Geothermal Energy Industry Workers perform a wide range of duties, such as studying and testing sites for possible geothermal drilling, drilling geothermal wells, designing and building geothermal power plants, and operating and maintaining power plants. The U.S Bureau of Labor Statistics estimates there are approximately 5,200 jobs directly related to geothermal power and production. Many other workers, however, from geologists and biologists to lawyers, surveyors, engineers, architects, site managers, office staff, and others provide support to the industy.