Tidal energy is a new realm of renewable energy. As technology advances, GL Renewables Certification (GLRC) is contributing its expertise by certifying Alstomâs tidal turbine prototype. Certification of tidal turbines is one of the key development areas for the tidal industry in the future, and represents a major milestone for Alstom on the REDAPT project. GL RC and Tidal Generation Limited (TGL, now rebranded Alstom) have worked closely together to achieve âC-Design Assessmentâ certification for Alstomâs full-scale 1MW tidal turbine. âThe certification was carried out according to our Guideline for the Certification of Ocean Energy Converters,â said Andreas Schroeter, Managing Director GL Renewables Certification.