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California's imports were the largest in the United States last year when 25 percent of California's total electricity supply was imported, the Energy Information Administration (EIA) said on Monday.
Last year, California's net electricity imports were the largest in the country at 70.8 million megawatt-hours (MWh), followed by Ohio, Massachusetts, Virginia, and Tennessee, EIA data showed.
In California's case, the state's utilities partly own and import power from several power plants in Arizona and Utah. California's electricity imports also include hydroelectric power from the Pacific Northwest, mostly across high-voltage transmission lines from Oregon to the Los Angeles area.
This summer, amid the great West heatwave, the largest U.S. solar state, California, was grappling with power issues and struggling to keep its electricity grid stable as demand exceeds supply.
California energy consumers were warned of rolling outages as there was insufficient energy to meet the high demand during the heatwave in August. In California, where solar power supplies more than 20 percent of electricity as per the Solar Energy Industries Association (SEIA), August's rolling outages were the worst such outages since the 2000-2001 energy crisis in the state.
According to 2019 data from the California Energy Commission, the state imported 30.68 percent of its renewables-generated electricity supply and 69.32 percent of non-renewables supply.
While California was the biggest net importer of electricity in the U.S. last year, the largest net exporter of electricity was Pennsylvania, with 70.5 million MWh of exports, or 24 percent of total supply, EIA data showed.
Pennsylvania's electricity generation was the third-largest in the United States in 2019, behind Texas and Florida. Natural gas-fired and nuclear power plants produced most of Pennsylvania's electricity generation in 2019, at 43 percent and 36 percent, respectively. Pennsylvania ranks second in the U.S., after Illinois, in terms of nuclear power generating capacity.
By Charles Kennedy for Oilprice.com
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Charles is a writer for Oilprice.com