@laprice @evan depends upon the project and what your accounting for in your lifecycle analysis. Here in the northeast we are getting alot of our power from Quebec. There are real social, political and colonial concerns:
I think that it is considered a critical path for carbon emission reduction, behind only wind and nuclear:
IPCC chapter on the topic:
https://www.ipcc.ch/site/assets/uploads/2018/03/Chapter-5-Hydropower-1.pdf