All-time record
Dirtiest half-hour
The most carbon-intensive half-hour on record - typically a still, dark winter evening in the coal era.
The record
644 gCO₂/kWh
Set 2012-03-13 05:30:00 UTC
Recomputed from NESO's historic half-hourly data whenever new history is ingested. Eras a fuel wasn't tracked are excluded - never counted as zero.