Installations of new solar power capacity in the U.S. slowed in the third quarter to their weakest rate since 2015, hit by the Trump administration’s tariffs on imported panels.

The cost of solar power has plunged over the past decade, making it highly competitive against fossil fuel generation in many parts of the U.S., and it also often benefits from state mandates. But the pace of development has been dependent on federal government policy, including a tax credit on investment and tariffs on imported panels, which dominate the U.S. market.

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