Quarterly GB BESS Index — 2025Q3-2026Q2
The measured GB battery-fleet revenue record, built from open Elexon & NESO data — no third-party benchmark licence, every convention disclosed.
The Balancing Mechanism now takes 18% of measured fleet revenue against 65% for frequency response & reserve. A £86k/MW·yr BM gap separates the best and worst TNUoS zones, and top-quartile units out-earn the median by tens of £k — the full report shows where.
inside: the rotation · per-unit distribution · duration classes · zonal split · full methodology
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