Prices on shares in selected power companies and in companies with largetrading activity in electricity:February 21STOCKHOLM (SEK)Arise Windpower 44,00 -2,87 2 517Eolus Vind 51,75 0,00 15 852Holmen 235,00 0,43 95Stora Enso 77,10 -1,91 7 206COPENHAGEN (DKK)Vestas Wind Systems 171,90 1,96 905 356HELSINKI (EUR)Fortum 21,76 -1,00 898 149Stora Enso 8,75 -2,89 6 561OSLO (NOK)Arendals Fossekompani 1680,00 0,00 50Hafslund 70,00 0,72 917Norsk...