Prices on shares in selected power companies and in companies with largetrading activity in electricity:April 23Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 51,00 -1,92 132 096Eolus Vind 41,70 -0,71 19 984Holmen 194,50 0,26 250Stora Enso 61,00 0,83 27 612COPENHAGEN (DKK)Vestas Wind Systems 340,90 2,37 1 570 836HELSINKI (EUR)Fortum 18,93 0,96 2 980 748Stora Enso 6,24 1,14 12 928OSLO...