Prices on shares in selected power companies and in companies with largetrading activity in electricity:May 19Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 48,00 2,13 207 586Eolus Vind 43,00 -0,23 75 810Holmen 196,00 -2,00 350Stora Enso 58,50 -4,10 18 975COPENHAGEN (DKK)Vestas Wind Systems 298,50 -3,34 1 508 462HELSINKI (EUR)Fortum 18,10 -2,85 2 064 008Stora Enso 6,07 -3,96 6 752OSLO...