1. 33. Edison Electric Institute, “ Out of Sight, Out of Mind?' A Study on the Costs and Benefts of Undergrounding Overhead Power Lines” (January 2004).
2. 32. North American Electric Reliability Council (NERC) Disturbance Analysis Working Group (DAWG) database.
3. 31. According to a U.S. Department of Energy Offce of Electricity Delivery and Energy Reliability GridWorks Overview of the Electric Grid dated August 2005.
4. 27. Newaz G. , Bigg D. , and Eiber R. of Battelle's Columbus Division presented a report to EPRI entitled “Structural Composite Cores for Overhead Transmission Conductors” in April, 1987 (EPRI Report EM-5110, Research Project 2426–9).