Stoen Operator and ZPUE are implementing a project in Warsaw that pushes the boundaries of the use of energy storage in the Polish electricity infrastructure. Instead of isolated test installations, ten battery-based units integrated directly into medium- and low-voltage (MV/nn) substations are appearing in the capital’s distribution network. This initiative is not just an experiment, but an operational response to the specific challenges of a large agglomeration: dense housing, surging power demand and the dynamic development of RES micro-installations. In this system, the storages take on the role of active voltage stabilisers, becoming an integral part of the daily operation of the system.
This implementation sheds new light on the evolving role of distribution system operators (DSOs). The shift from passive energy transmission to active management of energy resources is now becoming a business necessity and not just a technological curiosity. The example of Warsaw shows that energy storage is no longer seen as a costly addition to the infrastructure and is starting to be treated as one of the foundations of modern distribution. A key lesson from the Warsaw project is that, in an urban setting, the success of an investment depends not on battery performance alone, but on deep system integration and the ability to operate in different load scenarios.
It is worth noting several aspects that may determine the effectiveness of similar projects in the future. It seems sensible to move away from point-based design to thinking about the full life cycle of an installation. Taking into account the costs of operation, service and emergency behaviour of the system as early as the planning stage makes it possible to avoid costly adjustments later.
It is also worth considering closer collaboration between technology providers and operators to develop standards that will facilitate the scaling of solutions in other regions of the country. Rather than waiting for a final regulatory settlement, the market has the most to gain from gathering and sharing operational experience. It is this practical data, gained from working in a living urban organism, that is today’s most valuable asset for energy companies planning long-term investments in network flexibility.
