[en] In 2007 a magnitude 6.8 earthquake unexpectedly occurred offshore Chuetsu about 16 km away from the Kashiwazaki-Kariwa nuclear power plants. Units 2, 3 4 and 7, which were in operation, automatically shutdown and Units 1, 5 and 6 were in the shutdown mode. The assessment of impacts of the earthquake on the Kashiwazaki-Kariwa NPPs is required before they resume operation, which is not expected for some time, so as to recover the public trust. Loss of the Kashiwazaki-Kariwa capacity (8212Mwe) - nearly 5-6% of total amount of power generation in Japan- has an impact in international energy market. This article outlined the state of the earthquake and its impacts on the Kashiwazaki-Kariwa NPPs and then analyzed the effects of prolonged shutdown of Kashiwazaki-Kariwa NPPs on supply and demand of power generation and also international oil and gas market. Additional amount of exhausted carbon dioxide was assessed nearly 31-36 Mtons. (author)