Wattlab, a specialist in solar power for shipping, has demonstrated through the successful application of its Solar Flatrack system on seagoing vessels that solar energy can be a practical and scalable part of onboard energy supply—particularly for the vessel’s hotel load. After two pilot projects and a first full-scale installation on a coaster, the results confirm that the system performs reliably at sea and directly contributes to fuel savings and emission reductions. #### From Pilot to Practice In collaboration with TNO and shipping company Vertom, the system was tested on the *Vertom Anette*. The insights gained were subsequently applied to the *Vertom Tula*, where 44 Solar Flatracks reduce approximately 20% of the onboard hotel load. The project was co-financed by the European Union’s Just Transition Fund (JTF), part of the European Green Deal towards climate neutrality by 2050.…