AI's power hunger hits records, and the grid runs into a hard truth about "capacity"

American electricity use will smash records in 2026 and 2027, the government’s Energy Information Administration said this week [1]. The driver is AI and crypto data centres that run around the clock [1]. Demand is set to climb from a record 4,195 billion kilowatt-hours in 2025 to 4,391 billion by 2027 [1]. Meeting that hunger has reopened an old fight the transition kept quiet. The question is not how much power a source can make flat out. It is how much it can be counted on to deliver, hour by hour.

That gap is now shaping policy on three continents. In Texas, solar and batteries are winning on price, and renewables make up 70% of new generation coming to the grid. Republican lawmakers floated a rule forcing a set share of new supply to be “dispatchable” - gas plants that can ramp up on command, unlike wind and solar [2]. The grid operator’s own chief made the mechanism plain. ERCOT pays plants for the energy they actually deliver, not for standing by [2]. Cheap zero-fuel renewables supply all they can whenever the sun and wind allow, leaving gas to fill what’s left [2]. In Kenya, the national utility warned this week that variable wind and solar now top 20% of grid capacity [3]. That is past the 15% many operators treat as a comfort ceiling. At peak they can hit 34% of the mix, “exposing the national grid to system vulnerability when wind and solar suddenly dip or rise” [3].

The reckoning cuts against the “firm” sources too. In northern France, a swarm of jellyfish clogged the cooling intakes at Gravelines, one of Europe’s biggest nuclear stations [4]. Its six reactors are rated 900 megawatts each, 5.4 gigawatts in all. The swarm knocked three reactors offline and cut a fourth to half power overnight [4]. Nuclear normally runs flat out about 90% of the year. For a night, one of the continent’s steadiest machines delivered a fraction of its nameplate [4]. The lesson runs the other way for renewables, which is why the milestones need reading with care. Utah drew more power from solar than any other source for the first time ever in May [5]. That was nearly a terawatt-hour, about a third of the state’s electricity - a real achievement, and one that says nothing about 2am in January.

The demand driving all this is concentrated and enormous. Texas’s governor paused new data-centre approvals on August 3, prompting the EIA to cut its 2027 Texas demand-growth forecast from 14% to 6% [1]. The state’s grid queue holds about 474 gigawatts of interconnection requests - more than five times its record peak demand [6]. Roughly 90% are data centres [6]. Analysts estimate AI computing earns around $1.76 billion per gigawatt per month, so delay is expensive [6]. Amazon is now backing a gas-burning plant for a Texas data centre that critics warn could become the most polluting power station in the US [7]. It is part of a wider build-out whose air-quality toll researchers are only beginning to price [8].

The physics has a name in the science too. A Nature Geoscience study this week modelled “renewable energy droughts” - stretches of low wind and weak sun [9]. In a high-renewables China of the 2050s, fossil plants would cover those gaps. Even with the best filters, they could raise deadly fine-particle pollution 15-40% during the shortfalls [9]. The gap between what renewables are rated to make and what they deliver on a still, cloudy week is not an accounting quirk. It is a public-health variable.

None of this is an argument against clean power, which keeps winning on cost. It is an argument about how a grid is built. The honest answer to intermittency is storage - batteries that soak up cheap midday solar and pour it back at dusk. New models are spreading fast. An Austin startup now rents households an oversized backup battery for about the price of a streaming subscription, then leans on the fleet to steady the local grid [10]. Cheaper sodium-ion cells are closing on the energy density that made lithium the default [11]. But building enough of it takes time the demand curve isn’t offering. That is why the Energy Department keeps ordering old coal plants to stay open past their retirement dates [12]. And it is why the same government that slapped fresh tariffs on imported solar panels [13] is presiding over a renewables boom it can slow but not stop. The grid of the next decade will be built in the space between a power source’s rated capacity and the fraction of it you can actually bank on.