TEAG Thüringer Energie AG is a German energy provider headquartered in Erfurt, Germany. The company supplies electricity, natural gas, and district heating to over 500,000 private households, business customers, industrial companies, and municipal utilities across Germany, primarily in Thuringia. Additionally, through its subsidiaries, TEAG operates extensive electricity, natural gas, and fiber optic networks, and provides various energy-related services and telecommunications solutions.