As most of you have already pointed out, this is definitely a great initiative by Saudi Arabia towards their renewable energy program. Come to think of it, it makes complete sense for the largest exporter of crude oil in the world to reduce its economic dependency on fossil fuels. What is fascinating is that they are acknowledging that eventually, the kingdom's oil monopoly is going to die down and are willing to invest extensively(30-50 billion dollars by 2030 according to a fortune magazine article) in the near future. I commend the country's ministry of energy resources and its leadership for that. Their efforts towards creating an energy mix of wind and solar energy to harness clean energy alternatives could also stem from the fact that the country has suffered major budget deficits due to oil price drops in recent years. Aiming for 10% of the country's power supply from renewable energy sources by 2023 seems difficult but not completely unattainable. Also, it is important to note that Saudi Arabia has incredibly hot summers, their crude oil consumption going up to about 900,000 barrels a day and that is another reason why they are right in looking at cleaner, more economical energy resources for domestic as well as commercial purposes.
Here are a few related articles on the Kingdom's renewable energy program