The Tennessee Valley Authority board of directors voted to shut down two aging coal-fired power plants, defying a tweet from President Trump on Monday urging the agency to keep one of them open.

The TVA directors voted overwhelmingly to close the Paradise 3 and Bull Run plants. Three of the four people appointed by Trump to the board joined the majority voting to close down the coal units.

"It is not about coal. This decision is about economics," TVA Chief Executive Bill Johnson said.