I wonder how Patriot systems deliveries to Ukraine will affect our energy grid integrity

I am aware that Patriots have an insane range and can shoot down basically anything from drones to fighter jets way before they reach their targets, which is great. However, obviously we are getting only limited amount of them, knowing how expensive and hard to make they are. So, I assume they will be defending key power generation objects. What concerns me is the fact that Russia uses swarms of cheap Iranian "Shahed-136" drones, and since recently even smaller "Shahed-131" variants, so I wonder if our AA will be overwhelmed, and if we can reliably and quickly identify approaching targets, in order to not waste expensive Patriot missiles on stupid scooter drones and decoys (Shaheds make a sound similar to a scooter engine when they fly if you didn't know). I'm far from expert on this topic, but I would like to understand it more. These idiots even launched missiles with dummy nuclear warheads at us, can you believe it... But then again they sent packages with literal animal eyes in them to tens of our diplomats in many countries across Europe, so I guess it's not that surprising.