Financial Close for Major Dutch Battery Project
Return has successfully reached financial close for the Sirius battery storage project, a massive 200MW/800MWh (4-hour duration) facility located in Winschoten, Groningen, in the Netherlands. The project represents a substantial investment of approximately €180 million and is scheduled to enter commercial operation in the fourth quarter of 2027. The financing was secured through Return’s battery portfolio framework, which boasts commitments of up to €400 million. The lending group includes major financial institutions such as ING, NatWest, Deutsche Bank, ABN AMRO, and Rabobank, reflecting strong institutional confidence in the Dutch BESS market.
Innovative Tolling and Grid Connection Models
A key feature of the Sirius project is its commercial structure. Vattenfall will control the commercial dispatch of the battery under a long-term fixed-price tolling agreement with Return. This innovative structure effectively separates long-term ownership economics from day-to-day optimization. It allows Vattenfall to deploy the asset across its broader portfolio for wholesale trading and balancing services while paying Return a fixed fee for access. This aligns with Vattenfall's strategic goal of contracting at least 1.5GW of battery capacity across its markets.
Grid connection for the Sirius project will utilize TenneT’s high-voltage network via the Meeden substation, employing a Time-Dependent Transmission Rights framework. This agreement guarantees access to transmission capacity for at least 85% of the time, while permitting restrictions during peak congestion. TenneT estimates that this framework could unlock up to 9GW of otherwise unused off-peak capacity across its network, greatly benefiting flexible assets like battery storage. The project's technology and construction partners include Huawei, Hanab, and Omexom, ensuring robust execution.
Source: Electrical News
This article was assisted by AI analysis. Please refer to the original source for official information.