- Lower aesthetic and environmental impact than overhead lines
- Greater capacity than overhead lines or cables
- Higher maximum voltage than superconducting lines (compatible with other HVDC technologies)
- Less vulnerable to loss of insulation via leaking SF6 gas
- No direct potential to release SF6 (the most potent known greenhouse gas)
- Installation on rollers in a pipe between maintenance vaults allows more rapid repair than buried cable
- More compact than HVDC gas insulated lines
Electric Pipeline Corporation has invented and is developing polymer insulated electric pipelines "elpipes" for transmission of 3-30 GW through a pair of underground HVDC lines. Elpipes fit inside a pipeline that is similar to a gas pipeline, or they may be installed at the surface on conventional or narrow gauge railroad tracks. The train like features of elpipes make them convenient to install and convenient to repair.