New DNV Standards Aim to Bring Order to Floating Solar’s Fast Expansion

Floating solar is growing up

Floating photovoltaic projects have expanded quickly in recent years, moving from niche installations on sheltered water bodies toward larger systems expected to operate for long periods under more complex environmental conditions. That growth has created a straightforward problem for developers, insurers, and asset owners: the industry needs clearer engineering rules for platforms that must endure wind, waves, corrosion, ultraviolet exposure, and years of mechanical stress while carrying power-generating equipment.

DNV, the Norwegian classification society and energy advisory firm, is trying to fill part of that gap with two newly published guidelines focused specifically on floating solar. The documents address two of the most failure-sensitive parts of any floating PV project: the floats themselves and the systems that keep an array in place.

Two standards, two core risks

The first document, DNV-ST-C108, covers the structural design of floats for floating PV systems. According to DNV, the standard defines technical requirements for the design and qualification of floating structures and takes a consequence-based approach that considers what could happen if a float fails. That matters because a damaged or degraded float is not just a maintenance issue. In a large array, float failure can cascade into module misalignment, cable stress, safety hazards, and long-term operational losses.

The standard includes requirements around safety classification, design basis, material qualification, structural design, testing, and corrosion protection. DNV says it places particular emphasis on non-metallic materials and on degradation caused by solar irradiation. That focus reflects the reality of floating PV design: many systems rely on polymers and other materials whose long-term performance can vary significantly depending on temperature, water chemistry, and prolonged ultraviolet exposure.

The second document, DNV-ST-E309, addresses mooring and station-keeping systems. In practice, this is the discipline that determines whether a floating solar plant stays where it is supposed to stay and behaves as expected under changing loads and environmental conditions. Anchoring mistakes, poor load assumptions, or inadequate station-keeping design can turn a power asset into a drifting mechanical problem.

Why these rules matter now

Floating PV has often been sold on a compelling set of advantages. It can preserve land for other uses, reduce water evaporation in some settings, and potentially improve panel performance through cooling effects near the water surface. But scaling those benefits requires confidence that systems will survive in the field for the full life of a project.

That confidence is not automatic. Floating solar sits at the intersection of solar engineering and marine or near-marine engineering, which means it inherits risks from both. The modules and electrical systems face the same pressure for reliability as land-based solar, while the platform and anchoring systems must contend with hydrodynamics, materials fatigue, and environmental variability that utility-scale solar developers do not always have deep experience managing.

As deployment spreads across reservoirs, lakes, industrial basins, and potentially more exposed sites, the tolerance for improvised engineering shrinks. Investors want bankability. Insurers want defined risk frameworks. Regulators want clearer safety expectations. And developers want standards that reduce ambiguity before problems appear in the field.

From pilot projects to infrastructure

The timing of DNV’s publication signals that floating PV is increasingly being treated as durable infrastructure rather than an experimental attachment to conventional solar. Standards are one of the clearest indicators that a sector is maturing. They help turn scattered project experience into repeatable engineering practice.

That does not mean standards freeze innovation. In many cases, they make innovation easier by setting a common baseline. If developers, manufacturers, certifiers, and financiers can agree on what counts as acceptable structural design, materials qualification, and mooring methodology, then new concepts have a clearer route to being evaluated on their merits.

What the guidelines appear to emphasize

From the details released so far, DNV seems to be concentrating on failure prevention through design discipline rather than offering a superficial checklist. The float standard’s attention to consequence-based design suggests an effort to rank systems by the effects of failure, not simply their components. That can push projects toward more rigorous choices where failures would have broader safety or operational impacts.

The emphasis on corrosion protection and solar-driven degradation also reflects a long-horizon view. Floating PV systems are exposed continuously, and small material weaknesses can become major asset problems over time. A standard that explicitly addresses those pathways could help the market move away from underestimating lifecycle risks.

On the mooring side, station-keeping rules are especially important because array motion affects more than location. It can influence cable wear, structural loads, maintenance access, and ultimately plant availability. In that sense, mooring is not a peripheral marine detail. It is part of the plant’s core performance architecture.

A practical signal to the market

DNV says the new documents are intended to improve the safety, reliability, and long-term performance of floating solar systems. Those three words capture the sector’s current challenge. The technology is already attractive enough to deploy. The harder task is making it robust enough to finance and operate at scale across diverse conditions.

The release of dedicated standards will not remove every uncertainty. Site conditions differ, local regulations vary, and some developers will continue pushing systems into environments that test current assumptions. But the new guidelines should give the market a more coherent starting point for design reviews, product qualification, and project due diligence.

For the broader energy transition, that matters. Floating PV is unlikely to replace land-based solar, but it does not need to. Its value lies in widening the portfolio of deployable renewable options, especially where land is constrained or water-adjacent infrastructure offers strategic advantages. Clearer engineering rules can help determine whether that promise becomes a durable slice of the power mix or remains a patchwork of uneven project quality.

In that sense, DNV’s move is less about publishing paperwork than about defining the conditions under which floating solar can grow without undermining confidence in the technology itself.

This article is based on reporting by PV Magazine. Read the original article.