Energy startup receives €7 million in Series A financing round

Frankfurt am Main, 27.07.2022 – A total of four new investors are joining the company, and existing investors such as High-Tech Gründerfonds (HTGF) and renowned business angels are once again contributing fresh capital.

The selection of the four new investors of the Series A took place thereby completely consciously. The financing round is led by Cologne-based VC BitStone Capital, the leading PropTech fund with strong expertise in the real estate industry. As co-investors, 10x Founders brings extensive experience in the software-as-a-service sector and the impact investor BonVenture a clear focus on sustainability. As an international investor from the energy industry, Helen Ventures from Finland is also participating in the financing round.

The software “opti.node” developed by simplifies the management of wind and solar plants. As the “digital lubricant of the energy turnaround”, opti.node takes on the task of fulfilling the numerous bureaucratic requirements in particular: Billing, tax forms and notifications to authorities can be easily created automatically by plant operators with opti.node. The software is already being used to manage around 10,000 wind energy and solar plants, making the market leader in Germany.

However, for Matthias Karger, founder and CEO of, this is just the beginning:

“The future energy supply will be based on millions of renewable energy systems and every major building will also be a power plant at the same time. Many new providers such as real estate managers and citizen energy cooperatives are driving the change with new business models. In doing so, they are regularly confronted with the complicated rules and bureaucratic requirements of the energy market. This results in enormous market potential and further growth opportunities for us.”

“Rising energy and CO2 prices and the desire for security of supply make renewable energy plants more attractive than ever for real estate. makes it easy for professional owners to evaluate this potential and operate the plants successfully and in a legally secure manner. I am pleased to support the team in this socially important task”,

explains Marc Stilke, Venture Partner at BitStone Capital and future Chairman of the Advisory Board at

Therefore, will invest the seven million euros received in the Series-A in the further development of the software. The goal is to build a comprehensive software platform that enables professional plant operators from the commercial and real estate sectors to easily implement new business models such as solar power direct deliveries (e.g. tenant power or power purchase agreements/PPAs) and self-supply. For this purpose, the software will be enhanced with additional functions and expanded into an end-to-end solution platform.


Based in Frankfurt am Main, GmbH is a fast-growing company working towards a sustainable energy future. was founded in 2016 by Matthias Karger and Lars Rinn and develops and distributes the SaaS solution “opti.node” for professional operators of renewable energy plants. More than 9,500 wind turbines in over 2,500 wind and solar farms as well as more than 400 commercial and industrial properties are already using opti.node. In 2020, was honored with the Handelsblatt Energy Awards. Currently, employs about 50 people.