On a warehouse roof outside Stuttgart, a few hundred photovoltaic panels are quietly doing something the German grid was not really designed for: selling their electrons directly to the company unloading pallets one floor below. The metering, the contracts, the per-tenant billing, and the regulatory paperwork run on software from a local company called Solarize.
Solarize, founded in 2015 and headquartered in Stuttgart, sells a SaaS platform for energy production, distribution, and billing inside commercial microgrids [Crunchbase]. The customer is the building owner who has installed solar but does not want to wholesale the power back into the grid, the utility that wants to offer on-site power-purchase agreements without building bespoke IT, and the microgrid operator juggling generation, storage, and a stack of tenants. Solarize's pitch is that an app with automation and monitoring can handle the lot, so the electricity gets sold on-site without detours [Crunchbase].
The company describes itself as a microgrid operating system, and in October 2022 it raised €4.3 million in seed funding [pv magazine Deutschland, Oct 2022] [EU-Startups, Oct 2022]. That round was earmarked for scaling solar implementations on commercial rooftops across Europe [EU-Startups, Oct 2022].
The bet
Solarize is not manufacturing panels, financing projects, or chasing residential homeowners. It is selling the connective tissue,the billing engine and tenant-facing app,that turns a rooftop array into a revenue-generating utility. Software margins on hardware-driven decarbonization is a thesis that has worked elsewhere, and Solarize is a clean expression of it on commercial real estate.
The company helps owners "upgrade real estate to a decentralized electricity future" [PitchBook]. It provides a single piece of software that lets a building owner bill ten different tenants for ten different consumption profiles from one shared solar array, while staying on the right side of German energy law. Germany's Mieterstrom (tenant electricity) framework is paperwork-heavy, and the regulatory complexity is why a SaaS layer can charge for itself.
Why it could be big
EU member states are pushing rooftop solar mandates on new commercial construction. German industrial electricity prices remain among the highest in the OECD, making self-consumption the most valuable kilowatt-hour a building owner can produce. The underlying physical asset, a commercial PV system, has collapsed in cost over the past decade while the software around it has barely moved.
| Round | Date | Amount | Use of funds |
|---|---|---|---|
| Seed | Oct 2022 | €4.3M (~$4.73M) | Scale commercial rooftop deployments across Europe [EU-Startups, Oct 2022] |
The team and traction
Solarize operates as Solarize Energy Solutions GmbH out of Stuttgart [Startbase], with team members including Andi Weiß listed publicly on LinkedIn [LinkedIn]. The company has been building since 2015, spending roughly seven years on product and early customers before taking institutional money. The 2022 round was reported by German trade press [pv magazine Deutschland, Oct 2022] and the broader European startup press [EU-Startups, Oct 2022] [TheSaaSNews], and the company is actively hiring through its careers page.
The honest counterfactual
The bear case is that energy management software for commercial PV is a crowded category in Europe, with incumbents and well-funded peers building adjacent products. The bull answer, supported by the company's own positioning [Crunchbase] and the trade press coverage of its microgrid operating system [pv magazine Deutschland, Oct 2022], is that Solarize has spent the better part of a decade specifically on the billing-and-tenant-relationship layer that general energy management platforms tend to treat as an afterthought. In a regulatory regime as specific as Germany's, depth often beats breadth.
What to watch
The next twelve months should reveal whether Solarize can convert a respectable seed round into a Series A story. The questions are concrete: how many commercial sites are live on the platform, what is the gross retention on landlord accounts, and does the product travel cleanly into Austria, Switzerland, and the Netherlands? A second round would be the cleanest signal that the unit economics on the rooftop are translating into the unit economics of the SaaS contract.