Ostrom Raises €20 Million to Accelerate Germany’s Smart Energy Revolution

Ostrom, Germany’s Smart Energy leader committed to making energy smarter, fairer, and greener, today announced a €20 million Series B funding round.

The round is led by Eneco Ventures. The venture capital arm of Dutch sustainable energy leader Eneco was joined by returning investors SE Ventures, Union Square Ventures, Adjacent, Übermorgen, and J12. This new investment round brings total funding in Ostrom to over €40 million.

‍Founded in Berlin in 2021, Ostrom combines full transparency, monthly cancellable contracts, and effortless switching with 100 % certified green electricity. Ostrom, a certified B Corp™, delivers an exceptional digital-first customer experience.

The Series B follows Ostrom’s fast growth in 2024, marked by a tripling of its customer base and the launch of Germany’s largest electric vehicle Virtual Power Plant (VPP). Moreover, Ostrom redefines what an energy provider means through its SimplyFair and SimplyDynamic products, offering electricity at cost and hourly dynamic pricing. In addition, customers can seamlessly manage their contracts and smart devices using the Ostrom App.

Jan van der Velde, Investment Director at Eneco Ventures: “We are excited to support Ostrom on their growth journey. Their rapid customer adoption and digital-first approach set a new standard for energy retailers. Further, Ostrom is a true pioneer in unlocking residential flexibility — delivering real value to consumers, accelerating the adoption of renewable energy, and strengthening grid stability.”‍

Ostrom will use the fresh capital to accelerate its nationwide rollout through subsidizing smart meters for its customers, enabling demand-side flexibility, and to strengthen its leading position in automation by expanding its tech capabilities. Already, Ostrom’s investment in AI means that more than half of customer operations are resolved automatically, empowering a lean, highly efficient team structure ready to scale further.

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The company also plans to rapidly grow its innovative NeoGrid™ Virtual Power Plant, connecting household devices and electric vehicle batteries to intelligently balance the grid, maximize renewable energy use, and reduce customer costs.

Matthias Martensen, Co-Founder & CEO of Ostrom, stated: “This Series B funding round represents more than just capital — it’s about strategic partnership. Eneco brings deep industry expertise while Ostrom maintains full independence, strengthening our platform as we accelerate smart meter adoption and scale our virtual power plant. With a clear focus on medium-term profitability, we are driving the transformation of the energy market.”

This Series B represents a critical milestone in Ostrom’s vision to build Europe’s smartest and most sustainable energy platform, leveraging cutting-edge automation, actionable data, and deep dedication to sustainability.

‍Karl Villanueva, Co-Founder & CMO/CPO of Ostrom, said: “Combining Eneco’s energy veterancy with Ostrom’s relentless product and customer focus enables us to use AI as a powerful multiplier for rapidly prototyping and releasing new products, already solving 50% of customer requests through AI, and allowing our small, highly capable teams to stay agile, innovative, and execution-driven.”

About Eneco Ventures:

Eneco Ventures is the venture capital arm of Eneco, a leading sustainable energy company headquartered in the Netherlands. With a proven track record of successful exits—such as Thermondo (acquired by E.ON) and Next Kraftwerke (acquired by Shell)—Eneco Ventures invests in ambitious early and growth-stage startups across Europe that reshape the energy landscape, from renewable generation and electrification to energy efficiency and grid flexibility. Moreover, Eneco Ventures leverages Eneco’s extensive operational expertise and networks. As a result, it partners closely with visionary entrepreneurs to scale transformative, climate-positive technologies that drive decarbonization and empower consumers.

Image Credit: Ostrom