China has successfully deployed the world’s largest power-generating kite, capable of harnessing the potential of energy-dense, high-altitude winds to provide cheaper power than traditional surface turbines
The 5,000 square-metre high-altitude wind power capture kite was unfurled at a test site at Alxa Left Banner in the Inner Mongolia autonomous region on Wednesday, according to state broadcaster CCTV.



Yep.
5000 m2 is more or less “the size of a football field” (50 x 100 m).
5 km2 is 5000 x 1000 m = 5 000 000 m2, “the size of a large farm field”, not a practical size to get airborne with current technology.