![]() ![]() its Montana general office is located in Butte. The company is headquartered in Sioux Falls, S.D. NWE is an electric and natural gas utility that serves approximately 656,000 customers in the western two-thirds of Montana, eastern South Dakota, and central Nebraska. Also shown is the 500,000-gallon raw water storage tank on the right and the 500,000-gallon demineralized water storage tank on the left. NorthWestern Energy’s Dave Gates Generating Station consists of three Pratt & Whitney Power Systems 50-MW Swiftpacs. It is located at Mill Creek, near Anaconda, Mont., northwest of Butte.ġ. The 150-MW natural gas–fired plant-which was renamed in March 2011 in honor of the late Dave Gates, NWE’s vice president of wholesale operations-began commercial service on Janu(Figure 1). The $185 million plant-purportedly the first built specifically for electrical transmission grid regulation duty-has increased grid reliability, provides a rapid ramp rate resource, and can operate at low loads, which minimizes fuel costs. NorthWestern Energy’s (NWE’s) Dave Gates Generating Station (DGGS), formerly the Mill Creek Generating Station, was constructed as a “regulating reserve” plant to provide highly flexible reserve capacity for a grid with increasing nondispatchable renewable energy sources. For NorthWestern Energy, the best solution was adding fast-acting gas-fired generation to its Montana electricity grid to meet required reliability standards while replacing expensive third-party contracts for ancillary services. ![]() Stable grid operation is challenging, especially when intermittent and unpredictable renewable generation is added to the generation mix.
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