U.S. rules foreign solar panels hurt domestic producers, opening door for tariffs that may raise costs.

The U.S. International Trade Commission has decided that domestic solar panel makers were harmed by cheap imports from Cambodia, Malaysia, Thailand, and Vietnam. This ruling paves the way for high tariffs on solar products from these countries, potentially raising costs for American companies and affecting the solar industry's growth. While U.S. solar manufacturers see this as a win, industry groups warn that it could complicate efforts to boost domestic manufacturing and make solar energy more expensive.