GB pumped hydro and other long-duration storage, measured from open settlement and auction data on the same conventions as the measured quarterly index — a monitor beside the index, never inside it: provisional, never graded, never a calibration target.
Technology-level aggregates are available to signed-in users on any plan — a free account is enough — and only for a technology with at least three distinct owners active in the quarter. Unit-level detail is not published. It is a licensed copy for your organisation; please do not redistribute.
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Public record, no sign-in needed: the pre-registration record · the measured quarterly index · the GB fleet & pipeline map.