Prices on shares in selected power companies and in companies with largetrading activity in electricity:April 30Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 47,80 -0,42 7 793Eolus Vind 43,50 -0,69 6 045Holmen 194,00 -1,02 241Stora Enso 60,00 -0,83 17 036COPENHAGEN (DKK)Vestas Wind Systems 342,20 2,15 2 093 063HELSINKI (EUR)Fortum 19,48 4,12 4 347 197Stora Enso 6,29 0,48 4 281OSLO...