This Master Thesis raises the question, which storage capacity is needed for different scenarios to reach Electricity Autarky 2050 in Austria. The resulting objectives for the paper are to calculate storage demand on daily, monthly and yearly level, taking into account the typical supply curve of solar electricity. Furthermore, additional demand for hydro and other storages is assessed. Pumped Hydroelectric Storage, Compressed Air Energy Storage and Hydrogen Storage are discussed by explaining their technology and comparing usual parameters. The main part of this paper compares derived values for electricity demand and supply for 2050 in two different scenarios, in order to finally calculate demand for energy storage in detail. Findings show that the demand for energy storage amounts to 5.3 TWh per year in the Constant scenario and 7.2 TWh in the Growth scenario. During summer months (from April until September) electricity is fed into the storage and discharged during winter months (from October until March), whereas daily storage demand shifts from midday to morning and evening hours, as the increased share of solar electricity produces more electricity for the high demand during midday. The current storages in Austria provide 1.9 TWh electricity and are, therefore, insufficient to conserve enough electricity from summer to winter months. It can be concluded that for 100 % electricity from renewable energy carriers a long-term, a comprehensive concept for oad management and load shifting is necessary, not only including Pumped Hydroelectric Energy Storage, but also other storage technologies like CAES and Hydrogen. With an increased share of electricity from REN, further development in the following areas can be attaint: a strong electricity grid in Europe, Smart Grids that are able to converge demand and supply, and increasing diffusion of small storage units.