Project Overview

The 1000kV Huainan-Nanjing-Shanghai Ultra-High Voltage (UHV) AC Power Transmission and Transformation Project is a key infrastructure development aimed at enhancing power supply reliability and efficiency in Eastern China. The project starts at the Huainan Substation in Anhui and extends to the Huxi Substation in Shanghai, utilizing double-circuit transmission towers to ensure stable and high-capacity electricity transfer.

Key Project Highlights
    •    Total Transmission Length: 759.414 km
    •    Transmission Capacity: 12,000,000 KVA
    •    Total Investment: RMB 26.8 billion
    •    Major River Crossings: Huaihe River, Changjiang (Yangtze) River
    •    New Ultra-High Voltage Substations: Nanjing, Taizhou, Suzhou (Jiangsu Province)
    •    Double-Circuit UHV Transmission Lines: 519.053 km across Huai’an, Taizhou, Yangzhou, Yancheng, Nantong, and Suzhou

This project plays a crucial role in optimizing China’s power grid, supporting clean energy integration, and securing a stable electricity supply for the Yangtze River Delta region.

Construction Plan & Execution

1. Route Planning & Geological Assessment

Given the complex geographical conditions, including urban landscapes, river crossings, and high-density industrial zones, our team conducted:
    •    Topographical and hydrological surveys to determine optimal tower locations.
    •    Seismic and wind load assessments to enhance structural stability.
    •    Environmental impact studies to minimize ecological disruption.

Advanced Geographic Information System (GIS) modeling was used to optimize the route and reduce land use conflicts.

2. Tower Construction & Structural Engineering

To accommodate double-circuit UHV AC transmission, the towers were designed with:
    •    Ultra-high-strength steel frameworks to withstand extreme weather conditions.
    •    Aerodynamic tower shapes to reduce wind and vibration effects.
    •    Corrosion-resistant coatings to ensure durability in coastal and high-humidity environments.

Tower foundations were constructed using:
    •    Deep-pile and rock-anchor foundations for stability in soft soil regions.
    •    Bored pile foundations in flood-prone areas.
    •    Steel-reinforced concrete bases for maximum load-bearing capacity.

Helicopter-assisted tower assembly was employed in challenging terrains to improve construction efficiency.

3. Conductor Installation & Stringing

The project features advanced high-performance conductors, designed for low-loss, high-efficiency power transmission. Key aspects include:
    •    Ultra-low resistance aluminum conductors for enhanced power flow.
    •    High-temperature-resistant composite insulators for long-term durability.
    •    Electromagnetic shielding measures to reduce interference in urban areas.

Precision tension stringing methods ensured conductor alignment, minimizing power loss and maintaining transmission efficiency.

4. Substation Construction & Grid Integration

Three ultra-high voltage substations (Nanjing, Taizhou, Suzhou) were built to regulate voltage levels and integrate the UHV AC line into the Eastern China power grid. These substations include:
    •    High-capacity transformers for stable voltage regulation.
    •    Reactive power compensation systems to manage grid fluctuations.
    •    Smart monitoring and automation to ensure real-time fault detection and fast response.

The project also ensures seamless integration with existing UHV DC transmission lines, enhancing grid stability and operational efficiency.

Design & Technical Services

1. Power System Analysis & Optimization

Our engineering team conducted:
    •    Load flow analysis to optimize power distribution.
    •    Electromagnetic field studies to mitigate interference in high-density urban areas.
    •    Voltage regulation simulations to ensure stable energy transfer.

2. Smart Grid & Automation

The project integrates state-of-the-art digital technologies, including:
    •    SCADA (Supervisory Control and Data Acquisition) systems for real-time monitoring.
    •    AI-driven predictive maintenance to detect potential failures before they occur.
    •    Automated relay protection to enhance system reliability.

3. Environmental & Safety Measures

To ensure sustainable development, we implemented:
    •    Noise reduction technologies in substations and transmission corridors.
    •    Bird flight diverters and ecological protection measures for wildlife conservation.
    •    High-voltage insulation shielding to reduce electromagnetic field emissions.

After-Sales Service & Maintenance

1. Routine Inspection & Preventive Maintenance

To guarantee long-term operational stability, we provide:
    •    Regular line and tower inspections using drones and infrared imaging.
    •    Transformer performance testing to prevent overheating and power losses.
    •    High-voltage conductor cleaning to remove pollution and improve efficiency.

2. Emergency Response & Grid Security

A dedicated 24/7 emergency response team is available to address:
    •    Weather-related disruptions (storms, lightning strikes, typhoons, etc.).
    •    Transmission faults due to conductor wear or mechanical stress.
    •    Cybersecurity threats and system anomalies.

3. Future Expansion & Upgrades

To meet growing energy demands, we offer:
    •    Capacity expansion solutions with upgraded transformers and conductors.
    •    Integration with renewable energy sources for a cleaner energy mix.
    •    Deployment of AI-powered grid management systems for enhanced efficiency.

4. Training & Technical Support

We provide:
    •    On-site and remote training programs for power grid operators.
    •    Workshops on advanced UHV substation operations and maintenance best practices.
    •    Continuous technical support through digital platforms and expert consultations.


The 1000kV Huainan-Nanjing-Shanghai UHV AC Power Transmission and Transformation Project is a groundbreaking initiative in China’s power grid modernization. By enabling efficient, high-capacity electricity transmission across key economic hubs, this project:
    •    Optimizes regional power distribution, reducing energy shortages.
    •    Enhances grid security and stability, preventing large-scale outages.
    •    Supports the transition to a cleaner, more sustainable energy system.

With cutting-edge engineering, smart grid technologies, and comprehensive maintenance services, we ensure the long-term success and reliability of this critical infrastructure.

For inquiries about UHV AC transmission solutions, grid engineering, or maintenance services, please contact us today!