Rainbow Dam is a 60MW hydro power project. It is located on Missouri river/basin in Montana, the US. The project is currently active. It has been developed in single phase. Post completion of construction, the project got commissioned in 1910.

Project Type Total Capacity (MW) Active Capacity (MW) Pipeline Capacity (MW) Project Status Project Location Project Developer
Hydropower 60 60 Active Montana, the US PPL Montana


The project was developed by PPL Montana and is currently owned by NorthWestern with a stake of 100%.

Rainbow Dam is a run-of-river project. The total number of penstocks, pipes or long channels that carry water down from the hydroelectric reservoir to the turbines inside the actual power station, are 1 in number. The penstock diameter is 7.62m. Rainbow Dam underwent through rehabilitation & modernization during 2009-2013.

Development Status

The project got commissioned in 1910.

Contractors Involved

Andritz Hydro was selected as the turbine supplier for the hydro power project. The company provided 1 unit of kaplan turbine with 62MW nameplate capacity.

Andritz Hydro supplied 1 electric generator for the project.

About PPL Montana

PPL Montana LLC (PPL Montana), a subsidiary of PPL Corporation is a power generation company that generates electricity at its coal-fired and hydroelectric power plants. The company operates generating facilities with a combined capacity of more than 2,200 megawatts. It generates power at two coal-fired generating plants such as the J.E. Corette facility near Billings and the Colstrip facility for nearly 2,250 megawatts of capacity. The company owns and operates various hydroelectric stations in Missouri, Flathead, Clark Fork and Madison rivers and Rosebud Creek. PPL Montana is headquartered in Billings, Montana, the US.


All power projects included in this report are drawn from GlobalData’s Power Intelligence Center. The information regarding the project parameters is sourced through secondary information sources such as electric utilities, equipment manufacturers, developers, project proponent’s – news, deals and financial reporting, regulatory body, associations, government planning reports and publications. Wherever needed the information is further validated through primary from various stakeholders across the power value chain and professionals from leading players within the power sector.