The difference in color is due to the composition of the panels. Blue panels are made with monocrystalline silicon cells, while black panels use polycrystalline cells.
[pdf] Energy in the United Arab Emirates describes and production, consumption and import in the (UAE). The UAE has 7% of global proved oil reserves, about 100 billion barrels. Primary energy usage in 2009 in the UAE was 693 TWh and 151 TWh per million persons. The UAE is currently transitioning from an electricity generation system nearly 100% powered b.
[pdf] If you see dark spots on your panels, this could be a sign that your panels are undergoing delamination, and you should contact your installer for an inspection.
[pdf] 
