
2009: 30th Street 20a Transmission Undergrounding
The 30th Street 20a Transmission Undergrounding project provided a safer, more reliable energy source for the people of San Diego. The largest span of utility undergrounding in the history of San Diego, the project entailed converting a 20,304 foot-long 138kV electric transmission line from overhead to underground. The project also represents the highest voltage transmission … Continue reading 2009: 30th Street 20a Transmission Undergrounding