Puget Sound Energy's Snoqualmie Falls hydropower project reopens after overhaul

Snoqualmie Falls Hydroelectric Project

One of the Pacific Northwest's oldest power plants, the historic Snoqualmie Falls Hydroelectric Project, is once again producing electricity for local homes and businesses following a three-year overhaul.

Puget Sound Energy's 102-year-old Plant 2 powerhouse at Snoqualmie Falls, idled in June 2010, last week restarted commercial generation of electricity. Located about a quarter mile downstream from the falls, the plant underwent near-total reconstruction under a new, 40-year federal operating license.

HydroWorld.com reported that the Federal Energy Regulatory Commission had approved a US$250 million plan for the project's rehabilitation in June 2009, which followed a decision by the 9th U.S. Circuit Court of Appeals to uphold its license in October 2008.

The energy site's Plant 1 powerhouse — just upstream from the falls in a bedrock cavity almost 270 feet underground — also is getting a comprehensive makeover. Built in 1898-99, the older powerhouse is scheduled to resume generating hydropower in July.

Once Plant 1 comes online this summer, Snoqualmie Falls' generating capacity will be 54 MW, compared to about 44 MW previously. The increased output, enough to serve about 40,000 homes, is being achieved through greater plant efficiencies; no additional water will run through the project's seven turbines.

Upgrades made at Plant 2 include:

  • A new steel and concrete intake structure along the river's edge for channeling water into a 1,215-foot-long underground tunnel that runs beneath the Salish Lodge and the upper portion of Snoqualmie Falls Park;
  • Relining of the 12-foot-diameter, underground tunnel;
  • A new Gate House that controls water flow from the tunnel to penstocks, which carry the water more than 1,100 feet down a steep hillside to the Plant 2 powerhouse;
  • One new, 7-foot-diameter penstock and one upgraded penstock for delivering water to Plant 2;
  • A completely rebuilt powerhouse building, reflecting the original structure's design;
  • A new, 13.7 MW turbine-generator, replacing the plant's original, 1910 turbine (the plant's 1957-vintage, 26.5-MW turbine-generator remains in use); and
  • A new bypass flow-control system, housed inside the new powerhouse, for ensuring public safety and maintaining consistent downstream flows for fish if an emergency shutdown of power generation were to occur.

Puget Sound Energy serves 1.1 million electric customers and more than 760,000 natural gas customers in 10 counties.

HydroVision International 2014 Keynote Speakers

Presenting the HydroVision International 2014 Keynote Speakers

Check out a slideshow covering the keynote speakers at the HydroVision International 2014 conference and exhibition

Click Here >>

Hydro Industry Financials

Buyers Guide Products

Modernization and renewal

TOSHIBA contributes to numerous modernizations ...

TES VSETIN Service Activities

Installation and initiation Operator training W...

Generators and Motor Repair

Service Activities: Installation and initiation...

Hydropower Generation Services OnSite

We evaluate each situation and provide turnkey ...

Maintenance & Construction Services

NAES is a leading provider of construction, ins...

Analysis, Repair & Upgrade Spring-bed Hydroelectric Bearings

Pioneer offer you the less expensive option to ...

Most Read Articles

Recent Comments

Buyers Guide Companies

SBIW Inc

Rehabilitation of turbine, generator and auxili...

Shenyang Getai Hydropower Equipment Co Ltd

Manufacturer of steel runner for water turbine,...

Alstom

Alstom provides products and services for turnk...

Ayres Associates

Provides inspection and FERC compliance, rehabi...

HydroWorks Ltd

Designs and manufactures Pelton, Francis and Ka...

Continuing Education

Professional Development Hours
To access a course listing associated to a specific topic listed below, click on the topic of choice from the list below.

09/01/2014
Volume 33, Issue 7
cover
07/01/2014
Volume 22, Issue 4
file

Archived Articles

2006 | 2007 | 2008 | 2009 | 2010 2011 | 2012 | 2013
Hydro Review Past Issues