One of the most significant things holding back development of electricity is the long lead time for project approval. A hydro plant, if you talk to industry—the Canadian Hydropower Association, for example—takes significantly longer than putting in a gas plant. It could take up to 10 years to get through the environmental assessment process from start to finish for a hydro dam, while in the past it was gas, although with the new timelines for environmental assessments, that will accelerate.
On April 18th, 2013. See this statement in context.