With a progressing energy transition, there will be a growing number of distributed energy resources in the distribution grid. These can be on the one hand renewable power plants like wind turbines and photovoltaic systems and on the other hand electric consumers, such as electric vehicles and heat pumps. As a result of this process, there is a huge need for grid enhancements in order to avoid technical problems. In distribution grids, the major problems expected are capacity congestions in electrical lines and transformers as well as overvoltages in some nodes of the grid. (see e.g. [1]) Today’s approach of grid enhancement up to the last kilowatt power is economically inefficient and time-and resource-consuming. Against the background of this soon-to-be situation, a number of practitioners and researchers proposed regional flexibility markets in order to use them in a grid supporting way (e.g. [1], [2], [3], [4], [5]). Flexibility, in this context, can be an electrical producer, consumer or storage that is able to adapt certain technical parameters (e.g., electrical power) in response to a critical grid condition. Although the concept of these so called ‘regional flexibility markets’ has been discussed much, there still exists no operational market according to the original idea. The article at hand aims to describe a possible market design of a regional flexibility market. Such a market shall enable distribution system operators (DSO) to procure grid supporting flexibilities and therefore reduce operational cost in the short term and grid enhancement in the long term. For potential suppliers of flexibility, this market is an alternative to the established energy exchange trading and the balancing energy market.
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