrock
below Lake Oroville. A cavern the size of two
football fields was dug out to house the facility.
Of the six units, three can pump water or generate power..."