NorthWestern Energy has announced plans to upgrade its 8-MW Madison Powerhouse with the installation of four new turbine-generator units.

The turbines and generators in the Madison Powerhouse, on the Madison River about 10 miles north of Ennis, Mt., are 109 years old. The original powerhouse building will remain in place, largely unaltered, while four new units are installed within it. 

NorthWestern Energy says peak capacity of the powerhouse will be increased to 12 MW. The new turbines “will efficiently harness 95% of the power available from the water at the same flows used under the existing license, and that will result in almost 15,000 additional megawatt-hours for an

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