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AKE: Arbeitskreis Energie

AKE 7: Renewable Energy: Aspects of Intermittent Generation

AKE 7.2: Hauptvortrag

Dienstag, 28. März 2017, 10:00–10:30, S Aula

Surplus electricity and storage under conditions of intermittent supply — •Friedrich Wagner — Max Planck Institut für Plasmaphysik, Greifswald, Germany

Data from the German electricity system for the years 2010, 2012, 2013, and 2015 are used and scaled up to a 100% supply by intermittent renewable energy sources (iRES). In the average, 330 GW wind and PV power are required to meet a 100% target. A back-up system is necessary with the power of 89% of peak load. Surplus electricity accrues at high power levels. Curtailing surplus power to a large extent is found to be uneconomic. Demand-side-management will suffer from the strong day-to-day variation of available surplus energy. A day storage is ineffective because of the day-night correlation of surplus power during winter. A seasonal storage loses its character when transformation losses are considered because it can contribute only after periods with excessive surplus production. The capacities to be installed stress the difficulty to base heat supply and mobility also on iRES generated electricity in the future. As the German energy transition replaces one CO2-free electricity supply system by another one no major reduction in CO2 emission can be expected till the last nuclear reactor will be switched off. The German GHG emission targets for 2020 and beyond may be in jeopardy.