In total, we identify 444 unique Climate-Fuel-I/M combinations. For each combination, representative counties are selected based on county population data sourced from the 2020 Census (U.S. Census Bureau, 2021). For combinations encompassing only one or two counties, all counties are included. For combinations spanning more than two counties, the selection criteria involve identifying the county with the largest population and the county closest to the 25th percentile in population size. This approach aims to capture a spectrum of urbanization levels within each Climate-Fuel-I/M combination. The county with the largest population represents the most urban, while the county closest to the 25th percentile represents a more rural context within the same Climate-Fuel-I/M grouping. In total, we identify 701 unique countymonth combinations based on these Climate-Fuel-I/M scenarios, encompassing counties from 479 unique counties across the U.S. This selection represents approximately 15.2% of all U.S.