Pacific Gas & Electric Company + Wärtsilä

Reference case

Sustainable power generation to meet California's environmental regulations

The plant is located in Humboldt County near Eureka in northern California. Pacific Gas and Electric Company (PG&E) selected Wärtsilä's technology in order to replace two 50-year-old gas turbine units on the same site. Compared to the old turbine power plant, the new facility is 33% more efficient with 85% fewer ozone-forming compounds, and a 34% reduction of greenhouse gas emissions production. The plant was designed to meet California's stringent air permitting requirements, and the regulations of California Energy Commission.

The facility consists of ten Wärtsilä 18V50DF dual-fuel engines delivered on an engineering, procurement and construction (EPC) basis. The quick-starting engines are fuelled by natural gas, and use ultra-low sulphur diesel as a back-up during times of natural gas curtailment. The plant is capable of producing enough electricity to serve approximately 125,000 homes.

The generating station employs a closed-loop cooling system with negligible water usage, eliminating the use of water from Humboldt Bay for cooling. According to EG&P, the Wärtsilä engine technology is ideal for providing a reliable backup to intermittent renewable resources, such as wind power resources, which are currently being developed in the region.

WhoPacific gas and electronic company
What163 MW Humboldt Bay generating station
WhereHumboldt Bay, California
How10X50DF EPC


This is what we achieved


Households powered in Humboldt Bay.


Reduction of greenhouse gas emissions production.


Of electrical output.

How we did it

Challenge icon


  • To replace two 50-year-old gas turbine units on the same site
  • To meet California's stringent air permitting requirements, and the regulations of California Energy Commission
Solution icon


  • The ultimate fuel flexibility Wärtsilä 50DF four-stroke multifuel engine generating set
  • Engineering, procurement and construction (EPC) deliveries and full lifecycle support that ensure guaranteed performance
Benefit icon


  • Ensured reliable electricity supply to local community
  • Compliance with the strict requirements and regulations of the California Energy Commission
Humboldt Bay Generating Station

The main details

CustomerPacific gas & electronic company
TypeWärtsilä 50DF baseload power plant
WhereHumboldt Bay, California
Total output163 MW
FuelFual fuel



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