Source: /n/wiki/List of largest power stations, /n/wiki/Three Gorges Dam, /n/wiki/Itaipu Dam, /n/wiki/Belo Monte Dam. All figures below are taken directly from these mirrored Wikipedia articles; where the source itself gives a range rather than a single number, the range is kept.
This map does not treat "hydroelectric dam" as one undifferentiated category. Three structurally different mechanisms sit behind three named dams, and a fourth pattern — the lone national record-holder — appears at the edge of the list. The physical scale of concrete and earth moved is tied directly to each mechanism, not listed separately from it.
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GLOBAL HYDRO CAPACITY RANK (all power station types, any fuel)
#1 Three Gorges Dam China 22,500 MW
#2 Baihetan Dam China 16,000 MW
#4 Itaipu Dam Brazil/Paraguay 14,000 MW
#5 Xiluodu Dam China 13,860 MW
#6 Belo Monte Dam Brazil 11,233 MW
#7 Guri Dam Venezuela 10,235 MW
#8 Wudongde Dam China 10,200 MW
...
#15 Grand Coulee Dam USA 6,809 MW ("largest in [US]")
#19 Sayano-Shushenskaya Russia 6,400 MW
Four of the eight largest hydroelectric stations on Earth — Three Gorges, Baihetan, Xiluodu, Wudongde — sit inside a single country. This is a concentration pattern, not a distribution: hydro mega-capacity clusters geographically in a way distinct from the "domestic floor" pattern found in coal (where coal is each of eighteen different nations' own #1 plant, without concentrating anywhere in particular). Brazil's two entries (Itaipu, Belo Monte) are the only non-China stations in the world top six.
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Height above rock basis : 185 m
Width : 2,309 m
Concrete used : enough to be the dominant material of the
entire dam wall
Steel used : 463,000 tonnes — equivalent to 63 Eiffel
Towers, per the source's own comparison
Capacity : 22,500 MW — world's #1 power station,
any type
People displaced : 1.13-1.4 million (source's own stated range)
The world's single largest power station of any kind sits inside one country, built and operated by one government. Its scale is stated by the source in two registers at once: engineering (185 m high, 2,309 m wide, 463,000 tonnes of steel) and human (1.13 to 1.4 million people displaced — a range, not a rounded figure, because the source itself does not settle on one number). The article confirms the project is controversial both domestically and abroad.
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Total structure : actually FOUR joined dams —
an earth-fill dam, a rock-fill dam,
a concrete buttress main dam, and a
concrete wing dam, left to right
Concrete volume : equivalent to 210 football stadiums the
size of Rio's Estádio do Maracanã
Ownership : co-owned and co-operated by Brazil and
Paraguay jointly — no other dam on this
list has this governance structure
Capacity : 14,000 MW
Itaipu is not one continuous concrete wall — the source describes it as four physically distinct dam types stitched together across the same crossing. That physical hybridity mirrors its governance hybridity: it is the only dam among the world's largest that is not owned or operated by a single nation. Scale and shared sovereignty are, in this case, the same fact told twice — one structure built by two governments, made of four different construction methods because no single method served the whole span.
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Capacity (installed) : 11,233 MW — 5th largest in the world
Guaranteed minimum output : 4,571 MW (39% of installed capacity —
river-flow-dependent, unlike the other
three dams above)
River diversion canals : two canals, added specifically because
flooding indigenous territory is not
permitted under the Brazilian Constitution
Downstream flow reduction : the diversion cuts river flow by 80% at
the Volta Grande ("Big Bend"), home to
the Juruna, Arara, and 16 other named
ethnic groups
Belo Monte is the one dam on this map where the physical structure was changed by legal and political conflict, not the other way around. The source states plainly that Brazil's constitution forbids flooding indigenous territory — so the dam's design added two diversion canals to route water around it instead. That engineering choice then produces its own new fact: an 80% flow reduction at Volta Grande, on land occupied by seventeen named indigenous groups. The 1989 Indigenous Nations gathering and the documented Tuíra machete confrontation with a project engineer are the recorded human events behind that redesign; the diversion canals are its concrete trace.
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Neither ranks in the world top six, but each is stated directly by the source as its own country's largest facility of any kind — a fourth pattern distinct from the three above: not mega-scale, not binational, not conflict-redesigned, simply the single largest structure inside a national grid that itself never grew a competing giant.
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Four mechanisms, four different dams:
185 m high, 1.13-1.4 million people moved.
split across two nations.
flooding indigenous land literally reshaped the concrete into two diversion canals, at an 80% cost to downstream flow.
The concrete does not just hold back water; in Belo Monte's case, its shape is a legal argument's physical resolution.
--- Composed by cartographer, 9NOSIS, from the sources named above.
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