Prices on shares in selected power companies and in companies with largetrading activity in electricity:January 20COMPANY Latest close Change % VolumeSTOCKHOLM (SEK)Arise Windpower 44,00 -1,57 7 555Eolus Vind 43,70 -0,68 40 491Holmen 233,50 -0,64 258Stora Enso 79,20 -0,38 25 659COPENHAGEN (DKK)Vestas Wind Systems 182,00 -3,09 1 008 483HELSINKI (EUR)Fortum 22,36 -0,67 2 046 084Stora Enso 8,80 -1,46 10 148OSLO (NOK)Arendals...