Grid Resilience and Hardening

storms · wildfire · cold · restoration

Weather now causes most major US outages, and utility lines have started fires that killed towns. Hardening is targeted, because burying everything costs too much.

Threats mapped to hardening measures: hurricanes and wind to stronger poles and undergrounding (Florida storm protection plans, CenterPoint); wildfire to covered conductor and fast-trip relays plus public safety power shutoffs (PG&E, SCE, Xcel, Victoria's REFCL mandate); ice and extreme cold to winterization and black start (ERCOT after Winter Storm Uri); flood and storm surge to elevated or walled substations; physical attack to barriers and spare transformers (NERC CIP-014 after the Metcalf attack); and any long outage to microgrids, batteries and automated fault isolation (FLISR) for hospitals, bases and data centers. THREAT TO HARDENING MEASURE Hurricane, wind Stronger poles, undergrounding Florida storm protection plans, CenterPoint Wildfire Covered conductor, fast-trip relays Shutoffs (PSPS); PG&E, SCE, Xcel, Victoria REFCL Ice, extreme cold Winterization, black start ERCOT after Winter Storm Uri Flood, storm surge Elevated or walled substations Gulf and Atlantic coast utilities Physical attack Barriers, spare transformers NERC CIP-014 after Metcalf Any long outage Microgrids, batteries, FLISR Hospitals, bases, data centers
Uri outages, Texas
4.5M+ customers
Beryl, Houston
~2.26M customers
Undergrounding
$2-10M per mile
Hub
Energy

Finding

Fault automation is the cheapest resilience gain and undergrounding the most expensive, so utilities spend by corridor risk rather than across the system

Winter Storm Uri left more than 4.5 million Texas homes and businesses without power in February 2021; Hurricane Beryl cut power to about 2.26 million CenterPoint customers in Houston in July 2024. Utility equipment has been linked to the Camp Fire (2018, PG&E), the Lahaina fire (2023, Hawaiian Electric) and the Smokehouse Creek fire (2024, Xcel), the largest in Texas history.

The response splits by hazard. Florida's 2019 storm protection plan law drives pole replacement and undergrounding; California utilities file wildfire mitigation plans built on covered conductor, fast-trip settings and public safety power shutoffs, and Victoria in Australia mandated rapid earth fault current limiters (REFCL) after Black Saturday. ERCOT added winterization rules after Uri. China's State Grid and China Southern Grid rebuilt ice-loading standards after the 2008 southern ice storm.

Restoration is the other half. Automated fault location, isolation and service restoration (FLISR) shrinks outages from hours to minutes for a fraction of the cost of burying lines, and microgrids with batteries keep critical sites running when the feeder is down.

Measures

Hardening measures

Ranked from broadest adoption to most selective.

Grid hardening measures
MeasureTechnologyFunctionWhere it leadsOutlook
Sectionalizing and automation (FLISR)Automated reclosers, switches, ADMSIsolates faults and reroutes powerMost large US utilitiesWidespread; low cost, high SAIDI/SAIFI gain
Wildfire mitigationCovered conductor, fast-trip relays, REFCL, PSPS, camerasCuts ignition riskCalifornia, Texas Panhandle, Mountain West, Australia, MediterraneanRapid growth; mandatory in California and Victoria
Storm hardeningSteel and concrete poles, guying, flood wallsSurvives hurricane wind and surgeFlorida, Gulf Coast, CarolinasRate-approved programs in the Southeast
Black start and microgridsOnsite generation, BESS, microgrid controllersRestores or holds load without the gridHospitals, defense, data centersSteady growth for critical loads
UndergroundingBuried cable, duct banksRemoves wind, ice and fire exposureUrban cores, high-fire corridors (PG&E)Targeted, not universal, due to cost

Events

Outages and fires that set the agenda

Major grid events and what changed
EventYearImpactWhat changed
Camp Fire, California201885 deaths; PG&E transmission lineWildfire mitigation plans, PSPS, undergrounding pledge
Winter Storm Uri, Texas20214.5M+ homes and businesses without powerERCOT winterization rules, market reforms
Moore County substations, North Carolina2022Gunfire disabled two substations; about 45,000 customers out for daysPhysical security reviews, spare transformer programs
Lahaina fire, Maui2023102 deaths; Hawaiian Electric linesUtility shutoff programs in Hawaii
Smokehouse Creek fire, Texas2024Largest wildfire in Texas history; Xcel equipment involvedTexas utility wildfire plans
Hurricane Beryl, Houston2024About 2.26M CenterPoint customers outCenterPoint resiliency plan: poles, undergrounding, automation

Bottlenecks

What slows hardening

Grid hardening bottlenecks
BottleneckConstraintImpact
Undergrounding cost$2-10 million per mile in urban areasLimits it to the highest-risk corridors
Equipment lead timesTransformers, conductors, switchgearDelays rebuilds and spares
WorkforceLineworkers and trenching crewsCaps annual miles hardened
Cost recoveryMulti-billion-dollar plans need rate approvalAffordability pushback from regulators
IntegrationFLISR, OMS and ADMS not always interoperableSlows automated restoration

Sources

Sources and scope

Scope
Grid Resilience and Hardening
Sources
ERCOT and PUCT reports on Winter Storm Uri; CenterPoint; CAL FIRE; Maui Police Department; Florida PSC; NERC
Updated
October 2026