Coca Codo Sinclair Operating Below 50% of Rated Capacity — Equipment Degradation and River Erosion Constrain Output

Operational Status

Coca Codo Sinclair, Ecuador's flagship hydroelectric facility with a rated capacity of 1,500 MW, is currently generating below 50% of its design capacity, according to operational data reported by Que Noticias and confirmed by Celec EP disclosures.

The underperformance is structural rather than seasonal — while drought conditions reduce all hydroelectric output, Coca Codo's constraints persist even during periods of adequate water flow.

Root Causes

Equipment Degradation

The plant's water distributors — critical components that direct water flow to the turbines — contain more than 7,600 documented fissures according to the Comptroller General's 2018 inspection report. The cracks were identified in the steel linings of the distributors and have not been repaired despite the Comptroller's order requiring replacement before formal plant reception.

The fissures require Celec to operate affected units at reduced pressure and flow rates to prevent catastrophic failure, directly limiting power output per turbine.

Coca River Erosion

The Coca River — which feeds Coca Codo Sinclair's reservoir — has been experiencing progressive lateral erosion near the plant's water intake structures. The erosion is linked to the collapse of the San Rafael waterfall in February 2020, which altered the river's hydraulic dynamics upstream of the plant.

Key erosion impacts:

• Pipeline exposure — the SOTE and OCP crude oil pipelines, which cross the Coca River basin, have experienced multiple ruptures due to erosion since 2020
• Intake structure risk — progressive bank erosion threatens the stability of Coca Codo Sinclair's water capture infrastructure
• Sediment loading — increased sediment transport reduces reservoir capacity and accelerates turbine wear

Capacity Factor Analysis

Parameter	Design	Actual (2025)	Utilization
Rated capacity	1,500 MW	—	—
Average generation	~1,200 MW (80% CF)	~650-700 MW	~43-47%
Annual generation (GWh)	~8,700	~4,800-5,200	~55-60%
Availability factor	>95%	~70-75%	—

Grid Impact

Coca Codo Sinclair was designed to provide approximately 30% of Ecuador's total electricity generation. Its chronic underperformance has cascading effects:

• Increased reliance on Paute complex — Ecuador's second-largest hydro system (in Azuay province) bears disproportionate load
• Thermal backup activation — when hydro output falls short, expensive thermal generation (gas and diesel) fills the gap at significantly higher cost per MWh
• Blackout vulnerability — the 2024 rationing crisis was exacerbated by Coca Codo's inability to deliver rated output during the drought
• Export capacity eliminated — Ecuador was supposed to be a net electricity exporter; instead, it periodically imports from Colombia (now complicated by the bilateral trade dispute)

What to Watch

• April 17 formal reception — Celec will accept the plant and release ~$200M in guarantees to Sinohydro; after this, no contractual mechanism exists to compel equipment repairs
• Coca River erosion monitoring — IGEPN and Ministry of Energy reports on bank stability; any acceleration could threaten the intake structure
• Dry season generation data (July-November) — the real test of Coca Codo's limitations comes when water availability drops
• Celec operational investment — any capital expenditure program to address distributor fissures independently of Sinohydro would signal proactive risk management
• Energy import agreements — Ecuador's ability to purchase electricity from Peru (if available) as a backup to domestic hydro shortfalls

Sources: Que Noticias, Celec EP, Primicias