What is TBC?

Trans Bay Cable (TBC) is an energy transmission infrastructure project chosen by the California Independent System Operator (CAISO) to provide reliable energy to the City of San Francisco.

TBC consists of an approximately 53-mile long transmission line that will run under the San Francisco Bay to transfer already existing energy, from an electric transmission system substation in Pittsburg to San Francisco. TBC does not involve any new energy generation.

The CAISO has deemed that the northern San Francisco Peninsula needs additional transmission to ensure energy reliability in 2010 and beyond. In September 2005, after a lengthy stakeholder process, the CAISO selected TBC over its alternatives as the best transmission solution for the northern San Francisco Peninsula.