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N84 Grid

Cilfynydd BESS

Developer as published, connection site, reference: Cilfynydd BESS Limited. Cilfynydd 400kV Substation (NGET). PRO-002756.

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Capacity349.9 MWBattery storage, Gate 1
Connection date15 Sep 2037Status as printed: Scoping
First date seen 15 Oct 2037, difference -30 dayscalculated by N84
MW ahead in N84's order at this site1,842.8 MWcalculated by N84

Connection date, edition by edition

20372038File dated 2026-09-11: connection date 2037-10-15Oct 2037File dated 2026-10-20: connection date 2037-09-15Sep 203711 Sep202620 Oct2026
20372038File dated 2026-09-11: connection date 2037-10-15Oct 2037File dated 2026-10-20: connection date 2037-09-15Sep 203711 Sep202620 Oct2026

Each step is a file that printed the connection date differently from the file before it. Year marks on the side are 1 January.

Observed changes

Showing changes in files dated from 23 Sep 2026.

  1. 20 Oct 2026. MW Effective From printed as 15 Sep 2037 (previous file: 15 Oct 2037), 30 days earlier. N84 holds no copy between 11 Sep 2026 and 20 Oct 2026; this change happened at some point in that time. -30 dayscalculated by N84 Wide comparison Correction after an older file was importedReceipt: NESO TEC Register, file dated 20 Oct 2026, row 409Receipt: NESO TEC Register, file dated 11 Sep 2026, row 400

Supported by National Energy SO Open Data

Data as published by the named source on the stated date. N84 may contain matching or processing errors. Not investment, legal or technical advice. The official register prevails.