Coca Codo Sinclair's 1,500 MW at Risk — Erosion Could Reach Intake by 2026

The Threat

Coca Codo Sinclair, Ecuador's largest hydroelectric facility at 1,500 MW of installed capacity, faces a slow-moving infrastructure crisis that could compromise approximately 30% of the country's electricity generation. The U.S. Army Corps of Engineers has assessed that progressive riverbed erosion along the Coca River may reach the plant's water intake structures by 2026 — a timeline that has forced emergency mitigation spending and contingency planning.

The erosion originates from the February 2020 collapse of San Rafael Waterfall, Ecuador's tallest waterfall at 150 meters, located approximately 20 kilometers downstream from the plant. The waterfall's disappearance destabilized the river's erosion base level, triggering a regressive erosion process that has been migrating upstream toward the plant at a rate of approximately 1-2 kilometers per year.

Plant Significance

Metric	Value
Installed capacity	1,500 MW
Share of national generation	~30%
Construction cost	$2.245 billion
Commissioning	November 2016
Contractor	Sinohydro (China)
Financing	China Exim Bank
Location	Napo province, eastern Andes

Coca Codo Sinclair was the flagship project of Ecuador's $7 billion hydroelectric investment program under the Correa administration. Financed by China Exim Bank and built by Sinohydro, the plant was intended to transform Ecuador from a net electricity importer to a regional exporter. It remains the single largest piece of generation infrastructure in the national grid.

Erosion Timeline

Date	Event
February 2020	San Rafael Waterfall collapses
2020-2022	Erosion migrates upstream at ~1-2 km/year
2023	US Army Corps of Engineers conducts assessment
2024	Erosion reaches secondary infrastructure zones
2025	$17.3M mitigation program begins
2026 (projected)	Erosion may reach primary water intake

Mitigation Measures

The Ecuadorian government has allocated $17.3 million in emergency mitigation, which includes:

• Permeable dam construction — engineered structures designed to slow erosion velocity and capture sediment before it reaches critical infrastructure
• Steel-mesh bank reinforcement — gabion-style protection along the most vulnerable riverbank sections near the intake
• Monitoring systems — real-time sensors tracking erosion advancement rates and structural integrity of intake infrastructure

International engineering consultants, including the US Army Corps of Engineers, have cautioned that these measures may delay but not prevent erosion from eventually compromising the intake. A permanent solution would likely require rerouting the water intake upstream at a cost of several hundred million dollars — a project that would take years to design and construct.

Contingency Generation

Anticipating potential Coca Codo Sinclair output reductions, Ecuador has secured three leased Turkish floating power plants (powerships) from Karpowership, a Turkish firm that operates a global fleet of ship-based natural gas and fuel oil generation:

Vessel	Capacity	Fuel	Location
Powership 1	~200 MW	Fuel oil	Guayaquil
Powership 2	~200 MW	Fuel oil	Esmeraldas
Powership 3	~200 MW	Fuel oil	TBD

These floating plants provide approximately 600 MW of emergency backup capacity — enough to partially offset a Coca Codo Sinclair reduction but far short of replacing the full 1,500 MW. The powership leases represent a significant ongoing fiscal cost, estimated at $150-200 million annually.

Broader Energy Implications

Coca Codo Sinclair's vulnerability compounds an already strained energy situation:

• Ecuador experienced nationwide blackouts in late 2024 due to drought-reduced reservoir levels across the hydroelectric fleet
• The country's over-reliance on hydroelectric generation (approximately 75-80% of total electricity) creates acute vulnerability to both hydrological and infrastructure risks
• Transmission infrastructure connecting the plant to demand centers in Quito and Guayaquil was designed assuming continuous 1,500 MW output; reduced generation would strain alternative routing

The plant also carries significant geopolitical weight — it is the largest Chinese-financed infrastructure project in Ecuador, and any failure would become a reference point in debates over Chinese construction quality in Latin America. Sinohydro has faced criticism over reported construction defects including thousands of cracks in steel-lined water tunnels, though the company disputes these characterizations.

What to Watch

• 2026 erosion monitoring data — real-time measurements will determine whether the erosion front reaches the intake on the Corps' projected timeline
• Emergency intake reroute decision — whether the government commits to a permanent upstream intake relocation, and at what cost
• Powership lease renewals — the duration and cost of continued floating generation contracts as a hedge against hydroelectric risk
• Rainy season impact — higher river flows during April-July could accelerate erosion beyond current projections
• Insurance and liability claims — whether Ecuador pursues claims against Sinohydro for any design deficiencies that failed to account for geological risk

Sources: Rio Times Online, US Army Corps of Engineers