GreenSketch launches in Germany: AI platform for the solar industry analyzes all 28 million residential rooftops in the country for the first time

- The German Rooftop Valuation Report analyzes more than 28 million roofs across all 401 districts in Germany as part of GreenSketch’s market entry—Bavaria leads, Berlin ranks last.

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GreenSketch's “Rooftop Valuation Report Germany”
© GreenSketchMunich (renewablepress) - GreenSketch, the AI-powered platform of Australian solar distributor OSW Group, is now available in Germany. To mark its market launch, the company is presenting the German Rooftop Valuation Report—the first analysis to individually assess all 28 million residential rooftops in Germany using artificial intelligence (AI). The result: an untapped savings potential of 45 billion euros in annual electricity costs nationwide.

The report was released as part of the official German launch of GreenSketch at an evening event held at Villa Flora in Munich, kicking off Intersolar Europe. More than 180 guests from politics, academia, real estate, and the solar industry attended the event, which included the report presentation, a live demo of the Emily AI technology, and a panel discussion on the value of German rooftops.


What contribution does GreenSketch make to the energy transition?

GreenSketch is the first free end-to-end platform for the solar industry, combining roof analysis, system design, lead generation, and proposal creation in a single system. The platform is operated by the Australian OSW Group (which includes OSW Distribution), Australia’s leading solar distributor. At its core is Emily, the platform’s AI agent: where installers today work with up to five different tools, wait days for proposals, and lose leads due to slow processes, Emily replaces the entire workflow. From roof analysis to system design to the final proposal, the process now takes only a few minutes. Homeowners can calculate their savings potential themselves in just 60 seconds via Emily’s public interface. They are then directly passed on as qualified leads to the appropriate installer. This makes GreenSketch not only an efficiency tool for the industry, but also a driver of the energy transition.


The report: Key findings at a glance

The German Rooftop Valuation Report used artificial intelligence to individually analyze more than 28 million residential buildings across all 401 districts and independent cities. Despite a total potential of €45.43 billion in annual electricity cost savings, only 4.1 million German homes currently have a solar installation.

The average German household could save around €1,620 in electricity costs per year—with an average investment of €12,167 and a payback period of approximately 8.44 years. After 20 years, average returns amount to €19,030 per household. The average internal rate of return (IRR) is 11.5%. Extrapolated across all analyzed rooftops, the estimated total return after 20 years amounts to €533.7 billion. All calculations are based on an optimized solar and battery configuration (10.34 kWp PV + 9.6 kWh battery) and exclude government subsidies.


A clear north-south divide

The study reveals a pronounced regional performance gap. Bavaria ranks first across all five metrics: with average annual savings of €1,696, a payback period of 8.00 years, and a 20-year return of €20,504 per household. Berlin ranks last in all categories, with €1,388 in annual savings, a 10.10-year payback period, and a 20-year return of €14,555—nearly €6,000 less than in Bavaria. This is primarily due to Bavaria's rural structure compared to the dense urban environment of Berlin. However, even the weakest locations still show positive returns. According to the study, solar energy pays off across all of Germany.

The highest-performing districts are concentrated in the Allgäu region and Upper Bavaria. Kempten (Allgäu) achieves the highest 20-year return of all German districts at €21,719. The weakest results are found in northern coastal regions and city-states.


Study published at a critical time

The report is being released at a time when the German solar market is under significant pressure. Installation of residential rooftop systems fell by 21% in the first quarter of 2026 (according to BSW Solar), although Germany must significantly accelerate expansion to meet its 215 GW target by 2030. At the same time, the draft Renewable Energy Act (EEG) 2027 proposes abolishing fixed feed-in tariffs for new systems under 25 kW and limiting feed-in from smaller systems to 50% of installed capacity—effectively making battery storage a prerequisite for economic viability.

“Precisely because the framework conditions are changing, homeowners and installers need reliable data on what a roof is actually worth,” says Christian Seidemann, Lead CSM DACH at GreenSketch. “For the first time, this report delivers address-level valuations for all of Germany and shows that rooftop systems pay off even without subsidies.”


What makes the methodology unique

Unlike simulation-based studies, the report’s AI—Emily, GreenSketch’s AI agent—analyzed each of the 28 million rooftops individually. The methodology is based on satellite imagery, AI-driven 3D building reconstruction, and Geographic Information Systems (GIS)—digital mapping and building data that capture roof pitch, orientation, and shading for each individual building. More than 87% of buildings are accurately reconstructed as 3D models from 2D images. This enables address-level results rather than statistical extrapolations and provides every district in Germany with a concrete assessment.

GreenSketch will be exhibiting at Intersolar Europe 2026 at booth A3520.


Partner statements

"For many people, a rooftop is still seen simply as part of a building. This report demonstrates that it can also be a valuable energy asset. The findings show that residential solar remains economically attractive across Germany and underline the importance of self-consumption. Battery storage and intelligent energy management can help homeowners make more effective use of the electricity they generate and increase the long-term value of their investment," said Nadine Bütow, Head of Communication, LONGi Solar (DG).

“In economically and politically uncertain times, many people are asking themselves whether investing in a PV system with battery storage is still worthwhile. This report provides a clear answer: yes. It shows that solar energy generated on one’s own roof is not only a contribution to the energy transition, but also an economically attractive investment for private households. Those who generate, store and consume their own electricity can reduce their energy costs over the long term, become less dependent on rising electricity prices, and increase the energy-related attractiveness of their property. Battery storage systems play a key role in this: they increase self-consumption, improve the economic viability of the system, and can shorten the payback period.”, said Michael Gutwein, Solution Manager DACH, GoodWe Europe GmbH.


About the partners

The German Rooftop Valuation Report was created in collaboration with strategic partners GoodWe and LONGi Solar. Additional partners supporting GreenSketch’s launch in Germany include Anker Solix, Antai, Astronergy, Fox ESS, and Hoymiles.


About GreenSketch

GreenSketch is a full-stack, AI-driven solar industry ecosystem platform. Developed by OSW Group, it is the world’s first free, end-to-end solar and battery design platform created for solar professionals, connecting the industry with homeowners, installers, and leading solar brands with unprecedented speed, intelligence and transparency. From rooftop mapping, battery system layouts, to instant quotes, GreenSketch supports lead generation to enhance efficiency across the clean energy industry.
Internet: https://greensketch.ai


About the OSW Group

Leveraging over a decade of experience and digital expertise, OSW has built a fully integrated one-stop platform for distributed solar smart energy solutions under its One Simple Way philosophy. The OSW ecosystem offers services spanning system design, product sales, carbon trading, and commercial Virtual Power Plant (VPP) software, streamlining operations and increasing efficiency for the entire industry.
Internet: https://osw.energy


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Caption: The "German Rooftop Valuation Report": the first AI-powered study to have individually assessed all 28 million owner-occupied rooftops in Germany
© GreenSketch

https://www.iwrpressedienst.de/bild/osw/84e57_GreenSketch_RanglisteBundeslaender-230626.jpg
Caption: Study reveals a pronounced regional performance gap: Bavaria leads, Berlin ranks last
© GreenSketch


Munich, 23 June 2026


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