Stadtwerke Bremen AG(swb). The Group's principal activity is the supply of the Free Hanseatic city of Bremen with electricity, natural gas, water and district heat. Additionally, the Group generates electricity for Deutsche Bahn AG, the German national railway company, from top gas obtained from the steel production of Stahlwerke Bremen GmbH. The Group has domestic subsidiaries only. Electricity accounted for 39% of 2001 revenues; natural gas distribution, 34%; sewage, 9%; water distribution, 9 %; district heat supply, 6% and other, 3%.