Turn Off Your AC. Now Buy an Electric Car. Same Grid.
On July 2, 2026, as Central Park hit 100 degrees for the first time in fourteen years, New York City Mayor Zohran Mamdani (D) posted a request to eight million residents: set your air conditioner to 78 degrees, turn off the lights, and unplug what you can. The power grid, he wrote, was “working overtime.” Con Edison was already cutting voltage in the Bronx and Manhattan.
Here is the contradiction that request papers over. The same city and state government asking New Yorkers to ration cooling in July has, by law, ordered them onto that identical grid for almost everything else — electric cars by 2035, all-electric new buildings, heat pumps instead of gas furnaces, induction ranges instead of stoves. The mandates pile enormous new demand onto a network its own operator says is already running on the thinnest reliability margin in recent history.
This is not a partisan talking point. It is arithmetic — and New York’s own grid operator, the NYISO, has spelled it out in filing after filing.
- 417MWNYISO summer reliability margin — the lowest in recent history, down from 2,227 MW in 2019
- 78°Fthe AC setting Mayor Mamdani (D) asked New Yorkers to accept mid-heat-wave — Con Edison also urged limiting A/C
- 3×capacitythe generating build-out the state's own plan says is needed by 2040 to electrify — 37 GW today toward 111–124 GW
- 100%of salesshare of new cars that must be zero-emission by 2035 under Advanced Clean Cars II — 35% required in 2026
- $268per tonannual Local Law 97 fine on buildings over their carbon cap — designed to force electrification
The heat wave that gripped the Northeast over the July Fourth weekend was, by the numbers, historic. Central Park reached 100 degrees on July 2 — tying a mark last set in 1966 and the first triple-digit reading there in fourteen years — with a heat index above 110 in the hottest spots. More than 200,000 customers across the region lost power; at least 19,000 of them were Con Edison customers in and around New York City, according to the utility’s outage map.
Two separate conservation appeals went out, and it is worth attributing each one precisely. The regulated utility, Con Edison, issued the operational appeal: it reduced voltage in parts of the Bronx and Manhattan “to conserve energy during equipment repairs” and asked customers to limit the use of multiple air conditioners and large appliances between 2 and 10 p.m. Separately, Mayor Zohran Mamdani (D) — the sitting mayor of New York City since January 2026 — made the ask personal, posting on X that the grid was “working overtime” and urging residents to set their thermostats to 78, kill unused lights and electronics, and unplug what they could. City Hall said it was following its own advice, holding municipal buildings at 78 and dimming lights at peak demand.
New York: it's hot out there, and the power grid is working overtime to keep us cool. Set your AC to 78 degrees, turn off lights/electronics you're not using, and unplug what you can.
Set aside the politics of the messenger for a moment. Asking people to trim discretionary load during a once-in-a-decade heat event is, in isolation, ordinary grid management — the U.S. Department of Energy itself suggests 75 to 78 degrees in summer. The problem is not the request. The problem is what the same government is simultaneously ordering everyone to plug in.
The New York Independent System Operator — the NYISO, which actually keeps the lights on — does not editorialize. It publishes reliability margins. And those margins have collapsed. Under baseline summer conditions, the statewide reliability margin now stands at roughly 417 megawatts, which the NYISO calls the lowest in recent history. In 2019 that cushion was 2,227 megawatts, about 17 percent. Today it is around 9 percent and shrinking.
The stress test is worse. The NYISO models that under a heat wave averaging 95 degrees for three or more days — precisely the kind New York just lived through — the statewide capacity margin swings to roughly negative 1,679 megawatts. Under an extreme 98-degree event, it falls to about negative 3,370 megawatts. Negative margin is the polite grid-operator term for “not enough power,” the condition that precedes rolling blackouts. The operator has flagged a reliability deficit for New York City and Long Island beginning in the summer of 2026.
“One day New York's electricity system is going to blow a fuse.”
Empire Center for Public Policy · 'A Warning for New York's Energy Policy'
Why is the cushion vanishing? The NYISO names three drivers: aging generation, transmission constraints, and — in its own words — the “increased electrification of the transportation and building sectors,” compounded by the retirement of fossil-fuel plants under state emissions limits. The grid operator now expects New York to become a winter-peaking system within the decade as cars and buildings electrify. Electricity demand statewide could grow as much as 90 percent by 2042. New York is not adding cushion. It is legislating the cushion away.
Albany is behaving as if New York has an endless supply of cheap electricity — enough to heat every home, electrify every car and bus, and still power data centers and chip fabs. The NYISO's own filings say otherwise. The margin is gone.
The demand piling onto that thinning grid is not an accident of the market. It is policy — a stack of overlapping mandates enacted by New York’s Democratic-run city and state governments, each one moving a category of energy use from gas or gasoline onto electricity.
Advanced Clean Cars II (NYS DEC, adopted 2022): New York adopted California’s rule requiring zero-emission vehicles to be 35 percent of new car sales in model year 2026, ramping to 100 percent by 2035. Every one of those cars charges off the grid.
Local Law 154 (NYC, 2021): the “All-Electric New Buildings” law bans on-site fossil-fuel combustion in new construction — no gas heat, no gas hot water, no gas stoves — phasing in by building height starting 2024. A statewide version, the All-Electric Building Act, would extend it.
Local Law 97 (NYC, in force 2024): caps carbon emissions on buildings over 25,000 square feet and fines overages at $268 per metric ton, every year. Limits tighten roughly 50 percent in 2030 — a design meant to push owners off gas and onto electric heat pumps.
CLCPA (NYS, 2019): mandates 70 percent renewable electricity by 2030, a zero-emission grid by 2040, and net-zero emissions by 2050 — the legal engine behind the plant retirements.
Each mandate, on its own, is defensible on climate grounds. Read together, they describe a plan to route the state’s heating, cooking, and driving onto a single electrical network — while that network’s operator warns it cannot reliably carry the load it already has on a hot afternoon. New York’s own Climate Action Council Scoping Plan concedes the scale of the problem: to electrify on schedule, the state needs roughly a three-fold increase in generating capacity by 2040, from about 37 gigawatts today to between 111 and 124. At least 95 gigawatts of that must be new. Over the prior two decades, New York built less than 13.
You cannot mandate electric cars, electric heat, and electric everything, retire your firm generation, and then ask people to switch off the AC when it gets hot. That is not an energy policy. That is a countdown to rationing.
The mayor asking New Yorkers to unplug is, in the same season, working hard to get them to plug more in. In March 2026, the Mamdani administration — together with the city Department of Transportation and the New York Power Authority — opened a public EV fast-charging station in Flushing, Queens, featuring eight 360-kilowatt chargers, each powerful enough to refill a car battery in ten to fifteen minutes. It was billed as the first of ten such sites planned within a year. Eight 360-kilowatt chargers is nearly three megawatts of new peak draw at a single lot.
Mamdani’s broader energy platform points the same direction. As a state assemblyman he co-sponsored and helped pass the 2023 Build Public Renewables Act; as a candidate and mayor he has campaigned to shut down fossil-fuel “peaker” plants — the very units the NYISO leans on during heat waves — and to oppose new gas infrastructure in the city. His “Green Schools” plan would put renewable systems and electric HVAC into 500 public schools. Every plank adds electric load or subtracts firm supply. None of it adds the 95 gigawatts of new generation the state’s own plan says the grid needs first.
That is the accountability point, stripped of heat: you cannot close the peaker plants that save you in a heat wave, mandate the cars and buildings that will draw more power in that same heat wave, and then treat “set your AC to 78” as a solution. The 78-degree ask is a symptom of the plan, not a fix for it.
The post detonated. Fox News reported it was seen more than 36.5 million times as Republican officials cast it as a live demonstration of where the electrification agenda ends. Florida Gov. Ron DeSantis (R) asked on X whether this was “what was meant by the warmth of collectivism.” Arkansas Gov. Sarah Huckabee Sanders (R) wrote that “turns out socialism actually isn’t free.” On “The Five,” Greg Gutfeld called the mayor a “socialist brat… coming for your thermostat.”
President Donald Trump (R), who has spent the spring branding Mamdani a “communist,” folded the thermostat episode into that theme on Truth Social. The rhetoric ran hot in both directions — Obama adviser David Axelrod defended the mayor, noting that a request to moderate usage so the grid holds and “ACs keep running seems like a responsible thing to do.” He is not wrong about the request. He is answering a narrower question than the one that matters.
The Communists are finally making their move. I've been waiting and preparing for this for a long time. New York can't even keep the air conditioning on.
Paraphrased commentary · not a verbatim post
Trump on Truth Social · paraphrased, on the Mamdani-backed New York primary wins
Mamdani is a Communist Lunatic. He'll turn the greatest city in the world into a place where you can't drive a car, can't heat your home with gas, and now can't run your air conditioner. Total disaster.
Paraphrased commentary · not a verbatim post
Trump on Truth Social · paraphrased characterization of Mamdani's agenda
Strip out the name-calling on both sides and a real question survives: is it responsible to legislate a doubling of electric demand onto a grid your own operator says is already short, and then manage the resulting scarcity by asking residents to sweat through a heat wave? The mockery landed because the underlying tension is genuine, not because 78 degrees is scandalous.
The most telling evidence that the grid math is real comes not from the critics but from the mandate’s own authors. In November 2025, Gov. Kathy Hochul (D) quietly postponed implementation of the statewide All-Electric Building Act, pending litigation. In the fiscal-year 2027 budget agreement announced May 7, 2026, Albany moved to soften the CLCPA itself — replacing the law’s binding 2030 emissions target with a looser 2040 benchmark. When the people who wrote the timeline start slipping the timeline, that is a tell.
The mandates that remain, though, still push in one direction. A federal appeals court upheld New York’s gas-appliance ban in the summer of 2026, keeping Local Law 154 and the state Electric Building Act on the books. Advanced Clean Cars II still requires 100 percent zero-emission new-car sales by 2035. Local Law 97’s fines still bite in 2024 and bite harder in 2030. The demand curve those laws draw still points up — and the generation curve, as the NYISO keeps repeating, does not keep pace.
Build firm capacity first. The Scoping Plan’s own math requires ~95 GW of new generation by 2040. Until it exists, every new mandate lands on a grid the operator already rates short.
Sequence the mandates to the wires. Retiring peaker plants before their replacements are online is what turns a hot afternoon into a voltage reduction.
Be honest about the ask. “Set your AC to 78” is not a stopgap during a transition — on the current build-out pace, NYISO’s numbers say it is a preview of the destination.
New York is asking its residents to unplug in July and to electrify everything by 2035 — on the same wires, at the same time. The NYISO says the margin is already gone; the state’s own plan says the grid needs to triple in fifteen years to carry what the law now requires; and the officials who wrote the deadlines are already quietly moving them. The heat wave did not expose a bad social-media post. It exposed the physics the mandate has been outrunning. Until New York builds the power before it forces the demand, “set your AC to 78” is not conservation advice. It is the plan.
