New Delhi, Dec. 21 -- Entire San Francisco neighbourhoods witnessed a widespread blackout on Saturday following a massive power outage.

According to the San Francisco Chronicle, the outage affected over 1,30,000 homes and businesses by mid-afternoon. This accounts for approximately one-third of Pacific Gas and Electric Co.'s customers in the city.

The massive San Francisco power outages, triggered by a fire inside a PG&E power substation, began in the morning on the West Side of the city.

At around 3 pm, PG&E's website said that about 30% of all city customers were without power.

By Saturday afternoon, traffic stalled on a dark San Francisco street as street lights went out or went into the emergency blinking mode.

The San Francisco ...