Areas where 90% of the population lives in Canada receive more solar radiation than Germany which is the world leading nation per capita in PV use. Regions with similar or lower sunlight and similar cold winters such as Austria and Switzerland are world leaders in use of solar water heating for combi-systems (solar space heating plus domestic water). Regions where the purchasing power is very low (China) are also very big users of solar water heating. So yes, with 3 to 5 kWh/m2/day, Canada gets enough solar radiation for solar energy to be technically possible.
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