Provision of system flexibilities from e-vehicles for various end user applications


According to the International Energy Agency Outlook for electric vehicles (EVs), controlled EV charging is well suited to contribute to increased flexibility in power systems. Many features that provide benefits to the energy system can be implemented on account of the vehicle-to-grid (V2G) approach, for instance minimizing impacts on load profiles or shifting demand across time periods. V2G-technologies have been around for a reasonable long time and their applications are well researched at theoretical and small-scale implementation level. However, there is less experience in issues such as acceptance and economic benefits for end users as well as scaling up and determining the impact of an integrated energy system. Especially the application of V2G strategies in modern mobility concepts such as car sharing has not yet been tested in the long term.

On that account, the flagship project Car2Flex shows in three different use cases (sharing, fleet, individual) to what extent the increasing share of e-mobility for different mobility needs of private individuals and companies can be integrated into a holistic systemic approach. Therein, bidirectional DC charging points (e.g., for direct use of PV generation), control algorithms for system-friendly charging strategies (e.g., grid, energy, self-consumption, energy trading) as well as the integration of aggregator and booking platforms are developed. These technological developments are accompanied all along the project by a participation between the users and relevant stakeholders (e.g., building developers, charging station operators).

The findings from the demonstration are supplemented by a large-scale analysis regarding the expansion of grids and renewable energy, sustainability assessments and recommendations for regulation as well as standardization and interoperability.

The Car2Flex concept aims to create new economic incentives for the e-mobility sector (e.g., PV self-consumption or direct marketing of wind energy), thus supporting the increasing integration of renewable energy sources. Based upon technological development in Car2Flex, batteries in electric vehicles can be accessed in terms of their flexibility potential and are made available to potential users (e.g., grid operators, energy suppliers). Thanks to advancing digitalization, consumption patterns in e-mobility utilization can be better detected and the usage of flexibility potentials can be facilitated. Consequently, customer-oriented solutions for e-mobility utilization can be developed directly with users in the different use cases. The Car2Flex concept can enable new services, especially for the defined target group of building developers, private individuals / e-vehicle users, car sharing- and fleet operators.

Short description of project tasks by EVT:
Within the scope of the Car2Flex project, the Chair of Energy Network Technology evaluates the potential of different e-mobility use cases for providing flexibility to the power system. Realistic mobility- and charging patterns of use case “Sharing”, “Fleet” and “Private/Individual” are estimated. The EVT is responsible for the coordination and organization of numerous real-life demonstrations. Additionally, the EVT helps developing technical concepts of demo cases. Based on time-resolved grid simulations, the EVT analyses the impacts of the provision of EVs’ flexibilities on the power system.

Operating time: 01.01.2021 – 31.12.2024




This project is funded by the climate- and energy fund and operates in the context of the FTI-initiative „Vorzeigeregion Energie“.


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