Minamiaiki Dam

{{Short description|Dam in Minamiaiki, Japan}}

{{Infobox dam

|name = Minamiaiki Dam

|image = Minamiaiki Dam.jpg

|image_caption =

|name_official =

|dam_crosses =

|res_name =

|location = Minamiaiki, Nagano National Forest

|dam_length = 444 m

|dam_height = 136 m

|dam_width_base =

|construction_began = 1995

|opening = 2005

|cost =

|res_capacity_total = 19,170,000 m³

|res_catchment = 6.2 km²

|res_surface =

| coordinates = {{coord|36|00|16|N|138|39|13|E|type:landmark|display=inline,title}}

| extra =

}}

The Minamiaiki Dam is a rock-fill embankment dam on the Minamiaiki River in Minamiaiki, Nagano Prefecture, Japan. Together with the Ueno Dam, it provides water for the Kannagawa Hydropower Plant owned by the Tokyo Electric Power Company. The Minamiaiki dam is the higher of the two dams. When completed, the station will have the largest power output of any pump-storage power plant in the world at around 2.82 GW.{{cite web|url=http://www.tepco.co.jp/en/press/corp-com/release/05122201-e.html |title=Commencement of Commercial Operation of Unit 1 of Kannagawa Hydropower Plant- Pumped-Storage Power Plant with World's Largest Capacity |publisher=Tokyo Electric Power Company |date=December 22, 2005 |accessdate=January 30, 2010 |archiveurl=https://web.archive.org/web/20110319182218/http://www.tepco.co.jp/en/press/corp-com/release/05122201-e.html |archivedate=March 19, 2011 |url-status=dead }} Since 2005, Unit 1, with an installed capacity of 470 MW, is in commercial operation.{{Cite web |url=http://www.powermag.com/issues/cover_stories/Kannagawa-Hydropower-Plant-Japan_461.html |title=Power - Kannagawa Hydropower Plant, Japan |access-date=2010-08-09 |archive-date=2010-03-10 |archive-url=https://web.archive.org/web/20100310133204/http://www.powermag.com/issues/cover_stories/Kannagawa-Hydropower-Plant-Japan_461.html |url-status=dead }} Commercial operation of Unit 2 is planned in 2012, commercial operation of all six units as late as 2020.[http://www.tepco.co.jp/en/corpinfo/ir/tool/annual/pdf/ar2010-e.pdf TEPCO 2009 Annual Report]