RWE npower has gone to the nth degree to bring to power in the UK. The company controls the UK holdings of the former National Power, whose non-UK businesses have been organized as International Power. The integrated energy company's primary business, npower, is a retail energy supplier that serves 6.6 million electricity customers and natural gas customers. RWE npower is also an energy trader, and has a generation capacity of about 10,000 MW (primarily fossil-fueled). Other operations include engineering services and energy conservation services. Affiliate npower renewables, part of RWE Innogy, leads the UK wind power market. German multi-utility RWE acquired the company in 2002.