16525 Shumarinaiko was discovered by K. Endate and K. Watanabe at the Kitami Observatory on February 14, 1991 and named it after Lake Shumaranai, a scenic, former hydroelectricity generating lake in northern northern Hokkaid.
16525 Shumarinaiko, provisional designation 1991 CU2, is a stony Nysian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 14 February 1991, by Japanese astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on the island of Hokkaido in northern Japan. The asteroid was named after the Japanese Lake Shumarinai. Shumarinai Prefectural Natural Park (, Shumarinai doritsu shizen koen) is a Prefectural Natural Park in northern Hokkaido, Japan. Lake Shumarinai was created artificially in 1943, after which asteroid 16525 Shumarinaiko was named. Hokkaido, Japan The five largest operational pumped-storage plants are listed below (for a detailed list see List of pumped-storage hydroelectric power stations): Okutataragi Pumped Storage Power Station Japan Hydroelectricity is the second most important renewable energy source after solar energy in Japan with an installed capacity of 50008 MW as of 2019. Which makes Japan one of the largest hydroelectricity producers in the world. According to the International Hydropower Association Japan is the world's sixth largest producer of hydroelectricity in 2020. Most of Japanese hydroelectric power plants are pumped-storage plants. 
