As the energy transition accelerates, the contribution of inverters to grid stability becomes increasingly critical. Similar to traditional synchronous generators, grid-forming units, such as battery storage systems (BESS) or other converter based generators, can regulate voltage and frequency, as well as provide inertia—making them essential for maintaining grid stability.

Development of regulatory frameworks for grid-forming technology in Germany

A key milestone was reached in Germany in July 2024, when the technical regulator for power grids in Germany VDE FNN published the guideline “Technical Requirements for Grid-Forming Properties, Including the Provision of Instantaneous Reserve” (“Technische Anforderungen an Netzbildende Eigenschaften inklusive der Bereitstellung von Momentanreserve”). For the first time, Germany established harmonized requirements for grid-forming units, ensuring the stability and security of the power supply in an era of rapidly growing renewable energy.

While technical requirements were introduced with the VDE FNN guideline in 2024, the industry has been awaiting formal verification and certification processes. The final piece of the missing framework was published on 15 May 2025 with an updated version of the VDE FNN guideline. The new guideline for grid-forming properties (“VDE FNN Hinweis Netzbildende Eigenschaften”) establishes a clear framework and pathway for the certification and market approval of grid-forming units in Germany. By providing long-awaited clarity and detailed definition of compliance procedures, it paves the way for the widespread adoption of this essential technology for the energy transition.

The shift is coming: Why stakeholders should act now

The verification process formally qualifies plants for market procurement of inertia and enables them to receive remuneration for their stabilization services. With the regulatory framework in place, manufacturers can invest confidently in grid-forming technology, knowing that their solutions meet established requirements—removing previous uncertainties and risks. Companies that move now gain a competitive edge, fine-tuning their technology before the market saturates.

Energynautics – Your trusted partner in the grid-forming certification process

As the market leader in simulation models for certification in Germany, Energynautics specializes in supporting manufacturers through every stage of the verification process, ensuring seamless compliance with evolving certification standards:

• Creation of detailed simulation models
• Execution of pre-validation
• Preparation of compliance study
• Seamless integration of grid-forming properties verification into comprehensive modeling and simulation processes

By offering a single-source solution, Energynautics helps clients efficiently meet all regulatory requirements—facilitating a smooth certification process that supports the widespread deployment of grid-forming technology in the energy sector.

To contact our experts, please use the following email: gridforming@energynautics.com