Instead of jamming electrons through wire, generators convert them to microwave signals and fling these along the surface of the earth, between a system of relays spaced about 20 or 30 miles apart.
Essentially a network of tiny wires, it features a larger surface area than flat electrodes, giving it the leverage it needs to convert more electricity in a smaller form factor.
After all, it seems pretty logical that they should be enhanced by global warming, as the thermal source that they convert to destructive kinetic energy is the heat of the ocean, which should go up with the surface temperature.