Section 232 Tariff Overhaul: What the New 15% Grid Equipment Rate Means for Transformer and Switchgear Procurement

On April 2, 2026, President Trump signed a proclamation that replaces the flat 50% Section 232 metals tariff with a four-tier system. The new structure takes effect at 12:01 a.m. Eastern on April 6. Among the most significant changes: electrical grid equipment, including transformers, switchgear, and industrial enclosures, gets its own tier at 15% through the end of 2027.

That 15% number is going to get a lot of attention. Some of it will be relief. Some of it will be misplaced.

The rate drop from 50% to 15% looks dramatic on paper, but the simultaneous shift to full customs value assessment, the 21-month sunset, and the downstream effects on domestic manufacturing capacity make this far more complex than the headline suggests. If your procurement team reads “15%” and assumes costs just fell, they are going to get hurt.

Here is what actually changed, what it means for your equipment costs, and what you should be doing about it before the window closes.

The Four-Tier Structure: What Goes Where

The April 2 proclamation replaces the prior flat rate with four distinct annexes, each carrying its own tariff rate and product scope.

Annex I-A (50%): Primary metals. Articles made entirely or almost entirely of aluminum, steel, or copper. Think raw coils, sheet, plate, and bar stock. This is where grain-oriented electrical steel (GOES) sits, and it is the highest rate in the structure.

Annex I-B (25%): Metal-heavy derivatives. Products substantially composed of steel, aluminum, or copper but with other materials and manufacturing value added. Bus duct, cable tray, conduit fittings, and many electrical enclosures fall here.

Annex III (15%, through December 31, 2027): Grid equipment. Transformers, heavy switchgear, metal-intensive industrial machinery, and power-sector equipment classified under HTS headings 9903.82.07 through 9903.82.12 (GHY International, April 2026). This is the temporary transitional tier. After December 31, 2027, everything in Annex III migrates to Annex I-B at 25%.

Annex II (10%): U.S.-metal products. Articles manufactured abroad but made entirely with American-smelted and American-cast metal. This rewards supply chains that source raw materials domestically even when final assembly happens overseas.

Exempt (0%): Low-metal-content products. Products containing 15% or less steel, aluminum, or copper by weight are completely removed from Section 232 scope. This is a new carve-out that did not exist before.

The prior quarterly process for adding derivative products to Section 232 coverage is terminated. Commerce and USTR now jointly determine additions when imports threaten to undermine the tariff regime (National Law Review, April 2026).

The Full Customs Value Shift: Why 15% Is Not What It Seems

Here is where most people will get this wrong.

Under the old structure, Section 232 tariffs on derivative products applied to the declared metal content value within the product. A $1.4 million imported large power transformer with roughly $700,000 in metal content paid 50% on that $700,000, or $350,000 in tariff.

Under the new rules, tariffs apply to the full customs value of the imported article. That same $1.4 million transformer now pays 15% on $1.4 million, or $210,000 in tariff (CustomsIntel, April 2026).

In this example, yes, the net tariff dropped from $350,000 to $210,000. That is a 40% reduction in the tariff hit. Good news.

But the math changes depending on the metal-content ratio of each product:

Product	Value	Metal Content	Old Tariff (50% on metal)	New Tariff (15% on full value)	Change
Large power transformer	$1,400,000	~50%	$350,000	$210,000	-40%
Distribution transformer	$85,000	~65%	$27,625	$12,750	-54%
Metal-clad switchgear	$320,000	~70%	$112,000	$48,000	-57%
Dry type transformer	$45,000	~45%	$10,125	$6,750	-33%
Control transformer	$8,000	~30%	$1,200	$1,200	0%

The higher the metal-content ratio, the bigger the savings under the new structure. Products with lower metal content see smaller gains, and items around the 30% metal ratio break even or can actually pay more.

Key takeaway: Run the math on your specific product mix. Do not assume a blanket cost reduction.

The 21-Month Window: A Procurement Cliff

The 15% Annex III rate is not permanent. It expires December 31, 2027, at which point covered grid equipment transitions to Annex I-B at 25% on full customs value (GHY International, April 2026).

That 67% rate increase from 15% to 25% is baked into the proclamation. It is not contingent on another executive action or Congressional vote. Unless a subsequent proclamation extends or modifies Annex III, the sunset is automatic.

Now consider this against transformer lead times:

• Large power transformers (100+ MVA): 104 to 130 weeks, per DOE data
• Medium power transformers (10-100 MVA): 52 to 78 weeks
• Distribution transformers (under 10 MVA): 8 to 16 weeks for standard configurations
• Heavy switchgear lineups: 40 to 60 weeks for engineered-to-order configurations

An order for a large power transformer placed today, in April 2026, with a 24-month lead time, delivers in April 2028. That is four months after the 15% rate expires. The tariff on that unit will be 25%, not 15%.

For distribution transformers and standard switchgear, the window works. Orders placed through roughly Q2 2027 can still land under the 15% rate. But for anything with a lead time beyond 18 months, the window is already closing.

Procurement teams that recognize this have a narrow opportunity to lock in equipment at 15% by placing orders immediately for items with lead times that fit inside the December 2027 deadline.

Domestic Sourcing Gets a Structural Advantage

The 10% Annex II rate for products made entirely with U.S.-smelted and U.S.-cast metal creates the clearest cost incentive for domestic sourcing that the tariff regime has ever offered.

For context, only about 20% of U.S. transformer demand is met by domestic suppliers, according to DOE estimates. The domestic manufacturing base includes:

• ERMCO (Mississippi): The largest U.S.-based distribution transformer manufacturer, with meaningful domestic steel sourcing
• Howard Industries (Mississippi): Distribution transformers with U.S. operations
• GE Vernova (multiple U.S. facilities): Doubling production at its Stafford facility by end of 2026 (Smart Grids Canada, 2026)
• Eaton (multiple U.S. facilities): $340 million South Carolina three-phase transformer plant targeting 2027 start
• Hitachi Energy (U.S. expansion): $457 million facility in South Boston, Virginia, set to become the nation’s largest large power transformer plant by 2028
• Siemens Energy (Charlotte, NC): $150 million large power transformer plant, production expected early 2027

The gap between 10% (domestic metal) and 15% (imported grid equipment) is real but narrow. The gap between 10% and the post-2027 rate of 25% is where domestic sourcing becomes a structural advantage. Distributors who build domestic supplier relationships now will have a cost moat when the Annex III window closes.

The catch: domestic capacity is already constrained. Every manufacturer listed above is at or near capacity. New facilities do not come online until 2027-2028. The demand surge this tariff structure incentivizes will hit a supply base that cannot absorb it.

No Rate Stacking: One Rate, One Product

A transformer contains both steel (core laminations) and copper (windings). Under the restructured rules, goods containing more than one covered metal are subject to the applicable duty rate once. Rates do not stack per metal (GHY International, April 2026).

The highest applicable rate governs. For a transformer with steel and copper in Annex III, the rate is 15% on the full customs value, not 15% on the steel portion plus 15% on the copper portion.

This is a significant clarification. Under previous guidance, there was ambiguity about how multi-metal articles would be assessed. The proclamation resolves that question clearly.

USMCA and Trade Agreement Provisions

Manufacturing drawback under 19 U.S.C. 1313(a)-(b) is available for Annex I-B and Annex III articles that meet two conditions: (1) the article is a product of a Trade Agreement Partner (currently the UK, EU, Japan, South Korea, Mexico, and Canada), and (2) the metal content was smelted or cast in a Trade Agreement Partner country (GHY International, April 2026).

This matters for the transformer and switchgear market because Mexico and Canada are significant manufacturing and component suppliers under USMCA. Transformers assembled in Mexico using Canadian-smelted steel may qualify for drawback, reducing the effective tariff burden.

UK-origin goods receive preferential treatment: 25% for Annex I-A articles (vs. 50% for other origins) and 15% for Annex I-B articles (vs. 25%). This is a diplomatic carve-out, but its practical impact on the North American electrical equipment market is limited since UK-origin transformer and switchgear volume is small.

For procurement teams working with USMCA-origin suppliers, the drawback provision is worth investigating with your customs broker. It will not eliminate the tariff, but it can reduce the effective rate on qualifying products.

NEMA Opposed This. Here Is Why That Matters.

The National Electrical Manufacturers Association led a coalition of manufacturers, contractors, builders, and utilities in opposing Section 232 tariff application to transformers and grid components. NEMA’s core argument: these tariffs would “hinder infrastructure projects, increase energy costs, and jeopardize expansion of semiconductor plants, data centers, and greenfield manufacturing” (tED Magazine, April 2026).

NEMA’s opposition is worth tracking for two reasons:

First, it signals that manufacturers themselves expect cost pass-throughs. When the trade association representing Siemens Energy, Eaton, Hitachi Energy, and ABB warns about cost increases, expect those costs to show up in your quotes within 60-90 days.

Second, NEMA has historically been effective at securing modifications to tariff policy through Commerce Department engagement. The 15% Annex III rate itself may be a partial result of NEMA’s lobbying against the original flat 50% rate. Further modifications are possible, though procurement teams should plan on the current structure as published.

The GOES Bottleneck Does Not Go Away

The 50% rate on Annex I-A articles, which includes grain-oriented electrical steel, means the most critical transformer input material carries the highest tariff rate in the new structure.

Cleveland-Cliffs operates the only domestic GOES production facility and covers an estimated 12-20% of U.S. demand (DOE data; DistroForge Research). The remaining 80%+ is imported, primarily from Japan, South Korea, and Germany.

The 50% tariff on imported GOES feeds directly into transformer manufacturing costs regardless of which Annex the finished transformer falls under. A domestic manufacturer building a transformer in the U.S. with imported GOES pays 50% on the steel before the first winding is wrapped.

This creates a compounding cost problem:

1. Imported GOES arrives at 50% tariff (Annex I-A)
2. That cost flows into the manufactured transformer
3. If the transformer is then exported and reimported (or manufactured abroad), additional tariffs apply

Domestic manufacturers with access to Cleveland-Cliffs GOES have a structural cost advantage, but Cleveland-Cliffs cannot supply the entire market. The GOES bottleneck is the single biggest reason transformer prices will not fall meaningfully despite the 15% grid equipment rate.

Five Actions for Procurement Teams

Based on the restructured tariff math and the 21-month window, here is what your procurement team should be evaluating immediately.

1. Audit your open purchase orders for tariff exposure. Every PO with an expected delivery date after December 31, 2027 is at risk of the 25% Annex I-B rate instead of 15%. Contact your suppliers and freight forwarders to confirm expected customs entry dates, not just delivery dates.

2. Accelerate orders that fit inside the window. Distribution transformers, standard switchgear, and medium power transformers with lead times under 18 months can still land under the 15% rate if ordered by Q2 2026. Run the cost comparison between ordering now at 15% versus waiting and paying 25%.

3. Get your customs classification confirmed. The annex structure depends on HTS classification. If your products are misclassified, you could be paying 25% or 50% on items that should be at 15%. Engage a licensed customs broker to review your product classifications against the Annex III headings (HTS 9903.82.07 through 9903.82.12).

4. Evaluate USMCA drawback eligibility. If you source from Mexican or Canadian manufacturers, or from any Trade Agreement Partner, determine whether your products qualify for manufacturing drawback. This requires documentation of metal origin and smelting location.

5. Build domestic supplier relationships before everyone else does. The 10% domestic-metal rate creates a structural advantage that will persist well beyond the 2027 sunset. Domestic capacity is expanding, with major facilities from Hitachi Energy, Siemens Energy, and Eaton coming online in 2027-2028. Distributors who establish relationships and frame agreements now will have priority access when that capacity arrives.

The Bottom Line

The Section 232 restructuring is not a tariff cut. It is a tariff reorganization that creates temporary relief for grid equipment, permanent advantages for domestic sourcing, and a hard deadline that will catch unprepared procurement teams.

The 15% Annex III rate buys time. It does not buy much of it. Twenty-one months from a standing start, against equipment lead times measured in years, with domestic capacity that will not meaningfully expand until the window is already closing.

The distributors and utilities that treat April 6, 2026 as a starting gun for accelerated procurement will capture real savings. Everyone else will look back at this window the same way they look back at pre-2021 transformer prices: knowing they should have acted sooner.

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DistroForge Research tracks tariff, trade, and procurement policy affecting the electrical distribution market. Analysis is based on publicly available sources including federal proclamations, trade publications, and manufacturer disclosures. This article does not constitute legal or customs advice.

Frequently Asked Questions

What is the new Section 232 tariff rate for transformers and switchgear?

As of April 6, 2026, transformers, switchgear, and other electrical grid equipment fall under Annex III of the restructured Section 232 tariffs at a 15% rate. This is a transitional rate that expires December 31, 2027, after which these products move to Annex I-B at 25%.

How does the full customs value change affect transformer procurement costs?

Previously, Section 232 tariffs applied only to the declared metal content value within a product. The new rules apply tariffs to the full customs value of the imported article. For a transformer where metal content represents roughly 50% of total value, this changes the effective cost calculation significantly, even though the rate dropped from 50% to 15%.

Do tariffs stack if a transformer contains both steel and copper?

No. Under the April 2026 restructuring, goods containing more than one covered metal are subject to the applicable duty rate once, not stacked per metal. The highest applicable rate governs.

Are USMCA-origin transformers exempt from the 15% tariff?

Not exempt, but they qualify for manufacturing drawback under 19 U.S.C. 1313(a)-(b) if the metal content was smelted or cast in a Trade Agreement Partner country (including Mexico and Canada) and the article is not subject to antidumping or countervailing duty orders.

What happens to grid equipment tariffs after December 2027?

When the Annex III transitional rate expires on December 31, 2027, covered grid equipment moves to Annex I-B rates at 25%. That is a 67% tariff rate increase, applied to full customs value.