(Refiles to correct tense in 4th bullet)
** Shares of Canadian power firm up 3% at C$9.15 in afternoon trade
** Company increases free cash flow (FCF) forecast to between $350 mln and $380 mln from $300 mln - $340 mln
** Says the expected increase in FCF is mainly attributable to continued strong performance of its energy marketing segment in Q4
** Reaffirms its comparable EBITDA forecast for the year-ending Dec. 31, 2019 to $875 mln - $975 mln
** Stock up ~64% so far this year (Reporting by Shradha Singh in Bengaluru)
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