Underground Transmission Line Market Analysis | 2026-2035

Market Size & Opportunities

Global Demand Analysis & Sales Opportunities in the Underground Transmission Line Market

• The annual demand for underground transmission line was USD 25.3 billion in 2024 and is expected to reach USD 26.8 billion in 2025, up 6.0% from the value in 2024.

• During the forecast period (2026-2035), the market is expected to grow at a CAGR of 6.9%. The annual demand will reach USD 52.0 billion in 2035, which is almost 1.9 times the demand in 2025.

• Asia-Pacific had a market share of >36% in 2024, generating the largest demand across regions.

• Underground cables (led by HV / EHV XLPE land cables, with HVDC land cables the fastest-growing) account for most value.

• Among the voltage classes, high and extra-high voltage generate the highest demand, while UHV and HVDC grow the fastest over the forecast period.

• By end user, power utilities/T&D operators are anticipated to remain dominant, whereas renewable energy developers will be the fastest-growing end user over the years.

“According to a Senior Analyst at Stratview Research, the global underground transmission line market will generate a cumulative sales opportunity worth USD 388.5 billion during 2026-2035. During the next ten years, HVDC land cables, high and UHV voltage, renewable energy developers, and Europe are some of the high-opportunity segments to bank upon.”

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Market Statistics

Have a look at the sales opportunities presented by the underground transmission line market in terms of growth and market forecast.

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Market Dynamics

Underground transmission lines carry electrical power through insulated cables buried beneath the surface rather than on overhead structures. The underground transmission line market encompasses the insulated land cables used for high-voltage and extra-high-voltage transmission, principally HV / EHV XLPE land cables and HVDC land cables, together with the limited bare conductors used at transition points.

Underground transmission is the fastest-growing land installation type, driven by underground for urban reliability, resilience, and aesthetics, the build-out of long-distance HVDC land links, and the integration of renewable energy, even though it remains substantially more expensive than overhead for bulk transmission.

Market Drivers:

Underground for Reliability, Resilience, and Urbanization

The leading driver of the underground transmission line market is the accelerating shift toward underground for reliability, resilience, and aesthetics. Utilities and cities are increasingly replacing overhead lines with insulated underground cables in dense urban areas, disaster-prone regions, and locations with strong visual-impact requirements, because buried cables are far less exposed to storms, wildfires, vegetation, and accidents that cause outages on overhead lines. Rapid urbanization and the expansion of cities into former transmission corridors reinforce this trend, as does the growing political and regulatory emphasis on grid resilience following extreme-weather events. New substations and grid connections in built-up areas are routinely specified underground. Because underground cables and their accessories command far higher value per kilometer than overhead conductors, this substitution lifts both demand and average value. Together with renewable connections and rising electricity consumption, underground for reliability and resilience anchors the strong, structural growth of underground transmission throughout the forecast period.

HVDC Land Links and Grid Modernization

A second major driver is the build-out of long-distance HVDC land links and broad grid modernization. HVDC land cables move large blocks of power between regions with low losses, making them increasingly attractive for interregional transfer, the evacuation of remote renewable generation, and the reinforcement of congested grids. A growing pipeline of HVDC land projects is lifting demand for high-value EHV cables and accessories. Grid modernization and the replacement of aging assets in mature markets, alongside entirely new transmission capacity in fast-growing economies, sustain steady demand for land cables. Rising electricity consumption from electrification, industrialization, and data centers adds baseline growth, while the connection of large renewable projects often requires underground segments. National grid plans and interconnection programs across Europe, India, China, and the United States translate these needs into multi-year cable procurement. Together, HVDC land links and modernization broaden underground demand well beyond urban reliability alone across the forecast period.

“As per the analyst, the global transmission and grid industry is evolving fast. While conducting the market analysis and speaking with the leading players, it is quite clear that the next decade will be defined by underground for resilience, HVDC land links, and grid modernization.”

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Market Challenges:

High Capital Cost, Long Lead Times, and Installation Complexity

The defining challenge of underground transmission is its very high cost and complexity relative to overhead lines. Underground cable systems can cost several times more than equivalent overhead lines, owing to expensive insulated cables, extensive civil works such as trenching and ducting, and specialized accessories, which limit underground systems to applications where reliability, resilience, or aesthetics justify the premium. Projects also carry long lead times, since high-voltage cables must be manufactured, delivered, installed, and joined with great precision. Installation is technically demanding, high-voltage cable jointing is a highly skilled craft, and a shortage of certified jointers and crews can delay projects and raise the risk of installation-related failures, which are a leading cause of cable faults. Permitting, right-of-way, and civil works approvals add further delay. Together, high capital cost, long lead times, and installation complexity constrain how quickly underground capacity can be added, even where demand for reliability is strong.

Cable Factory Capacity and Material-Price Volatility

Underground transmission is constrained by limited manufacturing capacity and exposure to material-price volatility. The number of qualified extra-high-voltage and HVDC land-cable factories is small, so manufacturing capacity can lag demand, lengthening delivery timelines, while building new capacity requires very large, long-lead investments committed only against contracted demand. This creates a structural lag between order surges and added capacity and concentrates on the high-value segment among a limited group of qualified suppliers, raising barriers for new entrants. The market is also exposed to volatility in copper, aluminium, and insulation-material prices, which complicates fixed-price tendering on multi-year contracts and can erode margins when input costs rise. Supply-chain constraints on key accessories such as joints and terminations can further delay commissioning. Managing these capacity, qualification, and cost risks is central to delivering underground cable projects on schedule and on budget throughout the forecast period.

Segments' Analysis

By Product

“Underground cables account for the overwhelming majority of value, led by HV/EHV XLPE land cables, with HVDC land cables the fastest growing; conductors at transition points remain a small share.”

The market is segmented by conductors and cables into underground cables (HV / EHV XLPE land and HVDC land) and conductors. Underground cables account for the overwhelming majority of value, since underground lines are built primarily with insulated cables, with HV / EHV XLPE land cables the largest sub-segment and HVDC land cables the fastest growing, driven by long-distance bulk power transfer. Bare conductors, used only at limited transition points, remain a small share.

By Voltage Type

“High and extra-high voltage holds the largest share, whereas UHV (>230 kV) is expected to be the fastest-growing voltage type during the forecast period.”

The market is segmented into low (<33 kV), medium (33-132 kV), high (132-230 kV), and UHV (>230 kV). High and extra-high voltage holds the largest share, reflecting the concentration of underground value in HV and EHV land cables, while UHV (>230 kV) is likely to be the fastest-growing voltage type, supported by high-capacity, interregional, and HVDC corridors built to move large blocks of power.

By End User

“Power utilities/T&D operators are expected to remain dominant, whereas renewable energy developers are likely to be the fastest-growing end user during the forecast period.”

The market is segmented into power utilities/T&D operators, renewable energy developers, industrial & infrastructure, and EPC contractors. Power utilities/T&D operators are expected to remain dominant, owing to their ownership and operation of transmission networks, while renewable energy developers are likely to be the fastest-growing end user, driven by onshore and offshore wind and solar grid connections. Industrial & infrastructure users and EPC contractors also expand steadily.

Regional Analysis

“Asia-Pacific is projected to lead the underground transmission line market in terms of market share, driven by large-scale urban cable build-out in China and India, while Europe is among the fastest-growing on the back of undergrounding and HVDC land links.”

Asia-Pacific leads on the strength of extensive urban and grid cable build-out across China and India, while Europe is among the fastest-growing, propelled by undergrounding for resilience and a deep pipeline of HVDC land links. North America grows through underground and grid expansion.

Among countries, China, India, Germany, and the USA are the largest and among the fastest-growing markets, while the Rest of the World contributes through urban grid projects.

“Analysis suggests that the Top 10 countries generate >38% of the annual sales for the underground transmission line. A few countries are the demand powerhouses and will drive the regional markets in big ways, offering attractive business opportunities.”

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Competitive Landscape

The market is moderately concentrated in the high-value cable segments, where a small group of global cable majors leads EHV and HVDC land systems, alongside strong regional players. Competition centers on technology, project track record, manufacturing capacity, and reliability.

The following are the key players in the underground transmission line market.

• Prysmian Group

• Nexans S.A.

• NKT A/S

• Sumitomo Electric Industries, Ltd.

• LS Cable & System Ltd.

• Hellenic Cables (Cenergy Holdings)

• Furukawa Electric Co., Ltd.

• ZTT Group (Jiangsu Zhongtian Technology)

• Jiangsu Hengtong Group

• Sterlite Power (Sterlite Technologies Ltd.)

• KEI Industries Ltd.

Note: The above list is not an exhaustive list of the key players in the market. If your company is active in this market and would like to be considered for inclusion in future editions of this study, please contact us at [email protected].

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Recent Developments / Mergers & Acquisitions

Recent mergers & acquisitions, product launches, and other developments in the underground transmission line market reflect evolving market trends and impact the market. Below are a few recent developments in the market -

• In April 2024, Prysmian Group agreed to acquire Encore Wire for about US$ 4 billion in enterprise value; the deal closed in the second half of 2024.

• In March 2025, Nexans signed a major framework agreement with RTE, the French transmission system operator, to supply, install, and commission HVDC subsea and onshore cables.

• In March 2024, Prysmian introduced its PRY-MOULD one-piece premoulded 525 kV joint, a fully factory-tested, maintenance-free accessory for high-voltage cable systems.

• In July 2025, LS Cable & System announced an investment of about US$ 689 million in a new cable manufacturing plant in Virginia, USA.

• In May 2024, Sterlite Power secured approval to demerge its transmission business, retaining its power conductors, EHV/HV/MV cables, and OPGW under the renamed Sterlite Electric.

Report Scope

Market Definition

Underground transmission lines carry power through insulated cables buried beneath the surface. The market encompasses HV / EHV XLPE land cables and HVDC land cables, together with the limited bare conductors used at transition points and the cable joints, terminations, and civil works they require. Underground cables account for the overwhelming majority of value, with HVDC land cables the fastest growing.

Report Structure

This report provides market intelligence most comprehensively. The report structure has been kept so that it offers maximum business value. It provides critical insights into market dynamics and will enable strategic decision-making for existing market players as well as those willing to enter the market.

The following are the key features of the report:

• Market structure: Overview, industry life cycle analysis, supply chain analysis.

• Market environment analysis: Growth drivers and constraints, Porter’s five forces analysis, SWOT analysis.

• Market trend and forecast analysis.

• Market segment trend and forecast.

• Competitive landscape and dynamics: Market share, product portfolio, new product launches, etc.

• Attractive market segments and associated growth opportunities.

• Emerging trends.

• Strategic growth opportunities for the existing and new players.

• Key success factors.

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Segmentation

The report provides detailed insights into the market dynamics to enable informed business decision-making and growth strategy formulation based on the opportunities present in the market.

The underground transmission line market is segmented into the following categories:

Underground Transmission Line Market, By Product

• Underground Cables (HV / EHV XLPE Land and HVDC Land)

• Conductors

Underground Transmission Line Market, By Voltage Type

• Low (<33 kV)

• Medium (33-132 kV)

• High (132-230 kV)

• UHV (>230 kV)

Underground Transmission Line Market, By End User

• Power Utilities / T&D Operators

• Renewable Energy Developers

• Industrial & Infrastructure

• EPC Contractors

Underground Transmission Line Market, By Region

• North America (Country Analysis: The USA, Canada, and Mexico)

• Europe (Country Analysis: Germany, France, Italy, Spain, and Rest of Europe)

• Asia-Pacific (Country Analysis: China, India, Japan, Australia, and Rest of Asia-Pacific)

• Rest of the World (Country Analysis: Brazil, Iran, Saudi Arabia, and Others)

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Research Methodology

This strategic assessment report from Stratview Research provides a comprehensive analysis that reflects today’s underground transmission line market realities and future market possibilities for the forecast period.

The report segments and analyzes the market in the most detailed manner to provide a panoramic view of the market. The vital data/information provided in the report can play a crucial role for market participants and investors in identifying the low-hanging fruits available in the market and formulating growth strategies to expedite their growth process.

This report offers high-quality insights and is the outcome of a detailed research methodology comprising extensive secondary research, rigorous primary interviews with industry stakeholders, and validation and triangulation with Stratview Research’s internal database and statistical tools.

More than 1,000 authenticated secondary sources, such as company annual reports, fact books, press releases, journals, investor presentations, white papers, patents, and articles, have been leveraged to gather the data.

We conducted more than 10 detailed primary interviews with market players across the value chain in all four regions and industry experts to obtain both qualitative and quantitative insights.

Customization Options

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Company Profiling

• Detailed profiling of additional market players (up to three players)
• SWOT analysis of key players (up to three players)

Competitive Benchmarking

• Benchmarking of key players on the following parameters: Service portfolio, geographical reach, regional presence, and strategic alliances

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