I. The Statutory Framework

Under 19 U.S.C. § 1484, every article of merchandise imported into the United States must be formally entered with U.S. Customs and Border Protection. The statute requires the importer of record to file documentation declaring “the value, classification and rate of duty applicable to the merchandise.”¹ This is not a suggestion. It is a legal obligation carrying civil penalties of up to $10,000 per violation under 19 U.S.C. § 1592, or four times the lawful duties owed, whichever is greater.²

The Harmonized Tariff Schedule of the United States (HTS), maintained by the U.S. International Trade Commission under 19 U.S.C. § 1202, classifies every article entering the country and assigns the applicable duty rate.³ The HTS contains 99 chapters, spanning industrial chemicals, live animals, textiles, machinery, and nuclear reactors. Chapter 27, Heading 2716, contains a single entry: “Electrical energy.”⁴

The inclusion of this heading is significant. The HTS does not limit dutiable articles to tangible goods. By classifying energy as a tariff heading, Congress and the International Trade Commission have explicitly recognized that energy entering the United States from a foreign source is an article of import subject to customs jurisdiction. The general duty rate for HTS 2716.00.00 is “Free,” but this rate applies only to electrical energy transmitted through conventional grid interconnections. It does not exempt energy from classification. And as recent legislative action has demonstrated, duty rates can change.⁵

The question is not whether energy can be classified as an import. The HTS already does so. The question is whether all foreign-origin energy entering U.S. territory has been properly classified. It has not.

II. The Foreign Origin

The Sun is located at a mean distance of 92,955,807 miles (149,597,870.7 kilometers) from the Earth, a measurement defined by the International Astronomical Union as one astronomical unit (AU).⁶

For customs purposes, the relevant jurisdictional boundary is considerably closer. Presidential Proclamation 5928, issued on December 27, 1988, established the U.S. territorial sea at 12 nautical miles from the baseline.⁷ The U.S. Exclusive Economic Zone extends 200 nautical miles from shore under Presidential Proclamation 5030.⁸ Even at maximum extent, the outermost boundary of U.S. maritime jurisdiction reaches approximately 230 miles from the coastline.

The Sun is 92,955,577 miles beyond this boundary.

Moreover, Article II of the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, ratified by the United States in 1967, provides that “outer space, including the moon and other celestial bodies, is not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means.”⁹ The Sun is not U.S. territory. It is not any nation’s territory. It is, under binding international law, an unclaimed celestial body.

Any goods originating from the Sun and entering the United States are, by every applicable legal definition, foreign imports.

III. The Goods in Question

The Sun emits electromagnetic radiation across a continuous spectrum, from gamma rays to radio waves. The total power output, known as solar luminosity, is approximately 3.828 × 10²⁶ watts.¹⁰ At the top of Earth’s atmosphere, the flux intercepted per unit area perpendicular to the Sun’s rays is approximately 1,361 watts per square meter, a value known as the solar constant and measured continuously by NASA’s Total and Spectral Solar Irradiance Sensor aboard the International Space Station.¹¹

After atmospheric absorption and scattering, the solar irradiance reaching the Earth’s surface varies by latitude, season, cloud cover, and time of day. The National Renewable Energy Laboratory (NREL) publishes detailed solar resource maps for the United States. The annual average global horizontal irradiance across the contiguous United States ranges from approximately 3.5 kWh/m²/day in the Pacific Northwest to over 6.5 kWh/m²/day in the Desert Southwest, with a national average of approximately 4.5 kWh/m²/day.¹²

The total land area of the United States is 3,796,742 square miles, or approximately 9.834 × 10¹² square meters.¹³ At an average insolation of 4.5 kWh/m²/day, the Sun delivers approximately 4.43 × 10¹³ kWh of energy to U.S. land territory every day. Annually, this amounts to approximately 1.6 × 10¹⁶ kWh, or 16 petawatt-hours.

For context, total U.S. electricity consumption in 2024 was approximately 4,000 terawatt-hours, according to the Energy Information Administration.¹⁴ The Sun delivers roughly 4,000 times more energy to U.S. soil than the nation’s entire electrical grid consumes.

This energy is not inert upon arrival. It drives photosynthesis, which underpins the entire $422.6 billion U.S. agricultural sector.¹⁵ It heats buildings, evaporates water, and powers the hydrological cycle that fills every reservoir in the country. It is, by any functional measure, the single most consequential import in American history.

And it arrives every day without documentation.

IV. The Classification Problem

HTS 2716.00.00 covers “Electrical energy.” Solar radiation is electromagnetic energy, not electrical energy in the conventional sense. A strict reading might suggest that sunlight falls outside Heading 2716.

This would be incorrect under the HTS’s own interpretive rules.

General Rule of Interpretation (GRI) 1 provides that classification is determined by the terms of the headings and any relative section or chapter notes.¹⁶ When a heading does not precisely describe a good, GRI 4 directs that “goods which cannot be classified in accordance with the above rules shall be classified under the heading appropriate to the goods to which they are most akin.”¹⁷

There is no HTS heading for “electromagnetic radiation.” There is no heading for “photons.” The heading most akin to electromagnetic energy is 2716.00.00: electrical energy. Electromagnetic radiation and electrical energy are both manifestations of the electromagnetic force. They are governed by the same set of Maxwell’s equations. A solar cell converts one to the other with efficiencies now exceeding 47 percent in laboratory conditions.¹⁸ The distinction between electromagnetic radiation and electrical energy is a difference of form, not of substance. Under GRI 4, sunlight classifies to Heading 2716.

Alternatively, GRI 3(b) provides that composite goods consisting of different materials shall be classified as if they consisted of the material that gives them their “essential character.”¹⁹ Solar radiation’s essential character is energy. The HTS heading for energy is 2716. The classification is the same either way.

V. The Duty Calculation

The general duty rate for HTS 2716.00.00 is “Free.” Under ordinary circumstances, this would render the analysis academic. But circumstances in 2026 are not ordinary.

On February 24, 2026, the President imposed a 10 percent ad valorem tariff on substantially all imports entering the United States, pursuant to Section 122 of the Trade Act of 1974, 19 U.S.C. § 2132.²⁰ The Section 122 tariff applies to an estimated $1.2 trillion in annual imports across 34 percent of all goods categories. The Tax Foundation estimates the weighted average applied tariff rate while Section 122 is in effect at 10.3 percent.²¹

Section 122 authorizes the President to impose tariffs of up to 15 percent on imports for a period of 150 days to address balance-of-payments emergencies. The statute does not exempt energy. It does not exempt goods classified under Chapter 27. It applies to “articles” imported into the United States, and the HTS classifies energy as an article by virtue of assigning it a tariff heading.

The valuation question is straightforward. Under 19 U.S.C. § 1401a, the customs value of imported merchandise is its “transaction value,” defined as the price actually paid or payable for the goods.²² The Sun charges nothing. This creates a valuation problem.

When goods are imported at no charge, CBP applies the “deductive value” method under § 1401a(d), which uses the resale price of identical or similar merchandise within the United States as a basis for valuation.²³ The resale price of energy in the United States is a matter of public record. The average wholesale price of electricity was approximately $40 per megawatt-hour ($0.04 per kWh) in 2024, according to the Energy Information Administration.²⁴

Applying this valuation to the 1.6 × 10¹⁶ kWh of solar energy reaching U.S. land territory annually yields a customs value of approximately $640 trillion.

At the current Section 122 rate of 10 percent, the annual duty owed is $64 trillion.

The gross national debt of the United States stood at approximately $36.2 trillion as of March 2026, according to the Treasury Department’s Daily Treasury Statement.²⁵

The annual import duty on sunlight, at current tariff rates, is 1.77 times the national debt.

VI. The Country of Origin Problem

Under 19 U.S.C. § 1304, “every article of foreign origin” imported into the United States must be marked with the English name of its country of origin “in a conspicuous place as legibly, indelibly, and permanently as the nature of the article will permit.”²⁶ Implementing regulations at 19 CFR § 134.11 extend this requirement to the “outermost container” in which the article reaches the ultimate purchaser.²⁷

Sunlight arrives without a container. It also arrives without a country of origin. The Outer Space Treaty prohibits national sovereignty claims over celestial bodies. The Sun is not a country. It is not a territory of any country. It is not a free trade zone, a bonded warehouse, or a foreign trade zone as defined under 19 U.S.C. § 81a.

The customs regulations did not contemplate stateless goods originating from celestial objects. The country-of-origin marking requirement contains no exception for goods produced in outer space. No CBP guidance has been issued. No ruling has been requested.

The penalty for failure to mark imported goods with the country of origin is an additional duty of 10 percent ad valorem under 19 U.S.C. § 1304(i).²⁸ Applied to a customs value of $640 trillion, this produces an additional $64 trillion in marking penalties per year, raising the total annual liability to $128 trillion.

VII. The Importer of Record Vacuum

Under 19 U.S.C. § 1484(a)(2)(B), the importer of record is the “owner or purchaser of the merchandise” or a licensed customs broker acting on their behalf.²⁹ Customs entry requires an importer of record. Every shipment entering U.S. territory must have one.

Who is the importer of record for sunlight?

No person or entity has ever claimed ownership of solar radiation in transit. The Sun itself has no legal personhood under U.S. law. It is not registered as a corporation, partnership, sole proprietorship, or nonprofit organization in any U.S. jurisdiction. It holds no Employer Identification Number. It has not designated a customs broker.

The approximately 331.9 million residents of the United States receive solar energy continuously, without having ordered, purchased, or signed for it.³⁰ Under CBP’s regulations, when imported merchandise is not claimed by any party, it is subject to seizure and forfeiture under 19 U.S.C. § 1491.³¹

The government has the statutory authority to seize unclaimed imported merchandise. The Sun delivers unclaimed merchandise to the United States every 8 minutes and 20 seconds (the time required for photons to travel from the solar surface to the Earth).³² No seizure action has ever been initiated.

VIII. The Enforcement Paradox

U.S. Customs and Border Protection processes approximately 37.4 million formal import entries per year.³³ Each entry requires classification, valuation, and duty assessment. The agency employs approximately 65,000 personnel across 328 ports of entry.³⁴

Solar radiation enters the United States across approximately 12,383 miles of land borders, 95,471 miles of coastline, and 3.797 million square miles of land surface, plus an exclusive economic zone of approximately 3.4 million square nautical miles.³⁵ It enters simultaneously at every point. It does not stop at ports of entry. It does not arrive in containers. It does not present documentation. It enters at 186,282 miles per second.

The existing CBP infrastructure was not designed to process an import that arrives everywhere, continuously, at the speed of light.

This does not, however, eliminate the statutory obligation. The Tariff Act does not condition the duty on the government’s ability to collect it. It conditions the duty on the act of importation. The importation occurs 365 days a year, from dawn until dusk, at every point on the national surface. The duty accrues whether or not anyone files an entry. The fact that compliance is physically impossible does not, under the statute’s plain text, create an exemption.

IX. The Solar Panel Irony

The United States currently imposes a tariff on imported solar panels. In January 2018, the President imposed safeguard tariffs on crystalline silicon photovoltaic cells and modules under Section 201 of the Trade Act of 1974. These tariffs, which began at 30 percent and step down annually, were extended through February 2026.³⁶ Additional tariffs apply to solar cells and modules from China under Sections 301 and 232.

The stated purpose of these tariffs is to protect domestic manufacturing from unfairly priced foreign competition. The tariffs apply to the devices that convert sunlight into electricity. They do not apply to the sunlight itself.

Consider the implications. The United States taxes the machinery that processes the import. It does not tax the import. This is the regulatory equivalent of imposing tariffs on oil refineries while allowing crude petroleum to enter the country duty-free and undeclared. It is, from a trade enforcement perspective, precisely backwards.

The solar panel tariffs raised approximately $1.5 billion in revenue in 2024.³⁷ The unpaid duty on the raw material those panels are designed to capture is, as demonstrated in Section V, $64 trillion per year. The United States is collecting approximately 0.002 percent of the available tariff revenue from the solar energy supply chain.

X. The Agricultural Dimension

Photosynthesis is the biochemical process by which plants convert solar electromagnetic radiation into chemical energy in the form of glucose. The reaction requires carbon dioxide, water, and light energy. The light energy is the imported input. The glucose is the finished product.³⁸

Under U.S. customs law, a “substantial transformation” occurs when an imported article is processed into a new and different article with a different name, character, and use. Goods that undergo substantial transformation in the United States are considered U.S.-origin products. But the imported raw material remains subject to duty at the point of entry.³⁹

Every farm in the United States is, under this framework, a manufacturing facility that imports foreign-origin raw materials (solar electromagnetic radiation), subjects them to a substantial transformation (photosynthesis), and sells the finished product (crops) in domestic commerce. The USDA reports 2.04 million farms operating on 893 million acres of land.⁴⁰ Not one has ever filed a customs entry for its primary energy input.

The agricultural sector’s total output was $422.6 billion in 2023.⁴¹ Every dollar of that output traces its energy provenance to an undeclared foreign import.

XI. Conclusion

The Harmonized Tariff Schedule classifies energy as a dutiable article. The Sun is a foreign-origin source of energy. It exports approximately 16 petawatt-hours of electromagnetic energy to U.S. territory annually, with a deductive customs value of $640 trillion. At the current Section 122 tariff rate of 10 percent, the annual duty is $64 trillion. The country-of-origin marking penalty adds another $64 trillion. The total annual liability is $128 trillion, or approximately 3.5 times the national debt.

No customs entry has been filed. No duty has been assessed. No marking penalty has been imposed. No importer of record has been identified. The Sun has operated as the largest unregistered exporter to the United States for the entirety of the nation’s 250-year history. The cumulative unpaid duties, even at the historically low average tariff rate of 1.5 percent, exceed any figure that conventional accounting is equipped to express.

The statute is clear. The classification is defensible. The valuation is based on published federal data. The enforcement gap is not a matter of ambiguity. It is a matter of scale.

Ergo.