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