HOW THE TECHNOLOGY WORKS:
The Metro System scientists used ionisers to produce negatively charged particles called electrons.
They have a natural tendency to attach to tiny specks of dust which are ever-present in the atmosphere in the desert-regions.
These are then carried up from the emitters by convection - upward currents of air generated by the heat release from sunlight as it hits the ground.
Once the dust particles reach the right height for cloud formation, the charges will attract water molecules floating in the air which then start to condense around them.
If there is sufficient moisture in the air, it induces billions of droplets to form which finally means cloud and rain.
The spice must flow...
HOW THE TECHNOLOGY WORKS:
The Metro System scientists used ionisers to produce negatively charged particles called electrons.
Glad you reminded yourself to put that explanation in. Too bad you don’t have any pix.
That's the key. Without precipitable water, nothing will work.