COMPANY PROFILE

Ostrom

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Digital green energy management for German households

Berlin, GermanyFounded 2021Energy

Valuation $50–100M Last recorded · 2025

Revenue $1–10M Latest reported FY

Headcount <100 Current team size

Total funding $10–50M Disclosed equity funding

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About Ostrom

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.

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At a glance

Status: Operational
Founded: 2021
Headquarters: Berlin, Germany
Employees: 62
Open positions: 4
Dealroom signal: 92.7/100
Industry: Energy
Sub-industry: Energy Providers
Sector: Energy, Sustainable Development Goals, Climate Tech, B Corp, Energy Management System, Grid Technology, Hard Tech, Berlin ClimateTech 2024
Technology: Mobile app
Business model: SaaS
Client focus: b2c
Links: Website LinkedIn X

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News, research, reports and resources connected to this company by Dealroom

Funding history

6 recorded events

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	↗

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Financials

Revenue over time

Revenue, earnings and other financial measures where available. Years marked “E” are estimates.

Year	Revenue	Growth
2026
2025
2024
2023
2022		—

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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.

Latest monthly visits67K 3-month web change-19.3% 1-year team growth+17%

Monthly website visitsJan 2022–Jul 2026

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Open positions

Openings linked to this company in Dealroom

Customer Care Specialist (m/w/d)Berlin, Germany · CSM & Support · Jul 24, 2026 Senior DevOps Engineer (AWS Platform & Backend Support)Berlin, Germany, Western Europe, Europe · DevOps · Jul 17, 2026 Head of Marketing (m/w/d)Berlin, Germany, Western Europe, Europe · Marketing & Communication · Jul 3, 2026

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