TransnetBW and Octopus Energy Successfully Pilot EV-Driven Grid Stabilization
In a significant step toward decentralized energy management, TransnetBW and Octopus Energy announced on March 25, 2026, the successful completion of the “OctoFlexBW” pilot project. The initiative demonstrated that electric vehicles (EVs) from private households can be effectively integrated into grid redispatch operations to mitigate network congestion and enhance overall stability.
The project successfully established all necessary digital and energy-economic compliant processes to leverage the flexibility of more than 700 electric vehicles. By utilizing this fleet, the partners achieved a daily call volume of 2 MWh. This proof-of-concept highlights a scalable model for grid management; the companies noted that scaling this capacity to one million electric vehicles would result in an available capacity of 3 GWh per day.
This development arrives as the electrification of transport sees renewed momentum. In 2025, EV registration numbers climbed by 43.2% compared to the previous year, with electric vehicles accounting for 19.1% of total registrations. This growth increases the “inherent potential” for decentralized flexibility, making EVs stabilizing the grid a viable market-based solution for congestion management.
The successful trial underscores the growing importance of smart charging stations and the implementation of smart charging management to reduce costs for users while supporting the energy transition. While many consumers focus on saving on home charging, the OctoFlexBW project illustrates the broader economic potential of bidirectional energy flows, aligning with recent V2G testing in Germany.
The project’s findings are expected to drive a shift in how grid flexibility is procured. Dr. Oliver Strangfeld, member of the Management Board of TransnetBW, stated that the integration of private EVs has shown that the market-based solution for network congestion management “works flawlessly and is ready for market ramp-up.”
According to TransnetBW, the next strategic phase involves expanding the current cost-based redispatch regime to include a market-based component, referred to as “Redispatch 3.0,” specifically designed for decentralized flexibility. This transition highlights the industry’s move toward more dynamic, market-driven mechanisms for maintaining grid stability in an era of increasing EV adoption.
