Track Record

Project Portfolio

Over two decades of hands-on field work — from apprentice to foreman — across gas turbines, geothermal generation, hydroelectric, and industrial turbomachinery at some of the most demanding facilities in North America.

Apprentice & JourneymanJanuary 2004 – March 2014

TMC / Wood Group

A decade of field experience spanning GE gas turbine overhauls, geothermal generation, large industrial steam turbines, and balance of plant work across California, the Pacific Northwest, and Texas.

GE gas turbine overhaul and inspection work

GE Gas Turbine Overhauls & Inspections

  • City of ReddingUnits 2 & 3 — Frame 5 Hot Gas Path inspection and overhaul
  • Foster Wheeler MartinezFrame 6 Combustion Inspection and Overhauls — CT 1 & 2
  • Puget Sound Energy — Bellingham, WAFrame 6 Hot Gas Path inspection
  • Calpine King CityFrame 7 Combustion Inspection and generator overhaul
  • Calpine PastoriaFrame 7FA — CT 2 and CT 4 overhauls

Geothermal Turbine Overhauls — The Geysers, Northern CA

  • Calpine — Aidlin 1 & 2Toshiba, GE, Fuji, and Mitsubishi geothermal turbine overhauls
  • Calpine — Bear Canyon 1 & 2Geothermal turbine overhaul
  • Calpine — Big GeysersGeothermal turbine overhaul
  • Calpine — Grant, Ridgeline, Quick SilverGeothermal turbine overhauls
  • Calpine — Eagle Rock, SonomaGeothermal turbine overhauls
  • Calpine — Calistoga 1 & 2, Lake View, Cobb CreekGeothermal turbine overhauls
  • NCPA GeysersUnit #1 overhaul

ABB VAX & Industrial Steam Turbines

  • GWF — Site 1, Site 3, and HanfordABB VAX inspections and overhauls
  • Calpine King CityST1 LP overhaul
  • PGE Boardman — OregonUnit 4 overhaul
  • Mustang Station — Denver City, TXST1 overhaul

Balance of Plant

  • Tesoro Golden Eagle RefineryBalance of plant mechanical work
  • Western Refining — El Paso, TXBalance of plant mechanical work
  • Chevron RichmondFCC unit balance of plant

Hydroelectric

  • City of UkiahRefurbishment of Units 1 & 2
  • SMUD Union ValleyTurbine overhaul
  • PG&E POETurbine overhaul and upgrade
Foreman & JourneymanMarch 2014 – March 2018

North American Energy Services

Four years leading and executing hydroelectric projects in Alaska, including new turbine construction and Pelton turbine overhauls at remote generating facilities.

Hydroelectric turbine new construction — Blue Lake, Sitka AK

Hydroelectric — New Construction & Overhaul

  • City of Sitka — Blue Lake Hydroelectric Expansion — Sitka, AKNew construction of three Gilkes hydro turbines — full mechanical installation from foundation through commissioning
  • Homer Electric — Bradley Lake — Homer, AKFuji Pelton turbine nozzle overhaul — Units 1 & 2
Foreman & JourneymanMarch 2018 – Present

Stephens Mechanical

Foreman and journeyman work spanning hydroelectric maintenance, geothermal overhauls, diesel/gas generator maintenance, and specialty mechanical projects across California.

Power generation facility maintenance and overhaul

Power Generation

  • PG&E GatewayBalance of plant and ACC fan maintenance
  • PG&E HumboldtMaintenance and overhaul on V18 Wärtsilä diesel/natural gas generators
  • PG&E Potter ValleyWicket gate adjustment and bearing rebuild
  • Calpine Geysers — Units 7 & 16Overhaul and generator repair
  • UC BerkeleyBrush generator overhaul

Specialty Mechanical

  • Caltrans — Rio Vista BridgeInstallation and alignment of gearboxes
ConsultantIndependent Consulting

Kosonen Consulting LLC

Independent consulting engagements focused on hydroelectric turbine assessment, nozzle refurbishment, and parts fit-check services for utility operators in the Pacific Northwest and Alaska.

Pelton turbine nozzle and runner consulting work

Hydroelectric Consulting

  • Snohomish County Public Utility DistrictFuji Pelton nozzle refurbishment — Units 1 & 2 (consultant role)
  • Homer Electric — Bradley Lake — Homer, AKFit check of new replacement parts in advance of upcoming Pelton nozzle upgrade

Qualifications

Skills & Training

Core Skills

  • Laser Alignment
  • Optical Alignment
  • Precision Measurement Tools
  • Shaft Alignment
  • Rigging
  • Bridge Crane Operation (NCCO Certified)
  • Welding
  • Machinery Installation

Education & Additional Training

  • Elliott Factory TrainingSteam turbines and centrifugal compressors — Jeannette, PA
  • Wood Group Gas Turbine ClassGE frame turbine systems and overhaul procedures
  • Millwright Apprentice School2004–2007 — Precision tools, shaft alignment, turbine class, welding, rigging, machinery installation
  • NCCO Bridge Crane CertificationCertified overhead bridge crane operator

Work With Us

Your Facility Could Be Next.

Whether it's a turbine assessment, a major overhaul, or a long-term O&M strategy — bring in a consultant who has done this work firsthand, at facilities just like yours.

Kosonen Consulting LLC

Power generation consulting specializing in hydroelectric turbines. Serving utility companies and energy operators across the Pacific Northwest and California.

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Serving utility companies and energy operators nationwide.

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