RWE AG, until 1990: Rheinisch-Westfälisches Elektrizitätswerk AG (Rhenish-Westphalian Power Plant), is a German electric utilities company based in Essen, North Rhine-Westphalia. Through its various subsidiaries, the energy company supplies electricity and gas to more than 20 million electricity customers and 10 million gas customers, principally in Europe. RWE is the second largest electricity producer in Germany, and has increased renewable energy production in recent years.[2][3]