Prices on shares in selected power companies and in companies with largetrading activity in electricity:August 20Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 44,50 -1,11 7 961Eolus Vind 41,00 -1,68 2 220Holmen 196,80 0,00 26Stora Enso 61,20 -3,85 17 973COPENHAGEN (DKK)Vestas Wind Systems 236,30 -2,88 2 511 721HELSINKI (EUR)Fortum 18,24 -0,87 1 995 667Stora Enso 6,46 -5,07 6 752OSLO...