Prices on shares in selected power companies and in companies with largetrading activity in electricity:July 23CompanySTOCKHOLM (SEK)Holmen 209,50 4,75 100Stora Enso 61,25 4,26 29 607COPENHAGEN (DKK)Vestas Wind Systems 621,00 1,97 923 701HELSINKI (EUR)Fortum 26,51 -4,54 2 747 470Stora Enso 6,50 5,01 6 631OSLO (NOK)Arendals Fossekompani 1900,00 - 22/7Hafslund 108,00 1,89 201Norsk Hydro 60,90 -2,72 4 966 210Norske Skog 20,50 2,50...