Prices on shares in selected power companies and in companies with largetrading activity in electricity:May 20Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 48,00 0,00 52 239Eolus Vind 42,60 -0,93 28 835Holmen 195,50 -0,26 1 001Stora Enso 58,75 0,43 11 679COPENHAGEN (DKK)Vestas Wind Systems 283,10 -5,16 2 104 102HELSINKI (EUR)Fortum 17,91 -1,05 3 216 811Stora Enso 5,99 -1,40 3...