Climate change affects both energy demand and supply through various parameters. These parameters include warmer air and water caused by higher temperatures, changes in the flow of rivers, snowfall and ice accretion, coastal inundation, wildfires, soil conditions, cloudiness, and wind speeds. Increases in energy demand and supply loss create a combined problem for ensuring an adequate supply of fuels and electricity. Projections of these parameters, combined with those of energy demand and supply over the next century, are needed to improve our understanding of the increased vulnerability of the energy sector.