US and EU grid equipment rules

This is not legal advice. It does not say whether a transformer, a supplier, or a contract is allowed. Read the cited text, and ask counsel before you rely on it. Questions: hello@transformerpath.com.

What is covered

The United States text that names transformers is Executive Order 14421 of 26 August 2026, published at 91 FR 55995 on 31 August 2026. It covers foreign-produced bulk-power system electric equipment. Section 5(b) names substation transformers and instrument transformers, among other items used in bulk-power system substations, control rooms, or power generating stations. The bulk-power system definition includes transmission lines rated at 69 kV or more and does not include facilities used in the local distribution of electric energy.

The order is not a blanket ban. A transaction (an acquisition, importation, transfer, or installation) can be prohibited only after the Secretary of Energy makes the findings in section 2(a), including a connection to a Covered Foreign Entity and one of the risk findings in that section. The transaction must have been initiated after 26 August 2026. The Department of Energy's own FAQ, updated 6 October 2026, says the same thing and says the FAQ itself creates no legal requirement.

The European Commission texts that were read speak about inverters from high-risk suppliers on EU-funded projects, not about power transformers. COM(2026) 501 final of 3 June 2026 says the Commission has restricted the use of EU funds for projects involving inverters from high-risk suppliers. Minutes of the InvestEU Advisory Board the same day say the interim guidance applies to EU-funded solar, wind and energy storage projects implemented through direct or indirect management, and that those projects must comply with the latest cybersecurity guidelines.

Effective dates that are in the texts

• EO 14421 is dated 26 August 2026 and was published on 31 August 2026. Its transaction provision looks at transactions initiated after the date of the order. DOE says the order does not define that moment as contract signature, shipment, delivery, title, or installation.
• Equipment acquired or installed before 26 August 2026 is not automatically prohibited. The Secretary may later set conditions, and must consider reliability, safety, replacement, and continuity before directing isolation, disconnection, replacement, or removal.
• Rules or regulations were directed within 120 days of 26 August 2026, as needed. That count lands on 24 December 2026. The order does not print that calendar date. As of 20 October 2026 the Federal Register item is a request for information, not a final rule. Comments were due 9 October 2026.
• A 2020 DOE prohibition order that did list power transformers and generator step-up transformers at 69 kV, for certain defense-related utility equipment manufactured or supplied by persons owned by, controlled by, or subject to the jurisdiction or direction of the People's Republic of China, was revoked effective 20 April 2021. It is not the current rule.

The 1 November 2026 EU date was not confirmed

This summary was written to cover EU high-risk grid equipment measures applying from 1 November 2026. On 20 October 2026, the EUR-Lex and Commission texts that were opened do not state that date for grid equipment, for inverters, or for transformers. They do confirm an interim restriction on EU funds for projects involving inverters from high-risk suppliers. They do not attach the guidance, do not define high-risk supplier, and do not name a power transformer. A line in the InvestEU minutes about a meeting tentatively in November 2026 is a meeting date, not an equipment rule. Details that appear only in trade press are not treated as confirmed here. If a funder cites 1 November 2026, ask the funder for the guidance.

A proposal for a Cybersecurity Act, COM(2026) 11, is not a regulation in force. A separate, non-binding Commission guidance on Article 28 of the Net-Zero Industry Act (OJ C/2026/123, 7 January 2026) discusses origin documents for net-zero purchase schemes and lists PV inverters under HS heading 8504. That guidance does not name power transformers. Do not read the 8504 row as a rule for a power transformer.

Who is affected

In the United States, section 2(a) speaks to any person, or property, subject to US jurisdiction, when the other conditions are met. It is not limited to utilities. A distribution transformer used only on the local distribution system is outside the bulk-power definition that was read. Location behind the meter, or at a data center, does not by itself decide coverage.

In the European Union, the confirmed funding wording is EU-funded solar, wind and energy storage projects, direct or indirect management, and inverters. A transformer buyer whose contract is only a power transformer should not treat that wording as covering the transformer. A project that also buys inverters and uses EU funds should ask the funder.

Documents buyers may be asked for

EO 14421 and the DOE FAQ do not prescribe a declared-origin form, a domestic-content percentage, or a DOE attestation. No pre-qualification list is open. The request for information asks what records manufacturers, importers, distributors, and purchasers can reasonably provide to show where an article was manufactured, produced, or assembled. Keep, in ordinary purchase files: place of manufacture, production, or assembly; the supplier's statement on ownership or control; whether the unit is a substation transformer or an instrument transformer; facility voltage and whether it is transmission at 69 kV or local distribution; contract, shipment, title, and installation dates; and any software, firmware, or remote-access arrangement. A NERC CIP or IEC certificate is evidence. The FAQ says it is not an exemption.

For the EU inverter funding guidance, no document list was in the texts that were read. For an NZIA Article 28 scheme, the non-binding guidance points to customs declarations and, where needed, invoices, serial numbers, nameplates, certificates of origin, transport documents, bills of material, and suppliers' declarations. That list was not confirmed for power transformers.

Checklist

• Use the official name of the equipment. Do not call an inverter a power transformer, or the reverse.
• Say whether the US facility is bulk-power transmission at 69 kV or more, or local distribution.
• Do not treat a foreign transformer as banned, and do not treat it as cleared, only because it was made outside the United States.
• Record where it was manufactured, produced, or assembled. The order's definition of foreign-produced is an article that is not manufactured, produced, or assembled in the United States. It sets no rule for a US-assembled unit with foreign parts.
• Ask the supplier for a written origin and ownership statement. The order does not set the form.
• If the project uses EU funds, ask whether the unpublished interim guidance applies, and ask for a copy.
• Do not cite the revoked 2020 prohibition order, or the unadopted Cybersecurity Act proposal, as a rule in force.
• Read the Federal Register and EUR-Lex again before award.

Sources

Checked 20 October 2026. The eCFR page for 22 CFR 126.1 is the provision the order names. Its country list was not retrieved that day, so it is not copied here.

1. Executive Order 14421, 91 FR 55995 (31 August 2026)
2. The same order, Federal Register PDF
3. DOE FAQ, updated 6 October 2026
4. DOE request for information, 9 September 2026
5. 22 CFR 126.1, named in the order. List not retrieved on the check date.
6. 2020 prohibition order, later revoked.
7. Revocation, effective 20 April 2021
8. COM(2026) 501 final, 3 June 2026
9. InvestEU Advisory Board minutes, 3 June 2026
10. JOIN(2025) 977 final, 3 December 2025
11. Proposal COM(2026) 11, not in force.
12. NZIA Article 28 guidance, OJ C/2026/123