Prices on shares in selected power companies and in companies with largetrading activity in electricity:February 21STOCKHOLM (SEK)Arise Windpower 43,50 -1,14 3 233Eolus Vind 51,00 -1,45 14 641Holmen 231,00 -1,70 1 063Stora Enso 76,35 -0,97 24 022COPENHAGEN (DKK)Vestas Wind Systems 176,40 2,62 1 249 722HELSINKI (EUR)Fortum 22,03 1,24 2 296 253Stora Enso 8,68 -0,80 11 240OSLO (NOK)Arendals Fossekompani 1680,00 0,00 0Hafslund...