Jan Willem van der Werff is reeling from his queasy ride on the 'solar coaster.'

That's the insider nickname for the solar energy industry, which--while surging--remains vulnerable to the whims of policy and trade. Van der Werff is CEO of Ecolibrium Solar (No. 443 on the 2017 Inc. 500), a $27.2 million maker of hardware that connects sunlight-absorbing panels to roofs. In 2015, companies like his, which had packed their production schedules to take advantage of an expiring tax credit, found their timelines completely upended when Congress unexpectedly extended that credit by five years.

Then came President Trump's swerve from renewables toward coal. Another worry is the new admini­stration's attitude about the kinds of previously unsuccessful trade cases filed by domestic panel producers against low-cost foreign competitors. Tariffs could make solar a more expensive option. "You are starting to see speculative behavior," says van der Werff. "People hoard panels [because] maybe the prices are going to go up--which also means that if no tariffs are imposed, you'll see a glut of panels by the end of this year."

In other words, even good news can be bad news for a company like Ecolibrium, which, despite the industry tumult, has racked up a three-year growth rate of 988.7 percent. Such "short-term waves created by uncertainty make it really difficult to plan," as van der Werff says.

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