An average bolt of negative lightning carries a current of 40 kA (kiloampreas) although some bolts can be up to 120 kA, and transfers a charge of 5 coulumbs and 500 MJ (megajoules)or enough energy to...
A typical lightning bolt contains 1 billion volts and contains between 10,000 to 200,000 amperes of current. The average flash would light a 100 watt lightbulb for 3 months.
In lightning we hardly know the voltage level and current flown in advance. It is also not possible to predict the same. Also if we are to generate electricity from lightning, the level of insulation...