Blame Canada.

American power producers have been forced to burn more natural gas as smoke from wildfires in Quebec and the Maritimes blocked solar panels and cut renewable output by as much as half.

Power grid operator ISO New England said the smoke was “significantly lowering production from solar resources” in its six-state region. According to its website, about 65% of its demand load was being supplied by gas on Monday morning compared to a long-term average of about 50%.