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Dominion Virginia Power is beginning an estimated $2 billion program to place about 4,000 miles of historically outage-prone electric power lines underground by 2026.
A new 138 kV overhead line costs approximately $390,000 per mile as opposed to $2 million per mile for underground (without the terminals).. These costs show a potential initial construction cost differential of more than five times for underground lines as opposed to overhead lines for construction in Wisconsin.Costs vary in other regions, but the relative difference between overhead and underground installation costs is similar from state to state.ccording to the May 2011 paper Underground Electric Transmission Lines published by the Public Service Commission of Wisconsin, The estimated cost for constructing underground transmission lines ranges from 4 to 14 times more expensive than overhead lines of the same voltage and same distance.