The Swan-Tyee transmission line ('STI') was constructed using helicopters as there is no continuous road connection along the remote and rugged terrain of the intertie alignment. Maintenance is conducted using helicopters to access each tower location using temporary log helicopter landing pads built in conjunction with the original intertie construction. These existing log landing pads require replacement with more permanent, safer structures to permit unloading and loading of people and cargo. The project will also include adding helipads to the rest of the SEAPA transmission lines connecting the facilities to the Member Utilities.
- The STI is a 57-mile 138kV transmission line that navigates extremely rugged terrain, and in most cases is only accessible by helicopter
- Access to the lines is exceptionally important to the reliability of power delivery
- The STI was built without helicopter landing pads making line maintenance difficult
- The pads in existence are in need of reinforcement or replacement
- 105 new helicopter pads are needed
- This is a multi-year project which includes designing, testing, and installation
- This will allow for helicopters to safely land at STI sites for maintenance and other activities pertinent to the planning and forecasting processes of hydroelectric power in Southeast