The vast majority of the electricity used in the City of Idaho Falls in the 2017 fiscal year was hydropower.
The City's five hydropower plants generated almost a quarter of the energy used in the City, while the Bonneville Power Administration (BPA) provided a significant portion of the balance. BPA markets electricity generated at 31 hydropower plants in the Columbia River Basin and one nuclear plant in Washington state.
IFP has a power purchase agreement with Utah Associated Municipal Power Systems (UAMPS) for 5.26 percent of the output of the Horse Butte Wind Project, a 32-turbine facility located east of Idaho Falls, and the utility generates a small amount of solar through two arrays at its headquarters - a fixed array consisting of 114 PV panels that's capable of generating 23.3 kilowatts, and a tracking array with a 1.6 kW capacity.
The market purchases consist largely of fossil fuels - coal and natural gas - purchased through UAMPS.