First some nitpicking: average wind speed tells you little about power output. The latter you get by a weighted average. Also, considering today's turbines which stand 80 meters or higher, the 50-m wind maps aren't a good indicator of on-shore potential (I indicated this in my own US potential calculation a month or two ago) - nor of the off-shore potential with large off-shore turbines even if placed low (say a 100 m rotor diameter turbine atop a 60 m tower).

I also note that a less enviromentally-risky alternative to pumped storage is just variable hydropower output - already practised at some places in Scandinavia.

_{*Lunatic*, n.
One whose delusions are out of fashion.}