December 1957 The Ibi River was selected for study by the
Electric Power Development Company at the 23rd Electric Power
Development Coordinating Meeting
May 1976 The Ministry of Construction releases the bulletin
"Policy on Tokuyama Dam Construction Project"
December 1982 Project incorporated into Electric Power
Development Basic Plan at the 90th Electric Power Development
Coordinating Meeting 400 MW pumped storage plan
May 2000 Construction on main part started
May 2004 Plan for electrical output changed from 400 MW of
pumped-storage hydropower to start in 2008, to 153 MW of
conventional hydropower to start in 2014
September 2006 Experimental filling of the reservoir behind the
Tokuyama Dam began
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