Shareholders & Investors | S4 energy

S4 Shareholders & Investors

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Our Achievements

S4 Energy currently has four projects in commercial operation in the Netherlands.

Outside the Netherlands, S4 has a high-voltage project in the UK approaching commercial operation in early Q2 2026, alongside a further three projects in Germany expected to reach commercial operation during 2026.

Over the next 12 months, S4 expects to have more than 350MWh in operation across three countries, with at least a further 1,000MWh under construction.

Why Partner with S4 Energy

S4 has a rapidly expanding pipeline of BESS projects in development, construction, and operation.

The company operates across the full value chain – with in-house expertise from origination to commercial operation – in the UK, Germany, and the Netherlands. 

Led by an experienced management team, S4 has an established track record of delivering projects on schedule and within budget, supported by established relationships with leading OEMs and EPCs.

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Risk & Mitigation

S4 Energy's in-house expertise forms the foundation for active risk management across all project phases, from site selection and grid connection to legal review, market analysis, construction, and long-term operation.

Responsible risk management starts with ensuring that each project is supported by appropriately qualified and experienced personnel, including in-house high-voltage–certified technical specialists. S4 Energy complements this internal capability by partnering exclusively with selected tier-1 OEMs, EPC contractors, and development partners that meet strict technical, safety, and delivery standards.

This integrated, end-to-end approach supports consistent project execution and helps maintain confidence in S4 Energy as a fully integrated battery energy storage platform.

Transparency and Governance

S4 is a fully autonomous subsidiary of CCI, a leading global energy commodities merchant and infrastructure asset investor. 

S4’s competitive edge is driven by CCI’s cutting edge expertise in our markets, backed by the best minds in the industry and powered by deep fundamental research and advanced analytics. 

S4 reports to a supervisory board representing our shareholder. S4 maintains strict compliance with all accounting and operational standards and has adopted market standard governance procedures across all levels.

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Company Updates & Insights

As a private company S4 does not publish regular public financial reports, but our website will feature a range of public materials on our projects’ progress, market trends, and regulatory updates. 

If you would like to find out more about our journey and ambitions, don’t hesitate to reach out via the contact us page.

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Frequently Asked Questions

S4 Energy currently operates in the Netherlands and is expanding its activities in the United Kingdom and Germany. These markets are characterised by rising renewable generation and increasing requirements for grid flexibility and balancing services.

S4 Energy currently has four battery energy storage projects in commercial operation in the Netherlands. In the United Kingdom, a high-voltage project is expected to reach commercial operation in early Q2 2026, with additional projects in Germany anticipated to become operational during the course of 2026. S4 Energy’s flagship high-voltage project is targeted to reach commercial operation in 2028.

All planned capacity figures and timelines are indicative and subject to development progress, permitting, and construction schedules.

S4 Energy is majority owned by Castleton Commodities International (CCI). No further details regarding ownership structure are disclosed publicly.

S4 Energy is governed by its management team, which reports to a Supervisory Board representing the shareholder. The company applies market-standard governance practices and complies with applicable accounting, regulatory, and operational requirements in the jurisdictions in which it operates.

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