The Deji Reservoir is located on the upper reaches of Dajia River in Heping District, Taichung City, with steep slopes and many passes. At the end of the Japanese occupation, the Governor-General in Taiwan planned the development of the Dajia River. The plan was to build a weir in the upper reaches of Dajia River to store water for generating electricity, agricultural irrigation and industrial water use. However, the plan was interrupted due to the defeat of Japan. In the post-war period, the Nationalist Government followed the plan of the Governor-General, and the power development plan was still based in Dajian, with six power plants including Dajian, Qingshan, Guguan, Tianlun, Maan, and Shigang. In 1973, Deji Dam started to store water, forming a big lake in the shape of a goose egg. In the following year, the plant officially generated electricity.
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