On December 20, 2025, a significant power outage struck San Francisco after a fire damaged a Pacific Gas & Electric (PG&E) substation, leading to a halt of Waymo’s extensive robotaxi fleet at darkened intersections. This outage caused widespread congestion and revealed critical challenges in handling emergencies within the autonomous vehicle sector, prompting urgent calls for regulatory reforms.

Outage Disrupts Waymo’s Robotaxi Operations and City Traffic

Videos spreading on social media depicted Waymo’s driverless taxis stopped with hazard lights activated amid a blackout affecting roughly one-third of San Francisco. The company, which operates over 2,500 vehicles in multiple cities including San Francisco, Los Angeles, Phoenix, Austin, and Atlanta, paused services and resumed only the following day. Although its vehicles are programmed to treat lost traffic signals as four-way stops, the blackout sparked a concentrated surge in remote confirmation requests. According to Waymo, more than 7,000 such dark signal encounters occurred on December 20, but the high volume of requests overwhelmed remote “fleet response” teams and worsened street congestion.

Waymo relies on teleoperation—human assistance remotely managing vehicles during complicated situations—but this system shows clear limitations in large-scale events, as seen in this outage. Experts including Missy Cummings, director of the George Mason University Autonomy and Robotics Center, emphasized the need for federal regulation to mandate backup procedures for remote control during catastrophic failures, underscoring gaps exposed by the outage.

Regulatory Bodies Investigate Amid Industry-Wide Safety Concerns

The California Department of Motor Vehicles (DMV) and California Public Utilities Commission are actively examining the outage’s impact on robotaxi safety and emergency response. The DMV is engaging with Waymo and other developers to formulate stricter protocols and is creating regulations to ensure remote operators meet rigorous standards for safety and accountability. This review reflects broader concerns after past incidents, such as the 2023 fatal pedestrian accident involving General Motors’ Cruise, which led to a revocation of its robotaxi permit and a temporary suspension of its operations.

The outage revived debates about the commercial readiness of robotaxi fleets amid rapid industry expansions. Tesla recently launched its robotaxi service in Austin, Texas, pledging swift growth. Meanwhile, Waymo continues incremental expansion with over 2,500 vehicles operating across five metropolitan areas. Autonomous tech experts like Carnegie Mellon University’s Philip Koopman warn that large-scale fleets must pass tougher permitting requirements to demonstrate resilience against blackouts or natural disasters. Koopman called the San Francisco outage “a shot across the bow” signaling urgent improvement needs.

Waymo Updates and Sector Challenges Highlighted Post-Outage

Following the outage, Waymo announced ongoing refinements to its confirmation process, originally developed in early deployment phases, to better support its growing fleet complexity and scale. The company is deploying software updates enabling vehicles to recognize specific power outage conditions, thereby enhancing decision-making during similar crises ahead.

The San Francisco outage starkly exposed operational vulnerabilities in the autonomous vehicle industry’s emergency readiness and teleoperation limits. For investors, regulators, and stakeholders, ensuring dependable robotaxi performance under extreme scenarios remains a critical hurdle as fleets expand and demand grows.