Summary
The week from Wednesday 15 July to Monday 20 July averaged about 23.0 GW of measured generation, with renewables averaging 42.1% of measured output. The strongest renewable day in the available data was Sunday 19 July, when wind, solar and hydro together averaged 56.0% of measured generation. Gas was highest on Thursday 16 July and lowest on Saturday 18 July.
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 | ~23.0 GW across available settlement-period aggregates |
|---|---|
| Average renewable share | 42.1% |
| Highest renewable share | 56.0% on Sunday 19 July |
| Highest average wind output | ~7.0 GW on Saturday 18 July |
| Highest average solar output | ~5.0 GW on Thursday 16 July |
| Highest average gas output | ~11.6 GW on Thursday 16 July |
What the reporting-period figures show
- Renewables were strongest on Sunday 19 July, when wind, solar and hydro averaged 56.0% of measured generation.
- Wind was the largest swing factor in the available feed, peaking at about 7.0 GW average output on Saturday 18 July.
- Solar was strongest on Thursday 16 July, averaging about 5.0 GW across settlement periods after embedded-solar backfill where needed.
- Gas averaged about 7.2 GW across the period, rising highest on Thursday 16 July and falling lowest on Saturday 18 July.
- Measured generation was highest on Thursday 16 July, at roughly 26.9 GW average output.
Renewable and gas comparisons — not carbon rankings
Best low-carbon proxy: Sunday 19 July
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. Sunday 19 July had the strongest renewable share at 56.0%.
Lowest gas proxy: Saturday 18 July
Gas generation averaged about 2.9 GW on Saturday 18 July. 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: Thursday 16 July
Gas averaged about 11.6 GW on Thursday 16 July. 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 7.0 GW on Saturday 18 July.
Solar
Highest average solar output was about 5.0 GW on Thursday 16 July.
Gas
Highest average gas output was about 11.6 GW on Thursday 16 July; lowest was about 2.9 GW on Saturday 18 July.
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 Wednesday 15 July to Monday 20 July.
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.