The Apex of Pumped Storage

The Fengning Pumped Storage Power Plant in Hebei Province is a record-breaking achievement. With a total capacity of 3,600 MW (3.6 GW), it officially surpassed Virginia’s Bath County station to become the largest in the world. At Hydro News, we analyze why Fengning is the global benchmark for large-scale energy storage.

1. Technical Specifications: The Power of 12

What makes Fengning unique is not just its total power, but the number of units.

• Total Capacity: 3,600 MW.
• Number of Units: 12 reversible pump-turbine units (300 MW each).
• Construction Timeline: Phase I started in 2013, Phase II in 2015. The plant became fully operational by the end of 2024 (fully connected for the 2022 Winter Olympics backup).
• Annual Generation: Expected to produce 6.61 billion kWh annually while consuming 8.71 billion kWh for pumping.

2. Cutting-Edge Equipment: Variable Speed Technology

Two of the 12 units at Fengning are equipped with variable-speed motor-generators. This is a critical commercial advantage.

• Frequency Control: Unlike fixed-speed units, variable-speed technology allows the plant to adjust its power consumption while pumping. Consequently, it provides superior stability to the grid when integrating volatile wind and solar power.
• Suppliers: The project utilized high-end technology from domestic giants like Harbin Electric Machinery and international expertise in control systems.

3. Civil Engineering Marvels

The scale of Fengning’s reservoirs is staggering.

• Upper Reservoir: Located at an altitude of 1,500 meters, carved into the mountains.
• Lower Reservoir: Situated in the valley, providing a massive water volume for 10.8 hours of continuous full-power operation.
• Storage Capacity: The station can store up to 40 million kWh of energy—enough to power 1.5 million homes for a full day.

4. The Business Lesson: Grid Stability as a Product

Fengning was built to solve the «Duck Curve» for the Beijing-Tianjin-North China grid. Clearly, its primary product is not just electricity, but reliability.

• Carbon Neutrality: By balancing renewable energy, Fengning offsets 480,000 tons of coal consumption and 1.2 million tons of CO2 emissions every year.
• Commercial Strategy: China uses such plants to enable the massive growth of wind and solar farms, ensuring that «green» energy never goes to waste.

Conclusion: The Future of Scaling

Fengning proves that «scaling to the max» is the only way to support a modern, carbon-neutral economy. Ultimately, the lessons learned here—especially regarding variable-speed units—are the roadmap for future PSH projects in the Middle East and beyond.