Store-and-Forward Energy Grid (SAFEr Grid)

A New Architecture For Power Grids

Worldwide, the transition toward low‑carbon, inverter‑dominated power systems with low physical inertia is pushing traditional grid operation to its limits: while the overall setting has changed, the underlying working principles—defined more than 125 years ago—have not. In particular, the massive integration of inverter‑based resources poses a grand challenge to power system stability, with severe blackouts already occurring in developed countries. The traditional global synchronous frequency paradigm is increasingly turning from an asset into a liability, as tight system‑wide synchronism allows local disturbances and events to propagate rapidly across the grid and potentially trigger large‑scale blackouts.

Against this background, the ERC‑funded Synergy Grant project SAFEr Grid proposes a disruptive alternative: replacing synchronous power balancing with an asynchronous, energy‑based coordination paradigm. The core idea is to compartmentalize large power systems into autonomous yet interoperable subgrids that operate independently and exchange energy through a store‑and‑forward energy routing logic, conceptually inspired by data routing in the Internet. By decoupling subgrids and eliminating the requirement for system‑wide synchronism, SAFEr Grid introduces a fundamentally new mechanism for power system organization, control, stability, and resilience. Using smart power‑electronics devices, so‑called energy routers, traditional global power balancing is replaced by local energy balancing, resulting in an inherently modular and scalable grid infrastructure across clearly defined interfaces.

The project aims to develop the theoretical foundations, architectural principles, and operational framework for this new grid paradigm. The mission is to deliver a blueprint system architecture capable of supporting a fully carbon‑neutral, highly volatile, and distributed energy landscape. Crucially, the envisioned architecture is incrementally deployable and designed to leverage and reuse existing grid infrastructure and components.

In this context, the SAFEr Grid team seeks to create an innovative, layered architecture for power systems that goes far beyond the current state of the art by exploring the coupling of asynchronous subgrids using a store‑and‑forward principle for energy. Inspired by the successful architecture of the Internet and its well‑established features and protocols, the four Principal Investigators Antonello Monti, Frede Blaabjerg, Klaus Wehrle, and Frank Piller, together with their groups, contribute their expertise in power system automation and control, power electronics, cyber‑physical system theory, communication systems, and innovation management. All proposed concepts will be validated through lab‑scale demonstrations and hardware‑in‑the‑loop experiments with real energy‑router prototypes to ensure practical feasibility and readiness for real‑world deployment.

Key Enablers

Smart Power Electronics

High-frequency, programmable power electronic converters are the physical core of the envisioned energy router devices that decouple a-grids and enable bidirectional AC–DC–AC and/or DC–DC conversion across arbitrary voltages and frequencies. Also known as smart transformers, they allow store-and-forward energy routing, turning passive power flows into controllable energy streams.

Energy Buffers and Storage

The rollout and increasing availability of stationary battery storage systems and other multi-energy-carrier storage provide the energy buffers needed to perform store-and-forward energy routing and to smooth intermittency by decoupling energy production and consumption in time. This is formalized via the so-called AFSC priorities (Aggregate–Forward–Store–Convert), where energy buffers and storage is only used when local balancing and forwarding are infeasible.

Fast and Reliable Communication

A dedicated cyber layer leverages fast and reliable communication solutions for exchanging energy commands, status information, and flexibility offers between a-grids and energy routers. This digital nervous system can replace global frequency as the dominant coordination signal and enables asynchronous, event-driven routing and balancing of energy among a-grids.

Asynchronous Power System Dynamics Theory

New modelling and stability frameworks are required that do not assume global frequency synchronism. This includes Lyapunov-based stability analysis, impedance and harmonic methods, action energy, and energy-shaping port-Hamiltonian models that describe physical systems in terms of energy storage, dissipation, and exchange. These approaches underpin the design and verification of store-and-forward energy routing between a-grids under realistic scenarios and assumptions.

Cyber–physical Systems Theory and Modeling

The consideration of asynchronous power grids as a cyber–physical system of systems requires new theoretical and modeling frameworks that integrate the coupling of continuous power dynamics with discrete communication/control events. Cyber–physical systems theory is thus essential for designing coordination mechanisms that can reliably route energy between a-grids while guaranteeing stability and resilience to faults and critical events.

Internet-inspired Abstraction Principles

Internet-inspired abstraction principles, i.e., a layered architecture separating a-grid physics, energy routing, energy streaming, and applications, allows asynchronous power systems to scale while keeping the core simple and stable. This separation lets technologies and applications evolve independently over time without repeatedly redesigning the core energy routing and balancing mechanisms.

SAFEr Grid Idea & Concept

Library

SAFEr Grid Interview with the Principal Investigators
Press Release 05.11.2024

In this interview, the Principal Investigators explain their vision on project SAFEr Grid.

SAFEr Grid EU CORDIS Website
Project Information 01.04.2025

Grant agreement ID: 101166783
DOI: 10.3030/101166783

SAFEr Grid Perspective Paper
PDF 20.01.2026

S. Schwarz et al., Resilient low-inertia power systems through asynchronous energy balancing, Nature Reviews Electrical Engineering, vol. 3, pp. 101–110, 2026.

DOI: 10.1038/s44287-025-00256-5

Principal Investigators & Host Institutions



News

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SAFEr Grid Project on LinkedIn