European Grid Index
How clean the grid is for European data centres, month by month
In the September 2026 issue, published on 15 October 2026, Norway (NO2) had the cleanest grid of 12 European power markets at 24 g CO₂e/kWh, and Poland the most carbon per kWh at 547 g. Each issue is one monthly reading of grid carbon intensity for a constant load, and what a load that can wait would have avoided, with the same method every month so the issues compare.
September 2026
- Cleanest grid
- Norway (NO2)
- 24 g
- Grid Index,
- Most carbon per kWh
- Poland
- 547 g
- Grid Index,
- Cleaner than a year earlier
- 3 of 12 markets
- Sep 2025 to Sep 2026
- Grid Index,
Grid carbon intensity, September 2026
Monthly mean seen by a constant load, g CO₂e/kWh, cleanest first.
- 1Norway (NO2) 24 g Sep 2025:23 On the year:+5%
- 2Sweden (SE3) 30 g Sep 2025:24 On the year:+25%
- 3France 36 g Sep 2025:24 On the year:+51%
- 4Finland 54 g Sep 2025:52 On the year:+4%
- 5Austria 77 g Sep 2025:53 On the year:+44%
- 6Great Britain 154 g Sep 2025:166 On the year:−7%
- 7Spain 154 g Sep 2025:136 On the year:+13%
- 8Ireland 234 g Sep 2025:250 On the year:−7%
- 9Belgium 250 g Sep 2025:123 On the year:+103%
- 10Italy (North) 324 g Sep 2025:296 On the year:+10%
- 11Germany 348 g Sep 2025:303 On the year:+15%
- 12Poland 547 g Sep 2025:562 On the year:−3%
Computed but not ranked: the Netherlands, Switzerland and Denmark (DK1). The issue explains why.
Every issue
A new issue on the third of each month, covering the month before.
- September 2026published 15 October 2026
How the Index is built
- Each hour, every fuel’s output in a market is multiplied by a lifecycle emission factor and divided by total output. The month’s figure is the mean of those hours.
- Production-based: imports are not counted, and pumped-storage output is left out.
- An hour counts only when every material fuel reports in it; a market needs 80% of its hours to be ranked.
- The flexible-load figures in each issue are an upper bound with perfect foresight.
Source: ENTSO-E Transparency Platform; NESO Carbon Intensity API, CC BY 4.0. Calculations DC Blueprint. Cite as: DC Blueprint, European Grid Index for data centres, with the issue’s month and link.