By John Young

With grimy smokestacks belching out what smokestacks do, the Southern Colorado town of Pueblo used to be known as Steel City.

Now it can be known as Solar City.

The town’s signature steel plant -— once powered entirely by coal — is soon to be almost entirely solar-powered.

The juice — 90 percent of what the plant requires — will come from 75,000 solar panels across 1,800 acres.

 This is a retrofit that is fit for a nation that needs an energy makeover.

The ...