What weighs 120 tons and has been generating clean and reliable hydropower for 52 years? A turbine runner at Noxon Rapids Dam that has been in service since the dam’s opening in 1959.
On October 19, the project reached a milestone. The last turbine to be upgraded at Noxon Rapids Dam was removed from service. The removal of the turbine is part of a $45 million project to upgrade four original generating units with newer, more efficient technology. The project started in July 2008 and is on schedule to be finished by spring 2012.
The upgraded units are expected to increase the total generating capacity of the dam by an estimated 30 megawatts. The upgrades enhance Avista’s ability to serve our customers because it lets us generate more power using the same amount of water, rather than securing it somewhere else. The new turbines also boast features such as smooth edges and corners and a stainless steel body that weighs just 65 tons. The incremental energy they produce is already helping Avista meet its Washington State renewable portfolio standards as well.
Removing an old turbine isn’t easy business. They are cast steel beasts weighing approximately 120 tons. The prep work alone takes hundreds of hours of skilled labor and craftsmanship to get the turbine ready for retirement. Once the big day comes, a large crane is used to lift it out of the penstock. It’s a slow and careful process that takes a full day to complete, which makes Noxon Rapids’ stellar safety record of 20 years and counting for zero lost-time accidents even more impressive.
The final new replacement turbine is expected to be in service by spring 2012. As for the old turbine, we hope to move it to the dam’s public viewing area as an added attraction to an already beautiful and scenic park.