The Obama administration says China is dumping solar panels into U.S. markets.

The Commerce Department said Thursday it plans to impose tariffs as high as 31 percent on Chinese exporters. This would be on top of previous tariffs because of what the United States calls unfair Chinese government subsidies for solar power equipment.

U.S. officials say when China floods the market with government-subsidized solar panels, it makes U.S. built panels too expensive.