A semiconductive polyolefin composition comprising (i) up to 80 wt. % of a polyolefin (I), (ii) carbon black, and (iii) up to 60 wt. % of a polymer (II) having a melting point of not less than 100° C., wherein the polyolefin (I) comprises two different ethylene copolymers: a first ethylene copolymer and second ethylene copolymer; wherein the first ethylene copolymer comprises polar group containing co-monomers in the amount of 3.5 mol % or less; and wherein the second ethylene copolymer comprises silane group containing co-monomers in the amount of 0.7 mol % or less.