Find the word definition

Wikipedia
Helianthos

On September 8, 2011 Nuon announced the pilot plant would be closed down since no investor for production expansion could be found. However, on May 7, 2012 Nuon announced that Helianthos has been sold to HyET Solar. It is a new company, established by a group of technological companies. HyET Solar is planning to introduce the flexible solar film on the market within short.