DONG Energy DONG Energy is Denmark's leading energy company. Garrad Hassan GL Garrad Hassan (GH) is one of the world's leading wind energy consultants. GH also consults in offshore wind, marine renewables, and solar energy. GH was founded in 1984 by Dr. Andrew Garrad and Dr. Unsal Hassan and has since grown to have about 750 employees with offices in 18 countries. The company has acted as the Independent Engineer for lenders and investors in more than 21,000 MW of wind projects and has carried out energy assessments for over 80,000 MW.