In 2019, California’s electricity imports were the largest in the country at 70.8 million megawatt hours, representing 25 percent of the state’s total electricity supply, according to the Energy Information Administration (EIA).
California utilities partly own and import power from several power plants in Arizona and Utah. In addition, California’s electricity imports include hydroelectric power from the Pacific Northwest, largely across high-voltage transmission lines running from Oregon to the Los Angeles area.
The EIA also reported that Pennsylvania’s electricity generation was the third-largest in the nation, behind Texas and Florida. Pennsylvania’s electricity exports were the largest of any state in 2019, at 70.5 million megawatt hours, or 24 percent of the total supply.
Natural gas–fired and nuclear power plants produced the majority of Pennsylvania’s in-state electricity in 2019, at 43 percent and 36 percent, respectively. Pennsylvania rank
