Trans Bay Cable

Trans Bay Cable

Trans Bay Cable operates a 53-mile high-voltage direct current (HVDC) submarine transmission system running beneath San Francisco Bay, linking Pittsburg, California, to San Francisco. The cable delivers up to 400 megawatts of electricity, meeting approximately 40% of San Francisco's peak power needs and enhancing the region's energy reliability.

The company specializes in HVDC technology, utilizing a submarine cable and advanced converter stations at both ends to efficiently transmit high-capacity power beneath the bay, and was the first in the world to implement the Modular Multi-Level Converter (MMC) system in an HVDC setting.