The map depicts Solar Generation Regions of California, which are regions with concentrations of operating commercial solar plants. The regions were delineated using a k-means method that groups the plants into discreet regions based on their latitude, longitude and distance to the coast. After facilities were grouped, the outermost facilities in each region were connected to create the boundaries for each region. To include all facilities inside each polygon, a 5 km cartographic buffer was used. Plants that are farther from a concentration of other plants are not included. Areas outside California included in the regions are the result of the mapping process and do not represent solar generation facilities. Based on the Quarterly Fuel and Energy Report dataset, this map focuses on plants of commercial scale (at least 1 MW capacity). For more information please contact John Hingtgen at john.hingtgen@energy.ca .gov. October 2022