He's not planning the economy. He's trying to restore a period of history that simply does not work anymore.
Put it this way: brown coal is twice as expensive as solar energy. It costs more money to mine it, and it's less efficient than other, similar energy resources, which means you need to burn more to get the same amount of output. Ignoring the environmental side of things, it's economically inefficient and it will continue to become increasingly inefficient. Common sense dictates that the smart thing to do is to invest in renewables such as solar.
So what does Trump, the brilliant businessman do? He props up the coal industry.
If Trump really was interested in planning the economy, he'd be investing in solar and then providing incentives for coal workers to retrain to work in the industry installing solar panels. The net effect would be to create jobs, provide more disposable income for everyday people as they pay less for their power bills, and develop the technology so that the United States becomes a world leader.
As it is, he's just throwing money at struggling industries and expecting that they will somehow become better.