Prices on shares in selected power companies and in companies with largetrading activity in electricity:December 17COMPANY Latest close Change % VolumeSTOCKHOLM (SEK)Arise Windpower 42,70 -1,16 82 491Eolus Vind 42,50 1,19 27 245Holmen 211,40 -2,89 557Stora Enso 64,95 0,70 8 694COPENHAGEN (DKK)Vestas Wind Systems 182,60 0,33 1 602 482HELSINKI (EUR)Fortum 21,57 -1,37 1 881 085Stora Enso 7,21 0,98 3 308OSLO (NOK)Arendals...