Lightning Collectors are simple to construct, first you need a Lightning Rod, in large cities, you will find plenty of them on top of the tallest buildings, all you have to do is electrically isolate them from Ground, you can do this by making a special conductor that was designed to transmit Lightning long distances, you will want to have it go to ground at the very end of the conductor, and have a contact switch that will disconnect the ground when energy runs through it, thus forcing all the energy to drain through all the Lightning collectors attached to, then connect all your Lightning Collector Devices in parallel, these devices can be anything that can absorb the Energy from the Lightning without being fried in the process, so they need to be able to handle the amount of energy you allow to pass through them, so I would suggest very high-powered electric capacitors, you can attach them to the conduit and put a limiting circuit between it and the ground, and it needs to have a contact switch to disconnect the ground when the capacitor is full, so that you can limit how much energy can flow through it, then you can use that power, and charge up batteries, such a simple idea, yet no cities are doing this, and the reason is because of their Ignorance of Lightning.