Wrangell Sentinel -

The Southeast Alaska Power Agency governing board last week 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 tunnels about 8...