Darlington Re-Build Could Cost $21 to $35 Billion: OPG is seeking permission from the Ontario Energy Board to raise its rates commencing March 2011 to start paying for the Darlington Re-Build project. According to OPG, its proposal to extend the operating life of Darlington by 30 years will cost $8.5 to $14 billion. However, as this OCAA report notes, every single nuclear project in Ontario’s history has gone over budget and the actual costs of Ontario’s nuclear projects have been 2.5 times greater than the original cost estimates