Rainbow Dam is a 60MW hydro power project. It is located on Missouri river/basin in Montana, the US. According to GlobalData, who tracks and profiles over 170,000 power plants worldwide, the project is currently active. It has been developed in a single phase. Post completion of construction, the project got commissioned in 1910. Buy the profile here.


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.

For more details on Rainbow Dam, buy the profile here.

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.


GlobalData, the leading provider of industry intelligence, provided the underlying research used to produce this article.

This information is drawn from GlobalData’s Power Intelligence Center, which provides detailed profiles of over 170,000 active, planned and under construction power plants worldwide from announcement through to operation across all technologies and countries worldwide.