The utility wants to establish the "most cost effective way" to source the new wind projects, it said. It had previously said it planned to add 859MW of new wind capacity by 2020.
Stefan Bird, president and CEO of Pacific Power, the unit of PacifiCorp that serves customers in Oregon, Washington, and California, said: "These new wind resources are a key part of the company’s plan to both meet customer energy needs and continue our cost-conscious transition to less carbon-intensive energy."
The RFP, issued on 27 September, differentiates between projects in Wyoming and those not in Wyoming.
Projects proposed for Wyoming would be interconnected with or deliver to the utility’s proposed 225-kilometre 500kV substation and transmission system, the company said.
The company expects to make a decision on projects by mid-April 2018.
The RFP is part of the company’s Energy Vision 2020, an energy plan announced in April 2017.
Under the plan, the utility also wants to repower more than 1GW of its existing wind fleet spread across Wyoming, Washington and Oregon.
PacifiCorp previously stated that the bulk of the new wind projects would be in Wyoming and announced a €3.5 billion investment in fulfilling its plan.