By Dan Rudy 

SEAPA greenlights big maintenance projects at hydro plants


February 22, 2018

The Southeast Alaska Power Agency governing board earlier this month approved moving forward with a remote inspection of the tunnels underlying the Tyee Lake hydroelectric plant.

In his report to the board on February 8, SEAPA power systems specialist Ed Schofield explained a remotely operated vehicle would be needed to perform an inspection of the facility’s water conveyance structures. Unlike the dam at Swan Lake, Tyee is a natural lake which is tapped for the facility. Water is conducted to the powerhouse through an intake in the lake into a drop shaft, then through unlined rock tunnel...

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