Within most developed economies, the general blueprint for reducing greenhouse gas emissions involves decarbonizing the electric sector, followed by significant transitions to electricity within the transportation, commercial, and residential sectors. Recent trends summarized in Figure 1 reveal how early in this process the United States is. Overall US greenhouse gas (GHG) emis-sions declined from 5,631 mmTons in 2010 to 5,298 in 2018 despite a decade of economic growth. However, this drop of 333 mmTons reflectd a nearly 500 mmTon/year decline in the electric sector partially offset by increases in all other major sectors, including the residential (958 to 1,007) and transportation (1,874 to 1,935) sectors.