Since 2012 Horus-Energia has been developing the technology for the hydrogen fuelled industrial gas engines. First three units were commissioned in 2014 and in 2019 reached the forty thousand running hours milestone. The success of the first hydrogen project encouraged Horus-Energia to focus on further developments and improvements of the technology. Several R&D projects have been carried out since 2016 and resulted in two granted patents and another ones currently processed. The recent development project, carried out together with PGNiG Grupa Orlen, is in its final stage. The technology being developed creates a solid base for many new solutions that will cover wide range of fuels and applications. The paper reports experience from 40.000 hrs operation of the hydrogen fuelled industrial gas engines and presents the developments carried by Horus-Energia with its research partners as well as the future development paths for the technology.