Prices on shares in selected power companies and in companies with largetrading activity in electricity:September 20COMPANY Latest close Change % VolumeSTOCKHOLM (SEK)Arise Windpower 43,60 -0,68 399Eolus Vind 39,50 0,00 6 000Holmen 210,00 -0,10 360Stora Enso 65,50 -0,46 21 175COPENHAGEN (DKK)Vestas Wind Systems 212,30 -1,76 1 177 803HELSINKI (EUR)Fortum 19,46 0,73 1 175 787Stora Enso 7,17 0,42 7 997OSLO (NOK)Arendals Fossekompani...