Prices on shares in selected power companies and in companies with largetrading activity in electricity:May 7Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 45,40 3,18 276 511Eolus Vind 39,60 -3,42 23 582Holmen 183,00 -1,08 280Stora Enso 54,25 -2,25 37 621COPENHAGEN (DKK)Vestas Wind Systems 292,30 -4,35 2 162 818HELSINKI (EUR)Fortum 17,87 -2,78 5 007 821Stora Enso 5,63 -2,43 15 334OSLO...