Siemens will be supplying 149 of its 2.3MW turbines for the Lower Snake River Wind Project in Garfield County, in the Southeastern corner of the state.
The deal also includes a five-year service and maintenance agreement. PSE has an option to purchase another 110 turbines for later phases.
It follows last month's capture by Siemens of the Cape Wind offshore contract to supply 130 3.6MW turbines. The company is also building a manufacturing facility in Kansas and planning another for Massachussets.
Speaking about the deal, Siemens Energy CEO for renewable energy said: "This order is an important stepping stone towards becoming one of the top two wind turbine supplier in the US.
"We look forward to working with PSE to further advance its renewable energy initiative in the United States."