Hydrology and El Niño
Colombia generates most of its power from water. When El Niño dries the rivers, reservoirs fall and thermal plants set a higher price.
- Reservoir level
- 77.0%+0.9 points vs 7 days earlieron Oct 27, 2026
- River inflows
- 69%170.6 GWh/day against the historical mean for the day (100 % is normal)on Oct 27, 2026
- El Niño index (ONI)
- 2.16Strong El Niño3-month season centred on Aug 2026
- Spot price
- 421COP/kWh−67 COP/kWh vs 7 days earlieron Oct 25, 2026
Read the panels from top to bottom: less rain lowers inflows, reservoirs follow, and the price rises when thermal plants must fill the gap.
Reservoir level
Useful volume as a share of capacity
Reservoir level: from 72 % on Oct 28, 2023 to 77 % on Oct 27, 2026. Low 29 % on Apr 18, 2024; high 86 % on Nov 19, 2025.
River inflows
Energy inflows compared with the historical mean for each day
- 7-day average
- Historical mean
River inflows: from 169 GWh/day on Oct 28, 2023 to 162 GWh/day on Oct 27, 2026. Low 58 GWh/day on Jan 30, 2024; high 506 GWh/day on May 23, 2025.
El Niño index (ONI)
Positive values (red) are El Niño, negative (blue) La Niña
- El Niño
- La Niña
El Niño index (ONI): from 1.74 on Oct 28, 2023 to 2.16 on Aug 31, 2026. Low -0.61 on Nov 1, 2025; high 2.16 on Aug 1, 2026.
Spot price
Daily mean, same time axis
Spot price: from 493 COP/kWh on Oct 28, 2023 to 421 COP/kWh on Oct 25, 2026. Low 103 COP/kWh on Oct 26, 2025; high 2,499 COP/kWh on Sep 30, 2024.
Generation mix over time
Monthly share of generation by source
- Thermal
- Hydro
- Wind
- Solar
- Cogeneration
- Other