Who appears in supply, who appears in accepted actions, and how those recorded actions are distributed.
August 2026, with separately defined source clocks. The archive selection was fixed on 2 September; later source revisions are not substituted.
Share of the signed recorded generation sum, including net interconnector and pumped-storage values.
GB settlement dates: 1-31 August.
UTC interval: 31 July 23:00 to 31 August 23:00.
Share of observed event keys by frozen BM-unit category. One event key is counted once.
Earliest observed segment: August UTC.
Selected event records may extend across the month boundary.
Supply is not an action-count denominator. These distributions cannot be subtracted to measure who contributes more. Bar lengths are scaled separately within each distribution; printed percentages name the values.
The frozen high-confidence storage classification contains 69 identifiers; 53 have selected action records. This is not a census of all GB batteries or proof of physical identity throughout August.
Group event keys / all observed event keys
36.5%97,830 / 268,210
An event key is BMU + acceptance number. Its earliest segment observed in the selected files starts in the August UTC window. This is not a certificate of the event's global first segment.
Group start coordinates / all observed start coordinates
30.3%34,233 / 112,935
Distinct BMU + settlement date + starting settlement period, from the same selected events. Segments are not expanded into every period they cross; this is not duration, occupancy or service participation.
Group endpoint-area MWh / all selected endpoint-area MWh
3.9%120,728.4 / 3,059,783.5
Sum of (|start MW| + |end MW|) / 2 multiplied by segment hours, including retained cross-month segments. A trajectory approximation, not metered delivery or strictly within-month energy. Per-BMU areas are rounded before the share is formed.
Three separate denominators. No addition, subtraction, contribution ranking or combined score follows from placing these percentages together. Action count is not elapsed participation, and endpoint area is not physical delivery.
Each point uses its own day's event-key denominator. Date follows the earliest observed segment in UTC. A monthly share is a ratio of monthly counts, not the average of these percentages.
| UTC date | Group events | All events | Share |
|---|---|---|---|
| Aug 01 | 3,268 | 8,437 | 38.7% |
| Aug 02 | 1,604 | 3,678 | 43.6% |
| Aug 03 | 3,972 | 9,743 | 40.8% |
| Aug 04 | 4,040 | 12,396 | 32.6% |
| Aug 05 | 4,341 | 11,949 | 36.3% |
| Aug 06 | 3,300 | 8,632 | 38.2% |
| Aug 07 | 2,740 | 9,217 | 29.7% |
| Aug 08 | 2,713 | 10,417 | 26.0% |
| Aug 09 | 3,219 | 8,993 | 35.8% |
| Aug 10 | 3,489 | 9,274 | 37.6% |
| Aug 11 | 3,756 | 10,265 | 36.6% |
| Aug 12 | 3,486 | 9,093 | 38.3% |
| Aug 13 | 2,231 | 5,123 | 43.5% |
| Aug 14 | 2,542 | 6,259 | 40.6% |
| Aug 15 | 2,166 | 5,887 | 36.8% |
| Aug 16 | 2,695 | 6,113 | 44.1% |
| Aug 17 | 3,908 | 9,937 | 39.3% |
| Aug 18 | 4,106 | 10,990 | 37.4% |
| Aug 19 | 2,953 | 8,053 | 36.7% |
| Aug 20 | 3,001 | 8,896 | 33.7% |
| Aug 21 | 3,039 | 8,130 | 37.4% |
| Aug 22 | 4,516 | 12,255 | 36.9% |
| Aug 23 | 5,084 | 12,616 | 40.3% |
| Aug 24 | 2,379 | 7,230 | 32.9% |
| Aug 25 | 2,548 | 7,354 | 34.6% |
| Aug 26 | 3,410 | 9,811 | 34.8% |
| Aug 27 | 2,380 | 7,065 | 33.7% |
| Aug 28 | 3,305 | 8,989 | 36.8% |
| Aug 29 | 1,901 | 5,323 | 35.7% |
| Aug 30 | 2,208 | 5,917 | 37.3% |
| Aug 31 | 3,530 | 10,168 | 34.7% |
The other two measures use settlement coordinates or segment duration. They are not overlaid on this UTC-date line. No dispatch cause, persistent trend or asset condition is inferred.
BM-unit identifiers with selected events
Concentration-equivalent identifier count
The second value is 1 / sum(squared event-count shares). It describes the concentration of this count distribution; it is not a count of identified units, independent resources or available replacements.
682,241 BOALF rows / 29,760 FUELHH rows were reopened from the fixed source set.
Both source sets contain a file for every August date. FUELHH contains every August half-hour coordinate for every fuel type encountered. This does not certify omitted upstream categories, embedded generation or whole-event completeness.
128 retained BOALF segments extend beyond the UTC month. The area measure belongs to the selected action-record set; it is not a strictly clipped August total. Separate clocks are retained rather than silently aligned.
Endpoint area is calculated from declared MW endpoints and duration. Signed endpoints and rounding differences are retained in the internal audit. No settlement metering, BMS or SCADA delivery is asserted.
Asset health, wear, cyber exposure, independent reserve paths, dispatch motives and system resilience. Frequency, metering, contracts and disclosures are not silently used as explanations for these charts.