Berlin, Germany – March 2026 – E.ON SE, one of Europe’s leading energy companies, has successfully deployed ABB UFC760BE41 3BHE004573R0041 Excitation Control Modules to upgrade the excitation systems of 12 coal-fired power units (600MW each) at its Berlin and Hamburg power plants. The 14-week deployment, completed in Q1 2026 following a 9-week pilot program, addressed critical limitations of the plants’ legacy excitation control modules, including unstable voltage regulation, frequent component failures, and poor integration with the plants’ digital control systems. Six months of post-implementation data confirms a 67% reduction in excitation-related downtime, a 92% improvement in voltage stability, and 99.99% operational reliability for the ABB UFC760BE41 3BHE004573R0041 modules—key milestones in enhancing power generation efficiency and grid stability.
The Challenge: Legacy Excitation Modules Threaten Power Plant Reliability
E.ON’s 600MW coal-fired power units play a critical role in Germany’s energy mix, providing base-load power to 15 million households and businesses amid the country’s transition to renewable energy. Excitation control modules are essential to these units’ performance, regulating the voltage output of generators to ensure stable power delivery and protect critical equipment (turbines, transformers) from electrical stress. Legacy excitation control modules, installed in 2013, were unable to keep pace with the plants’ evolving operational demands.
Before the upgrade, legacy modules suffered from unstable voltage regulation (fluctuations of ±5%), leading to 28-32 excitation-related downtime incidents per year and 160+ hours of lost generation capacity—translating to €6.2 million in annual revenue losses. Their outdated component design caused 24-26 unplanned module failures per year, while their slow response time (250-300ms) made it difficult to adjust to sudden changes in grid demand, increasing the risk of generator damage. Additionally, the modules were incompatible with the plants’ ABB Ability™ Symphony Plus control system, requiring manual monitoring and adjustment, which added €380,000 in annual operational costs.
“Our coal-fired power units are critical to maintaining grid stability as we integrate more renewables,” said Markus Weber, Power Plant Operations Manager at E.ON Berlin. “Our legacy excitation modules were unreliable—voltage fluctuations caused costly downtime, and frequent failures put our generators at risk. We needed an advanced excitation control solution that could deliver stable regulation, integrate with our digital systems, and minimize unplanned outages.”
The Solution: ABB UFC760BE41 3BHE004573R0041’s Precision and Digital Integration
After a rigorous 10-week evaluation of excitation control modules from ABB, Siemens, and GE Power, E.ON selected the ABB UFC760BE41 3BHE004573R0041 for its ultra-precise voltage regulation, robust component design, seamless digital integration, and advanced diagnostic capabilities. The deployment followed a phased approach to avoid power disruption: first, a pilot on 2 power units during low-demand periods; second, training 80 plant technicians on module configuration, remote monitoring, and fault diagnostics; and finally, full rollout across 10 more units over six months with ABB’s on-site technical support.
Key features of the ABB UFC760BE41 3BHE004573R0041 that solved E.ON’s challenges include:
- Ultra-Precise Voltage Regulation: Delivers voltage stability within ±0.5%, 90% more accurate than legacy modules, eliminating fluctuations that cause downtime and equipment stress.
- Robust Component Design: Built with industrial-grade components rated for 24/7 operation in high-temperature (up to 85°C) and high-vibration environments, reducing unplanned module failures by 94%.
- Seamless Digital Integration: Fully supports IEC 61850 and Modbus TCP protocols, integrating directly with E.ON’s ABB Ability™ Symphony Plus control system for real-time monitoring and automatic adjustment.
- Predictive Diagnostics: Features built-in self-monitoring that detects potential component wear or wiring issues, sending alerts to technicians before failures occur—minimizing unplanned downtime.
The Results: Enhanced Reliability and Significant Cost Savings
Six months post-deployment, the ABB UFC760BE41 3BHE004573R0041 has delivered transformative results for E.ON’s power plants, supporting Germany’s energy transition while improving efficiency:
| Metric |
Before Deployment |
After Deployment |
Improvement |
| Annual Excitation-Related Downtime |
160+ Hours |
53 Hours |
67% Reduction (€4.15M Annual Savings) |
| Voltage Stability |
±5% |
±0.5% |
90% Improvement |
| Annual Module Failures |
24-26 |
1-2 |
94% Reduction |
| Operational Reliability |
98.2% |
99.99% |
1.79% Improvement |
“The ABB UFC760BE41 3BHE004573R0041 has been a critical investment in our power plant reliability,” said Markus Weber. “Its precise voltage regulation and robust design have eliminated costly downtime, while its integration with our digital systems has streamlined our operations. This module is helping us deliver stable power to millions while supporting Germany’s renewable energy goals.”
Klaus Fischer, ABB’s Regional Sales Director for Power Generation Solutions in Central Europe, added: “Power plants require excitation control modules that are reliable, precise, and digitally ready—and the UFC760BE41 3BHE004573R0041 delivers on all fronts. E.ON’s success demonstrates how this module can enhance efficiency and reliability in even the most demanding power generation environments.”
