The 30 percent duty will undermine the business case for new solar power development in the United States.

In a move that may increase the cost of installing solar panels for American homes and utilities, the US Trade Representative issued new tariffs on imported solar panels late Monday.

The Trump administration ruling is based on recommendations from the US International Trade Commission and adds a 30 percent tariff on solar cells and modules. It kicks in after the first 2.5 gigawatts’ worth of imported capacity and is slated to decline over the next four years.

Monday’s announcement also included tariffs of up to 50 percent for imported washing machines.

US Trade Representative

The ITC made its recommendations in December after determining that China has been subsidizing its solar manufacturers unfairly since 2005, allowing Chinese companies to undercut manufacturers in the United States. This was a big part of why Solyndra, a solar manufacturer that received a $535 million loan guarantee from the Obama administration, went bankrupt. In 2012, the federal government added anti-dumping duties to Chinese solar panels, but manufacturers exploited a loophole that allowed them to bypass the duties by moving final assembly to Taiwan.

When US solar manufacturers tried to get another set of tariffs installed in 2013, Chinese companies moved production to Germany, South Korea, Singapore, and Malaysia.

The side effect of this tariff whack-a-mole was that solar panel prices around the world cratered, leading to a blossoming of solar power. Solar is now the fastest-growing source of new energy, with 86 gigawatts expected to be installed this year worldwide.

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