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In page Economy of North Korea:

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In 1997, coal accounted for more than 80% of primary energy consumption and hydro power more than 10%.[citation needed] Net imports of coal represented only about 3% of coal consumption. Hydroelectric power plants generated about 55% of North Korea's electricity and coal-fired thermal plants about 39% in 1997.[3][4] However, with only 20% of the per capita electricity generation of Japan, North Korea suffered from chronic supply shortages. Coal exports to China accounted for a major portion of North Korea's revenue in mid-2010s.[5]