I went to the Toolshed Brewery tour a couple weeks ago and was told that in Calgary the water is excellent for ales, but not good for lagers. The said Big Rock has to run their water through a reverse osmosis process to brew their lagers.
I'm not sure exactly WHY that is the case, but I can see that would be why smaller local brewers create ales.
And there must be a demand. Especially at place like National/Craft/etc where they regularly change their offerings. If there wasn't a demand for IPA then it wouldn't be on the taps very long.
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