CORRECTED-BRIEF-Century Aluminum says may not re-open Ravenswood smelter

NEW YORK, April 29 (Reuters) - Century Aluminum : * Century chief executive Mike Bless says there is "detailed proposal on the table" for power arrangement for Ravenswood, West Virginia Smelter * Appalachian Power has not committed to deal, and Bless says if this deal does not work out, Century may "conclude that we just can't get there" * 170,000-tonne-per-year smelter has been idled since 2009 as Century tries to negotiate a more favorable power deal * "We can't keep doing this forever.