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San Francisco went dark—and the same substation has burned before

San Francisco went dark—and the same substation has burned before

Built World

A Mission Street fire knocked out power for 130,000 accounts, snarled transit, and exposed fragile urban dependencies.

December 24th, 2025: Full power restoration completed for all SF customers

Overview

San Francisco is the kind of city that feels unstoppable—until the lights go out. On Saturday, a substation fire near 8th and Mission helped trigger a blackout that spread across neighborhoods and knocked out traffic signals. Restoration took more than two days and sparked political backlash and raised questions about whether a modern city can tolerate single-point failures in critical infrastructure.

This substation burned on the same calendar day in 2003—an echo raising a brutal question: was this an unpredictable accident, or a repeat of risks everyone already knew? PG&E completed maintenance in October and inspections in early December, but the cause remains under investigation. The company set aside $50 million in compensation and faced criticism from City Hall.

Key Indicators

130,000
Peak San Francisco accounts without power
About one-third of the city's PG&E customers went dark during the peak disruption.
100%
Full restoration by Tuesday morning
All customers restored by 4:31 a.m. Dec 24, ending a 2.5-day outage for thousands.
$50M
Compensation fund announced by PG&E
Set aside for automatic credits ($200 residential, $2,500 business) plus claims process.
$6.5M
Regulatory penalty tied to the 2003 substation fire
State regulators ordered improvement spending in lieu of a fine after the earlier incident.
22 years
Time between the 2003 and 2025 Mission substation fires
The 2025 fire landed on the same date as the 2003 event.

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People Involved

Organizations Involved

Pacific Gas and Electric Company (PG&E)
Pacific Gas and Electric Company (PG&E)
Investor-owned electric and gas utility
Completed full restoration Dec 24; announced $50M compensation; hired independent investigator; facing mayoral criticism and investigation scrutiny

PG&E runs the wires San Francisco can’t live without—and absorbs the blame when they fail.

San Francisco Department of Emergency Management (DEM)
San Francisco Department of Emergency Management (DEM)
City emergency management agency
Issued public safety guidance and coordinated response as core systems degraded

DEM is the city’s switchboard for crisis coordination when normal systems stop working.

San Francisco Fire Department (SFFD)
San Francisco Fire Department (SFFD)
Municipal fire department
Responded to substation fire and supported stabilization efforts

SFFD fought a dangerous infrastructure fire inside a critical node of the city’s power system.

California Public Utilities Commission (CPUC)
California Public Utilities Commission (CPUC)
State utility regulator
Historical enforcer tied to the same substation’s 2003 fire; potential oversight pressure point

CPUC is the referee that can turn utility failure into penalties, mandates, and forced investments.

Waymo
Waymo
Autonomous vehicle subsidiary of Alphabet
Service resumed Dec 21; acknowledged operational failures; rolled out software updates Dec 24 to handle regional power failures

Waymo’s robotaxis turned a power outage into a visible test of autonomy under degraded infrastructure.

Exponent
Exponent
Engineering and scientific consulting firm
Conducting independent investigation of Mission substation fire for PG&E

Exponent is the third-party investigator tasked with determining what failed and why.

Timeline

January 1996 December 2025

17 events Latest: December 24th, 2025 · 5 months ago Showing 8 of 17
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  1. Full power restoration completed for all SF customers

    Latest Update

    Final 3,800 customers reconnected, ending outage that lasted more than two days for some.

  2. Waymo announces software updates after acknowledged failures

    Operational

    Company admitted scale of outage overwhelmed coordination system; updated fleet to handle regional power failures more decisively.

  3. PG&E announces $50M compensation fund and automatic credits

    Corporate

    Utility pledged $200 residential/$2,500 business credits plus claims process for spoilage, wages, losses.

  4. Mayor Lurie calls prolonged outage 'unacceptable'

    Statement

    Lurie demanded answers from PG&E, citing City Hall's two-day blackout and 'extremely frustrated' residents.

  5. Most power restored, tens of thousands still out

    Update

    PG&E restored about 110,000 accounts; roughly 21,000 remained without service.

  6. No clear restoration ETA as repairs remain complex

    Update

    PG&E said it couldn’t provide a precise timeframe for full restoration.

  7. Waymo resumes service after overnight suspension

    Operational

    Waymo restarted ride-hailing after pulling robotaxis when traffic-signal outages overwhelmed fleet coordination.

  8. Outages begin and spread across neighborhoods

    Incident

    Reports showed power cuts starting mid-morning and expanding through the day.

  9. Fire breaks out at Mission substation

    Incident

    A fire at 8th and Mission damaged equipment and complicated restoration work.

  10. PG&E says about 130,000 accounts affected

    Statement

    PG&E reported a large outage and said it was coordinating with city responders.

  11. Waymo pauses robotaxi service as signals fail

    Operational

    Waymo suspended ride-hailing after vehicles appeared stalled at dark intersections.

  12. Fire fully extinguished at Mission substation

    Incident

    SFFD fully suppressed the blaze, allowing investigators to enter and begin cause determination.

  13. PG&E reshuffles leadership around “better service”

    Corporate

    PG&E announced an organizational overhaul effective January 1, 2026.

  14. Earlier December outage shows a city already on edge

    Incident

    Hunters Point equipment failure cut power to 22,500+ customers, then restored.

  15. Holiday-season blackout hits 120,000+ in a near-repeat

    Historical

    A Mission substation fire caused major outages and later drew CPUC sanctions.

  16. Earlier Mission substation fire becomes a warning that didn’t stick

    Historical

    Records later cited a similar fire at the same substation in 1996.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

2003-12-20

Mission Substation Fire and San Francisco Blackout

A fire at the same Mission-area substation knocked out power to more than 120,000 customers during peak holiday season. Subsequent reviews criticized lapses and led to regulatory consequences.

Then

Service was restored, but the incident triggered an official regulatory probe.

Now

The CPUC imposed consequences tied to substation improvements—now relevant again.

Why this matters now

It turns the 2025 outage from bad luck into a test of whether lessons were actually implemented.

2003-08-14 to 2003-08-15

Northeast Blackout

A cascading grid failure cut electricity to tens of millions across the U.S. and Canada. Major cities saw transit disruptions, traffic chaos, and economic shock in hours.

Then

Power returned over one to two days depending on location.

Now

Reliability standards, monitoring, and coordination practices intensified across the industry.

Why this matters now

It shows how fast urban life breaks when electricity fails—and why redundancy matters.

2019-07-13

Manhattan Blackout

A failure in Manhattan’s power system caused a large outage that halted transit, darkened streets, and disrupted nightlife. The event highlighted the vulnerability of dense cities to a few critical nodes.

Then

Most power restored within hours; investigations followed.

Now

Pressure increased for infrastructure upgrades and stronger contingency planning.

Why this matters now

San Francisco’s outage is the same genre: one node fails, a city’s rhythm collapses.

Sources

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