RWE npower plc (trading as npower) is a UK-based electricity generator and supplier of gas and electricity to homes and businesses formerly known as Innogy plc. As Innogy plc it was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index. In 2002 it was acquired by RWE of Germany and was subsequently renamed RWE npower plc. It is considered as one of the Big Six Energy Suppliers which dominate the gas and electricity market in the United Kingdom. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Company