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Power outages in the United States

The U.S. power system is a patchwork of three large interconnections, several regional operators and more than 3,000 utilities. That structure shapes how outages happen, who fixes them and how fast service comes back. This page explains how the grid is organized, what causes most outages, and what investments and innovations are reshaping reliability.

The U.S. utilities behind your local outage

Twenty-one U.S. utilities have a dedicated page on GeoBlackout, grouped below by region. Each one serves a distinct part of the grid, with its own outage map, restoration practices and exposure to weather.

Northeast: dense networks under storm and ice pressure

From New England to the Mid-Atlantic, six utilities operate some of the oldest and densest distribution networks in the country. Nor'easters, ice storms and heat waves drive most major events here.

• Con Edison, New York City and Westchester County
• National Grid, upstate New York, Massachusetts and Rhode Island
• Eversource, Connecticut, Massachusetts and New Hampshire
• PECO, Philadelphia and southeastern Pennsylvania
• PPL Electric, central and eastern Pennsylvania
• JCP&L, northern and central New Jersey

Southeast: hurricane country and the most-watched outage maps

Hurricane season makes the Southeast the part of the country where outage maps get the most traffic. Four utilities share most of the load from Florida to Louisiana.

• Duke Energy, North Carolina, South Carolina, Florida, Indiana and parts of Ohio and Kentucky
• Georgia Power, nearly the entire state of Georgia
• FPL, Florida (largest distribution network in the state)
• Entergy, Louisiana, Mississippi, Arkansas and east Texas

Midwest: tornado alley and aging Great Lakes infrastructure

Between severe thunderstorms, derechos and brutal winters, the Midwest sees outages from every direction. Five utilities anchor coverage from Michigan to Missouri.

• Ameren, Illinois and Missouri (including St. Louis)
• DTE Energy, Detroit and southeast Michigan
• Consumers Energy, most of the rest of Michigan
• Evergy, Kansas and Missouri
• We Energies, eastern Wisconsin and the Upper Peninsula of Michigan

South Central: Texas, the ERCOT island and the Mississippi corridor

Texas runs on its own interconnection, which makes outage dynamics here unlike anywhere else in the country. Three utilities cover the bulk of the population in this zone.

• Oncor, Dallas-Fort Worth and much of north and west Texas
• CenterPoint Energy, the Houston metro area
• MLGW, Memphis and Shelby County, Tennessee

West: wildfires, PSPS shutoffs and Pacific Northwest windstorms

Outages in the West are increasingly driven by wildfire-prevention shutoffs and summer-evening capacity stress. Two utilities anchor coverage on the Pacific coast.

• PG&E, northern and central California
• PSE (Puget Sound Energy), Seattle-Tacoma and western Washington State

Multi-state operators with a distinct profile

One operator sits outside a clean regional bucket because its footprint spans multiple zones with a generation-heavy profile rather than a single dominant service territory.

• AES (AES Indiana, AES Ohio), distribution in Indiana and Ohio plus a large national generation portfolio

• How the U.S. grid is structured and where outages usually start
• Who runs and regulates the system that keeps the lights on
• Reliability metrics that measure how often and how long the power goes out
• Investments and smart-grid technologies that are changing how outages are managed

How the grid is structured

The U.S. does not have a single national grid. Power flows through three large synchronous networks, plus a few smaller systems, and any disturbance has to be contained inside its interconnection. Inside each one, electricity moves through three stages:

• Generation: power plants (gas,
• nuclear, coal, hydro, wind, solar) produce electricity.
• Transmission: high-voltage lines carry bulk power across long distances.
• Distribution: lower-voltage local networks bring power to homes and businesses.

Most customer outages start on the distribution network, the part closest to the customer, where storms, fallen trees, equipment faults and small accidents do the most damage. Failures higher up, on transmission lines or generation plants, are rarer but can cascade across multiple states and affect millions of customers at once.

The three major interconnections

Each interconnection runs synchronously at 60 Hz. They are barely connected to each other, which is why a major event in one region rarely propagates to another, but also why power cannot easily be rerouted from a healthy interconnection to a stressed one during a crisis.

Eastern interconnection

Stretches from the Atlantic coast to the Rocky Mountains, plus part of northern Texas. It serves around 250 million people across roughly 39 states and the District of Columbia, with about 700 GW of installed generation. It is the largest of the three and the most exposed to hurricanes, ice storms and severe thunderstorms, which together drive the bulk of major outage events on the East Coast and in the Midwest.

Western interconnection

Covers 11 western states plus parts of Canada and Mexico, around 80 million people and roughly 250 GW of installed generation. CAISO is the only formal RTO in the region. The main outage drivers here are wildfires, wildfire-prevention shutoffs (PSPS), heat waves and summer-evening capacity shortfalls when solar generation drops off but demand stays high.

ERCOT

Covers most of Texas with about 27 million people and 140 GW of installed generation. It is intentionally isolated from the other two interconnections. That isolation became a major issue during the February 2021 winter storm, when ERCOT lost a large share of its generation in cold weather and could not import enough power from neighboring grids, leading to multi-day outages for millions of customers.

Who runs and regulates the grid

Reliability in the U.S. depends on a layered system of federal regulators, regional operators and local utilities. Each layer plays a specific role when a problem hits the network.

Federal layer

• FERC (Federal Energy Regulatory Commission) regulates interstate transmission and wholesale power markets, and approves the reliability standards that apply across the country.
• NERC (North American Electric Reliability Corporation) sets and enforces those mandatory reliability standards, and investigates major outage events.
• DOE (Department of Energy) funds research and modernization, and coordinates emergency response when a disaster knocks out parts of the grid.

Regional transmission organizations and ISOs

These independent operators manage regional grids, balance generation and demand minute by minute, and keep the system stable when a plant trips or a line fails. They are the first responders for transmission-level events.

• PJM, 13 Mid-Atlantic and Midwest states plus DC, around 65 million people and 165 GW peak demand.
• MISO, 15 states from the Great Lakes to the Gulf plus Manitoba, around 45 million people and 127 GW peak.
• CAISO, most of California plus parts of Nevada, around 30 million people and 50 GW peak.
• ERCOT, most of Texas, around 27 million people and 85 GW peak.
• ISO-NE, six New England states, around 15 million people and 25 GW peak.
• NYISO, New York State, around 20 million people and 32 GW peak.
• SPP, 14 central states from North Dakota to northern Texas, around 18 million people and 56 GW peak.

Parts of the Southeast and Northwest sit outside any RTO and rely on vertically integrated utilities and bilateral agreements. In those regions, outage response and capacity planning depend almost entirely on the local utility.

The 3,000+ U.S. utilities

When the lights go out, the company that actually sends crews into the field is the local distribution utility. There are around 3,000 of them in the U.S., split into three main categories with different governance, scale and reliability profiles.

Investor-owned utilities (IOUs)

About 170 companies serving roughly 72% of U.S. customers. They include PG&E, Duke Energy, FPL, Eversource, ConEd and most of the largest names on outage maps. They are private, for-profit, and regulated by state Public Utility Commissions (PUCs) that approve their rates and capital investments, including the budgets they spend on reliability and storm hardening.

Public power utilities (municipal)

About 2,000 entities serving 15% of customers, governed by local boards or city councils. Examples include LADWP (Los Angeles), MLGW (Memphis) and SMUD (Sacramento). Because they are accountable to a local government, decisions about undergrounding, vegetation management and outage communication are often more direct, but capital budgets are more constrained.

Rural electric cooperatives

Around 830 co-ops serving 13% of customers but covering nearly 56% of U.S. land area. They were created in the 1930s to electrify rural areas. Co-ops have long lines and few customers per mile, which makes them more exposed to weather damage and slower to restore. Examples include Pedernales Electric (Texas) and the wholesale generation co-op Tri-State G&T.

Reliability and the state of the grid

Aging infrastructure means more outages

Most of the U.S. grid was built between the 1950s and 1970s. Around 70% of transmission lines and large transformers are over 25 years old, and many have passed their 40 to 50 year design life. Older equipment fails more often, takes longer to replace (transformer lead times now run 1 to 3 years) and is harder to operate close to its limits during heat waves or cold snaps. This is the structural reason why outage frequency and duration have been trending up over the past decade, even before the surge in extreme weather.

How reliability is measured: SAIDI and SAIFI

Utilities report two key indicators to the U.S. Energy Information Administration (EIA):

• SAIDI measures the average outage duration per customer per year, in minutes.
• SAIFI measures the average number of outages per customer per year.

Reliability is reported in two flavors, with and without major events, because storms and other extreme weather have an outsized impact.

Why outages keep happening

Outages have a few recurring root causes, most of them concentrated on the distribution network:

• Severe weather: hurricanes and tropical storms (Gulf and East Coast), winter storms and ice (Midwest, Northeast, Texas), thunderstorms and tornadoes, heat waves that overload equipment.
• Vegetation: trees and branches falling on lines remain one of the single biggest causes of outages nationwide, and the main reason utilities run vegetation-management programs.
• Equipment failure: aging transformers, cables, switches and substations break down more often as the fleet gets older.
• Wildfire risk: in the West, utilities now proactively de-energize lines during high-risk weather (Public Safety Power Shutoffs), which prevents catastrophic fires but creates planned outages affecting hundreds of thousands of customers at a time.
• Supply and demand imbalances: heat domes, cold snaps and unexpected plant trips can force grid operators to call rolling blackouts, as seen in California in 2020 and in Texas in 2021.
• Animals, vehicles, accidents: cars hitting poles, animals contacting equipment, dig-ins on underground lines.
• Cyber and physical attacks: still rare but tracked closely by NERC, and the reason for tighter standards on critical substations.

Investments to reduce outages

The U.S. is in the middle of the largest grid modernization push in decades. Most of it is aimed, directly or indirectly, at preventing outages or restoring power faster after they happen.

Federal funding (2021 to 2026)est-ce qu

Utility capital expenditure

Investor-owned utilities are also accelerating their own capital plans. Industry-wide capex for U.S. electric utilities is now running at around $170 to $180 billion per year, with a growing share dedicated to outage prevention:

• Replacement of aging transmission lines, substations and transformers.
• Distribution hardening: stronger poles, undergrounding in fire-prone or storm-prone areas.
• Wildfire mitigation in California (PG&E, SCE, SDG&E), with covered conductors, sectionalizing devices and weather stations.
• Storm hardening on the Gulf and East coasts (FPL, Entergy, Duke, Dominion), with concrete poles and elevated substations.
• Grid software, sensors and outage management systems that detect and isolate faults faster.

Smart-grid innovations

Beyond replacing physical assets, utilities are deploying technology designed to detect outages faster, restore service automatically and reduce the impact on customers.

Smart meters and advanced metering infrastructure (AMI)

By 2024, more than 75% of U.S. customers had smart meters. AMI sends a "last gasp" signal when power is lost, so the utility knows about an outage before customers call in. After repair, smart meters confirm that power has been restored at every individual address, helping crews close out events faster.

Self-healing distribution networks

Utilities are deploying automated reclosers, sectionalizing switches and FLISR systems (Fault Location, Isolation and Service Restoration). When a fault occurs, these devices isolate the damaged segment and reroute power around it, often within seconds. A typical neighborhood outage that would have lasted an hour or more can now be limited to a few houses for a few minutes.

Grid-scale battery storage

Battery storage on the U.S. grid has grown from less than 1 GW in 2019 to over 30 GW of installed capacity, with the largest deployments in California and Texas. Batteries are increasingly used to ride through short interruptions, support the grid during stress events and replace fast-start peaker plants that used to be needed during heat waves.

Microgrids and virtual power plants

Hundreds of microgrids are now deployed at universities, hospitals, military bases and remote communities. They combine solar, batteries and backup generation to keep critical loads running during outages on the main grid. Distributed solar, demand response and home batteries are also being aggregated into virtual power plants (VPPs) that utilities can dispatch to avoid load-shedding events.

Wildfire and storm intelligence

Western utilities (PG&E, SCE, SDG&E, PacifiCorp) operate Public Safety Power Shutoff programs that proactively de-energize lines during high-fire-risk weather. They are paired with weather stations, AI-based fire-risk models, satellite imagery and high-definition cameras to detect ignitions early. On the storm side, utilities use predictive models to pre-position crews and equipment before a hurricane or ice storm reaches their territory.

Customer-facing services around outages

Outage maps and proactive alerts

Most major utilities publish public outage maps updated near real-time, plus SMS, email and app alerts with estimated restoration times. These tools have become a baseline expectation, especially in storm-prone states, and are usually the first place customers check when the power goes out.

Time-of-use and dynamic rates

Customers in California, Texas, New York and a growing number of other states can choose TOU plans that reward off-peak usage. Some utilities also pilot real-time pricing tied to wholesale market prices. Beyond saving money, these plans help reduce peak demand and the risk of supply-driven outages during heat waves and cold snaps.

Net metering and rooftop solar

Most states require utilities to offer net metering, allowing rooftop-solar customers to export surplus power for bill credits. Pairing solar with a home battery is the most effective way for residential customers to keep some power during a grid outage, and many utilities now offer specific incentives or tariffs to encourage that combination.

EV charging and managed charging

Utilities are rolling out public EV charging and managed-charging programs that reward off-peak charging. The goal is to keep the rapid growth in EV demand from creating new evening peaks that the grid cannot serve, especially in older neighborhoods where transformers were never sized for multiple EVs per street.

Energy-efficiency rebates

Many IOUs run state-mandated efficiency programs, offering rebates for heat pumps, smart thermostats, LED lighting, weatherization and induction cooktops. These programs are often co-funded with federal IRA tax credits. By reducing peak demand, they also reduce the strain on the grid during the events most likely to cause outages.