Product

Zurück

With our opti.node software, you can implement the business models of the climate-neutral energy world in a very simple and maximally profitable way. Manage your commercial operations efficiently and in a legally secure manner.

Solutions

Commercial Asset Management

Electricity tax reporting Municipal participation § 6 EEG Revenue monitoring

PV auf Gewerbeimmobilien

Kundenstimmen

Von der Abrechnung bis zur Stromsteuer – opti.node ist bereits erfolgreicher Begleiter zahlreicher PV- und Wind-Projekte. Bürokratische Hürden im Betrieb gehören damit der Vergangenheit an. Überzeugen Sie sich selbst!

Qair Deutschland

Referenzen ansehen

Company

Zurück

We work for a world in which everyone can easily generate and share renewable energy themselves in order to save costs and protect the climate.

node.energy GmbH
Carl-von-Noorden Platz 5
60596 Frankfurt am Main

Wissen

Zurück

Updates

Abonnieren sie unseren Newsletter.

Blog

Neuigkeiten und Informationen rund um die grüne Energiewelt

Downloads

Kostenlose Materialien und Web-Seminare

24.8.2026

Fachartikel

Mieterstrom-Förderung für Gewerbeimmobilien: 5 Fakten und 1 Rechenbeispiel

Contact

Do you have any questions?
Our sales team is here for you.

Contact sales

Du willst Teil des Teams sein?

jobs@node.energy

Ihre Suche in node.energy

Zurück

Do you have any questions?
Our sales team is here for you.

Contact sales

Du willst Teil des Teams sein?

jobs@node.energy

Contact

Do you have any questions?
Our sales team is here for you.

Contact Sales

Du willst Teil des Teams sein?

jobs@node.energy

Management

Working together for a climate-neutral energy world

Our clients' projects are complex and individual.
We solve problems in planning and operation.

Karriere bei node.energy

Remote, mit Sinn und Gestaltungsfreiheit - bei node.energy kannst du alles haben! Finde heraus, welcher Job zu dir passt.

Mehr Infos

Our management

Matthias Karger

Founder & CEO

As managing director, Matthias takes care of all commercial issues, such as finances, strategy and personnel.

For Matthias, node.energy is the second start-up in the energy sector: in 2010, he founded TeraJoule Energy GmbH, which later became Clean Energy Sourcing AG (CLENS). At CLENS, he was responsible for setting up and operating one of Germany's first virtual power plants with an output of over 500 megawatts until 2013.

Afterwards he was also responsible for business development for the entire group and was managing director of two subsidiaries with a turnover of over 150 million euros p.a. (direct marketing of EEG systems and software services for virtual power plants).
After selling his shares at the end of 2015, Matthias left the company in August 2016 and founded node.energy GmbH.

Matthias is a business graduate and completed his studies at the University of Cologne, the University of St. Gallen (HSG) and the University of California Santa Barbara (UCSB).

Lars Manuel Rinn

Founder & Business Developer

As co-founder and CTO, Lars is responsible for coordinating technical product development. He also works on the source code almost every day.

Before founding node.energy, Lars learned how to combine IT and the energy industry at Clean Energy Sourcing AG and the Fraunhofer Institute for Solar Energy Systems. Lars studied Mechanical Engineering (B.Sc.) and Energy Science and Engineering (M.Sc.) at TU Darmstadt and the Universidade Federal do Rio de Janeiro.

Jörg Wiemers

Head of Engineering

Jörg ensures that the highest product quality is always achieved thanks to the right software architecture.

Jörg is an absolute professional in software development. He has over 15 years of experience and has already tackled many complex development projects. Among other things, before joining node.energy, he was responsible for the continuous integration infrastructure for SAP HANA. Jörg Dip studied. -Information technology engineer.

Michael Blichmann

Geschäftsführer / CSO

As managing director of node.energy, Michael takes care of all sales issues.

Michael comes to node.energy as an energy expert: after studying business administration, Michael spent 24 years with Mannheim energy supplier MVV Energie AG with various commercial functions and helped build up the energy services business.
From April 2010 to September 2011, he was responsible for sales and finance in the Kofler Energies Group as division manager.
From October 2011 to January 2017, as managing director of Bosch Energy and Building Solutions GmbH in Stuttgart, he built up the entire energy service company. From February 2017 to December 2019, he was responsible as managing director of Kübler HeizWerk GmbH and carried out the rental business there.

Robert Petzold

CFO

Robert is the CFO at node.energy and ensures that the company operates efficiently and meets its financial obligations.

Robert joined the company in 2024 and brings extensive experience in building and scaling finance organizations. Prior to node.energy, Robert led the global finance team at Forto and guided the company from its early stages through a period of significant growth.

Prior to that, he worked in investment banking and corporate restructuring at firms such as Kuna & Co., Ziems & Partner, and PwC, where he focused on M&A deals and complex restructuring projects. Robert holds degrees in finance and economics from the University of Münster and IE University. In his free time, he is a passionate free diver and finds peace and inspiration in the depths of the ocean.

Lucia Bonell

Product Manager

Together with her product team, Lucia ensures that asset managers of renewable energy plants have access to software with opti.node that simplifies their recurring work and thus drives the expansion of their sustainable business models.

Lucia has been passionate about evaluating the economic, technical and regulatory aspects of renewable energy business models since 2017. At node.energy, with a deep understanding of the challenges and opportunities that arise in the dynamic world of renewable energy, she is committed to developing innovative solutions that not only save time but also increase the efficiency and productivity of our customers. Lucia completed her master's degree in renewable energy and energy efficiency at the University of Kassel.

Marcel Kraft

Product Manager Commercial PV

As an experienced specialist in decentralized energy concepts, Marcel ensures that our software and services match the needs of our customers.

With his broad expertise, Marcel is a sought-after speaker at conferences and meetings and author of several specialist energy publications. Before joining node.energy, Marcel was involved in setting up the Clean Energy Sourcing AG virtual power plant together with Matthias Karger from 2011 to 2013. As a product and sales manager, he was then responsible for the growth of CLENS' virtual power plant and direct marketing portfolio. Marcel studied energy economics at Darmstadt University of Applied Sciences.

Maria Werner

Vice President People & Organization

Maria is responsible for all personnel management at node.energy and is therefore the central point of contact for applicants and our employees.

Maria completed her master's degree in business psychology (M. Sc.) and led the digital division of a media company for several years, including as a member of the management board. She then moved to a Freiburg start-up in the energy sector as Head of HR and has now been strengthening our management team since December 2021. She is particularly interested in the selection of suitable new colleagues who are a good fit for the existing teams, as well as the development of each individual's personal skills. If you are interested in joining our teams, she looks forward to receiving your inquiries and applications at jobs@node.energy.

Therese Klarner

Product Manager Data Platform

At node.energy, providing energy data is a core competence. Together with the platform team and in close coordination with our market partners, Therese is working to ensure that the required energy data finds its way to our customers. As automated and reliable as possible.

Therese is an experienced product manager with a deep understanding of the energy industry and a mathematical background. Since joining the energy industry at Fraunhofer IOSB-AST in 2014, she has gained valuable experience in modeling and analyzing energy systems. During her almost 4 years as a product manager for the district energy management solution at Ampeers Energy GmbH, she has shown that she is passionate about promoting sustainable energy supply solutions, integrating heterogeneous interfaces and building a SaaS product from the ground up.

Barbara Zeppenfeld

Head of Customer Success

Barbara and her team work together to ensure a smooth introduction to our opti.node software for our newly acquired customers and provide them with advice and assistance in their daily work.

Barbara has been serving various clients throughout her professional life. Most recently, she worked in a digital start-up in the media industry, where she was able to gain a lot of experience onboarding customers and subsequent support during operational work with the software.

Switching to node.energy and thus to another industry was a very conscious step for Barbara. In doing so, she wants to make her contribution to the energy revolution and make it as easy as possible for node.energy customers.

Maria Imhof

Head of Accounting

As Head of Accounting, Maria ensures transparency in financial figures and thus creates a reliable basis for management decision-making.

In 2016, Maria completed her studies at DHBW Mosbach in the subject of Business Taxation, Corporate Accounting and Finance. She then worked as a team leader at a tax office in Würzburg until February 2022 for advising, preparing tax returns and annual financial statements and financial accounting for numerous clients.

Maria has been responsible for Finance — Accounting for us since March 2022. Maria also successfully completed the tax advisor exam in March 2022 and is therefore well prepared for emerging tax issues.

Simon Reiser

Head of Marketing

Simon is a digital marketing professional through and through. His mission: to engage the right target audiences with high-quality content, helping them easily implement their business models in the renewable energy sector.

He has over 12 years of experience in online marketing, working both in-house and at agencies. Simon holds a PhD in literature from the University of Freiburg.

Aktuelles von node.energy

Fachartikel