The Trans Bay Cable project in San Francisco, California, which is owned and operated by SteelRiver Transmission Company, has been completed. Pattern Energy’s transmission team conceived, developed and managed for SteelRiver the construction of the Trans Bay Cable, a 53-mile, 400 MW High Voltage Direct Current submarine transmission line that can transmit up to 40% of the peak power needs for the city of San Francisco.

"The Trans Bay Cable provides a new source of power for the City of San Francisco, helping to lower long-term energy costs, relieve congestion and provide transmission reliability for the entire Bay Area, while shutting down the last remaining old power plant in San Francisco,” said Mike Garland, CEO of Pattern Energy. “Laying a transmission cable of this kind under the San Francisco Bay was a complex process and I am proud of the environmentally conscious method of development that the Pattern team employed. The Trans Bay Cable project will be a significant asset to San Francisco and the entire Bay area for many years to come and we are honored to have played a role in bringing it to fruition. In addition, we look forward to continuing our relationship with the City of Pittsburg, which has been our partner in this and other major California transmission development projects.”

In September 2005, the Board of Governors of the California ISO chose the Trans Bay Cable project over several other alternatives as the most feasible and fundamentally-sound energy transmission project to address the load capacity issues of San Francisco and northern San Mateo County, while also creating access for these areas to the abundant renewable energy sources of Northern California.