Hygroelectricity is basically harnessing the energy from electrically charged droplets in the atmosphere. Scientists are in the early stages of developing devices to harness it. It seems that moisture in the air is not electrically neutral as previously thought. Water in the atmosphere can actually accumulate electrical charge and transfer that charge to other things it comes in contact with.
If this becomes a viable option just think about the possibilities of this – energy for nothing! Of course like any great idea relating to energy to be viable it has to use less electricity in extracting it than is produced in the process. An interesting technology to watch.