It's way easier and cheaper to build a given amount of capacity in a single massive installation...
This is, IMHO, why we should make it a priority to put PV on large commercial / industrial / institutional buildings. Double use of land, serious economies of scale, a maintenance organization already accustomed to dealing with rooftop infrastructure, and a ready customer for the produced energy (which means storage, transmission, and buy-back schemes may not be necessary at all) all together.
That's crazy that, even in sunny Las Vegas, that installation only supplies 20% of the total electricity that Mandalay Bay uses. It takes some serious power to run a hotel/casino/venue, apparently.
Or maybe it's just the number of floors. My parents' rooftop solar installation covers about 100% of their annual usage. But it's a two story house with a basement. Mandalay Bay is significantly taller on average.
This is, IMHO, why we should make it a priority to put PV on large commercial / industrial / institutional buildings. Double use of land, serious economies of scale, a maintenance organization already accustomed to dealing with rooftop infrastructure, and a ready customer for the produced energy (which means storage, transmission, and buy-back schemes may not be necessary at all) all together.
Like this: http://www.dlrgroup.com/work/mandalay-bay-solar-array/