The cleanest hour to use power

Carbon intensity swings sixfold across a day. Here is when.

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Data access

Use the machine-readable JSON record or the flattened CSV download or the compact Markdown version.

Methodology

Forecast carbon intensity for the London region over the next 24 hours, in half-hour settlement periods, from National Grid ESO. A forecast rather than a measurement — it is what the grid expects, and it moves with the wind.

Provenance

Cadence
live
Engine
timeline
Licence
CC BY 4.0

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