Verified answer

I will be honest with you, we don't exactly know what makes a proton positive and an electron negative. Heck we don't even really know what an electron is. The way it's looking is that an electron is a wave. People will tell you that an electron can be both, a particle and a wave. That may be the official story right now but I think it's a wave all the way and it may interact in ways that makes it seem like a particle.

I don't really think that electricity is energy. It's a medium, you can push on one side and it will push out on the other, so the energy is really you pushing on it. You could say that it can store energy too but someone had to put it there (like charging a capacitor). Think of another example, you compress a spring and lock it in place. Now there is energy stored on it and just sitting there. I think that's how you can think of electricity as well.

Some similar question that used to boggle my mind is that when I send current through a coil, it creates a magnetic field (electromagnet), until I take the current off. I used to think that then where does a permanent magnet get it's energy from. The answer is that the electromagnet only shows a lot of resistance when you turn it on and once it's on it doesn't consume any more power (aside from the resistance of the wire).