In December 2018, the Austrian Council of Ministers - based on the EU's "Clean Energy Package" (Art. 22 of Directive 2018/2001 "RED II") - decided to draft the "Renewable Energies Act 2020". The package of measures includes, among other things, the expansion of the energy communities beyond property boundaries.
The project - a dynamic simulation of such a Local Energy Community (LEC) commissioned by the Energy Institute Vorarlberg - is intended to map energy flows for a realistic composition of participants in a time resolution of ¼ h.
Real and standardized load profiles of various consumers (e.g. a dairy, a bakery, and households) as well as measurement time series for distributed PV systems as generators were used for the simulation. The simulation considers the total electricity demand of the community and the self-consumption of the buildings with PV systems, as well as a possible grid feed-in of the PV generation in case of surplus. The resulting electricity demand must be covered at each time step by grid supply or LEC trading.
The results show that with a realistic distribution of participants (PV self-consumption share of more than 50%) a power distribution within the LEC of less than 10% is given. This configuration of existing PV systems with a high share of self-consumption is - measured in terms of billing costs - currently not profitable from an economic point of view.
Dynamic balancing has shown the importance of organizational details such as the allocation key of feed in or grid demand and correct accounting. By gaining this competence, we can contribute to the future design of "Local Energy Communities" in which both energy and economic efficiency are given.
- DI (FH) Gerhard Huber, Head of the project at RC Energy -
Prof. (FH) Dr.-Ing. Markus Preißinger
illwerke vkw Endowed Professorship for Energy Efficiency, Head of the Research, Head of the Research Center Energy
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