Electricity is the attraction and repulsion forces between charged particles/matters. F=Ke x q1q2/R^2. It powers everything, and alternating current in the air is light/EM waves. You don't need electron flow to transfer energy/electricity, accelerate charges in atoms also transfers energy. That's why light can propagate in mediums.

How to accelerate charged particles? By changing the density of electrons in an antenna, by the means of inputing a changing current, there is no current flows through the terminal/antenna, but there will be changing electron density in the antenna, this creates changing electrostatic force in the antenna, the changing force energize air molecules around antenna, propagating as so-called EM waves, in fact, is alternating current in the air. Light waves are longitudinal waves, like sound wave and all pressure waves. Photoelectric effect is caused by AC in the air. If current flows back and forth is the mechanism of producing EM waves, where are EM waves produced from power lines? So much power/current in the power lines, would the EM waves distructible? 

Also curved space is never empty because electric charge is an innate part of matter, there is always electromagnetic fields.- Tesla
Space is pure empty. electrostatic force is co-existing with matter, immortal acting with matter constantly, there is no fields but force existing, at any distance simultaneously act on matters.

 Gravity is co-existing with all matters, constantly acting on all matters at any distance. There is no gravity wave propagate in space at light speed. Gravity is always there, is local, permanent resident. Don't need a green card.

Tesla is correct about all motions are caused by force, but he missed magnetic force and gravity are by products of electrostatic force, all forces, all energy are sourced from basic particles carried electrostatic force/charge. The universe is powered by electrostatic force/energy, therefore is immortal, conserved. Magnetic force is circular electrostatic force, gravity is net electrostatic force between all charges in distant matters.

All chemical reactions are caused by electrostatic force, all living functions are caused by electrostatic force, by the way of alternating electrostatic force.

I take no credit for all my ideas and finds. Newton's laws and Coulomb's law and nature taught me all.