Foreword

Amid the grand narrative of carbon peaking and carbon neutrality goals, high-voltage (HV) and extra-high-voltage (EHV) cables are no longer mere power transmission mediums; they are the "blood vessels" and "nerves" of the new power system. In 2026, with the gradual rollout of the State Grid's ¥4 to ¥4.5 trillion investment plan for the 15th Five-Year Plan period, China's HV cable industry is undergoing a profound transformation from "quantity" to "quality."

This article synthesizes the latest industry developments to provide a deep dive into three core dimensions driving change: green new materials, smart manufacturing processes, and the competitive landscape of the high-end market.

1. The Green Breakthrough: From "Functional" to "Low-Carbon," Eco-Friendly Insulation Leads the Trend

Traditionally, cross-linked polyethylene (XLPE) has been the go-to insulation for HV cables. While stable, it falls short in recyclability and carbon footprint. Today, "Green Transformation"​ has become the industry's primary strategy for differentiation.

A. The Rise of Thermoplastic Polypropylene (PP)

Recently, led by the China Electric Power Research Institute (CEPRI) in collaboration with industry leaders like Orient Cable and Wanma Hi-Tech, a breakthrough was achieved in 220kV high-voltage AC thermoplastic polypropylene cable systems. This marks a critical milestone in eco-friendly cable technology.

• Core Advantages:​ Compared to traditional materials, PP cables not only offer excellent electrical properties but also achieve a 70% reduction in production cycles and a 45% decrease in energy consumption.​ Furthermore, they reduce carbon dioxide equivalent emissions by approximately 5 tons per kilometer. This "recyclable" attribute aligns perfectly with the urgent demand for "low-carbon/zero-carbon" equipment in the new power system.

B. The Localization of High-End Insulation Materials

For a long time, insulation materials (XLPE) for 110kV and above were heavily reliant on imports, constraining industrial security. Encouragingly, material giants like Yanshan Petrochemical have broken this monopoly by establishing China's first continuous, fully enclosed ultra-clean XLPE insulation material production facility. This extreme focus on raw material purity—such as dedicated tanker truck delivery to prevent secondary contamination—ensures the high reliability of high voltage cable at the source, effectively resolving the "bottleneck" issue.

2. Smart Manufacturing: Solving the "Eccentricity" Problem with Vertical Production

The quality of HV cables often hinges on micron-level precision. As the industry pursues ultimate performance, traditional horizontal production lines are struggling to meet stringent EHV standards, making "Vertical Production"​ the new industry standard.

A. VCV Towers: The Art of Centering

In new projects by companies like Zhongchen Cable, the VCV (Vertical Continuous Vulcanization)​ towers, standing up to 149.9 meters tall, are the most prominent features.

• Why "Stand" to Produce?​ EHV cable insulation layers can be dozens of millimeters thick. During horizontal extrusion, molten material tends to sag due to gravity, leading to insulation "eccentricity."​ Uneven thickness causes electric field concentration at weak points, potentially triggering premature aging or breakdown. By utilizing vertical integration within these towers, manufacturers effectively eliminate gravitational interference, ensuring perfect concentricity and uniform cross-linking. This significantly extends the service life of cables in extreme environments like nuclear power plants and offshore wind farms.

B. Full-Process Digital Quality Control

Beyond hardware upgrades, intelligent inspection methods are evolving. Modern production lines are equipped with multi-layer filtration, magnetic separators, and metal detectors acting as "security checkpoints" to intercept micro-impurities. Combined with an Optical Contamination System (OCS) and a "one-vote veto" mechanism, HV cable production is shifting from "experience-based manufacturing" to "data-driven smart manufacturing."

3. Market Dynamics: Advancing into the "Deep Sea" and "Far Horizons" Amidst Intensifying Head Effects

As technical barriers rise, the "Matthew Effect" in the HV cable market is becoming more pronounced, with resources concentrating among top players possessing core technologies.

A. UHV and Submarine Cables: Two Golden Tracks

• Ultra-High Voltage (UHV):​ As the "main arteries" of inter-regional energy distribution, UHV construction is directly fueling demand for EHV cables. With an estimated 3–4 UHV DC lines approved annually during the 15th Five-Year Plan, the relevant cable market is projected to reach ¥80–90 billion, with a localization rate exceeding 70%.

• Offshore Wind Power Cables:​ The development of deep-sea wind farms has created massive demand for 500kV three-core submarine cables. These products require extreme manufacturing capabilities—long lengths, joint-free designs, and high-pressure resistance. Current capacity utilization remains extremely high, making this the most profitable "second growth curve" for enterprises.

B. Competitive Landscape Stratification

A clear tier structure has formed:

• Tier 1 (Oligopoly):​ Leading enterprises such as Hengtong Optic-Electric, Zhongtian Technology, Orient Cable, and Baosheng Science & Technology dominate the majority of the market share. They compete on technological prowess and scenario adaptability rather than price.

• Survival Rules for SMEs:​ Small and medium-sized enterprises lacking technical depth face increasing pressure to exit the market. Their survival depends on focusing on niche markets—such as heat-resistant cables or radiation-resistant cleanroom cables for semiconductors—to avoid the quagmire of homogeneous price wars.

Conclusion

In 2026, China's high-voltage cable industry stands at a window of concentrated technological dividends. From breakthroughs in high-end insulation materials to the towering VCV structures along the coast, Chinese cable manufacturers are redefining the global competitive landscape through a combination of "New Materials + New Processes + New Standards."​ For industry professionals, keeping pace with green and smart trends while capitalizing on opportunities in UHV and deep-sea wind power will be the key to future success.