Capturing energy from lightning

I've been thinking about this too.
Just google it and you'll find a lot of people made this analysis: while the energy is powerful, the fact that a lightning just strikes for 0,025sec makes the total amount of energy very limited (I've seen numbers around 140Kw/h). 2 difficult problems remain: how to know where the lightning will strike, and how to harvest it.
As an example: Harvesting lightning energy - Wikipedia, the free encyclopedia.
Anyway where do this statement come from (power NYC for a year)? Is it achieved by harvesting all the US territory lightning for 1 year too?

Already been done. 1.21 gigawatts!

Let's see if it really worked on 21/10/2015! (for the atheists, the date they time travelled in the future). :scared:

Remember that energy does not equal power;

A lightning bolt contains ~250kWh of energy. If we harnessed all the lightning in the world that would power 8%... of the US only...