The Development of CUBE CONCEPTS
Our Company History
Since changing its name from EIGENSTROM DIREKT GmbH in 2021, CUBE CONCEPTS has experienced extremely dynamic growth. By expanding its portfolio, the startup and “PV architect” has now become a systems developer for integrated energy projects. With our full-service approach, we are now constantly implementing new turnkey systems through Contracting and responding flexibly to regulatory requirements.
This development was made possible as early as 2022 by the entry of the first institutional investor. Since then, additional strong financial partners have enabled the implementation of sustainable energy projects without requiring upfront investments from customers, while simultaneously strengthening CUBE CONCEPTS’ market position in the European and international Contracting market.
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April 2026
We are further expanding our project pipeline in Eastern Europe and securing additional photovoltaic projects in the Czech Republic. At the same time, international growth is being driven forward: the sales team at the Palma de Mallorca location is being expanded in a targeted manner to meet the rising demand even better.
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March 2026
With the acquisition of 50 MW / 100 MWh of battery storage capacity, CUBE CONCEPTS secures a project in the Tušimice Energy Park in the Czech Republic. The ready-to-build project with its rare 400 kV direct connection marks an important step from energy service provider to independent energy producer.
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February 2026
CUBE CONCEPTS wins additional investors for its fast-growing portfolio in Eastern Europe. This creates the financial prerequisites to implement photovoltaic and battery storage projects even faster, more scalably, and securely in the long term.
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January 2026
At the annual kickoff, more than 45 employees from all locations came together for the first time. The focus was on the strategic direction for the coming years, the further development of processes, and the introduction of new BESS planning tools. Workshops and team events also strengthened cross-location cohesion.
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December 2025
We are setting the course for further growth: the sales team is being restructured, sales processes optimized, and digitalization systematically driven forward. In addition, targeted training programs are being established and the team is being expanded with new personnel to serve customers even more efficiently and individually.
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November 2025
A newly commissioned solar park in Bavaria is now producing electricity for our industrial customers from the paper industry, which consumes around 60 MW of energy annually – an important milestone on its path towards greater security of supply and sustainability!
In addition, we are continuing on our growth path and welcomed six new colleagues on November 1st.
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October 2025
For WP Holding, we started work on a nearly 1 MWp off-grid system and a 2 MW battery storage system. Additionally, we have completed the implementation of a scalable, cost-efficient energy system for fleet electrification – including the sizing for 4 electric trucks and two 400 kW dual chargers.
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September 2025
Start of construction in Rakovník, Czech Republic:
The official kick-off for our 1 MWp PV system for PUReM in Rakovník has taken place – another step in the expansion of international projects.
Read the article hereVisit to the Solar Solutions in Birmingham:
During our visit to the trade show, we discovered a promising new provider of BESS sizing software – an important component for future projects. -

August 2025
In Raskovice, we started our first battery storage system project (BESS) with an capacity of over 3 MWh. This expanded our portfolio with a key component of the energy transition.
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July 2025
The first order for a large-scale PV project in the Czech Republic has been signed and can soon begin! With this, we have set another milestone in our international expansion.
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June 2025
Our technical team welcomed a new COO and began the next phase with fresh momentum. At the same time, we introduced new, more efficient processes and digitized workflows. The internal Summer Exchange in Mallorca provided for professional exchange and team spirit. It was a complete success, with a full program and plenty of space for interactions outside of the office routine.
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May 2025
At the PwC Annual Conference 2025 for energy-intensive companies, we were able to gain important information first-hand about the energy issues facing large companies and how we can support them.
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April 2025
With the change in management, we have also restructured our finance team to be ready for the future. With the addition of new personnel, we have created a solid foundation for the next major projects.
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March 2025
With our customers Schäfer-Werke and Purem by Eberspächer, we produced the first project films from start to finish. This set new standards in project marketing and the documentation of our systems.
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February 2025
The new digital team is now making internal processes more efficient and automating processes – new ways for creative ideas, innovation, and sustainable growth.
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January 2025
At the 2025 annual kickoff in the snowy winter mountain resort of over 30 CUBIES, workshops and team events were held to promote motivation and cohesion. The weekend marked the start of our „Growth“ mission.
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December 2024
With the opening of our office in Prague, we further expanded our presence in Eastern Europe. In parallel, we increased the staffing levels in the HR and Legal departments.
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November 2024
We have entered into a strategic partnership with Kübler GmbH for efficient hall heating systems. Additionally, we concluded an offsite PPAs for over 60 MW from a solar park with a leading paper manufacturer.
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October 2024
We have once again expanded our already strong partner network and acquired another experienced EPC and battery service provider. This has now made us even more professional and efficient in our ability to successfully realize future PV projects.
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August 2024
The Head of Terms has been successfully negotiated with an internationally operating real estate developer. The company specializes in high-quality commercial and residential properties and acts as an influential player in the real estate investment sector worldwide.
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July 2024
Portfolios 2 and 3 were successfully sold to an established refinancier, increasing the volume to over 35 million euros. This strategic sale strengthens the financial position and opens up additional opportunities for further development.
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June 2024
Our annual Summer Exchange took place in June on Mallorca, where colleagues from various departments met and exchanged ideas in interactive sessions. Through cross-departmental group work, current developments, particularly in the field of battery technology, were presented and discussed.
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May 2024
5MW at two sites have been signed for a global manufacturer of carbon-based materials, specializing in graphite products and composite materials for various industries such as automotive, aerospace and chemical.
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April 2024
We are expanding our team by hiring additional staff in the areas of administration, marketing and project management. Our company is developing into a diverse, international working environment that benefits from cultural diversity and exchange. With employees from 20 nations, we reflect the global orientation of our company and promote open, intercultural cooperation.
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March 2024
We are very pleased to be able to bring to life a framework agreement with one of the world’s leading automotive suppliers. As part of this successful partnership, we will begin implementing photovoltaic systems at four locations this year, thereby making a significant contribution to sustainable energy supply.
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February 2024
We are very pleased to announce that CUBE CONCEPTS GmbH has been awarded the top rating as "Top Employer"!
Following an independent employee survey, we received the coveted employer seal "Top Arbeitgeber (DIQP)" with the rating "very good"..
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January 2024
New German-British partnership:
Olympus Power and CUBE CONCEPTS are developing international PV projects together.
We are proud to ring in the new year with our new German-British partnership! With OLYMPUS POWER LTD, we have gained a wonderful partner to realize large-scale international PV projects with a planned volume of 500 MWp!
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December 2023
Our EPC service (Engineering, Procurement and Construction) is being continuously expanded. We are expanding our reliable EPC network to achieve our goals.
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November 2023
Cube Concepts has signed an important framework agreement with a strategic partner from the automotive supplier industry. The North American automotive supplier operates worldwide.
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October 2023
Investors 3.0
Cube Concepts is now becoming increasingly attractive to investors. Awareness of commercial and industrial photovoltaic roof systems is steadily increasing.
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September 2023
Ground-breaking ceremony for the SCHÄFER WERKE Group's 2 MWp solar park
The ground-breaking ceremony for the largest ground-mounted PV system in the Siegen-Wittgenstein district to date has taken place.
A photovoltaic system will be built on an area of around 11,500 square meters to the north-east of the SCHÄFER site. Up to 4,560 solar modules will generate an output of approx. 2,000 kWp. This will cover around a third of the total electricity requirement.
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July 2023
The team is growing! We Cubies are now represented by 20 nations from Belarus, Lebanon, Sri Lanka, Switzerland and Turkey.
Diversity and tolerance are a high priority for us as a start-up. We promote diversity!
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June 2023
During the CUBE CONCEPTS Exchange Meetings, all employees from Germany and Spain were able to exchange ideas in person in Mallorca, through varied and interactive sessions.
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May 2023
The history of our young company continues to be groundbreaking. We are proud to be able to present 30MW in nine projects within one week.
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April 2023
In mid-September, a 13 MW PV system was presented on the roofs of a steelworks as Contracting a pilot project and is now being planned and built.
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March 2023
Currently, 100 projects are in the final stages of development or have already begun construction.
We were there! CUBE CONCEPTS was allowed to pitch for the world's largest rooftop PV system with over 55MW
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February 2023
We are celebrating the largest individual achievement so far.
In this and the following years, we will be installing PV systems for an internationally operating plant construction company.
The start is with 2 locations in southern Germany with a total of over 5.5 MW.And our new website goes online. The team is finally growing and more than 30 people are present at our kick-off meeting.
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January 2023
January starts like December ended. The demand for commercial PV projects and a PV architect continues unabated.
The target for 2023 is set at 200 MW of signed PV projects.
Groundbreaking for the solar carport project. Four parking rows with only five supports will be covered over a length of 60m.
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December 2022
What a year!
While the target in January 2022 was still 20 MW of sales, at the end of the year we were proud to have signed contracts for PV projects totaling 60 MW.
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November 2022
With additional new qualified and experienced staff, we plan the much-needed relaunch of our website and aim to achieve a marketing turnaround within 8 weeks.
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October 2022
Our technical team continues to grow and highly experienced employees support us in the implementation of PV projects.
53.9 MW is the figure of the month.
This is the volume of inquiries from the industry in October 2022 -
September 2022
The momentum continues unabated. In the middle of the month, a 13 MW PV system on the roofs of a steelworks will be presented as Contracting an installation.
The team needs to be further strengthened in all areas; unfortunately, finding employees is proving very difficult.
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August 2022
Nowadays, the PV systems are so large and so complex that the planning software used is reaching its limits.
Just for one large customer from southern Germany, two team members are busy planning and calculating for a week.
On the hottest day of the year, we move into our new office -

July 2022
Finally, we find a new „home“ right near the old office. We therefore remain loyal to the location.
We will be appointed as partners for PV projects by the first truly strategic customers, i.e., companies with multiple locations both domestically and abroad.
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June 2022
June, which is the month of photovoltaics, is going to continue exactly the same way.
PV systems with a volume of almost 11 MW are planned and presented -

April 2022
In Spain Contracting, contracts with a volume of almost 2 MW are being offered to an internationally operating company.
The team continues to grow. 25 employees are already taking part in the Exchange meeting
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March 2022
The team and the projects are becoming increasingly international; - PV plants in England are being planned and are expected to be built in 2023.
An existing Contracting customer wants to use PV electricity at another location as well, and a 1.8 MW plant is planned as the largest Contracting installation at that time.
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February 2022
The momentum continues. The electricity price explosion has reached the industry and is increasing the need for action on the part of the industry.
As a further cooperation partner, e-cuno is adding its expertise in funding opportunities related to renewable energy to the expertise of CUBE CONCEPTS.
Industrial companies with high electricity consumption are now increasingly being approached. We have decided to no longer develop the market for small PV systems up to 30 kWp, partly due to a lack of construction capacity and a further massive increase in construction prices.
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January 2022
The first company-wide kick-off meeting takes place at the end of January and brings massive momentum to sales and the entire company.
The sales process is converted to teams and 3 new employees start in sales and technology.CUBE PLUS is established as a supplement to CUBE DESIGN & BUILD
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December 2021
The price of electricity in Germany is still only going up, but the construction costs for PV systems are also rising massively.
Further customers are being acquired, but many companies are still hesitant. The office in Spain is being further expanded -

November 2021
Another large chemical company is acquired as a customer and a – in the meantime – small installation of 100 kWp is built.
The first large solar carport with approximately 400 kWp is planned and the building permit is being prepared. Another Contracting installation with 400 kWp is being built.
Negotiations are now also being held with the chemical company from Witten regarding the construction of photovoltaic systems in Austria and Great Britain. -

October 2021
The electricity market in Germany is starting to explode and CUBE CONCEPTS is at the Intersolar in Munich. The company moves into its "own" office in an office center in Spain
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September 2021
The position of CFO is filled, EIGENSTROM DIREKT now officially becomes CUBE CONCEPTS GmbH and the new website goes online. The closing with SUSI PARTNERS takes place on September 10. The idea of CUBE Vision as a dedicated dashboard for monitoring PV systems is implemented
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August 2021
The contracts with SUSI Partners are finalized, and the internal project management is being reorganized.
CUBE SERVICE GmbH and Clean Energy Contracting Pro GmbH are established to implement the Contracting-model
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July 2021
The first order for the construction of a photovoltaic system in Spain is placed. The Solar Carport is now ready for market and will be presented to the first customers.
Due to stalled financing negotiations, no new PV installations will be built for the first time, and due to the upcoming election, large-scale projects from customers will be postponed. -
June 2021
Further Contracting customers are acquired through the mediation of an energy provider.
At the end of June, the planning volume is almost 50 MW -
May 2021
The team in Spain is being expanded and gaining momentum with the addition of additional (sales) employees. Initial discussions with SUSI Partners begin to fund our Contracting facilities.
To meet the reporting requirements, internal accounting must be strengthened professionally.
In parallel, the development of the solar carport is now well underway.
Five additional photovoltaic systems are being built and put into operation as purchase-based projects. -

April 2021
From self-generated electricity, CUBE CONCEPTS is launching with a new look and a new logo. Sales is being strengthened with additional employees to handle bookings, and our „garage“ is bursting at the seams.
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March 2021
The largest PV system to date with 750 kWp is being built and will be put into operation on March 31st. It is therefore one of the last systems in Germany of the size required by the EEG.
In Spain, a planning and engineering department is being established in parallel. -
February 2021
In mid-February, the project volume is 26 MWp, with electricity production of 14.3 million kWh and an investment volume of EUR 10 million.
The technical implementation of solar carports is becoming more real and concrete, comprehensive technical details are being clarified. In parallel, additional PV systems are being built as purchase-based installations.
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January 2021
The planning department becomes the technology department and is strengthened in terms of personnel. Other areas of the company, such as administration and marketing, have to be massively expanded.
In Spain, the first employee is hired to conduct market research, and the EEG 2021 comes into effect.
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December 2020
Two more photovoltaic (PV) systems are being built. Plans are being drawn up to implement the first PV system at a chemical site in Witten.
The first talks regarding cooperation in the implementation of solar carports with one of the leading steel construction companies are being successfully conducted. Another collaboration with ampere.cloud, the „data delivery system“ for CUBE Vision, is being established.
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November 2020
The internal sales department is being further expanded with additional staff in research, acquisition and sales. Consequently, digitalization must also be expanded, as the project volume covers almost 100 PV systems.
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October 2020
Another small plant with 80 kWp is being built and the internal planning department is being reinforced. The contract models for the operators Contracting are being finalized.
This makes us one of the very few companies in Germany to have EEG-compliant and reliable contract structures for our customers
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September 2020
The next PV plant with approximately 200 kWp is being built and commissioned virtually „at your doorstep“. For the first time, the entire construction of the plant, including drone flights, is documented due to the walking distance.
First collaborations, e.g. with the manufacturer of an automated energy and production optimization system, are launched. This expands our service offering and our range of expertise.
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August 2020
Foundation of the in-house planning and project planning department for PV systems. The team comprises 6 people, plus 7 external sales employees.
The project pipeline comprises 32 plants with approx. 3 MW
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July 2020
The Contracting-Modell Eigenstrom Direkt model is finalized; external distributors – also for the sale of project-based systems – are connected.
The 3rd PV plant is commissioned and Clean Energy Invest is founded -

June 2020
On June 5, 2020, Eigenstromdirekt's first PV system is connected to the grid as a contracting system. The extensive contracting agreements still in place due to the 2020 EEG are revised.
The second PV system is built and put into operation
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May 2020
We move into our first office, our "garage", on May 2, while at the same time acquiring further customers. The first website and other marketing materials are developed
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April 2020
Groundbreaking for the first PV system and EEG commissioning on April 27th. On April 28th, Eigenstrom Direkt GmbH – Energie Contracting is founded and the first own sales representative is hired.
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March 2020
During the first lockdown, the business idea is further promoted and developed with partners from NRW, while financing for the first PV installation is secured.
It is decided to establish Eigenstromdirekt GmbH -
February 2020
Financing for the first PV system is applied for. At the same time, external sales partners are acquired and talks are held with investors
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January 2020
Together with the investment partner PIE Palace Independent Energy GmbH, Frankfurt has decided to build the first photovoltaic system with approximately 220 kWp.
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December 2019
The founders of the later CUBE CONCEPTS are conducting initial concrete discussions about implementing attractive Contracting models for photovoltaic systems for commercial and industrial companies.