Hybrid energy and propulsion system
Silent at anchor, electric underway, decarbonized at sea, a fully integrated hybrid-electric system engineered for yachts from 40 to 120 feet.
A solution chosen by the world's leading shipyards
Hours of operation
Vessel range
Vessels in service
A NEW WAY OF SAILING
Silence, comfort, smart energy
JOOOL engineers integrated energy and propulsion systems that redefine what onboard power means. By storing more energy on board, yachts can operate silently at anchor, manoeuvre in full electric mode, and reduce, or eliminate, reliance on generator sets.
The result: quieter nights, cleaner anchorages, and a
more efficient yacht at sea.
Built on nearly 30 years of marine energy expertise through Alternatives Energies, JOOOL combines industrial reliability with the precision and refinement that modern yachting demands.
Our plug-and-play OneBox architecture is the platform of choice for shipyards integrating hybrid systems at scale, from 40-foot monohulls and multihulls to 120-foot custom builds.
THE ONEBOX CONCEPT
One ecosystem, two configurations
The JOOOL OneBox is the heart of every hybrid-electric system we build. Modular, pre-assembled, and factory-tested, it centralizes energy production, storage, conversion, and distribution in a single plug-and-play architecture.
01
OneBox Energy :
Energy management & massive battery storage
Enables silent mooring, reduces generator runtime and powers large consumers at anchor : up to 152 kWh of onboard storage, with BMS and EPMS integrated for full energy conversion, distribution and management. Compatible with any motor yacht, catamaran or sailboat keeping its thermal engine, from 40 to 120 feet.
02
OneBox Propulsion :
Electric propulsion & energy management
Integrates silent sailing, electric propulsion and hydrogeneration under sail with the same energy management and storage capacity as the OneBox Energy. All power flows managed within a single unit. For sailing vessels from 40 to 65 feet.
What makes it different
Plug & Play
Standardized connectors, no specialist electrical engineering required on the vessel. Ready to drop into a production line.
Maximum safety
HVIL circuit, integrated BMS, automatic fire suppression on battery packs, IP-rated enclosures on every component.
One standard
The same system integrates into every vessel. One configuration, replicated identically across the entire shipyard fleet.
Service network
Worldwide network of certified technicians ensures installation support, maintenance and after-sales service.
FOR SHIPYARDS
Designed for standardization, built for scale
Why shipyards choose JOOOL:
JOOOL's OneBox architecture is engineered specifically for shipyard integration.
Pre-assembled, factory-tested, and validated,
our systems reduce installation time, eliminate on-site certification complexity, and deliver consistent quality across every unit in your production run.
Already trusted by: Fountaine Pajot · Leopard Catamarans · Dufour · Jeanneau · Excess · Beneteau
Plug-and-play modules designed for fast deployment, with no specialist electrical certification required on site
One streamlined process applied consistently across all hull types
Factory pre-wired and fully tested before delivery to minimize on-site work
Compliant with HVIL, IMD, CE, and IP68/IP69 standards
Commissioning, crew training, and access to a European service network included
Continuous performance tracking with over-the-air EPMS updates after delivery
THE ONBOARD EXPERIENCE
Every moment on the water, reimagined
Silent mode
Lighting, refrigeration, air conditioning, everything runs seamlessly without starting the generator.
No noise. No vibration. Just the sound of the sea.
Home comfort, anywhere
Hot showers, fresh laundry, gourmet meals, remote work. JOOOL delivers seamless, silent energy to every part of your life onboard, from the galley to the nav station.
Full energy autonomy at seaSmooth, confident handling
Instant torque at any speed. Silent propulsion in harbour. Precise manoeuvring in tight spaces, without the vibration, noise, or exhaust of a diesel engine.
Electric maneuverability & performance
Silent mode
Lighting, refrigeration, air conditioning, everything runs seamlessly without starting the generator.
No noise. No vibration. Just the sound of the sea.
Home comfort, anywhere
Hot showers, fresh laundry, gourmet meals, remote work. JOOOL delivers seamless, silent energy to every part of your life onboard, from the galley to the nav station.
Full energy autonomy at sea
Smooth, confident handling
Instant torque at any speed. Silent propulsion in harbour. Precise manoeuvring in tight spaces, without the vibration, noise, or exhaust of a diesel engine.
Electric maneuverability & performanceREADY-TO-USE
Plug & Play integration
Battery Pack
A unit that enables energy conversion and distribution
for your boat.
Learn more
OneBox
A unit that enables energy conversion and distribution
for your boat.
Learn more
Electric Drive
Electric motor for reliable, silent,
and sustainable propulsion.
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Throttle
Precision control for electric & hybrid propulsion systems.
Learn more
EPMS
An intelligent onboard computer
to optimize energy management.
Learn more
Battery Pack
A unit that enables energy conversion and distribution
for your boat.
Learn more
OneBox
A unit that enables energy conversion and distribution
for your boat.
Learn more
PowerPod
Electric motor for reliable, silent,
and sustainable propulsion.
Learn more
Throttle
Precision control for electric & hybrid propulsion systems.
Learn more
EPMS
An intelligent onboard computer
to optimize energy management.
Learn more
THE COMPLETE SYSTEM
Every component for one ecosystem
PROVEN AT SEA
119 vessels, every ocean
From production sailboats and catamarans to custom yachts, JOOOL systems are proven across a wide range of hull types, sizes, and sailing profiles. Each integration is tailored, each system is tested.
HYBRID LEOPARD 46
Integrated electric propulsion for performance
- 2 x 25 kW Electric Drive
- 2 × 32 kWh Battery Pack
- 14 kW Genset
Silent electric cruising in harbour, instant torque for tight manoeuvres, full energy self-sufficiency under sail. The JOOOL system transforms the Leopard 46 into a genuinely hybrid-electric catamaran.
HYBRID DUFOUR 48
Long-range hybrid monohull
- 25 kW Electric Drive
- 32 kWh Battery Pack
- 14 kW Genset
Built for extended ocean passages, the Dufour 48 with JOOOL runs all hotel loads silently from battery storage, motors emission-free in port, and recharges through solar and hydrogeneration at sea.
HYBRID FOUNTAINE PAJOT FP44
Refined approach to hybrid cruising
- 2 x 25 kW Electric Drive
- 2 x 27 kWh Battery Pack
- 14 kW Genset
Integrated with the JOOOL hybrid electric solution, the FP44 benefits from advanced energy management, electric propulsion, and optimized energy production.
WHY HYBRID-ELECTRIC ?
The best of both worlds
Full electric is silent and clean: but requires large battery banks and careful energy management. Diesel is reliable, but loud, polluting, and increasingly out of step with modern sailing. JOOOL’s hybrid-electric architecture gives you both: electric-first propulsion with the confidence of a thermal backup, only when you need it.
| Feature | Traditional diesel | JOOOL hybrid-electric |
|---|---|---|
|
Propulsion
|
Diesel only | Electric-first hybrid : diesel backup on demand |
|
Energy storage
|
Minimal (starter battery) | High capacity : up to 150 kWh onboard |
|
Genset use
|
Frequent : day and night | Occasional : only when batteries are low |
|
Noise at anchor
|
Generator running | Silent : batteries power everything |
|
Maintenance
|
High : engine hours accumulate | Significantly reduced : fewer moving parts |
|
CO₂ footprint
|
High | Substantially reduced |
|
Onboard experience
|
Vibration + exhaust + noise | Silent, smooth, emission-free |
WHY HYBRID-ELECTRIC ?
The best of both worlds
JOOOL designs and integrates electric and energy systems that make vessels more autonomous, more efficient and less dependent on fossil fuels. From massive battery storage and silent mooring with the OneBox Energy, to full electric propulsion and hydrogeneration with the OneBox Propulsion, each system is engineered for seamless integration into the vessel’s existing architecture, from 40 to 120 feet.
Every JOOOL component has been refined through decades of real-world marine deployments by Alternatives Energies: in harbours, on ocean passages, aboard commercial ferries, and on the world’s most demanding sailing yachts.
Founded:
La Rochelle, France
Ready to electrify your yacht?
Whether you're a shipyard integrating hybrid systems into a production range, or a boat owner looking to upgrade, the right configuration depends on your vessel, your usage and your goals.
For shipyards & professionals
Integration specs, certification support, commissioning timeline and production line compatibility.
For boat owners & sailors
System sizing, compatible models, storage capacity and retrofit options for your vessel.
