Japan's Hokkaido Electric shut its 600 MW No. 2 coal-fired unit at the Tomato-atsuma power plant unexpectedly at 18:55 local time (09:55 GMT) on June 11 around the time when a major earthquake rocked nearby offshore Urakawa. In a June 11 updated filing to the Hatsuden Joho Kokai System, Hokkaido Electric said the shutdown was triggered by the earthquake. The company added it plans to restart the plant on June 11. A magnitude 6.2 earthquake rocked nearby offshore Urakawa at 18:55, according to the Japan Meteorological Agency. On June 9, Japan decided to undertake voluntary electricity savings in the Tokyo area over July-August amid a severe summer supply and demand outlook. The Tokyo area's reserve power supply capacity ratio is expected to be only 3.1% in July due to extended repair works at some power plants.