Prices on shares in selected power companies and in companies with largetrading activity in electricity:May 4Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 46,90 -1,06 67 784Eolus Vind 42,50 -0,70 24 177Holmen 185,00 -0,80 1 100Stora Enso 59,25 -2,47 26 736COPENHAGEN (DKK)Vestas Wind Systems 324,30 -5,70 1 860 689HELSINKI (EUR)Fortum 18,95 -1,97 3 145 683Stora Enso 6,11 -3,48 28...