Air Insulated Ring Main Unit Market Size, Share & Industry Analysis, By Installation Type (Indoor RMU and Outdoor RMU), By Voltage Rating (Up to 15 kV, 15-25 kV, and Above 25 kV), By Application (Distribution Utilities, Renewable Energy Systems, Industrial Power Distribution, Infrastructure Projects, and Commercial Buildings), and Regional Forecast, 2026-2034

The global air insulated ring main unit market is witnessing moderate growth, with a value of USD 2.22 billion in 2025. The market is projected to grow to USD 3.65 billion by 2034, exhibiting a CAGR of 5.45% during the forecast period (2026-2034). The market for air insulated ring main units (RMUs) is expanding as power distribution networks worldwide continue to develop and improve. Governments and utilities are making significant investments to modernize aging electrical infrastructure and build reliable medium-voltage distribution systems to meet growing power demand. Due to their safe, reliable, and cost-effective switching and protection solutions, air insulated RMUs are commonly used in industrial facilities, substations, and metropolitan power distribution networks.

In August 2024, EcoRMU announced its new SF₆-free air insulated ring main unit from Schneider Electric, which aims to reduce the environmental impact of medium-voltage power distribution systems. The solution uses clean-air insulation technology rather than SF6 gas and is designed for utilities and urban distribution networks seeking to comply with more stringent environmental regulations.

Impact of AI on the Air Insulated Ring Main Unit Market

The Air Insulated Ring Main Unit (RMU) sector is being significantly impacted by Artificial Intelligence (AI), which is improving the efficiency, reliability, and management of electricity distribution networks. Utilities may use AI-powered monitoring systems and smart grid technology to proactively maintain medium-voltage networks, where RMUs are widely used to identify potential faults and optimize load allocation. By analyzing real-time operational data from grid infrastructure and sensors, AI can pinpoint anomalies and prevent unanticipated power outages, thereby lowering maintenance expenses and enhancing system reliability.

• According to the International Energy Agency, global energy organizations emphasize the growing importance of smart grids and digital grid technologies, which require significant investment to upgrade electricity distribution networks. The International Energy Agency (IEA), for instance, predicts that by 2030, investments in the electricity grid will total roughly USD 633 billion, with a large share going toward digital technologies and smart grid infrastructure that use AI-based monitoring and automation systems.

Air Insulated Ring Main Unit Market Driver

Expansion of Power Distribution Infrastructure to Drive Market Growth

The growth of the air insulated ring main unit (RMU) market is largely attributable to the development of electricity distribution infrastructure. To address rising electricity demand, governments and utilities worldwide are investing heavily to upgrade aging electrical networks and expand medium-voltage distribution infrastructure. As air insulated RMUs provide reliable switching, protection, and fault isolation in medium-voltage power systems, they are frequently used in distribution substations, urban power grids, and industrial facilities.

• In June 2025, Stonepeak, a company specializing in infrastructure investments, completed the acquisition of Forgital Group, a major producer of cutting-edge forged parts utilized in a variety of industrial applications, including power generation and energy infrastructure. The goal of the investment is to improve Forgital's capacity to manufacture high-precision forged rings and parts for vital infrastructure machinery.

Air Insulated Ring Main Unit Market Restraint

High Installation Costs to Restrain the Market

The high installation costs are a significant impediment to the expansion of the air insulated ring main unit (RMU) market. Even though air insulated RMUs are thought to be cost-effective when compared to some gas-insulated alternatives, the total implementation of these systems necessitates a significant expenditure in medium-voltage switchgear, transformers, cables, protection systems, and supporting distribution infrastructure. Additionally, utilities and industrial plants must invest in site preparation, installation, testing, and integration with existing grid networks, which can significantly increase overall project costs.

Air Insulated Ring Main Unit Market Opportunity

Increasing Integration of Renewable Energy to Drive Market Growth

The market for air insulated ring main units (RMUs) is expanding, driven in large part by the greater integration of renewable energy sources such as solar and wind power into electricity distribution networks. The number of renewable energy installations connected to medium-voltage distribution networks is increasing rapidly as nations accelerate their transition to clean energy to lower carbon emissions. Air insulated RMUs are essential to these systems, as they provide switching, protection, and fault isolation, all of which are necessary to maintain a reliable power flow between renewable energy facilities and the distribution network.

• In October 2025, a key milestone in the development of India's power transmission sector was the delivery of the nation's first domestically produced 220 kV Mobile Gas-Insulated Switchgear (m-GIS) System by Toshiba Transmission & Distribution Systems (India) Private Limited (TTDI) to Power Grid Corporation of India (POWERGRID). Additionally, the introduction solidifies POWERGRID's position as a leader in fostering technology innovation, standardization, and indigenization across India's transmission infrastructure.

Segmentation

Key Insights

The report covers the following key insights:

• Micro Macro Economic Indicators
• Drivers, Restraints, Trends, and Opportunities
• Business Strategies Adopted by Key Players
• Impact of AI on the Global Air Insulated Ring Main Unit Market
• Consolidated SWOT Analysis of Key Players

Analysis By Installation Type

The market is segmented by installation type into Indoor RMU and Outdoor RMU.

The indoor RMU segment is the most popular segment of the air insulated ring main unit industry due to its widespread use in urban power distribution grids, commercial buildings, industrial facilities, and substations. Indoor RMUs are favored as they shield users from dust, humidity, and harsh weather while also being simple to maintain and use safely.

• The International Energy Agency (IEA) predicts that global electricity demand will increase by 3-4% per year between now and 2030, necessitating significant investments in distribution infrastructure and medium-voltage equipment, such as the RMUs used in substations and urban power grids.

Outdoor RMU is the second-leading segment in the air insulated ring main unit market due to its extensive use in utility distribution networks and infrastructure projects. Outdoor RMUs are widely installed in urban power distribution systems, renewable energy installations, and industrial facilities where reliable medium-voltage switching and protection are required.              

Analysis By Voltage Rating

Based on voltage rating, the market is divided into up to 15 kV, 15-25 kV, and above 25 kV.

The 15-25 kV segment dominates the market. The air insulated ring main unit (RMU) market is driven by the 15–25 kV voltage range, as this is commonly used in medium-voltage power distribution networks. This section is vital to urban and industrial power supply systems as it covers the 11 kV, 13.8 kV, 15 kV, and 22 kV ranges, which fall within the 15–25 kV range, where utilities often manage distribution grids.

• The U.S. Department of Energy (DOE) claims that electricity supplied to distribution networks is often reduced from transmission levels to medium-voltage levels below 34.5 kV, which are then used for local distribution infrastructure and equipment, such as RMUs and switchgear.

Above 25 kV is the second dominant segment in the market. Due to its growing use in renewable energy projects, industrial power systems, and high-capacity distribution networks, the 25 kV segment is the second-largest in the air insulated ring main unit (RMU) market. Electricity is frequently delivered from substations to large industrial sites, infrastructure projects, and urban load centers via distribution systems operating at voltages above 25 kV. RMUs with air insulation designed to handle these voltage levels provide dependable switching, protection, and fault isolation in medium-to-high-voltage distribution networks.

Analysis By Application

By application, the market is segmented into distribution utilities, renewable energy systems, industrial power distribution, infrastructure projects, and commercial buildings.

Distribution utilities are the dominant application segment in the market. Due to the widespread use of RMUs in medium-voltage electricity distribution networks, the air insulated ring main unit (RMU) industry is dominated by the distribution utilities sector. To assure a dependable power supply, fault isolation, and network protection, utilities install RMUs in substations, feeder lines, and metropolitan distribution networks.

• The U.S. electric grid, which provides electricity to some 153 million consumers, has over 55,000 substations and approximately 6.3 million miles of distribution lines, according to the U.S. Department of Energy. Ring main units and medium-voltage switchgear are examples of the switching and protection gear needed for these vast distribution networks.

Regional Analysis

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By region, the market is categorized into Europe, North America, Asia Pacific, Latin America, and the Middle East & Africa.

The air insulated ring main unit market in Europe is set to register the highest CAGR in the coming years due to increasing investments in grid modernization and the expansion of renewable energy infrastructure.

The North America air insulated ring main unit market is growing primarily due to increased investments in electricity distribution infrastructure, grid modernization, and renewable energy integration, which are driving the expansion of the market for air insulated RMUs in North America. The U.S. and Canada are upgrading aging power grids to meet growing electricity demand and increase dependability. To provide reliable switching, protection, and fault isolation, air insulated RMUs are often used in medium-voltage distribution networks, substations, and metropolitan power systems.

The Asia Pacific air insulated ring main unit market is growing due to the rapid expansion of power distribution infrastructure, increasing electricity demand, and strong investments in renewable energy projects across the region.

• In June 2025, the next-generation smart RMU from Zhejiang Kenjing Electric is intended for use in contemporary distribution networks. The device integrates IoT communication, real-time monitoring, and automatic fault detection, enabling utilities to remotely monitor distribution networks and quickly identify faults. These intelligent RMUs are designed for China's renewable energy integration projects, industrial infrastructure, and urban electricity grids.

Key Players Covered

The global air insulated ring main unit market is fragmented, with a large number of providers. Various market initiatives, R&D activities, and other factors are anticipated to drive market growth. In September 2025, Schneider Electric signed a long-term framework agreement with E.ON to provide SF₆-free medium-voltage (MV) switchgear equipment throughout E.ON's network in Europe. Through this partnership, E.ON can expand the implementation of AirSeT technologies, both primary switchgear (GM-AirSeT) and secondary Ring Main Units (RM-AirSeT), on a regular annual basis. To demonstrate SF6-free gas-insulated primary switchgear (GIS), a pilot project was initially carried out in Westnetz, one of E.ON's subsidiaries, laying the groundwork for wider deployment. The trial's success demonstrates Schneider Electric's faith in the AirSeT's design and performance. In the U.S., the top 5 players account for around 60% of the market.

The report includes the profiles of the following key players:

• ABB Ltd. (Switzerland)
• Siemens AG (Germany)
• Schneider Electric (France)
• Eaton Corporation (Ireland)
• Lucy Electric Ltd. (U.K.)
• Ormazabal (Spain)
• Toshiba Energy Systems and Solutions Corporation (Japan)
• Tavrida Electric (Switzerland)
• LS Electric Co., Ltd. (South Korea)
• CG Power and Industrial Solutions Ltd. (India)

Key Industry Developments

• October 2025: CG Power & Industrial Solutions Ltd. announced a USD 86.02 million investment to construct a new switchgear production facility in western India. The facility will manufacture medium-voltage distribution equipment, including ring main unit (RMU) technologies and air insulated switchgear, to aid grid modernization and the expansion of power infrastructure.
• September 2025: Iberdrola selected Ormazabal to supply 33 kV medium-voltage grid connection technology for the Boldekow solar park in Germany. The project includes innovative distribution switchgear solutions such as air insulated ring main unit (RMU) systems, which play a critical role in renewable energy grid connections by ensuring reliable power distribution, operational safety, and efficient integration of solar power into the medium-voltage network.