Built in 1911, this is the oldest electric plant built on the banks of the Kiso River. It was given the title of a modern National Treasure. It also serves as a good example of the history of the development of hydro electric power in Japan. The archive display shows many interesting daily life & cultural exhibits from the 18th as well as the beginning of the 19th century. Opening Days & Hours: 9:30‐16:00 Tuesday to Sunday closed on Mondays Entrance till 15:30. Admittance Fees: Children \110, Adults \320 Groups (above 30) Children \50, Adults \210 Combined discount ticket for The Sugihara Memorial Hall & The Power Plant Museum: Children \100, Adults \420