How much energy does one ChatGPT prompt really use?

The most quoted figure comes from Sam Altman himself. In his June 2025 blog post The Gentle Singularity, he wrote that the average ChatGPT query uses about 0.34 watt-hours: "about what an oven would use in a little over one second, or a high-efficiency lightbulb would use in a couple of minutes." He added a water…

Is Google's 0.24 Wh per Gemini prompt a credible number?

Google's figure is the strongest of the three, because it is measured, not estimated. In August 2025, Google published a technical paper, Measuring the environmental impact of delivering AI at Google scale, reporting that the median Gemini Apps text prompt consumed 0.24 Wh of energy, emitted 0.03 grams of CO2…

What does 0.34 Wh actually look like in daily life?

Numbers with 21 zeros do not persuade anyone, so let us convert. A prompt at 0.34 Wh equals about two minutes of a 10 W LED bulb. The IEA's fact-check of streaming numbers estimated one hour of Netflix at roughly 0.077 kWh, which makes one ChatGPT prompt worth about 16 seconds of streaming, and one Gemini prompt…

If one prompt is so cheap, why will data centers burn 945 TWh in 2030?

Because cheap is exactly the problem. The IEA's Energy and AI report estimates data centers consumed around 415 TWh in 2024, about 1.5% of global electricity. Its base case projects around 945 TWh by 2030, just under 3% of global consumption, growing about 15% per year, four times faster than every other sector…

What is the minimum energy physics allows for computation?

There is a floor, and it is astonishingly far below us. In 1961, IBM's Rolf Landauer showed that erasing one bit of information must dissipate at least kT ln 2 of heat. At room temperature that is about 3 zeptojoules, 3 x 10^-21 joules, per bit operation. Not a hardware limitation: a law of thermodynamics,…

How Much Energy Does One AI Prompt Really Use | Kevin Escoda

Verified numbers on AI energy consumption per prompt: 0.34 Wh for ChatGPT, 0.24 Wh for Gemini, the physics floor, and why totals still explode.

Everyone has an opinion on AI energy consumption. Almost nobody has a number. So here are the numbers: a median text prompt on a frontier model costs somewhere between 0.24 and 0.34 watt-hours of electricity. That range is not my guess. It comes from the only two first-party figures ever published: Sam Altman's 0.34 Wh per average ChatGPT query, and Google's measured 0.24 Wh median for a Gemini text prompt. An independent estimate from Epoch AI lands in the middle at roughly 0.3 Wh.

In everyday terms, one prompt is about two minutes of a 10-watt LED bulb, roughly 16 seconds of Netflix streaming, or one second of an electric oven. Boiling a liter of water for pasta costs about as much as 300 ChatGPT prompts. Whatever guilt you have been carrying about asking a chatbot for a recipe, you can drop it.