Waymo Resumes San Francisco Service After Power Outage Disruption

TL;DR

• **Service Restored:** Waymo resumed its one-hour paused robotaxi service in San Francisco on Saturday night after a power outage affecting roughly 7,000 PG&E customers disrupted traffic signals.
• **Cause of Disruption:** Autonomous vehicles were forced to stop at intersections with non-functioning signals, leading the company to pause operations temporarily to assess the outage's scale and coordinate with local officials.
• **Reliability Concerns:** The incident highlights recurring challenges for self-driving technology in urban environments, where infrastructure failures like power outages can immobilize fleets and cause traffic congestion.

Service Disrupted by Grid Failure

Waymo has officially resumed its autonomous ride-hailing service in San Francisco following a temporary one-hour pause triggered by a significant power outage. The Alphabet-owned company confirmed that operations returned to normal after making "temporary adjustments" to monitor local conditions while approximately 7,000 PG&E customers in the city lost electricity. A screenshot of the notification sent to customers indicated that service was "temporarily paused" and that "freeway routes are unavailable" during the disruption.

A Waymo spokesperson clarified the timeline, stating the company "decided to pause service for approx. one hour to assess the scale of the power outage affecting a large portion of San Francisco and coordinate with local officials." By 6 p.m. on Sunday, the company announced via its app that ride-hailing service in the San Francisco Bay Area had been fully restored.

Autonomous Vehicles Stuck at Dark Intersections

The root of the disruption stemmed from Waymo's autonomous vehicles reacting to non-functioning traffic signals. Videos captured during the event show Waymo cars immobilized at San Francisco intersections where traffic lights had gone dark due to the outage. While Waymo vehicles are programmed to treat non-functional signals as four-way stops, the company acknowledged that the "extensive nature of the outage resulted in situations where vehicles remained stationary longer than typical while confirming the status of the affected intersections."

This immobilization created traffic congestion and frustration for drivers of conventional vehicles, who found themselves stuck behind the stationary autonomous fleet. Tow truck operators reported retrieving several Waymo vehicles throughout the night, though city officials confirmed that no injuries or accidents occurred during the incident. At one point, the outage affected a large portion of the city, leaving at least 30% of San Francisco in the dark.

Recurring Challenges for Urban Self-Driving Tech

This incident underscores the recurring vulnerability of self-driving technology when faced with infrastructure failures in dense urban environments. The event is not isolated; similar issues have previously caused significant disruptions. In a previous power outage in December 2025, Waymo suspended service after vehicles halted at non-functioning signals, impacting around 130,000 PG&E customers and causing significant congestion.

The reliability of autonomous systems in urban settings depends heavily on consistent infrastructure. When critical components like traffic signals fail, the AI must rely on fallback protocols that can be less efficient than human decision-making in chaotic scenarios. The December 2025 outage, caused by a fire at a substation, resulted in a more prolonged suspension where the service remained inactive for much of Sunday afternoon.

Waymo Announces Fleet Updates to Prevent Future Stops

In response to the challenges posed by infrastructure failures, Waymo is implementing specific upgrades to improve navigation during future outages. Following the December 2025 blackout, the company announced "fleet-wide updates" to equip vehicles with "more context regarding regional outages," enabling them to make more informed decisions at intersections. The company stated its ongoing goal is to develop the "Waymo Driver to navigate the world as it exists, including during infrastructure failures."

The company is also enhancing its "emergency response protocols" and collaborating with San Francisco Mayor Daniel Lurie's office to improve emergency preparedness. Additionally, Waymo is revising its first responder training based on insights gained from large-scale events like the recent power outages. These measures aim to mitigate the risk of vehicles becoming immobilized and causing traffic backups when the city's power grid is compromised.

Weather and Infrastructure Remain Key Variables

The reliance on external infrastructure remains a critical variable for autonomous fleet reliability. Beyond power outages, Waymo has also paused services due to severe weather, such as flash flood warnings on Christmas Day, demonstrating that environmental conditions continue to dictate service availability. As the company expands its footprint, the ability to navigate these dynamic urban challenges—whether from grid failures or extreme weather—will be essential for maintaining public trust and operational consistency.

AndroGuider Team

Articles written by the AndroGuider team. We try to make them thorough and informational while being easy to read.