CEA Flags Systemic Insulator Failures, Recommends Urgent Reforms For Grid Reliability—Report

In May 2026, the Central Electricity Authority (CEA) released a detailed report highlighting the growing problem of insulator failures across India’s high-voltage transmission network. Insulators play a very important role in the power system as they provide electrical isolation and mechanical support to transmission lines. However, recent data shows that their failure is becoming a major reason for power outages, raising concerns about grid reliability.

The issue became more serious after several incidents in 2025, especially in the Mumbai Metropolitan Region, where multiple outages were linked to the failure of polymer insulators. A Technical Committee was set up to study these events in detail. The findings showed that these failures were not isolated cases but part of a larger systemic problem. The report also highlighted that weather plays a major role, with around 60% to 80% of failures happening during the monsoon season.

The committee identified different causes of failure depending on the type of insulator used. Composite or polymer insulators, which are widely used today due to their lighter weight and better performance in polluted conditions, have their own challenges. These insulators are about 60% lighter than traditional porcelain ones, but they are prone to issues such as brittle fractures, loss of water-repelling properties, and damage to the core due to moisture entering inside. Improper fixing of end fittings, known as crimping, was also found to be a common reason for failure.

On the other hand, porcelain insulators, which have been used for more than 30 years, are known for their durability. However, they attract water easily, which makes them more vulnerable in polluted and coastal areas. This can lead to flashovers unless they are treated with protective coatings like RTV silicone.

The report also pointed out several operational gaps. These include poor control of electric fields, improper storage and handling of insulators, and a lack of consistent maintenance practices across utilities. Such issues further increase the chances of failure.

To address these challenges, the CEA has recommended several technical improvements. For composite insulators, it is suggested to increase the thickness of the outer covering and improve the heat resistance of the core material to prevent damage under high temperatures. It has also made it mandatory to use grading and corona rings for transmission lines of 220 kV and above. These devices help in better distribution of voltage and reduce the risk of overheating.

In addition, the report calls for advanced testing methods to ensure the quality and lifespan of insulators. Tests like the Power Arc Test and Water Diffusion Test will help verify whether the insulators can last for the expected 25 years.

The report strongly emphasizes the need to shift from reactive maintenance to a condition-based monitoring system. This includes regular pre-monsoon inspections using thermal imaging and drone-based UV cameras to detect early signs of damage. It also recommends a standardized reporting system to create a national database of failures. For better tracking, each insulator should have a QR code or RFID tag to record its manufacturing and service details.

By implementing these measures by the end of 2026, the Ministry of Power aims to reduce outages, improve maintenance efficiency, and strengthen the reliability of India’s power grid.