Power Transformer Cooling Systems - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026-2031)

The power transformer cooling systems market size is projected to expand from USD 1.24 billion in 2025 and USD 1.36 billion in 2026 to USD 2.11 billion by 2031, at a CAGR of 9.19% between 2026 and 2031. This report is Segmented by Cooling Method (ONAN, ONAF, OFAF, OFWF, Other), Cooling Equipment (Radiators and Cooling Panels, and More), End User (Utilities, Independent Power Producers, Industrial and Mining, and More), and Geography (North America, Europe, Asia-Pacific, South America, Middle East and Africa). The Market Forecasts are Provided in Terms of Value (USD).

Global Power Transformer Cooling Systems Market Trends and Insights

Grid Modernization and Aging Transformer Replacement

Grid operators face rising demand while large new transformers remain difficult to secure within short project schedules. FirstEnergy announced a USD 36 billion capital plan for 2026 through 2030, including more than USD 19 billion for transmission infrastructure. Large power transformers averaged 128 weeks for delivery by mid-2025, and generator step-up units averaged 144 weeks. These lead times make ONAF-to-OFAF conversion kits, replacement radiator banks, and updated control panels practical capacity measures for equipment already operating on the grid. Digitized legacy cooler drawings and compatible retrofit designs can reduce the engineering effort needed to match old equipment interfaces. Modular cooling upgrades also allow utilities to uprate selected transformers while replacement equipment remains on order.

Renewable Energy Integration and Higher Thermal Cycling

Wind and solar generation expose transformers to repeated top-oil and winding hot-spot temperature changes during rapid output ramps. These operating patterns create more cumulative thermal fatigue than conventional generation profiles. Harmonic currents from grid-tied inverters can increase stray and eddy-current losses and create localized hot spots beyond models based on steady operating conditions. The power transformer cooling systems market benefits when generator step-up transformers need OFAF cooling rather than ONAF configurations. Renewable generation patterns were associated with transformer failure rates in research that examined location and operating timing, especially in areas with east-west photovoltaic installations. This need also supports monitoring systems that activate cooling equipment in response to observed thermal conditions.

CRGO Steel, Copper, Aluminum and Component Lead-Time Volatility

Material price changes can reduce cooling system margins and increase the cost of projects for end users. The supplied research states that copper and aluminum together account for more than 60% of power transformer manufacturing costs. It also reports that CRGO silicon steel prices increased from USD 1,700 per ton to USD 2,300 per ton between 2020 and 2025, while power transformer prices rose 77% over that period. These pressures shorten quotation validity periods for suppliers of radiators, pumps, fans, and other cooling equipment. Long-term contracts may therefore include escalation clauses that pass changes in input costs into project pricing. Domestic content conditions for federally funded U.S. projects can further limit sourcing choices for CRGO steel and copper inputs.

Other drivers and restraints analyzed in the detailed report include:

• Hyperscale Data Center and Electrification Load Growth
• Industrial and Mining Electrification in Emerging Economies
• High Installed Cost and Skilled-Service Requirements

Segment Analysis

ONAF held 36.8% of the power transformer cooling systems market share in 2025 because it serves the medium-load range where fan cooling provides sufficient heat removal. Its installed base includes bulk distribution substations, industrial service transformers, and commercial grid equipment across regions. The arrangement uses forced-air fans while avoiding the cost and maintenance needs of active oil circulation. ONAN systems continue to serve lower-load and rural applications because they do not require ancillary power for fans or pumps. Their passive design also has low maintenance requirements. OFWF serves a smaller application group that includes traction, pumped-storage hydro, and industrial furnace transformers. Water availability allows OFWF systems to achieve high heat rejection with a smaller site footprint.

OFAF is projected to expand at a 9.8% CAGR from 2026 through 2031, the fastest rate among cooling methods in the supplied research. The power transformer cooling systems market size for OFAF is supported by offshore wind generator step-up units and data center connections that operate under sustained thermal loads. Large compact transformers can lack enough room for the radiator surface area that an ONAF configuration would require. A technical review found that OFAF and oil-directed air-forced systems are increasingly specified for transformers above 40 MVA to 60 MVA under high or variable loads. Active oil pumping improves thermal performance compared with passive oil circulation. IEC 60076-1 and the wider IEC 60076 series govern cooling classifications and factory thermal testing for new and upgraded units.

Complete Report Scope:

• By Cooling Method
  • Oil Natural Air Natural (ONAN)
  • Oil Natural Air Forced (ONAF)
  • Oil Forced Air Forced (OFAF)
  • Oil Forced Water Forced (OFWF)
  • Other Cooling Systems
• By Cooling Equipment
  • Radiators and Cooling Panels
  • Cooling Fans and Blowers
  • Oil Pumps and Valves
  • Oil-to-Air Heat Exchangers
  • Oil-to-Water Heat Exchangers
  • Cooling Control Panels and Monitoring Units
  • Other Cooling Equipment
• By End User
  • Utilities
  • Independent Power Producers
  • Industrial and Mining
  • Commercial Infrastructure and Data Centers
  • Renewable Energy Operators
  • Rail and Traction Operators
  • Other End Users
• By Geography
  • North America
    • United States
    • Canada
    • Mexico
  • Europe
    • Germany
    • France
    • Italy
    • Spain
    • United Kingdom
    • Poland
    • Russia
    • Rest of Europe
  • Asia-Pacific
    • China
    • India
    • Japan
    • South Korea
    • Australia
    • Indonesia
    • Vietnam
    • Thailand
    • Rest of Asia-Pacific
  • South America
    • Brazil
    • Argentina
    • Chile
    • Rest of South America
  • Middle East and Africa
    • Saudi Arabia
    • United Arab Emirates
    • Egypt
    • South Africa
    • Morocco
    • Rest of Middle East and Africa

Geography Analysis

Asia-Pacific accounted for 43.6% of the power transformer cooling systems market share in 2025 and is forecast to grow at an 11.3% CAGR through 2031. China’s 1,000 kV AC and ±800 kV DC ultra-high-voltage backbone investments support demand for OFAF and OFWF systems used in high-MVA transformers. India’s Revamped Distribution Sector Scheme is a USD 34.76 billion program that supports transformer procurement and cooling upgrades across transmission and distribution. Japan’s energy efficiency standards for transformers became effective in 2026 and target an 11.4% improvement across 24 transformer categories. These requirements support the replacement of less efficient cooling configurations. Indonesia, Vietnam, and Thailand are expanding grid capacity, which supports both new installation and retrofit demand.

North America and Europe form the next-largest regional cluster in the supplied research, with demand shaped by transformer supply constraints. Hitachi Energy announced more than USD 1 billion of U.S. manufacturing investment in September 2025, including USD 457 million for a large power transformer facility near South Boston. The power transformer cooling systems market in these regions also benefits from equipment replacement and cooling retrofits during supply shortages. Hitachi Energy signed an agreement worth up to USD 700 million with E.ON in July 2025 for German grid infrastructure delivery. Stadtwerke Karlsruhe began a five-year program in 2025 to invest more than EUR 36 million, or USD 39 million, in high-voltage infrastructure and replace 9 end-of-life transformers across 4 substations. Offshore wind additions in the North Sea and Baltic also support demand for marine-grade OFAF and OFWF systems in generator step-up transformers above 100 MVA.

South America and the Middle East and Africa have smaller combined shares but remain important expansion areas through 2031. WEG announced BRL 543 million, or USD 99 million, of investment in transformer capacity in Brazil, including capacity for voltage classes up to 230 kV. The Betim expansion was expected to add 10% of production capacity by mid-2026. WEG also supplied three single-phase 500 MVA transformers at 525 kV for Brazil’s Assis Substation. Saudi Arabia’s Vision 2030 grid program, data center development in the UAE, and North African solar projects support new transformer demand. Sub-Saharan Africa offers longer-term potential as electrification and industrial investment increase.

List of Companies Covered in this Report:

• ABB Ltd.
• Alfa Laval AB
• Bharat Heavy Electricals Limited
• CG Power and Industrial Solutions Limited
• GE Vernova Inc.
• Hitachi Energy Ltd.
• Hyosung Heavy Industries Corporation
• Kelvion Holding GmbH
• Luvata Söderköping AB
• M&I Materials Limited
• Modine Manufacturing Company
• Radiator Manufacturing Company
• Siemens Energy AG
• SPX Technologies, Inc.
• Sterling Thermal Technology
• Tada Electric Co., Ltd.
• Thermofin GmbH
• Toshiba Energy Systems & Solutions Corporation
• Trantech Radiator Products, Inc.
• United Heat Exchanger
• WEG S.A.

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support