A.1   introduction

This Appendix to the Draft Environmental Impact Report (EIR) describes the Trans Bay Cable (TBC) Project (Project) proposed by Trans Bay Cable LLC, including alternatives. The Project is a High Voltage Direct Current (HVDC) submarine transmission system planned to transmit 400 megawatts (MW) of electrical power and provide a dedicated connection between a substation in the East Bay in Pittsburg, which is fed by sufficient generating and transmission capacity, and the electrical transmission and distribution facilities in San Francisco. The Project is designed to be a cost-effective, energy-efficient solution addressing San Francisco's need for additional energy, while reducing transmission grid congestion and improving transmission grid reliability and load serving capability.

The proposed Project consists of the following major components:

The Project is scheduled to take approximately 27 to 30 months to perform final engineering, manufacturing, construction, start up, and testing to be ready for commercial operation. The construction phase is scheduled to take approximately 20 months, including approximately 4 to 5 months to install the cable systems in the floor of San Francisco Bay and onshore, followed by 5 to 6 months of startup and commissioning activities. The construction phase would be preceded by approximately 3 to 6 months of demolition of existing structures, site preparation, and remediation (as applicable).

Figure A.1-1 shows the overall project and the HVDC and High Voltage Alternating Current (HVAC) submarine cable routes. Figures A.1-2 and A.1-3 show aerial views of the proposed converter station sites and the routing of the AC and DC inter-tie connections in San Francisco and Pittsburg, respectively.

The balance of this Appendix to the EIR is organized as follows:

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