HVDC Technology

HVDC underground technology is safe, reliable and proven.

  • HVDC cables have negligible impact on their environmental surroundings. Unlike traditional oil-impregnated HVDC cables, modern “rubber-based” extruded cross-linked polyethylene (XLPE) cables are smaller, sleeker and more environmentally friendly.
  • HVDC underground technology also lowers energy losses and allows better grid control solving the problem of how to integrate intermittent (variable) renewable resources into the AC grid.
  • Underground transmission lines are less susceptible to damage by inclement weather or natural disasters. If a cable is damaged, automatic protection systems immediately stop the power flow within a fraction of a second.
  • HVDC systems like SOO Green provide protection against cascading failures leading to mass blackouts and, in the case of a blackout, provide remote “black start” capabilities to quickly restore electricity service.
  • Burying transmission cables in a secure, policed operating rail corridor provides grid security benefits.