| Frequency response | £18.6k | 56.3% | |
| Balancing Mechanism | £13.1k | 39.9% | |
| Capacity Market | £2.2k | — | |
| Wholesale (metered-at-MID floor) | £1.3k | 3.9% |
Active-MW-day weighted over the 2025Q2-2026Q1 window across the metered GB battery fleet (168 BMUs / 6.7 GW registered). Frequency response remains the largest stream; the Balancing Mechanism is rising as FR saturates.
| Class | BM | FR | CM | cycles/day | spread |
|---|---|---|---|---|---|
| 1h | £8.5k | £20.1k | £2.7k | 0.80 | 26.0% |
| 2h | £12.3k | £15.2k | £4.8k | 0.92 | 23.2% |
| 4h | £-1.4k | £3.9k | — | 0.28 | 22.3% |
4h units are net BM payers (value lands in cheap charging); no 8h units exist in the GB fleet yet. Cycles/day measured from metered throughput.
| 2h class | 2025Q2 | 2025Q3 | 2025Q4 | 2026Q1 |
|---|---|---|---|---|
| Active fleet (GW) | 4.7 | 5.5 | 6.1 | 6.2 |
| Active BMUs | 117 | 130 | 143 | 149 |
| Cycles/day | 0.94 | 0.81 | 0.91 | 1.04 |
All figures are measured from public primary data — no third-party benchmark licence. Revenue is per MW of active capacity per year, active-MW-day weighted. The wholesale line is a metered-at-MID floor (metered volume × Elexon market index), not traded-position revenue — it embeds BM/FR throughput and losses, so it is a lower bound and reported separately. Balancing Mechanism from EBOCF bid-offer cashflows; Frequency Response from NESO EAC clearing × executed; Capacity Market on an initial-auction basis (awarded de-rated obligations x acquiring-auction clearing prices, delivery years overlap-weighted into the window; postcode fuzzy join to re…). Initial settlement; figures revise.