At HMV Engineers we have designed more than 1200 km of medium and high voltage transmission lines, aerial and underground, so that the energy reaches all the places our customers require. The activities developed by HMV Engineers in the design of transmission lines include the following scopes: •Route selection.•Layout and template (PLS CADD).•Electromechanical design.• Insulation coordination.•Electromagnetic induction studies.•Metallic structures designs (TOWER) and poles (POLE).•Studies and field work (topographic survey, edaphological and geological studies, electrical resistivity, stakeout, access determination).•Environmental diagnosis of alternatives (DAA) and Environmental Impact Assessment (EIA).•Specifications for supply and assembly.•Design of foundations and protection works.•Design of subway lines (CYMCAP).