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SITCSection 7
U.S. imports of ac electric generators (alternators) (SITC 71632) totaled $115.6M in April 2026, traded with 50 countries.
Importers of AC Electric Generators (Alternators) paid $12.4M in duties in April 2026 — an effective duty rate of 19% on $66.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. AC Electric Generators (Alternators) imports of $115.6M in April 2026 ran 11% below the year-to-date monthly average of $129.8M.
Last updated: April 2026 dataAlternating-current generators — commonly called alternators — range from small portable gensets to utility-scale synchronous machines used in power plants and industrial standby systems, all captured under SITC 71632. Output rating, number of phases, power factor, and voltage class are the primary specification parameters that determine both commercial value and applicable HTS subheading. Demand is driven by grid-reliability investment, data-center backup power requirements, and renewable energy integration, where AC generators serve as the conversion interface between mechanical prime movers and the electrical grid.
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A generating set — comprising an engine and an AC generator mounted on a common base — is generally classified as a generating set rather than as a standalone generator or engine. The applicable heading depends on the type of prime mover (e.g., spark-ignition, compression-ignition, or gas turbine). Importers should confirm the combined-unit classification with their customs broker, as it differs from the standalone generator heading.
CBP and trade counsel typically look for rated output in kVA or kW, number of phases (single or three), rated voltage and frequency, power factor, and whether the unit is a synchronous or asynchronous (induction) type. For very large machines, the cooling method (air, hydrogen, or water) and insulation class may also be relevant. Providing a complete OEM datasheet with the entry package reduces the risk of examination delays.
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Monthly import values over time