York Haven, Kern Canyon, and Green Lake

York Haven began commercial operations in 1901, making it one of the oldest hydroelectric projects in America.

This historic photo shows one of York Haven's original vertical-shaft hydroelectric generators from the early 20th century.

This historic photo shows York Haven's original turbine hall, where the physical power of moving water is turned into usable energy.

Today, York Haven's turbine hall houses 13 horizontal Francis turbines, 4 vertical Kaplan turbines, and 3 vertical propeller units.

York Haven's control room is used to monitor and manage water flow, dam gates, turbine speeds, and electricity generation.

The Kern Canyon Project is a run-of-river facility, diverting water upstream which then travels down a tunnel and into the facility.

After a rockslide in 2017, the Kern Canyon facility installed rockfall protection to improve dam safety and reliability.

This photo shows damage to the dam's intake structure following the 2017 rockslide.

This photo shows the dam's repaired intake structure after the 2017 rockslide.

A large vertical-shaft hydroelectric generator inside the Kern Canyon powerhouse.

The Green Lake Hydroelectric Project is located on a major reservoir in a mountainous and remote region in Southeast Alaska.

The Green Lake dam is nestled in the rugged peaks of Baranof Island.

The Green Lake dam is one of two hydropower facilities that provides year-round electricity to Sitka’s 8,700 residents.