I thought this was very interesting - there's the map upfront, but you can also drill into individual countries and regions with some nice tables. Some "obvious" things here, though a few surprises:

* The solar potential of a gloomy, northern locale like the UK is "only" half of somewhere sunny like Australia. Though I can imagine the swings between seasons are greater.

* Northern Canada has a surprising amount of potential, compared to European regions at the same latitude