The data displayed in the All Utilities, Net Metering graphs includes data about NorthWestern Energy net metering systems installed between 2000 and 2015. See the NorthWestern Energy About the Data page for more details.
Net metering data for Mission Valley Power was provided by the utility in August 2014.
Net metering data for the remaining utilities was collected from testimony submitted by the Montana Electric Cooperative Association and Montana Dakota Utilities to the Montana Energy & Telecommunications Interim Committee in September 2015.
Utility customer data was collected from the U.S. Energy Information Administration, form EIA-826.