Prices on shares in selected power companies and in companies with largetrading activity in electricity:May 18Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 47,00 -0,42 4 767Eolus Vind 43,10 1,41 431 460Holmen 200,00 3,09 541Stora Enso 61,00 4,27 8 909COPENHAGEN (DKK)Vestas Wind Systems 308,80 1,65 1 015 749HELSINKI (EUR)Fortum 18,63 1,42 1 746 561Stora Enso 6,32 3,02 33 905OSLO...