Prices on shares in selected power companies and in companies with largetrading activity in electricity:May 31Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 51,75 4,13 97 237Eolus Vind 42,50 1,68 10 911Holmen 189,00 0,53 35Stora Enso 58,75 0,43 4 634COPENHAGEN (DKK)Vestas Wind Systems 290,80 0,62 1 331 857HELSINKI (EUR)Fortum 18,42 0,99 1 631 530Stora Enso 6,10 1,84 6 033OSLO...