New York City does experience blackouts, though citywide events are rare. The most famous hit on July 13, 1977, when lightning strikes knocked out transmission lines and a nuclear plant tripped offline, plunging the entire city into darkness. Smaller, localized outages happen more regularly, driven by summer heat, aging infrastructure, and severe weather. Here’s what the city’s power grid actually looks like today and what risks lie ahead.
How Reliable NYC’s Grid Is Right Now
Con Edison, the utility serving most of New York City, runs one of the most reliable grids in the country. In 2024, the average Con Edison customer experienced a power interruption about once every nine years during normal conditions (excluding major storms). That frequency rate of 0.11 interruptions per customer is roughly five times better than the statewide average of 0.59, and nearly nine times better than the rest of New York State’s utilities, which averaged 0.97.
The tradeoff is that when outages do hit the city’s dense underground network, they can take longer to fix. Outages on Con Edison’s underground network system lasted an average of 6.2 hours in 2024, compared to about 1.9 hours on the above-ground radial systems that serve the outer boroughs and suburbs. The underground cables that power Manhattan and other dense neighborhoods are harder to access and repair, but they fail far less often in the first place.
What Causes Outages in New York
Summer heat is the city’s biggest recurring threat. Air conditioning drives electricity demand to extraordinary levels. During a June heatwave, demand on New York’s statewide grid hit 31,857 megawatts, the highest peak since 2016. Without energy-saving programs and battery storage kicking in, demand would have reached roughly 33,410 MW, dangerously close to the all-time record of 33,956 MW set in 2013. When demand pushes against the grid’s ceiling, equipment overheats, transformers fail, and localized blackouts follow.
Severe storms are the other major culprit. The reliability numbers above exclude major storm events for a reason: hurricanes, nor’easters, and intense thunderstorms can knock out power to hundreds of thousands of customers at once. These events sit in a different category from the everyday equipment failures that utilities are graded on. Lightning was the direct trigger of the 1977 blackout, when two separate strikes disabled transmission lines connecting the city to power plants to the north. Human error compounded the problem as operators scrambled to respond.
The 2033 Reliability Gap
New York City faces a projected power shortfall starting in the summer of 2033. The state’s grid operator, NYISO, identified this in its 2024 reliability assessment. The gap is driven by a combination of growing electricity demand, the planned retirement of older gas-fired “peaker” plants under state environmental rules, and limited new supply coming online fast enough to replace them.
The initial shortfall looks small: 17 MW for one hour in 2033, growing to 97 MW over three hours by 2034. But those numbers assume everything goes according to plan. Under less favorable conditions, like higher-than-expected demand from the electrification of heating and transportation, the gap could balloon to over 1,000 MW by 2034. That’s enough missing power to serve roughly 200,000 to 300,000 homes.
One critical variable is the Champlain Hudson Power Express (CHPE), a planned transmission line that would deliver hydroelectric power from Canada directly into New York City. If that project isn’t operational during summer peaks, the city’s power deficit could start as early as 2026 and reach 797 MW by 2034. The retirement of major generating stations like the Ravenswood complex in Queens would make the situation worse, potentially creating transmission security problems starting in 2025.
How the City Is Building Backup Capacity
New York State is betting heavily on battery storage to fill gaps during peak demand. The state’s targets are 1,500 MW of energy storage by 2025 and 6,000 MW by 2030. To hit those numbers, the state energy authority has received bids for 46 projects totaling roughly 6,000 MW of power capacity and 30,000 MWh of energy storage. It plans to award about 1,000 MW in its current round of contracts, spread across residential, commercial, and large-scale installations.
Battery storage works as a buffer: it charges when electricity is cheap and abundant, then discharges during the afternoon and evening peaks when air conditioners strain the grid. During that recent June heatwave, stored energy and demand-reduction programs were already making a measurable difference, shaving over 1,500 MW off what peak demand would have been otherwise.
What to Do During an Outage
If you lose power in New York City, Con Edison’s outage line is 1-800-75-CONED. You can also report outages and track restoration online at conEd.com. For real-time text updates, text “REG” to 688243 (OUTAGE) and follow the prompts, or sign up for notifications at conEd.com/text. These tools show estimated restoration times and let you confirm whether the utility already knows about the outage in your area.
Localized outages in summer, lasting a few hours in a specific neighborhood, are the most common scenario. Citywide blackouts on the scale of 1977 are extraordinarily unlikely given the grid improvements made since then, including redundant transmission paths and automated load-shedding systems that sacrifice small areas to protect the broader network. The realistic risk for most New Yorkers isn’t a dramatic blackout but rather a hot July evening where a local transformer gives out and the lights go dark for a few hours.