Sustainability in the yachting industry is no longer defined by bold promises or concept-stage ideas. It is increasingly measured, verified and, crucially, operational. For crew managing day-to-day operations, the announcement that Nanni Industries has joined the Superyacht Eco Association (SEA) Index® as an official Ally signals a shift toward practical tools that can help meet environmental standards without compromising performance or reliability.
What Is the SEA Index®?
Established by the Yacht Club de Monaco and Credit Suisse (UBS Group), the SEA Index® has become the most credible benchmarking tool for sustainable practices in yachting. It provides a transparent framework for assessing the environmental impact of superyachts over 24 meters and has recently expanded its scope to cover those starting from 10 meters. Using a third-party certified and scientific methodology, the SEA Index® toolkit assesses both CO₂ and air quality with key pollutants (NOx and PM) for a broader greenhouse gas picture of a vessel’s impact. But beyond the data, its influence lies in its ability to connect stakeholders — owners, captains, shipyards and suppliers — around a shared goal: reducing environmental impact without compromising performance.
As Michele Insom, director of marketing and aftermarket business at Nanni, explains: "A yacht rated three stars or higher under the SEA Index® can enjoy several advantages — firstly in terms of consumption, but also in terms of securing privileged spaces in marinas and moorings in the SEA Index®’s partner marinas, extending from the Mediterranean coast to the Seychelles, the Caribbean and Japan, because the yacht has improved its emissions and noise levels, among other factors."
For captains and engineers, this translates to tangible operational benefits: lower fuel costs, priority berthing access, and enhanced vessel reputation — all factors that can simplify logistics and improve owner satisfaction.
Why Nanni's Alliance Matters Now
This is where Nanni's role becomes particularly significant for crew. By becoming an official SEA Index® Ally, the company is positioning its generator technologies as enablers of certification. In other words, they form part of a practical pathway for yachts aiming to meet SEA Index® criteria — and for crew tasked with implementing those changes.
Bernard d'Alessandri, SEA Index Superyacht Eco Association President and General Secretary of the Yacht Club de Monaco, frames it as part of a broader transformation: "Welcoming Nanni as a SEA Index® Ally further reinforces our collective capacity to drive meaningful and lasting transformation within the yachting industry. Innovation is no longer confined to engine manufacturers. It is now reaching equipment specialists, including generator makers such as Nanni, which is a clear sign that sustainability is permeating every layer of the maritime supply chain."
At the heart of this shift is Nanni's superyacht generator range, spanning 45 to 125 kilowatts and designed for yachts up to 60 meters. What distinguishes these systems is a suite of interconnected innovations that address emissions, efficiency and onboard experience simultaneously — all areas that directly impact crew workload and vessel operations.
Fuel Flexibility for Operational Simplicity
Fuel flexibility is perhaps the most immediate lever. Nanni's generators are compatible with hydrotreated vegetable oil (HVO), a renewable diesel alternative that can significantly reduce lifecycle carbon emissions. "For HVO, not much change is required to the engine because we are replacing diesel with a fuel that is quite similar," says Insom.
For engineers, this means minimal modifications to existing systems and straightforward integration — no complex retrofits or steep learning curves.
Alongside HVO, Nanni is advancing a dual fuel system that combines diesel with methanol — a fuel gaining traction across commercial shipping and increasingly within yachting. Methanol combustion produces lower nitrogen oxide emissions and, when sourced sustainably, offers a pathway to substantial carbon reductions. "Superyachts need a lot of energy and there's an expectation that they're always functioning, so while a thermal diesel engine is still the most reliable solution, this dual fuel technology offers the same reliability as a diesel engine but with a fuel that reduces emissions by 70 percent," Insom explains.
As part of the Life Mystic project, Sanlorenzo initiated and led the development of an innovative dual-fuel generator, aiming to accelerate the adoption of low-impact technologies in the yachting sector and to contribute concretely to the decarbonization pathway.
Quieter Operations, Better Guest Experience
Onboard comfort remains equally critical, particularly when it comes to noise and vibration — factors that crew know can make or break a charter experience. Nanni's soundless cabin technology addresses this directly, reducing generator noise by up to 10 decibels below market standards. The system combines advanced acoustic insulation materials with optimized airflow management, tackling both sound transmission and mechanical resonance.
Its real-world impact has already been demonstrated through collaborations with leading shipyards. The technology was tested as part of the Mystic Life project with Sanlorenzo, with further applications across fleets from Cantiere delle Marche and Benetti. "We conducted the successful first trial of the soundless cabin on the Sanlorenzo 72Steel, and we are achieving the same results on the new units we are supplying," Insom notes. "We are quite proud of this technology — we launched it two years ago and now we are receiving real feedback from the market."
For crew, quieter generators mean fewer guest complaints, improved sleep quality for off-duty crew, and a more comfortable working environment overall.
Smart Energy Management That Reduces Your Workload
Perhaps the most forward-looking element of Nanni's offering lies in its battery energy storage systems. These are not conventional battery packs, but intelligent systems equipped with an integrated energy management control unit. Known as Nanni BESS, the technology dynamically manages power generation and consumption across the yacht.
"This kind of battery pack is already being used to provide energy for large events like festivals and the Olympics, where local energy supply is insufficient. What we are doing is applying this technology to the marine industry," says Insom. Unlike traditional setups where generators run continuously to meet demand, the system calculates energy requirements in real time, determining when generators should operate at full capacity, run at partial load, or switch off entirely. It can even coordinate multiple generators, optimizing their usage to reduce fuel consumption, wear and maintenance.
For engineers and chief officers, this means less manual monitoring, reduced maintenance schedules, and lower operational costs — all while meeting sustainability targets that owners increasingly expect.
For Gregorio Passani, chief business officer and general manager at Nanni, the partnership represents a broader philosophy: "Joining the SEA Index® program represents an important milestone for Nanni. We believe that technological innovation must translate into measurable environmental progress, and the SEA Index® provides the scientific and operational framework needed to make this transition real. Through this partnership, we aim to provide yacht owners, captains and shipyards with effective and scalable solutions that elevate the standards of clean and responsible yachting."
By lowering emissions, improving energy efficiency and reducing noise pollution, these technologies collectively support the measurable and third-party certified criteria on which the SEA Index® is based. More importantly, they offer a scalable solution that can be applied across both new builds and refit projects — giving crew practical options whether they're commissioning a new vessel or upgrading an existing one.
What This Means for Your Vessel
If you're part of a crew considering SEA Index® certification — or if your owner has expressed interest in improving the yacht's environmental profile — Nanni's generator systems offer a proven, crew-friendly pathway. The combination of fuel flexibility, noise reduction and intelligent energy management addresses the operational realities crew face daily, while supporting the broader sustainability goals that are reshaping the industry.
To find out more information about how a generator could make your yacht SEA Index®-compliant, get in touch with Nanni Industries directly.
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