Introducti**
This overview c**tains informati** about electric transmissi** lines which are installed
underground, rather than overhead ** poles or towers. Underground cables have different technical
requirements than overhead lines and have different envir**mental impacts. Due to their different
physical, envir**mental, and c**structi** needs, underground transmissi** generally costs ****
and may be **** complicated to c**struct than overhead lines. Issues discussed in this pamphlet
include:
 Types of Underground Electric Transmissi** Cables
 Ancillary Facilities
 C**structi** and Operati** C**siderati**s
 Costs
 Repairs