The green energy contracts mean the city will use 100 per cent renewable electricity for the next 20 years. 

The bank has agreed with green energy retailer Bullfrog Power to buy the majority of the electricity produced by the project to be designed and built by BluEarth Renewables of Calgary.

Panellists at a wind energy conference in Calgary say Alberta is still the best place in Canada to build renewable power projects despite the United Conservative government's decision to unplug the previous NDP regime's project auctions.