He also told rival Joe Biden "I know more about wind than you do", which was met by bewildered laughter from the Democrat, before the President added "it kills all the birds".
Trump even hinted that he may not believe in carbon emissions.
And Twitter, expectedly, had a field day.
"WTH is he talking about?" wrote one viewer, while others, including satirical news programme The Daily Show, poked fun at the President by posting photos of his famous hair blowing in the wind.
A third person said: "I literally took a 30 second mental break after he said that."
The former Vice President said solar and wind energy is the "fastest growing industry" in the country and accused Trump of supporting conspiracy theories that "wind causes cancer".
Biden, who served as VP for eight years under Barack Obama until 2016, said: "We can grow and we can be cleaner if we go the route I'm proposing."
He added that the solar industry pays "good, prevailing wages" of up to $50 an hour.