On the other hand, in the Keihanshin metropolitan region, demand for electric power increased rapidly corresponding to economic growth and an increase in the population, and Kansai Electric Power Co., Inc. developed electric power resources in the Kiso-gawa River valley and in the Kurobe-gawa River valley, such as Kurobegawa No.4 Hydro Power Plant and the Kurobe Dam.
一方、京阪神都市圏では経済成長と人口増に伴って電力需要が増加、関西電力では木曽川流域や黒部川第四発電所及び黒部ダムといった黒部川流域での電源開発をおこなった。