First off, I think that the viability depends on the country where it is being instigated and the electricity network in the country. Green energy has less need for a centralised system than say nuclear, where small reactors are not a great idea.
If countries such as the UAE / Saudi invested in the technology they would be able to reduce their need for other forms of power; such places have the double bonus of not only producing electricity, but reducing the need for air conditioning which uses masses of electricity.
The cost is great at the moment, but with increased research and volume of production this will decrease. This of course is true of all forms of green energy.
Reducing the need for energy supplies from areas of the world that is energy rich is of course another important factor to bear in mind.
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