The qualifications you need for a career in renewable energy or bioenergy depends largely on the type of job. Policy makers need a background in economics or a relevant field and communication skills. An engineer at an oil and gas company, whose duties may involve working on a research project refining ethanol, typically needs a master’s degree in engineering. Wind energy or wind turbine designers should also have a background in engineering; a wind farm turbine operator or technician, who harvests energy crops and adjusts the systems that control the farm, typically only needs a certificate or associate’s degree. Bioenergy scientists should have a bachelor’s degree in biology, chemistry, agriculture, or a similar field.