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U.S. imports of power, distribution & specialty transformers (NAICS 335311) totaled $966.9M in July 2026, traded with 74 countries.
Importers of Power, Distribution & Specialty Transformers paid $151.2M in duties in July 2026 — an effective duty rate of 17% on $906.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Power, Distribution & Specialty Transformers imports of $966.9M in July 2026 ran 10% above the year-to-date monthly average of $878.4M.
Last updated: July 2026 dataVoltage transformation equipment — from small distribution units to large power transformers serving utility grids — occupies a strategically sensitive position in US energy infrastructure, and the Department of Energy has issued procurement restrictions on certain foreign-sourced bulk-power system transformers. Section 301 tariffs apply to many transformer components and finished units imported from China, adding cost pressure to a product category already characterized by long lead times and custom engineering. Classification under this NAICS code spans a wide range of kVA ratings and design types, each of which may map to a different HTS heading with distinct duty treatment. Domestic manufacturing capacity for large power transformers is limited, making import sourcing decisions consequential for grid reliability planning.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
13.0K shipments/mo
The Department of Energy has authority under Executive Order 13920 to restrict acquisition of bulk-power system electric equipment — including large power transformers — from suppliers with ties to foreign adversaries. Importers of grid-scale transformers must assess whether their supplier and equipment fall within the scope of these restrictions, which are separate from standard customs tariff requirements.
HTS headings for transformers are subdivided by power-handling capacity (kVA or MVA ratings), with different subheadings and duty rates applying at various thresholds. A transformer that falls just above or below a rating breakpoint can land in a materially different tariff category, so precise technical specifications must be confirmed before filing an entry.
NAICSSector 33
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National industry 3 of 4 in naics industry 33531
National industry 335311 · $966.9M of $6.6B
Imports · July 2026
origin
Mexico and Korea, South together supply 44% of it.
customs district
Census does not publish district detail for this classification system.
destination
None recorded for this period.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$966.9MYoY · Pro
Exports
$67.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.