Stadium lighting, or a small section of white road lights.
as red said, i dont think anything on the ground could generate that intensity of light over such a wide distance... its very well defined too - youd need a tightly arranged array of powerful lights to cause that - notice there isnt too much cloud to reflect any light from the ground, either...
It looks to me like sunlight - its 2:45am*, sunrise in a few hours, most likely that...
* i doubt a stadium would have lighting on of that power at that time in the morning, is there even a stadium of such size in that area?