Tambara Dam

Tambara Dam is an embankment dam with a pumped-storage power station located in Numata, Gunma Prefecture. The facility moves water between an upper and lower reservoir to generate electricity through reversible turbines.

Construction began in 1973 and the dam was completed in 1981, with the power station becoming operational five years later. The project was developed as Japan expanded its hydroelectric infrastructure during the 1970s and 1980s.

The facility represents Japan's commitment to sustainable energy solutions, providing power generation while maintaining environmental balance in the Gunma Prefecture region.

The power station is located in a mountainous region of Gunma Prefecture, accessible from Numata. Visitors should know this is an active industrial facility that may not be open for general public access.

The facility uses reversible Francis turbines that serve both for power generation and for pumping water uphill. This design allows the power station to respond quickly to changes in electricity demand by switching between generation and pumping modes.

Location: Numata

Inception: 1981

Website: https://tepco.co.jp/rp/business/hydroelectric_power/mechanism/dam/list/tanbara.html

GPS coordinates: 36.77470,139.06300

Latest update: December 10, 2025 20:08