![An aerial picture taken on May 28, 2019 shows the self-energy producing multihull \](http://www.ecns.cn/hd/2019/05/29/f7aa2ba90c1e4853884b6ab56b343cec.jpg)
An aerial picture taken on May 28, 2019 shows the self-energy producing multihull "Energy Observer" sailing off the coast of the Swedish capital, Stockholm. The high-tech catamaran, part of a project aimed at finding new solutions in favour of energy transition, is on a trip around the world during six years -from 2017 to 2022- with 50 countries expected to be visited along the way. (Photo/Agencies)
![A picture taken on May 28, 2019 shows the interior of the main cabin onboard the self-energy producing multihull \](http://www.ecns.cn/hd/2019/05/29/9a46b52e6ed148e9940af06d6512362e.jpg)
A picture taken on May 28, 2019 shows the interior of the main cabin onboard the self-energy producing multihull "Energy Observer" as it sails off the coast of the Swedish capital, Stockholm. The high-tech catamaran, part of a project aimed at finding new solutions in favour of energy transition, is on a trip around the world during six years -from 2017 to 2022- with 50 countries expected to be visited along the way. (Photo/Agencies)
![A picture taken on May 28, 2019 shows the self-energy producing multihull \](http://www.ecns.cn/hd/2019/05/29/ba56bd2858464f378f7c3d10ade6282f.jpg)
A picture taken on May 28, 2019 shows the self-energy producing multihull "Energy Observer" sailing off the coast of the Swedish capital, Stockholm. The high-tech catamaran, part of a project aimed at finding new solutions in favour of energy transition, is on a trip around the world during six years -from 2017 to 2022- with 50 countries expected to be visited along the way. (Photo/Agencies)
![A picture taken on May 28, 2019 shows the self-energy producing multihull \](http://www.ecns.cn/hd/2019/05/29/d5ac7a7bcbeb4693921fec3e3281e0b9.jpg)
A picture taken on May 28, 2019 shows the self-energy producing multihull "Energy Observer" sailing off the coast of the Swedish capital, Stockholm. The high-tech catamaran, part of a project aimed at finding new solutions in favour of energy transition, is on a trip around the world during six years -from 2017 to 2022- with 50 countries expected to be visited along the way. (Photo/Agencies)