Ffestiniog Power Station Data

Output history

Reported availability

REMIT unavailability affecting this station over the last 12 months.

Unit lifecycle and sources

Effective-dated status is applied before station capacity and technology are calculated.

BM unit	Technology	Registered capacity	Current lifecycle
FFES-1	Pumped Storage	91 MW	Operating — dated evidence
FFES-2	Pumped Storage	92 MW	Operating — dated evidence
FFES-3	Pumped Storage	91 MW	Operating — dated evidence
FFES-4	Pumped Storage	91 MW	Operating — dated evidence

Sourced events

19 Sept 2026 · FFES-1
The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 91 MW registry reference remains separate.
Source date: 2026-09-19 · Reviewed: 2026-09-19
Primary source (opens in a new tab)
19 Sept 2026 · FFES-2
The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 91.9 MW registry reference remains separate.
Source date: 2026-09-19 · Reviewed: 2026-09-19
Primary source (opens in a new tab)
19 Sept 2026 · FFES-3, FFES-4
The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 90.9 MW registry reference remains separate.
Source date: 2026-09-19 · Reviewed: 2026-09-19
Primary source (opens in a new tab)

Physical capacity evidence

FFES-1 · 90 MW · evidenced from 2026-09-19

The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 91 MW registry reference remains separate.

Source 2026-09-19 · reviewed 2026-09-19

Operator capacity source

FFES-2 · 90 MW · evidenced from 2026-09-19

The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 91.9 MW registry reference remains separate.

Source 2026-09-19 · reviewed 2026-09-19

Operator capacity source

FFES-3 · 90 MW · evidenced from 2026-09-19

The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 90.9 MW registry reference remains separate.

Source 2026-09-19 · reviewed 2026-09-19

Operator capacity source

FFES-4 · 90 MW · evidenced from 2026-09-19

The current operator page identifies four generator-motor units and rates each as a 90 MW generator. The Power Station Dictionary maps exactly FFES-1 through FFES-4, so this is per-machine evidence rather than a divided 360 MW site total. The 90.9 MW registry reference remains separate.

Source 2026-09-19 · reviewed 2026-09-19

Operator capacity source

Whole-site registered total: 364.7 MW, including retired units.

Registered capacity is the value retained in the committed BM-unit source snapshot. “Not retained” means the registry no longer supplied a positive figure; it does not mean the unit historically had no capacity. If a unit with a retirement event publishes a non-zero live declaration, the live declaration keeps it in the operating fleet pending review.

About this asset

Ffestiniog is a operating pumped storage site in North Wales & Merseyside. It has 4 non-retired (0 unverified) and 0 retired mapped Balancing Mechanism units, with 360 MW on the displayed capacity basis.

Published site coordinate.

Current output is the operator’s declared Physical Notification. Metered output is published later and is shown as the solid portion of the history chart; outage shading comes from REMIT notices.