The present work deals with the formation of power generation by hydroelectric power in the first half of the 20th Century in Upper Styria. Subject of the investigation is the power plant Mötschlach - St. Dionysen, that despite concrete plans could not be established over a period of almost 40 years.On the basis of this power plant, the political, economic, topographical and technical aspects concerning the construction of hydroelectric power plants will be investigated and the factors that were an obstacleto the construction of the power plant over several decades, are worked out. After decades of growth in the industrial region of Upper Styria several hydropower plants have be enbuilt at the beginning of the 20th Century. Municipalities and industrial companies were able to cover their demand for electricity still with these first plants be fore the first world war, but the war meant a supply problem for them et alworking industry. For the company Gebr. Böhler & Co. in Kapfenberg, neither the availability of cheap coal nordirect access to free sloped istancesto a sufficiently large river was given to generate electricity, which is why it was decided to build a power plant in a - in terms of technical possibilities - far distant location. After the first World War, when labor force was available in sufficient quantities, the implementation of the power plant plans failed because of the funding and not given electricity demandand led to a sale of land on the river Mur to a public power company.Only after the "Anschluss" of Austria by Nazi Germany an extension of the Upper Styrian industry began and the power supply could not keep pace, the idea of the power plant has been revived due to lack of alternatives. The construction of the power plant was finally financed through State resources and the massive use of forced labor.The power plant, completed in 1944, deliver s hydroelectricity up today. The development described in this work is sort of then ever told prologue to the success story of Austrian hydroelectric power.