How do tariffs affect energy prices and trade?

A tariff is a tax charged when goods cross a border. When the goods are energy hardware like solar cells and modules, the tax raises the cost of bringing them in, which can change where equipment is made, who builds projects, and what buyers eventually pay for power. How much it matters depends on how the tariff is designed, how many layers are stacked together, and how it is collected.

Key Points

• A tariff is often charged as a percentage of the goods' price, which the WTO calls an "ad valorem" tariff. Some are instead set as a fixed amount per unit or per watt.
• Several separate U.S. legal authorities can apply to the same product at once, including antidumping and countervailing duties and Sections 201, 301, 122 and 232.
• The Department of Energy describes the solar supply chain as global but dominated by products from China or companies with close ties to China, so tariffs aimed at one country often reshape trade elsewhere.
• A tariff percentage applies to the imported item, not automatically to the full installed price of a solar system.
• Tariff design affects project costs and, through them, the price of electricity sold under long-term contracts.

Understanding Tariffs on Energy Equipment

Every traded product is classified in a tariff schedule. The WTO says products in tariff databases are identified using the World Customs Organization's "Harmonized System," and that the codes are standard up to six digits. Beyond six digits, the WTO says, countries are free to use their own definitions. That is why a rule can be written narrowly around a particular kind of cell or module.

The rate attached to a product starts with a country's normal tariff. The WTO defines the most-favoured-nation (MFN) tariff as the normal non-discriminatory tariff charged on imports, excluding preferential tariffs under free trade agreements and tariffs charged inside quotas. It also separates "bound rates," which are legally bound ceilings on what a member government can set, from "applied rates," which are what governments actually charge and which can be lower. Once a rate is bound, the WTO says, it may not be raised without compensating the affected parties.

On top of the normal rate, governments can add duties for specific purposes. In the United States, the Department of Energy describes three broad families. Antidumping and countervailing duties (AD/CVD) are collected by U.S. Customs and Border Protection (CBP) after the Department of Commerce determines goods were sold unfairly. Section 201 tariffs are meant to give domestic industries time to become competitive. Section 301 tariffs target goods that violate trade agreements or benefit from unfair trade practices.

How It Works

1. Classification and rate-setting: An importer declares the product's code and value. The normal MFN rate applies, and any additional duties tied to the product or its country of origin are layered on top. AD/CVD rates are set by Commerce and, the Department of Energy says, can vary by year and by company.

2. Collection at the border: CBP collects the money when goods enter. For AD/CVD, the U.S. Government Accountability Office (GAO) explains that the system sets an initial estimated rate at entry, followed by a retrospective assessment of a final rate based on the actual amount of dumping or subsidization. Collection is not always complete. GAO reported that over $20 billion of AD/CV duties billed in fiscal years 2001-2018 were collected, but $4.5 billion remained uncollected as of May 2019.

3. Different legal triggers: Dumping, the Department of Energy says, happens when a foreign company sells a product in the United States below its production costs. A "countervailable subsidy" is financial assistance from a foreign government that is deemed unfair. Energea, a solar developer, notes that a Section 201 action does not require a finding that a specific country dumped or subsidized goods, unlike AD/CVD cases.

4. Minimum-price designs: Newer tools can work differently from a flat percentage. Energea, relaying the August 6, 2026 White House Section 232 proclamation, lists minimum import prices of $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, $0.22 per watt for cells and $0.38 per watt for modules, applying to entries from December 4, 2026. Energea says that under this design, if the entered value is below the minimum and documentation is submitted, CBP assesses a specific tariff equal to the difference. In effect the duty fills the gap up to a price floor, rather than taxing whatever price was declared.

5. Supply chains respond: Producers and importers adjust to the duties. The Energy Information Administration (EIA) says antidumping tariffs on solar products from China and Taiwan in 2012 and 2014 led some manufacturers there to outsource production to countries not covered by the duties. The Department of Energy says Commerce found in 2023 that some companies in Vietnam, Malaysia, Thailand and Cambodia were circumventing the AD/CVD on Chinese c-Si solar modules and cells, and that products from those four countries are deemed to be circumventing if they use Chinese wafers and more than two other Chinese-made components.

Why It Matters

Tariffs matter most where a supply chain is concentrated. The Department of Energy describes the crystalline silicon chain as polysilicon melted into ingots, sliced into wafers, made into cells, and assembled into modules with glass, plastic and aluminum framing. Energea, citing the International Energy Agency, says China accounts for more than 80% of global solar module manufacturing capacity and about 95% of wafer capacity. When one country dominates upstream steps, a tariff on its goods is hard to avoid by switching suppliers. Rerouting through third countries can also bring new trade cases, as the circumvention findings show.

Design shapes who bears the cost. The U.S. Trade Representative said it announced on January 23, 2018 that the President had approved safeguard tariffs on imported solar cells and modules. The EIA says those tariffs were set to remain effective for four years, with a 30% duty in the first year and a decrease of five percentage points each year. The EIA noted that earlier AD/CVD duties targeted specific countries, while the 2018 safeguard tariffs affect nearly all major sources of PV imports. The U.S. Trade Representative said President Biden announced an extension and modification on February 4, 2022. The Department of Energy says the first 12.5 GW of cells imported annually are exempt from Section 201 tariffs so they can be used to assemble panels domestically. Exemptions like this show that tariffs can be built to protect one stage of manufacturing while sparing another. Energea says the Section 201 safeguard terminated on February 6, 2026. It also says Section 301 duties on Chinese solar cells have been 50% since September 27, 2024, and those on Chinese wafers and polysilicon rose to 50% on January 1, 2025.

Cost effects reach electricity prices only indirectly. Energea gives a simple example: a 10% duty on a $0.30-per-watt module adds $0.03 per watt before other duties and costs. It adds that tariff percentages apply to covered imports, not automatically to the full installed-system price. The EIA, citing National Renewable Energy Laboratory estimates, said the module portion of total installed costs in 2016 ranged from 22% for residential systems to 45% for fixed-axis utility-scale systems. Energea, relaying a Roth Capital scenario reported by pv magazine, says each $0.10-per-watt module cost increase could add roughly $4.00 to $5.50 per megawatt-hour to power purchase agreement prices. Energea calls these scenario estimates rather than a universal forecast.

Legal footing can change quickly. Energea says a temporary 10% Section 122 surcharge took effect February 24 and expired July 24, 2026, after its statutory 150-day period, following a Supreme Court holding that IEEPA did not authorize the 2025 tariff actions. Importers and developers therefore have to plan around authorities that start, lapse and get replaced.

Related Terms

• Ad valorem tariff: A duty charged as a percentage of the price of imported goods.
• Bound and applied rates: A bound rate is the legal ceiling a WTO member has committed to. The applied rate is what it actually charges, and it can be lower.
• Antidumping and countervailing duties: Fees on imports that Commerce finds were sold unfairly or benefited from unfair foreign subsidies.
• Minimum import price: A price floor under which CBP assesses a specific tariff equal to the difference between the entered value and the minimum.

Frequently Asked Questions

Do tariffs raise the price of solar panels?

They add to the cost of imported covered products, and the size of the effect depends on the rate and design. Energea's example is that a 10% duty on a $0.30-per-watt module adds $0.03 per watt before other duties and costs. Other factors, such as where equipment is sourced and how much the module accounts for in the total project cost, determine what reaches buyers.

Why do tariffs move manufacturing to other countries?

A duty aimed at one country gives producers a reason to shift assembly or production elsewhere. The EIA says the antidumping tariffs on China and Taiwan in 2012 and 2014 led some manufacturers there to outsource production to countries not covered. Regulators have since written rules to catch some of that rerouting, as the Department of Energy's account of the circumvention findings shows.

Are solar imports and installations measured in the same units?

Not always. The EIA cautions that AC capacity values are typically 10% to 30% lower than DC values because of conversion losses, so import and installation figures should be compared on the same basis.

Last updated: October 8, 2026. For the latest energy news and analysis, visit stakeandpaper.com.