Californians gave Donald Trump a stern rebuke Tuesday, handing Hillary Clinton a victory so lopsided that she ended up winning the nationwide popular vote.

Now the multibillion-dollar question is: What does the president-elect have in store for California?

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“There is one vision of the future where we no longer have federal support but are free to do our own thing to create a clean energy economy,” said Michael Wara, a Stanford Law School professor and fellow at the Stanford Woods Institute. “But there is another possibility where the federal government comes in and says there will be only one policy.” Trump has talked of respecting states’ rights, but it is not clear where he would draw the line.

Even if the Republicans don’t try to rewrite federal laws to rein in California’s environmental regulations, Wara said, they could hurt its burgeoning green industry by eliminating tax breaks for the industry or starting trade disputes with China and other East Asian nations that produce ever-cheaper solar cells and batteries that have driven industry growth.