Long-duration flexibility

Pumped storage

Pumped-storage hydro moves water uphill when electricity is plentiful and releases it through turbines when the grid needs power.

Pumped storage · installed / connected capacity2.90 GW

Operational pumped-storage power capacity at end-May 2026.

Energy capacity (MWh): not published in the source dataset

↯Pumped storage output

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Generated energy · 24h—

Generation only; pumping demand is not included

Mean output · 24h—

Average published generation output

Peak output · 24h—

Highest half-hourly reading

Live power flow

Pumped-storage generation

Half-hourly Elexon PS generation readings. Elexon caps negative pumping demand at zero in this fuel-type dataset, so pumping consumption is not shown here.

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30-day average

Typical hourly output

Average MW

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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 domain

Historic daily comparison

Last seven days

Net daily energy generated or absorbed while pumping.

Daily pumped-storage generation from Elexon PS FUELHH readings. Elexon caps negative pumping demand at zero, so these bars are generation-only rather than net storage energy. Today is accumulated so far.

Individual locations

Largest and selected sites

Installed power capacity and location from the latest official list.

4 shown

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