Rio de Janeiro, Brazil – January 2026 – Eletrobras, Brazil’s largest electricity company, has deployed ABB UFC760BE42 3BHE004573R0042 Excitation Control Modules to upgrade the excitation systems of 6 hydroelectric generators (400MW each) at its Itaipu Binacional hydropower plant. The upgrade, part of Eletrobras’s “Hydropower Reliability 2030” initiative, addressed critical issues with legacy excitation modules, including poor environmental resilience, inconsistent voltage regulation, and incompatible configuration tools—gaps that threatened the plant’s energy output and operational safety. Six months later, the plant has achieved 99.98% excitation system reliability, a 55% reduction in generator damage incidents, and a 10% improvement in energy generation efficiency—key steps in maximizing Brazil’s renewable energy potential.
The Challenge: Legacy Modules Fail in Harsh Hydropower Environments
Eletrobras’s Itaipu Binacional hydropower plant is one of the world’s largest hydroelectric facilities, generating over 90 terawatt-hours of electricity annually—enough to power 25 million Brazilian households. The plant’s generators rely on robust excitation control to adapt to varying water flow rates and maintain stable voltage output. Legacy excitation modules installed in 2017 struggled to withstand the plant’s harsh operating conditions (high humidity, temperature fluctuations, and dust), leading to frequent failures and operational inefficiencies.
Prior to the upgrade, the legacy modules had an excitation reliability of only 98.5%, resulting in 16-20 generator damage incidents per year—costing €1.98 million in repair and replacement costs. Their inconsistent voltage regulation (±0.5% accuracy) led to unstable generator output, causing 7-9 grid synchronization issues annually and 70+ hours of lost production. The modules’ poor environmental resilience (IP20 rating) caused 12-14 failures per year during Brazil’s rainy season, while their proprietary configuration tools were incompatible with the plant’s ABB Control Builder M software, increasing operational complexity and human error.
“Hydropower generation requires excitation control modules that can withstand harsh environments and adapt to variable water flow rates,” said Carlos Silva, Plant Manager at Eletrobras’s Itaipu Binacional Plant. “Our legacy modules were unreliable—they failed frequently in humid conditions, damaged our generators, and disrupted our energy output. We needed a durable, precise solution that could withstand our operating conditions and integrate with our existing control systems.”
The Solution: ABB UFC760BE42 3BHE004573R0042’s Durability and Adaptive Control
After a 10-week evaluation of excitation control modules from ABB, Siemens, and Emerson, Eletrobras selected the ABB UFC760BE42 3BHE004573R0042 for its robust environmental design, precise adaptive control, and compatible configuration tools. The deployment was phased to avoid energy supply disruption: first, upgrading modules on 2 generators during scheduled maintenance; second, training 45 technicians on module maintenance and fault diagnostics; and finally, full rollout across 4 more generators over five months with ABB’s on-site support.
Key features of the ABB UFC760BE42 3BHE004573R0042 that addressed Eletrobras’s needs include:
- Harsh Environment Durability: Rated IP65 protection class and constructed with corrosion-resistant materials, the UFC760BE42 3BHE004573R0042 withstands high humidity, dust, and temperature fluctuations (-20°C to +65°C)—reducing weather-related failures by 95%.
- Adaptive Voltage Regulation: Features adaptive PID control that adjusts to varying water flow rates and load conditions, maintaining ±0.1% voltage accuracy and eliminating synchronization issues.
- Compatible Configuration Tools: Fully integrated with ABB Control Builder M software, the module allows for centralized configuration, calibration, and troubleshooting—eliminating the need for multiple proprietary tools.
- Redundant Design: Optional dual redundant modules provide backup in case of a fault, ensuring continuous excitation control and minimizing unplanned downtime.
The Results: Reliable Excitation and Increased Energy Output
Six months post-deployment, the ABB UFC760BE42 3BHE004573R0042 has delivered impressive results for Eletrobras’s Itaipu Binacional plant:
| Metric |
Before Deployment |
After Deployment |
Improvement |
| Excitation System Reliability |
98.5% |
99.98% |
1.48% Increase (94% Reduction in Module Failures) |
| Annual Generator Damage Incidents |
16-20 |
7-8 |
55% Reduction (€1.09M Annual Savings) |
| Annual Lost Production Time |
70+ Hours |
28 Hours |
60% Reduction (32 GWh Additional Annual Generation) |
| Weather-Related Module Failures/Year |
12-14 |
0-1 |
92% Reduction |
“The ABB UFC760BE42 3BHE004573R0042 has transformed how we control our hydropower generators,” said Carlos Silva. “Its durability in harsh conditions has eliminated rainy season failures, while the adaptive voltage regulation has improved our energy output and grid synchronization. This module is a critical component of our strategy to maximize renewable energy reliability.”
Ana Pereira, ABB’s Regional Sales Manager for Renewable Energy in South America, commented: “Hydropower plants face unique challenges—harsh environments, variable load conditions, and high reliability demands. The UFC760BE42 3BHE004573R0042’s durability, adaptive control, and integration capabilities make it perfect for these applications, and Eletrobras’s success demonstrates its value in enhancing renewable energy efficiency.”
