Coca Codo Sinclair Inaugurates $19M Permeable Dam to Halt Regressive Erosion at Intake Works
Project Overview
Minister of Environment and Energy Inés Manzano inaugurated a USD 19 million permeable dam on April 13, 2026 at Ecuador's flagship Coca Codo Sinclair hydroelectric facility (1,500 MW installed capacity), addressing the regressive erosion phenomenon that has progressively threatened the plant's intake works since the February 2020 collapse of the San Rafael waterfall (source).
Engineering Specification
| Parameter | Value |
|---|---|
| Plant installed capacity | 1,500 MW |
| Dam cost | USD 19 million |
| Dam location | 7.8 km upstream from intake works |
| Dam type | Permeable dike |
| Engineering function | Velocity dissipation during high-flow periods |
| Bidding launch | November 2023 |
| Inauguration | April 13, 2026 |
In Manzano's verbatim words: "el dique cumplirá la función de disipar la fuerza del río" — the dike will dissipate river force.
Erosion Status
The regressive erosion phenomenon — characterized by upstream advancement of riverbed degradation that destabilizes hydraulic structures — has been the central operational risk to Coca Codo Sinclair since 2020:
- 2020 baseline — erosion front 19.2 km from intake works (post-San Rafael collapse)
- Current position — 3.6 km from intake (as of April 8, 2026)
- Stationarity — front has held at 3.6 km for 246 days, suggesting partial geological stabilization
- New dike position — 7.8 km, providing a 4.2 km engineering buffer if the front reactivates
Hydrological Context
Coca Codo Sinclair's generation capacity is directly tied to river flow:
| Flow (m³/s) | Generation Output |
|---|---|
| 200 | 1,000–1,200 MW |
| ~225 (current April 2026) | Above minimum threshold |
The April–September peak flow season is now active. Water flow above 200 m³/s allows substantial generation, but velocity also increases erosion risk — hence the timing of the dam inauguration.
Operational and Fiscal Significance
Coca Codo Sinclair is central to Ecuador's electricity matrix and to the Sinohydro construction guarantee dispute that remains unresolved (see Brief #247, Sinohydro April 17 reception demand). The plant has historically operated below 50% of rated capacity due to combined equipment degradation and erosion constraints (Brief #251). The new permeable dam addresses one variable in a multi-factor underperformance equation.
What to Watch
- Erosion front response — whether the 3.6 km position remains stationary through the April-September peak flow season
- Generation impact — Q2-Q3 2026 generation data will indicate whether dam-protected operations enable higher sustained output
- Sinohydro dispute — the April 17 reception deadline and $200M in guarantees remain unresolved (Brief #247)
- Capacity factor reporting — CELEC EP quarterly reports on plant utilization
- Capital allocation — whether the Ministry commits additional funding for downstream erosion mitigation or further dam construction
Source: Primicias
Source
Primicias — “Coca Codo Sinclair: nuevo dique permeable busca frenar la erosión regresiva”
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