Greenline Yachts didn’t just decide to unveil a new fleet member at the Monaco Yacht Show (MYS), but rather an entire brand.

The team behind the Slovenian shipyard launched GX Superyachts at the prestigious event this week, adding another major player to the world of sustainable yachting. The new GX range will include custom aluminium hybrids that range from 78 to 164 feet. Greenline has been making high-tech hybrids measuring up to 58 feet for over 15 years, but GX will expand further into superyacht territory.

Marking something of a full circle moment, the Greenline team got the idea for the new brand at the MYS in 2018. The story goes that Prince Albert II of Monaco fell in love with the yard’s electric 33-footer and even requested an escort to the Monaco Yacht Club in the yacht. That high praise pushed the Greenline team to scale their green tech for the superyacht sector.

Each GX cruiser will feature a cutting-edge hybrid propulsion system, a highly efficient hull, and a large solar array. The hybrids will be able to seamlessly switch between diesel and electric power, allowing seafarers to cruise leisurely sans emissions or tear it up at speed. “At six knots in electric mode, these yachts can achieve an incredible range of up to 100 nautical miles,” Greenline CCO Luca Raumland said in a statement. “In diesel mode, they can cross the Atlantic at 12 knots, while the max range is 11,571 nautical miles at six knots”

The GX superyachts will produce 40 per cent fewer carbon emissions than conventional diesel-powered vessels, according to Greenline. Each yacht will also be fitted with solar panels and a large lithium battery bank that together will offer enough green energy to power the hotel load silently and cleanly for 48 hours or more, the yard says.

Penned by Marco Casali of Too Design, the GX lineup is characterised by sleek lines and sporty profiles. All models will come in two variants: The Coupé features a long, curved superstructure and a roof that slides open at the touch of a button to reveal a sundeck with a jacuzzi and bar, while the Raised Pilot House (RPH) version showcases a large flybridge and spacious living areas. Both options have vast beach clubs with fold-down wings and hydraulic swim platforms.

GX has already reeled in a customer, too. The yard is in the process of constructing a 138-footer for an existing Greenline client. (As the GX models are too big for Greenline’s Slovenian yard, the fleet will be built in partnership with SES Yachts of Tuzla, Turkey.) The stylish new GX42 RPH will showcase leatherwork by Foglizzo, natural wood flooring by Cadorin, and furniture by Poltrona Frau and Rugiano. With 50 per cent of the hull already complete, the yacht is expected to hit the seas in summer 2026.

Click here to see the GX Superyachts lineup.