TB Flats I & II Wind Project

Rocky Mountain Power, an operating entity of PacifiCorp (a subsidiary of Berkshire Hathaway Energy), selected Mortenson to construct the 503.2-megawatt (MW) TB Flats I & II Wind Project. Located in Medicine Bow, Wyoming, the project is currently the largest energy-producing facility in Wyoming. The site spans 44 square miles of mostly flat terrain with some rolling hills and consists of 132 Vestas wind turbines.

To better support Rocky Mountain Power’s business goals and project objectives, we helped them understand the benefit of having the same contractor for both the TB Flats I & II Wind Project as well as the Ekola Flats Wind Project, which was 20 miles away. Because they selected us to build both projects concurrently, we were able to hit the ground running and get them operational more efficiently.

The scope of work for both projects included public road improvements, access roads, foundations, collection system, transmission line, substation, operations and maintenance building, met towers, turbine erection and wiring. At the peak of construction, 200-250 were employed at each site. Mortenson self-performed all foundation, collection, turbine erection and substation construction. By self-performing these scopes, we were able to deliver more certainty to Rocky Mountain Power through safety leadership, creative solutions, schedule efficiency, cost savings and superior quality.

The 44 square miles of TB Flats I & II is made up of 104 Vestas V136-4.3 turbines and 28 Vestas V110-2 MW turbines, totaling just over 500 MW of clean energy. The Ekola Flats Wind Project spans 29 square miles and consists of 10 GE and 53 Vestas turbines totaling 250 MW. Erection at TB Flats I & II began in April 2020 and Ekola Flats started in June 2020. TB Flats was completed mid-year 2021 and Ekola was completed at the close of 2020, bringing 753.2 MW to the state.