Prices on shares in selected power companies and in companies with largetrading activity in electricity:April 28Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 47,50 0,85 93 271Eolus Vind 42,00 -2,33 21 825Holmen 180,00 -5,26 496Stora Enso 59,75 -4,40 16 754COPENHAGEN (DKK)Vestas Wind Systems 335,00 -4,56 3 124 219HELSINKI (EUR)Fortum 18,74 -0,90 3 241 638Stora Enso 6,19 -2,98 8 566OSLO...