History Although the City has been undergrounding lines since 1970, approximately 1,000 miles of overhead utility lines remain to be undergrounded. It is estimated that nearly all residential areas will be completed within the next 54 years.SDG&E Franchise FeesSDG&E Franchise Undergrounding ObligationsRevised Changes to Franchises Approved by City CouncilExpanded Undergrounding ProgramOrdinance and Policy ChangesCox Communications and Time Warner Cable