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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.rank Alonso, P.E., is a manager of transmission engineering with SAIC. He has a bachelor's degree in electrical engineering from the University of Florida and has more than 40 years of experience in the electric utility industry. Reach him at frank.alonso@saic.com.