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Asset class

Grid Storage

OverWatts maps 965 grid storages across 58 countries. China holds the most — 401, 42% of the world total, ahead of United States (101). Operating capacity totals 206 GW. The largest is Yebatan Pumped Storage hydroelectric plant (4.5 GW).

The largest owner-operators worldwide are State Grid Xinyuan Co Ltd (55), Enel SpA (22) and Iberdrola SA (17). Half of the world's grid storages in service predate 1982 (median commissioning year of the 333 with a known date), 49 came online in the past decade and the oldest still listed is Venina hydroelectric plant, dating from 1923. 622 more are under construction or proposed, the biggest being Yebatan Pumped Storage hydroelectric plant (4.5 GW).

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965
Grid Storage
58
Countries
401
Most · China
206 GW
Operating capacity
622
In construction / proposed

Largest grid storages

Biggest owners & operators worldwide

Counts an asset once per company named as its owner or operator; a joint venture counts for each partner.

When they were built

Median commissioning year 1982 · 333 of 965 carry a start date

Largest under construction & proposed

Grid Storage by country

Frequently asked

How many grid storages are there in the world?
OverWatts maps 965 grid storages across 58 countries, from open datasets.
Which country has the most grid storages?
China, with 401 — 42% of the world total. Then United States (101) and India (86).
What is the largest grid storage in the world?
Yebatan Pumped Storage hydroelectric plant, at 4.5 GW.
Who owns the most grid storages?
State Grid Xinyuan Co Ltd is named as owner or operator on 55 of them, ahead of Enel SpA (22), Iberdrola SA (17) and Korea Hydro & Nuclear Power (KHNP) Co Ltd (14).
How much capacity do the world's grid storages have?
About 206 GW operating, with a further 683 GW under construction or proposed.