Summary
The week from Thursday 3 September to Tuesday 8 September averaged about 26.1 GW of measured generation, with renewables averaging 55.1% of measured output. The strongest renewable day in the available data was Tuesday 8 September, when wind, solar and hydro together averaged 56.8% of measured generation. Gas was highest on Tuesday 8 September and lowest on Thursday 3 September.
For flexible electricity use, the cleanest opportunities are likely to appear when wind is strong, gas is low and demand is not at a peak. This is the foundation for future EV-charging guidance, clean-electricity alerts and weekly newsletter summaries.
The reporting period in key numbers
| Average measured generation | ~26.1 GW across available settlement-period aggregates |
|---|---|
| Average renewable share | 55.1% |
| Highest renewable share | 56.8% on Tuesday 8 September |
| Highest average wind output | ~13.3 GW on Tuesday 8 September |
| Highest average solar output | ~4.0 GW on Saturday 5 September |
| Highest average gas output | ~5.4 GW on Tuesday 8 September |
What the reporting-period figures show
- Renewables were strongest on Tuesday 8 September, when wind, solar and hydro averaged 56.8% of measured generation.
- Wind was the largest swing factor in the available feed, peaking at about 13.3 GW average output on Tuesday 8 September.
- Solar was strongest on Saturday 5 September, averaging about 4.0 GW across settlement periods after embedded-solar backfill where needed.
- Gas averaged about 4.2 GW across the period, rising highest on Tuesday 8 September and falling lowest on Thursday 3 September.
- Measured generation was highest on Friday 4 September, at roughly 27.9 GW average output.
Renewable and gas comparisons — not carbon rankings
Best low-carbon proxy: Tuesday 8 September
Historical carbon-intensity aggregates are not yet part of this weekly report feed, so EnergyMix.info uses renewable share and gas output as cautious proxies. Tuesday 8 September had the strongest renewable share at 56.8%.
Lowest gas proxy: Thursday 3 September
Gas generation averaged about 3.5 GW on Thursday 3 September. Lower gas periods are often cleaner, but the report does not yet claim this was the lowest-carbon period without historical carbon-intensity validation.
Higher gas output — not a carbon measurement
Highest gas proxy: Tuesday 8 September
Gas averaged about 5.4 GW on Tuesday 8 September. Gas-heavy periods are usually higher-carbon, but this is labelled as a proxy until historical carbon-intensity highs/lows are added to the report feed.
Wind, solar and gas highlights
Wind
Highest average wind output was about 13.3 GW on Tuesday 8 September.
Solar
Highest average solar output was about 4.0 GW on Saturday 5 September.
Gas
Highest average gas output was about 5.4 GW on Tuesday 8 September; lowest was about 3.5 GW on Thursday 3 September.
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Data notes
Compiled by Energy Mix from Elexon generation data and NESO embedded-generation estimates. Energy Mix calculates the totals, averages and comparisons shown here. Source data may be revised. Source attribution does not mean that Elexon or NESO has reviewed or endorsed this report.
Sources: Elexon Insights FUELHH; NESO Historic GB Generation Mix; NESO Demand Data Update. These datasets can share underlying observations; agreement is not independent certification.
Renewable-share and gas-output comparisons are not measurements of carbon intensity. See data sources and methodology for source information. A report-specific reproducible evidence pack was not preserved for this publication.
Original publication introduction and methodology note
A measured weekly report for EnergyMix.info using the available 7-day historical generation feed for Thursday 3 September to Tuesday 8 September.
This report is generated from the available 7-day historical generation feed and validated against external public data. Carbon-intensity highs/lows and interconnector summaries should be treated as future additions unless they are present as validated historical aggregates.
Preserved as part of the original publication. Any broad validation wording in this note should not be read as proof that all reporting days or narrative claims were checked.
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