A conductive composition can include a polyolefin base polymer, a high structure carbon black and a low structure carbon black. The conductive composition can exhibit two or more of a thermal conductivity of about 0.27 W/mK or more when measured at about 75° C., a volume resistivity of about 75 ohm-m or less when measured at about 90° C. and an elongation at break of about 300% or more. Cables having coverings formed of such conductive compositions and methods of making such cables are also described herein.