With new tariffs on Mexico and Canada, prices will most likely increase for Californians, economists say. Here's what to know.

As tariffs take effect, farmers fear retaliation from other countries will impede their exports and drive up costs of production.

NEW YORK (Reuters) - Swelling U.S. power prices may rise even faster in some parts of the country if 10% energy tariffs imposed by the Trump administration this week hit Canadian electricity supplies and trigger retaliation, according to energy experts and grid operators.