Prices on shares in selected power companies and in companies with largetrading activity in electricity:December 21COMPANY Latest close Change % VolumeSTOCKHOLM (SEK)Arise Windpower 43,00 0,94 54 448Eolus Vind 42,00 -0,94 14 815Holmen 224,30 6,05 3 465Stora Enso 68,35 4,35 43 391COPENHAGEN (DKK)Vestas Wind Systems 180,50 3,68 1 207 294HELSINKI (EUR)Fortum 22,25 0,77 1 146 128Stora Enso 7,62 4,81 25 290OSLO...