IN Brief:
- TenneT has signed a capacity control contract with Green Energy Storage for the Sequoia battery project in Oosterhout.
- Sequoia is planned as a 200 MW / 800 MWh system and is intended to support congestion relief on the high-voltage grid.
- The project will receive priority under the Dutch ACM framework, with capacity also being released for other waiting users.
TenneT has signed a capacity control contract with Green Energy Storage for the Sequoia battery project in Oosterhout, North Brabant, marking the first congestion-relief project contracted under the Dutch regulator ACM’s prioritisation framework.
Sequoia is planned as a 200 MW / 800 MWh battery energy storage system and is scheduled to be energised in 2027. Environmental permits for the storage system and cable route are already irrevocable, and the high-voltage grid connection is under construction.
The project is intended to relieve pressure on the Dutch high-voltage network by storing electricity during periods of strong renewable generation and feeding it back during higher-demand periods. TenneT and Green Energy Storage said the battery will be used to make capacity available during scarcity, reduce peak loading, and use transport capacity more efficiently on a congested grid.
Under the ACM framework, the project will receive priority on the grid connection waiting list, with the arrangement also designed to release capacity for other users currently waiting for access. That gives Sequoia a more direct congestion-management role than a conventional merchant battery project.
The agreement comes as Dutch network operators face mounting pressure from renewable growth and electrification, with storage taking on a more formal function in both balancing and connection management. In that context, Sequoia stands out not only for its scale, but for the way it is being integrated into congestion relief before energisation.
