O
Ostrom
Energy · Berlin, Germany · Founded 2021
Digital green energy management for German households MoreLess
Ostrom is a digital energy provider based in Berlin, Germany, that supplies households with 100% green electricity. The company was founded in January 2021 by Matthias Martensen (CEO) and Karl Villanueva (CMO/CPO). The idea originated from Martensen's experience as a consultant for energy companies, where he identified inefficiencies and a lack of customer focus. Villanueva brought his expertise in user acquisition and product experience from various B2C startups. After launching an early version of their product in May 2021, the company has seen significant growth.
Ostrom operates on a subscription-based model, charging a flat monthly fee and providing electricity at market cost. This model is designed to align the company's incentives with customers' interests in reducing energy consumption. The company offers flexible, monthly cancellable contracts and provides support in both English and German. Customers can manage their accounts, track consumption, and control their tariffs in real-time through the Ostrom mobile app. The company has received B Corp certification, reflecting its commitment to high social and environmental standards.
The company's offerings include its SimplyFair tariff with predictable billing and the SimplyDynamic tariff, which utilizes smart meters for hourly, real-time pricing. This dynamic pricing allows customers to use energy when it is cheapest and greenest. Ostrom is actively involved in accelerating the smart meter rollout in Germany, partnering with other energy providers and aiming to install one million smart meters for its customers by 2030. The company has also developed Germany's largest Virtual Power Plant (VPP), which connects and manages decentralized energy assets like electric vehicles, to help stabilize the grid.
Ostrom has raised a total of over €40 million in funding across several rounds. A notable Series B funding round in June 2025 brought in €20 million, led by Eneco Ventures, to subsidize smart meter installations and scale its VPP. Other investors include SE Ventures, Union Square Ventures, Adjacent, 468 Capital, and J12 Ventures.
Keywords: green electricity, digital energy provider, renewable energy, energy management platform, smart meter, dynamic pricing, virtual power plant, B Corp, energy transition, monthly tariffs, German energy market, electricity-at-cost, EV charging, demand-side flexibility, energy consumption tracking, clean technology, sustainable energy, Berlin startup
Company overview
Ostrom company information
The essential company record, classifications and operating signals in one place.
- Status
- Operational
- Founded
- 2021
- Headquarters
- Berlin, Germany
- Employees
- 62
- Open positions
- 4
- Dealroom signal
- 92.7
Valuation & funding
Ostrom funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| SERIES B✓Equity / VC | Jun 2025 | $22M | $88M | J12 Ventures · Eneco Ventures · Übermorgen Ventures · Union Square Ventures | ↗ |
| SERIES A✓Equity / VC | Sep 2023 | $8.2M | $51M | Adjacent · J12 Ventures · Übermorgen Ventures · SE Ventures | ↗ |
| SERIES A✓Equity / VC | Dec 2022 | $10M | $41M | J12 Ventures · Übermorgen Ventures · Adjacent · Union Square Ventures | ↗ |
| SEED✓Equity / VC | Jan 2022 | $4.8M | $19M | Eric Wahlforss · Anton Rummel · Philipp Klöckner · J12 Ventures | ↗ |
| EARLY VC✓Equity / VC | Jul 2021 | $0 | — | Alexander Kudlich · 468 Capital · Philipp Klöckner | — |
| OtherOther financing | Dec 2020 | Undisclosed | — |
Financials
Revenue and workforce over time
Available revenue and workforce history. Fields without reported data are omitted.
| Year | Revenue | Growth | Employees |
|---|---|---|---|
| 2026 | $2.5M | 0% | 62 |
| 2025 | $2.5M | 0% | 53 |
| 2024 | $2.5M | 0% | 43 |
| 2023 | $2.5M | +19% | 36 |
| 2022 | $2.1M | — | 24 |
Growth signals
Ostrom website traffic
Latest recorded traffic for Ostrom is 67K monthly website visits, down 19.3% over the last three months. Ostrom's team grew 17% over the past year.
Hiring
Open positions at Ostrom
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Comparisons
Ostrom compared with similar companies
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Talent graph
Ostrom's talent
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Global footprint
Where Ostrom has talent and traffic
team presence
In the news
Latest news about Ostrom
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Market sentiment
What the market is saying about Ostrom
An AI-synthesized read of the highest-engagement posts about Ostrom on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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