A small rooftop pilot puts bonded lightweight solar under corporate scrutiny

Portugal’s energy company Galp has installed a small pilot array of lightweight photovoltaic modules from SunOyster Systems, a German SME backed by the European Innovation Council. The pilot, comprising 24 modules rated at roughly 9 kWp, is mounted on a Lisbon rooftop and is being monitored for power generation. The agreement emerged after an EIC Corporate Day held in Lisbon on 17 to 18 July 2024, where Galp screened 15 EIC-backed companies from 11 countries for solutions aligned with its decarbonisation objectives.

For SunOyster, the hook is straightforward. Many of Galp’s facilities, notably service stations and older commercial buildings, face load limits or roof constructions that complicate conventional solar. By bonding lightweight modules to the surface rather than using ballast or roof penetrations, SunOyster aims to open otherwise off-limits rooftops. The company says its design reduces installation complexity and downtime. Whether those gains hold up across varied sites and over an asset lifetime is what Galp’s monitoring now seeks to determine.

What was agreed and what it is not

The parties opted for a straightforward pilot rather than a long procurement cycle. According to SunOyster’s Head of Sales, Amelie Krahl, preparation for the EIC event was supported by the EIC team, and subsequent negotiations for the pilot were direct. Galp is evaluating energy yields to inform any decision about scaling to more rooftops, especially service stations. So far, neither side has released performance data, cost benchmarks, or a timeframe for potential rollout. In other words, this is a validation step, not a guaranteed expansion.

Why lightweight and bonded PV targets a persistent rooftop gap

Across Europe, a large share of commercial and industrial buildings have reserve structural capacity that is marginal for conventional photovoltaic arrays. Traditional systems often rely on mechanical fixings that penetrate the roof or on ballasted frames that add substantial weight. In fuel retail forecourts and older logistics facilities, these approaches can trigger expensive reinforcement or be ruled out entirely. Lightweight bonded modules attempt to sidestep both challenges by adhering directly to the roof skin.

The pilot and the product roadmap

The pilot in Lisbon consists of about 9 kWp of SunOyster’s lightweight modules with a glass front that can be glued to the roof. While current performance data are not public, SunOyster has already pitched Galp on its next-generation premium module PVbondi, which it says improves yield and water, UV, and fire protection. Claims of higher yield merit careful review of test conditions, thermal behavior on low-tilt surfaces, and soiling patterns typical of bonded rooftop installs.

From match to pilot: the EIC Corporate Day pathway

The deal traces back to the EIC Corporate Day in Lisbon where Galp convened one-to-one meetings with 15 preselected EIC-backed startups and scale-ups focused on reducing, avoiding, or removing CO2 emissions. The EIC provided preparatory support and curated networking designed to catalyse pilots. Galp’s Director of Innovation, Ana Casaca, characterised the format as a filter for practical solutions and a way to translate external innovation into operational learning with lower execution risk.

The EIC frames this as part of a broader Corporate Partnership Programme. Since 2017, it reports over ninety Corporate Day initiatives with more than one hundred corporate partners and over a thousand participating EIC-funded startups. The programme highlights deal flow and follow-ups, but like most matchmaking initiatives its impact metrics are self-reported and not broken down by sector, ticket size, or long-term adoption rates. Independent evaluation of conversion from pilot to scaled procurement remains limited.

Evidence beyond Galp and questions that remain

SunOyster points to additional traction. The company says Portuguese utility EDP implemented a project using its lightweight modules, and that interest from Germany includes a facade installation for industrial firm SKF. SunOyster also markets solar trackers, but the Galp collaboration is focused on lightweight bonded rooftop modules. None of the referenced projects are accompanied by disclosed performance datasets or third-party certifications in the material provided here, so validation still hinges on real-world monitoring and due diligence by site owners.

What procurement and compliance teams will scrutinise

Adhesive-bonded solar offers a credible route to unlock constrained roofs, but uptake depends on more than weight. Corporate facility managers typically require wind uplift tests for the specific roof membrane, local fire classification, proven durability under UV and thermal cycling, warranty compatibility with roofing suppliers, and a clear maintenance plan. In service station contexts, operators scrutinise electrical safety, emergency access, and business continuity risks during installation and operation. These checkpoints often determine whether a pilot advances to a framework agreement.

Context in Europe’s distributed solar push

The EU’s policy environment is broadly supportive of rooftop solar through national incentives and simplified permitting in some markets, yet structural and regulatory realities often slow execution. Lightweight bonded PV could lower these frictions on marginal roofs where reinforcement is uneconomical. For energy retailers like Galp trying to decarbonise service stations and retail networks, each site is an edge case with its own structural data, membrane type, and local rules. That complexity partly explains why many networks still have underutilised roof area.

Statements from the parties

Amelie Krahl, SunOyster: Participation in the EIC Corporate Day with Galp began with careful preparation of our presentation with great support by the EIC team. We presented our lightweight PV modules with a glass front that can be easily glued without penetrating the roof. Galp liked the cost-efficient solution for load-restricted and other difficult roofs, having set up a meeting with SunOyster to further assess the modules and feasibility of a pilot. Negotiation of a pilot project was straightforward. After the installation, Galp is currently evaluating the modules’ power generation. As we expect positive results as in our other projects, we want to roll out the solution to many other roofs, in particular on their gas service stations.

Ana Casaca, Galp: The EIC Corporate Partnership Programme provides high-quality curation that enables corporates to focus on solutions with real business potential, rather than on exploratory noise. Through the collaboration with SunOyster, Galp is validating a lightweight PV solution for constrained environments, translating external innovation into concrete operational learning. This approach supports informed business decisions, reduces execution risk, and contributes pragmatically to the strengthening of the European innovation ecosystem and the acceleration of the energy transition.

About the organisations and the programme

SunOyster Systems is a German SME focused on advanced solar technologies. The company markets lightweight PV modules designed for low load roofs and also sells dual-axis solar trackers. It states that its lightweight modules can be bonded to roofs or mounted on facades, and that power output is close to standard high performance modules despite lower mass.

Galp is a Portuguese energy company with operations across Portugal and other markets. Its infrastructure footprint includes many roof types where weight and installation constraints are common, making lightweight PV a strategic area to test. The pilot in Lisbon is intended to provide real operational metrics to inform any broader deployment decision.

The EIC Corporate Partnership Programme aims to bridge EIC-backed startups with large European corporates through curated Corporate Days and multi-corporate events. Since 2017, the programme reports more than ninety such initiatives with over one hundred corporate partners, facilitating thousands of one-to-one meetings and more than one hundred business deals. Participation satisfaction is reported as high, but figures are compiled by programme operators and are not independently audited.

What to watch next

Key indicators of substance will include Galp’s published findings from the Lisbon pilot, any transition to framework procurement, third-party certifications for the bonded modules on common roof membranes, and clarity on total installed costs and lifecycle maintenance. On the programme side, stronger transparency on conversion rates from pilot to multi-site deployment would help the EIC benchmark impact beyond matchmaking outputs.

Data and claims at a glance

Bottom line

The Galp–SunOyster engagement illustrates how curated corporate–startup matchmaking can move quickly to a real pilot. It also underscores how small pilots are necessary but insufficient proof points for scale. Lightweight bonded PV may open otherwise unusable rooftops if it meets stringent durability, safety, and warranty criteria at competitive cost. Until Galp publishes data or proceeds to multi-site procurement, the practical impact remains a promising hypothesis rather than a confirmed pathway to fleet-wide deployment.