But what your proposing to do is ruin a huge amount of wild land, which surely goes against one of the main reasons for wanting renewable energy in the fiest place!!!
Why not just stick lots of small solar panels by roads/on the roofs of buildings - there is no need to lump everything into one space and make it stand out as a massive symbol of modern engineering.
The issues not as such collecting the energy [although im sure the likes of Exonn, BP etc. would disagree] its more storing and distributing it. Plus the places which are most suited for this kind of development arent exactly the most welcoming to large expensive projects like this.
In my opinion solar is a waste of time, money and resources unless it is based outside the atmosphere. Only there would it collect enough energy to be particularly useful in a large-scale sense. Unfortunately getting things to space, for now, is too expensive.
The main problem with solar energy isn't it's cost any longer, large plants can be made to be as cheap as if not cheaper than a traditional nuclear power station. Arguably it isn't as dangerous a target should it succumb to a terrorist attack, blowing up a bunch of silicon and glass doesn't do much damage and panels can be manufactured rather quickly these days, now you blow up a nuclear reactor and you will have another Chernobyl on your hands.
The main drawback to it is in areas with massive solar potential it is rather far away from where energy is required, much of the energy will be lost in transmission. Ultimately until technology can find a way to reduce this photovoltaic energy must be viewed as supplemental rather than a complete solution to our energy needs. While it is indeed possible to live completely off grid relying on alternative sources of "green" energy even if you live in a country like Norway, it won't be a viable if everyone starts doing it as every house will then need a battery array the size of 3 king sized bed stacked up against each other just to provide sufficient power for a standard 3 bedroom home that is very well insulated. It won't be a practical solution unless you live in an area where you are off grid and have plenty of space such as a far away cottage on a homestead or something of that sort. Even then you will need to do your best to conserve energy as those batteries may not be fully charged up everytime and if you have a cold winter it will be a problem to get enough energy to heat up the home to a comfortable level unless you have bio-gas from your sewer systems.