High-current cables can need cooling, but it might be possible to use the magnetic field itself to pull heat away. Luca de’ Medici of the European Synchrotron Radiation Facility in Grenoble, France, has pointed out that the Ettingshausen effect could enable this. The idea is to coat the cables with a strong thermomagnetic material like bismuth carrying a small current to pull heat in a direction perpendicular to both the small current and the magnetic field. The effect, while relatively unfamiliar, is analogous to the thermoelectric effect, and can be strong enough to obtain about 60 K cooling for single layers and more than 100 K for double layers. Better thermomagnetic materials could even provide self-cooled superconducting cables that would work at room temperature.