Rhenag Rheinische Energie AG – founded in Cologne in 1872 – is one of the oldest German utility companies. From the company’s original beginnings involving the creation of a modern supply infrastructure up to today’s energy transition technology, the business of energy supply has changed fundamentally and Rhenag has continually evolved alongside these changes. By continually innovating, Rhenag pursues a unique approach, combining the business of a modern regional utility plus the activities of a nationwide municipal utility cooperation partner from a single supplier. The Rhenag IT business model is important to note.