Long-term loss of the PV20 underground causeway cable, with many other outages, can cause severe and widespread voltage and thermal concerns. The transmission solution examined in the analysis conducted thus far is to install a second parallel PV20 causeway underground cable. This is a bulk system issue that is the responsibility of VELCO. The planning study has not yet begun. VELCO will revisit the issue in the 2009 study cycle.
The map at the left shows roughly the area of Vermont potentially affected by this reliability deficiency.