How much electricity does one AI answer use? First ask which task was measured.

A figure for one kind of request is not a universal meter for AI. Read the task, measurement scope and date before multiplying it by your usage.

Our view: a useful discussion of AI’s environmental cost needs comparable measurements rather than one alarming or reassuring number. The IEA’s 2026 report explains that efficiency, adoption and changing tasks all shape demand; reasoning and video tasks can require much more electricity per request than simple text.

Ask what the number includes

Before using a per-request estimate, ask which model and task were measured, how long the input and output were, and whether the boundary covers only computation or a broader service. If those details are absent, label the comparison incomplete. This is our proposed reading checklist.

A small request does not settle the system’s impact

The IEA reports global data-centre electricity demand grew 17% in 2025, with AI-focused data centres growing faster. That is a sector-level change, not a measured footprint for your next message. A more efficient individual task and rising total demand can coexist.

Keep electricity and emissions distinct

A fictional calculation of 100 requests at an assumed 1 Wh each gives 100 Wh, or 0.1 kWh. The arithmetic is valid; the assumed rate is not a measurement of any service. Nor does this calculation produce a carbon footprint without additional information about electricity supply and measurement scope.

A practical decision without a pretend meter

Our recommendation is to choose the output your task needs, avoid generating unused variants, and seek relevant disclosures when evaluating a service. We have not quantified the savings from these choices. Neither one small estimate nor a large sector projection establishes that every AI use is harmless or wasteful.

Published October 14, 2026. This is an opinion column drawing on a 2026 IEA report and 2025 observations, not a new event report. Only the invented unit conversion was checked; no AI service’s electricity use or emissions were measured.

Sources: IEA · Energy and AI questions.