BEIJING – China’s government Friday rejected a U.S. antidumping ruling against its makers of solar power equipment and Chinese manufacturers warned possible higher tariffs might hurt efforts to promote clean energy.

The governments have pledged to cooperate in developing renewable energy but accuse each other of violating free-trade pledges by subsidizing their own manufacturers.

“The U.S. ruling is unfair, and the Chinese side expresses its extreme dissatisfaction,” Shen Danyang, a Commerce Ministry spokesman, said in a statement.

Shen warned the ruling might harm clean energy cooperation but gave no indication how Beijing might respond. American companies that oppose the trade probe have warned that China might retaliate against U.S. suppliers.