Reservoir Watch
Storage levels across 24 hydropower reservoirs in the national grid. Colombia runs on hydropower, so its operator reports reservoir storage as energy (GWh) rather than water volume.
Average fill
79.2%
Energy stored
13.8 TWh
Reservoirs
24
Critical
1
Low level
1
Storage is measured as energy. Colombia's grid operator XM publishes reservoir levels as useful energy (GWh) — the electricity each reservoir could still generate — not as water volume (hm³). Fill % is useful energy ÷ useful capacity, directly comparable to other countries; the absolute figures are GWh, not cubic hectometres.
Colombia at a glance
National average fill
79.2%
13,846 of 17,483 GWh stored
Reservoirs
24
Departments
10
Total capacity
17.5 TWh
Energy stored
13.8 TWh
Critical
1
Low level
1
Coverage: XM — Operador del Mercado de Energía (wholesale electricity market). Tracks the reservoirs that feed Colombia's interconnected hydropower system. Last reading: 2026-09-09.
National fill — multi-year
By department
Sorted by capacityCundinamarca
4 reservoirs
Average fill
79.1%
Antioquia
10 reservoirs
Average fill
80.3%
Huila
2 reservoirs
Average fill
78.9%
Santander
1 reservoir
Average fill
75.2%
Boyacá
1 reservoir
Average fill
96.4%
Cauca
1 reservoir
Average fill
72.5%
Valle del Cauca
2 reservoirs
Average fill
60.5%
Caldas
1 reservoir
Average fill
65.5%
Córdoba
1 reservoir
Average fill
71.2%
Tolima
1 reservoir
Average fill
36.7%
By department
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All reservoirs
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Dataset coverage
Tracked
24
reservoirs
With data
24
reservoirs
Tracked capacity
17,483
GWh
Source: XM — Operador del Mercado de Energía (Sinergox / servapibi)
Covers the hydropower reservoirs that feed Colombia’s national interconnected system (SIN). Storage is reported as useful energy (GWh).
About reservoirs in Colombia
As of September 9, 2026, the reservoirs we track across Colombia that report live levels hold roughly 13,846 GWh of water — about 79.2% of their combined capacity. Taken together, Colombia's reservoirs are within their normal operating range.
Across the region, 1 reservoir is at critically low levels and 1 is low. Playas is the fullest at 105.0%, while Alto Anchicayá is the lowest at 4.2%.
Over the most recent week on record, 7 reservoirs rose and 11 reservoirs fell across Colombia.
Storage figures for Colombia come from XM; the most recent reading is from September 9, 2026. Each reservoir below links to its own page with full history and seasonal context.
Colombia at a glance
- Reservoirs tracked
- 24
- Average fill
- 79.2%
- Water stored
- 13,846 GWh
- Combined capacity
- 17,483 GWh
- At critically low levels
- 1
- Fullest
- Playas (105.0%)
- Lowest
- Alto Anchicayá (4.2%)
- Last updated
- September 9, 2026