Pumped storage output
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Pumped storage generation
Pumped storage · installed / connected capacity2.90 GW
Operational pumped-storage power capacity at end-May 2026.
Energy capacity (MWh): not published in the source datasetEstimated from half-hourly readings
Average transmission output
Highest half-hourly reading
Live power flow
Pumped-storage flow
Half-hourly Elexon PS readings. Positive values generate to the grid; negative values indicate pumping.
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30-day average
Typical hourly output
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Combining the latest 30 days of half-hourly readings.
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Location map
Selected operating sites
Dots show the largest or most representative projects in the published dataset.
4selected locations shown
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Coastline: Natural Earth · public domainHistoric daily comparison
Last seven days
Net daily energy generated or absorbed while pumping.
Net daily energy from Elexon PS readings; positive values are generation and negative values mean more energy was used pumping than generated. Today is accumulated so far.
Individual locations
Largest and selected sites
Installed power capacity and location from the latest official list.
SiteTypeRegionPower
DinorwigPumped hydroWales1,728 MW
CruachanPumped hydroScotland440 MW
FfestiniogPumped hydroWales360 MW
FoyersPumped hydroScotland300 MW
Capacity & sitesDESNZ DUKES 5.11
Snapshot dateEnd-May 2026
Live & historyElexon FUELINST / FUELHH