It is widely known that the closure of conventional power plants in the course of the energy transition and the resulting decrease in operating reserve pose demanding challenges to transmission system operators (TSOs). They now have to compensate for this lost reserve to ensure stability of the transmission grid and secure the customer supply. In its search for new approaches, TSCNET shareholder TenneT, the Dutch-German TSO, has been cooperating for quite some time with the sonnen GmbH, a company specialising in home energy storage systems. Now a breakthrough has been announced: For the first time, sonnen provides operating reserves throughout Germany with its networked home storage systems.
This means that the currently largest virtual battery, which can compensate for grid fluctuations, goes into operation. This battery works in a unique way: It consists of thousands of individual electricity storage units, which are used for the own energy consumption of their respective households. If there are deviations in the power grid, these batteries automatically arrange themselves into a virtual large battery by means of artificial intelligence. Households are thus capable of performing the same compensation functions as conventional power plants and short-term deviations in the grid can be compensated very quickly. For this reason, sonnen, together with its technology partner tiko Energy Solutions, has been prequalified by TenneT to provide primary control reserve.
The prequalification of the virtual battery system for the primary control power market is subject to the strictest technical and safety requirements. Lex Hartman, Managing Director of TenneT, comments on the innovative technology: “That networked battery storages as virtual power plants are now able to stabilise the grid in the event of frequency deviations, is a further step on the road to increased system integration of renewable energies.”