In September 2005, the California Independent System Operator (CAISO) identified the Trans Bay Cable (TBC) project as the preferred option over alternatives from PG&E, which had proposed building AC lines to Potrero from East Bay substations in Moraga or Fremont. The SFSSG also studied projects to enhance long-term reliability, which included an evaluation of several proposals for transmission lines across San Francisco Bay. After the Jefferson-Martin project was complete, PG&E decommissioned Hunters Point in 2006. Reliability initiatives įollowing the prolonged outage, the utility ( Pacific Gas and Electric), the City and County of San Francisco, and the California Public Utilities Commission formed the San Francisco Stakeholder Study Group (SFSSG) to determine immediate transmission solutions to ensure electric reliability, which led to the upgrading of PG&E transmission lines and towers paralleling Interstate 280 under the Jefferson-Martin transmission line project to diversify the path.
#POWER CONVERTER TBC OFFLINE#
On December 8, 1998, a disturbance at that substation tripped it offline the resulting chain reaction also would knock the transmission lines out of service and shut down both Hunters Point and Potrero electric generating stations, causing a power outage covering most of the city for eight hours. Located at the northern tip of San Francisco Peninsula, the city was connected to the rest of California's grid through a single transmission path, including the San Mateo Substation near Coyote Point Recreation Area. Until recently, San Francisco had two power plants within city limits to support local demand: Hunters Point Power Plant (shut down in 2006) and Potrero Generating Station (shut down in 2011) the remaining electric load for the city is supplied through the grid. The Trans Bay Cable project was the first HVDC system to use the Modular Multi-Level Converter (MMC) system. The system was completed in November 2010. The line connects PG&E's Potrero Substation (formerly the switchyard for Potrero Generating Station) to its 230 kV transmission line in Pittsburg.
The 53 mi (85 km) cable under San Francisco Bay and through the Carquinez Strait can transmit 400 megawatts of power at a DC voltage of ☒00 kV, enough to provide 40% of San Francisco's peak power needs. The Trans Bay Cable is a high-voltage direct current (HVDC) underwater transmission cable interconnection between San Francisco, California and Pittsburg, California. High-voltage direct current (HVDC) submarine Trans Bay Cable LLC (a subsidiary of NextEra Energy Transmission) San Francisco Bay, San Pablo Bay, Suisun Bay
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