Well, viability has to to with depth and distance. Location, Location, Location.
So, practical, viable, usable space? The main thing is labor. The deeper it is, the farther out, the higher the winds, etc, all mean labor. Not just to build them. But, to keep them going.
Once you can figure out the cost benefit, then your tax dollars cover the deficit. As far as I know, wind farms are not actually break even.
They require too much parts and labor. Light wind or wind too high, they don't turn. The are locked until the wind is right for producing viable power.
So, in the USA, every mill has a tax credit attached. You can own one or 100 and lease back to the company that has 1000s. But, it's all about the the tax credit to make it work.
bah, windmills are currently considered worse than coal, except when coal is worse, or when windmills are worser still. according to our econaut buddies windmills are:
Dangerous Ice Catapaults that will slay us all with 1/2 tonne ice boulders thrown for miles across the countryside until they land in your baby's nursery at 3 am. and presumably explode?
Siezure Inducing Shadow Flicker Machines which will cause everyone who passes near one to contract a contagious form of epilepsy and spread it to their neighbors.
Deadly Subsonic Wave Generators which create unhealthy "Vibrations" which will misalign our chakras and cause depression despair suicide and psychosis
Lethal Sonic Disruptors which will slowly murder us all through a fatal overexposure to the sound of their gears and blades turning, which can be heard by deaf people 3 miles away, no really, they operate at 1000000000 decibels!
Wobbly Teetering Towers made from playing cards popsicle sticks and snot. they fall down so regularly that NOBODY has ever been killed by one, and they INVARIABLY fall on schoolbusses and churches and hospitals.
Incendiary Time Bombs that explode all the time for nor reason!
Insidious Bird Murder Devices because a few windmills in a group is invisible to birds, so they fly right into the blades, but many windmills are even more invisible to birds so they fly into the blades, but a single windmill is even MORE invisible to birds...
Destructive to the Natural Wind Patterns since they rob the wind of it's natural energy they could cause tornadoes and shit... or something...
so, no windmills allowed, we must use hydro-electric, but only large dams, except those are worse for the environment than smaller dams, which are even WORSE for the environment that large dams, which are even WORSER than small dams...
so no dams. we gotta use solar power, but you cant set up solar arrays in the desert since that brings artificial "Shade Pollution" to the desert (really, i shit you not) which will destabilize the delicate eco-balance of the deserts... and you cant set up solar arrays in the mountains cuz mountains are protected ecospheres... and solar arrays on roofs are dangerous to birds and passing aircraft which might be blinded by reflections...
so no solar panels, we gotta use nuclear power but....
youll think im shitting you but EACH if these claims has been made by the sierra clubs in california. every last one of them.