Headquartered in Gelsenkirchen, Germany, E.ON Anlagenservice GmbH (EAS) provides planning and maintenance services for a range of energy-plant technologies and systems in five main business areas: steam generation, mechanical engineering, process plant technology, electrical engineering, and instrumentation and control. The company's manufacturer-independent expertise across these areas enables it to provide its customers with flexible on-site support for internal plant audits, TÜV inspections and certification, and repair and maintenance work. EAS also provides services to customers located in neighboring European countries.

The company's central engineering workshop in Gelsenkirchen specializes in the repair of time-critical parts and power plant components and can also custom-build parts and components that are no longer available on the market. EAS's customer base includes owners and operators of conventional power stations, nuclear and hydroelectric power stations, energy infrastructure and manufacturing plants from a wide range of industries.