Electric Transmission

Due Diligence & Technical Services

E3 has extensive transmission experience encompassing the entire project life cycle of new and existing transmission lines including the planning, pre-financing, financing, construction, performance testing, and operations and maintenance phases. E3 personnel also have 25 years average of experience in generation and transmission planning for utilities, control area design, system operations experience, and consulting for international clients and cogeneration assignments. We have completed more than 30 transmission consulting assignments that have included more than 2,000 miles of new build transmission projects ranging from less than one mile to more than 350 miles. Our collective experience includes elevated, buried, submerged lines, voltage ratings below and above 500kV, and AC/DC transmission and conversion.

Technology Lead, Vince Tummarello

Representative Projects


Antelope-Elk Energy, Texas

E3 served as the Independent Engineer for the Sharyland Utilities 345 kV transmission line that connects the Antelope-Elk Energy Center in Hale County, Texas, to the White River substation in Floyd County, Texas. The line is owned by Golden Spread Electric Cooperative, and is approximately 51-mile long, running through the Panhandle of Texas. The Project is 100% regulated by the PUCT and receives revenues via a regulated rate base regime. The debt financing consisted of a construction and term-loan facility, with closing at the end of Q1 2015. Construction was completed in April, a month earlier than scheduled.

Water Plow

Trans Bay Cable Project, California

E3 provided Independent Engineering services for submarine transmission system. Trans Bay Cable is a 400 MW HVDC transmission system using underground and marine power cables to bring power to the City of San Francisco. The cable connects the Pacific Gas & Electric (PG&E) Pittsburg Substation, which had excess electrical capacity, to a load pocket at PG&E’s Potrero Station in San Francisco. E3 provided a technical due diligence review in support of financing the development and construction of the Project on behalf of Bayerische Landesbank. After construction was completed, E3 provided a report to Barclays Capital to support the long-term financing of the Project. E3’s report addressed the engineering, commercial, and environmental aspects of the 54-mile HVDC cable project. The Project utilized Siemens inverter technology and Prysmian XPLE cables. E3 also monitored the performance of construction and testing of the cable, on behalf of the lenders.


Transmisora Electrica del Norte (TEN) Project, Chile

E3 served as the Independent Engineer for the Transmisora Electrica del Norte (TEN), a 600-km-long 500 kV transmission line that connected Chile’s two main transmission systems, Sistema Interconectado Central (SIC) and Sistema Interconectado del Norte Grande (SING).  The transmission project will be responsible for the supply of energy to more than 97% of the national population, with an installed capacity of approximately 24,000 MW and a demand of 11,000 MW. The E3 team worked with lead banker, IPEX-Bank, along with nine local and international banks, and a U.S. insurance company, on the financing which provided the total debt capital for the equivalent of U.S. $854 million.  E3 also provided the construction monitoring for the Project.