TransnetBW and Tesla test home storage for grid stabilization

»Powerwall« home storage systems from U.S.-based mobility and energy company Tesla are serving as the basis for the »PV Shift« project of transmission system operator TransnetBW, which is part of German energy group EnBW. In an initial six-month field trial, Tesla will act as an »aggregator« and interface to an unnamed number of home storage operators, according to a TransnetBW statement. This will give TransnetBW access to the systems in order to use their available reserves to stabilize the grid.
With this trial, the company wants to »gather experience on the availability and predictability of flexibility potential« and then incorporate this into a standardized mechanism for »Redispatch 3.0«. In redispatch, generation potential is used – at high prices – on the instructions of the transmission system operators to avoid grid bottlenecks. At present, these are still mostly fossil-fuel power plants. TransNetBW already had the economic potential for the use of decentralized flexibilities for redispatch investigated by the University of Stuttgart last year and comes up with figures »in the three-digit million euro range« for its area of responsibility Baden-Württemberg alone.
The so-called »Redispatch 2.0«, which has been in force in Germany since 2021, has already considerably expanded the group of participants in the mechanism. For example, renewable energy plants with a capacity of 100 kilowatts or more will be subject to redispatch if required. In addition, in several countries, balancing energy is already being provided by interconnected home storage systems. The use of home storage systems for redispatch is also already being tested, for example in a project of the transmission system operator TenneT with the IT group IBM and the storage and energy service provider Sonnen.

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