Summary
The week from Monday 18 May to Saturday 23 May shifted from gas-heavy weekdays into a cleaner, wind-led weekend. The strongest renewable day in the available data was Tuesday 19 May, when wind, solar and hydro together averaged 64.6% of measured generation across settlement periods. Gas was highest on Monday 18 May and lowest on Tuesday 19 May.
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 | ~23.7 GW across available settlement-period aggregates |
|---|---|
| Highest renewable share | 64.6% on Tuesday 19 May |
| Highest average wind output | ~14.4 GW on Tuesday 19 May |
| Highest average solar output | ~4.7 GW on Friday 22 May |
| Highest average gas output | ~11.4 GW on Monday 18 May |
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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 Monday 18 May to Saturday 23 May.
No report-specific methodology note was preserved.
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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