New solar tariffs take effect December 4 — what they mean for homeowners

What changed

On August 6, 2026, the White House issued a proclamation under Section 232 of the Trade Expansion Act covering polysilicon — the refined silicon at the heart of nearly every solar panel — and the products made from it, including wafers, cells, and finished modules (pv magazine USA, White & Case).

It does two things. First, it adds a 15% tariff on covered imports, with adjusted rates for some trading partners (Norton Rose Fulbright). Second — and this is the bigger change — it sets minimum import prices: a hard floor under what imported solar equipment can be sold for in the U.S. (Wiley).

This follows years of solar trade actions — the previous Section 201 safeguard tariffs expired in February 2026, and separate Section 301 tariffs on Chinese-made components remain in place (Hunton, U.S. Department of Energy overview). A price floor, though, is a new mechanism: rather than taxing cheap imports, it prohibits them from being cheap.

The numbers

The measures take effect December 4, 2026 — 120 days after the proclamation (EY). The minimum import prices:

• Solar modules (finished panels): $0.38 per watt
• Solar cells: $0.22 per watt
• Polysilicon ingots and wafers: $100 per kilogram
• Raw polysilicon: $21 per kilogram
• Plus a 15% Section 232 tariff on covered imports (capped at a combined 15% for the EU, Japan, South Korea, Taiwan, and several others)

What it means for panel prices

The direction is not in much dispute. Industry trade press summarized it plainly: “the price of all imported solar panels is going up” (Solar Power World). The floor is set at roughly U.S. production cost, which means imports lose the price advantage they’ve held for years (pv magazine). U.S. panel prices already run well above the global average, and this locks that gap in.

Perspective matters, though: panels are one part of a system’s total installed cost — racking, inverters, wiring, labor, permitting, and interconnection make up the rest. A shift in panel pricing moves the total, but it doesn’t double it.

What the industry is saying

The action has supporters and critics. Domestic polysilicon manufacturers welcomed it as a foundation for rebuilding U.S. production. The major solar trade groups — including SEIA and the American Clean Power Association — opposed it, warning that price floors on solar materials will raise energy costs for families and businesses and create challenges even for American manufacturers who rely on imported components (industry statement via CleanTechnica).

Both can be true: the policy is designed to help domestic factories, and its near-term effect is higher equipment prices for buyers.

What it doesn’t change

If you already have solar, nothing changes. Tariffs apply to newly imported equipment — not installed systems — and have no effect on your production, your warranties, or your service. State and utility incentives, like Illinois Shines or utility battery programs, are separate policy and are not affected by this action.

What we’d tell a homeowner

Our honest read: in the near term, expect solar equipment prices to keep climbing — the price floor takes effect December 4, and prices are unlikely to ease until more U.S. manufacturing capacity comes online, which takes years, not months. If solar is on your list, running your numbers now, while quotes reflect today’s costs, gives you a cleaner decision.

How much will costs go up? A rough rule of thumb: panels themselves are about 15–20% of what a homeowner pays for a complete installed system — the rest is inverters, racking, wiring, labor, permitting, and interconnection. So even a meaningful jump in module prices moves the total installed price — our ballpark estimate is roughly 4–6% on a typical system. Other components face their own trade pressures, and we’ll update this article as real quotes move.

Either way, the first step is the same as it’s always been: see what your own roof, usage, and utility actually support.

Sources

We back up what we publish — especially on policy. The reporting and analysis behind this article:

pv magazine USA — U.S. announces tariffs, minimum import price on polysilicon imports (Aug 7, 2026)

pv magazine USA — Minimum import prices force foreign solar to match U.S. production costs (Aug 14, 2026)

Solar Power World — The price of all imported solar panels is going up

U.S. solar & storage industry statement on the Section 232 tariffs (via CleanTechnica)

White & Case — President orders tariffs and price floors in polysilicon Section 232 action

Wiley — Section 232 tariffs and minimum import prices on polysilicon and its derivatives

EY — Section 232 proclamation establishes minimum import prices and a 15% tariff

Norton Rose Fulbright — U.S. imposes tariffs and minimum import prices on polysilicon and derivative solar products

Hunton — U.S. imposes new tariffs and minimum import prices on polysilicon and solar products

U.S. Department of Energy — Overview of trade and policy measures for U.S. solar manufacturing