What is shaping up to be good news for U.S. manufacturers of photovoltaic solar panels, could be bad news for solar installers and homeowners. 

The Commerce Dept. found several Chinese solar-panel companies guilty of dumping and imposed 31% tariffs on their products, the Wall Street Journal reported.

The tariffs will give U.S. panel makers battered by Chinese competition a leg up, but they probably aren’t high enough to drive the Chinese makers out of the business altogether. Critics of the U.S. move said the biggest result may be harm to the overall solar business by raising costs for homeowners or business trying to generate solar power.

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The price of solar panels has plummeted during the past few years, which has been a boon for Hawaii’s solar installers, but it looks like this could change.