Bipole III line now more than $4 billion?

http://www.winnipegsun.com/news/manitoba/2011/01/31/17099976.html
The NDP haven't been saying much about the cost of this project. Now leaked documents claim this project could cost more than $4.1 billion, much higher than the original $2.2 billion quoted.
The route apparently doesn't have much to do with the increase, but the east side will obviously be cheaper.
One has to wonder why the cost has jumped as high as it has? And when did they plan to tell Manitobans - after the next election?