The MS Tûranor PlanetSolar is the world’s largest solar‑powered boat and the first vessel ever to circumnavigate the globe using only solar energy.

It is a landmark in renewable‑energy engineering and remains one of the most iconic solar-electric ships ever built.

The MS Tûranor PlanetSolar is a Swiss-built solar-powered catamaran, launched on 31 March 2010. It was created under the PlanetSolar project led by Swiss explorer Raphaël Domjan.

Its name ‘Tûranor’ comes from J.R.R. Tolkien’s The Lord of the Rings, meaning ‘Power of the Sun.’

Key Technical Facts:

Type: Solar-powered catamaran. Length: 31 m (35 m with solar panel flaps extended). Beam: 15 m (23 m with flaps). Solar array: ~512–537 m² of photovoltaic panels (sources vary slightly).

Peak solar power: Up to 93 kW. Battery bank: 8.5‑ton lithium‑ion system. Motors: Four permanent‑magnet electric motors (up to 60 kW each). Cruising speed: ~5 knots. Max speed: ~9–10 knots. Crew: Typically, 4

Historic Solar Circumnavigation

PlanetSolar became the first solar-electric vessel to sail around the world, departing Monaco on 27 September 2010. It returned on 4 May 2012 after 584 days and 32,410 nautical miles. This achievement is recognized by Guinness World Records.

The voyage demonstrated:

The viability of long-distance solar maritime travel, The durability of large-scale marine solar arrays, The potential for zero-emission oceanic transport

Construction and Project Background

Built by Knierim Yachtbau, Kiel, Germany for €15 million. The primary financier: German entrepreneur Immo Ströher. Its purpose: To promote renewable energy and demonstrate solar-powered navigation

Later Life of the Vessel

After 2025, the ship was renamed Porrima P111 and relaunched in Kaohsiung, Taiwan. It continues to be used in sustainability and environmental research missions.

Why It Matters

The MS Tûranor PlanetSolar remains a milestone in Clean maritime technology.  Solar engineering. Public awareness of renewable energy. Experimental vessel design

It proved that a large vessel can operate entirely on solar power, even across oceans.

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