Abstract: A capacitor structure for dissipating heat, for example, generated by high ripple currents. The capacitor includes an outer casing of substantially annular cross section comprising an outer side wall, a bottom and an interior tube integrally formed from a substantially continuous piece of thermally conductive material. A capacitor winding of substantially annular cross section is disposed within the outer casing which is sealed at a top. The capacitor winding may be in close thermal contact with the inner tube, the bottom and the outer side wall to improve heat dissipation.