Prices on shares in selected power companies and in companies with largetrading activity in electricity:April 20Company Closing price Change in % VolumeSTOCKHOLM (SEK)Arise Windpower 52,75 0,00 55 855Eolus Vind 41,50 -1,19 15 450Holmen 198,00 0,00 260 020Stora Enso 58,25 0,00 8 517COPENHAGEN (DKK)Vestas Wind Systems 342,10 3,67 1 662 340HELSINKI (EUR)Fortum 18,70 0,86 1 302 903Stora Enso 5,97 1,02 6...