Summary
The week from Sunday 16 August to Friday 21 August averaged about 25.0 GW of measured generation, with renewables averaging 31.0% of measured output. The strongest renewable day in the available data was Friday 21 August, when wind, solar and hydro together averaged 40.4% of measured generation. Gas was highest on Monday 17 August and lowest on Friday 21 August.
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 | ~25.0 GW across available settlement-period aggregates |
|---|---|
| Average renewable share | 31.0% |
| Highest renewable share | 40.4% on Friday 21 August |
| Highest average wind output | ~7.6 GW on Tuesday 18 August |
| Highest average solar output | ~3.3 GW on Friday 21 August |
| Highest average gas output | ~13.0 GW on Monday 17 August |
What the reporting-period figures show
- Renewables were strongest on Friday 21 August, when wind, solar and hydro averaged 40.4% of measured generation.
- Wind was the largest swing factor in the available feed, peaking at about 7.6 GW average output on Tuesday 18 August.
- Solar was strongest on Friday 21 August, averaging about 3.3 GW across settlement periods after embedded-solar backfill where needed.
- Gas averaged about 9.8 GW across the period, rising highest on Monday 17 August and falling lowest on Friday 21 August.
- Measured generation was highest on Tuesday 18 August, at roughly 28.5 GW average output.
Renewable and gas comparisons — not carbon rankings
Best low-carbon proxy: Friday 21 August
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. Friday 21 August had the strongest renewable share at 40.4%.
Lowest gas proxy: Friday 21 August
Gas generation averaged about 7.2 GW on Friday 21 August. 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: Monday 17 August
Gas averaged about 13.0 GW on Monday 17 August. 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 7.6 GW on Tuesday 18 August.
Solar
Highest average solar output was about 3.3 GW on Friday 21 August.
Gas
Highest average gas output was about 13.0 GW on Monday 17 August; lowest was about 7.2 GW on Friday 21 August.
Weekly brief
Get this as a weekly brief
The newsletter turns reports like this into a short weekly summary of renewables, gas, carbon intensity, records and cleaner electricity windows.
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 Sunday 16 August to Friday 21 August.
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.
Related pages
Weekly brief
Get the weekly UK electricity mix briefing
A short, source-backed brief on renewables, gas, carbon intensity, records and cleaner electricity windows.
Need this for a site or product?
EnergyMix.info is also testing lightweight publisher widgets and selected data access for partners.