Castleton Commodities International ("CCI") acquired a majority stake in S4 Energy BV ("S4 Energy"), a company that develops, owns and operates large-scale energy storage systems.

Based in Rotterdam, the Netherlands, S4 Energy builds hybrid storage systems by combining grid-scale lithium-ion batteries together with the company's proprietary KINEXT flywheel technology. S4 Energy has an operating portfolio of 25MW in the Netherlands and a project pipeline across various stages of development and construction. The company targets building more than 300MW of long-duration storage assets over the next 3 years throughout Western Europe.