Startup just hit a big milestone for green steel production

Carbon neutral as long as your electricity is carbon neutral.

Also many steel mills are built so that they can switch between energy source, oil, coal, gas, which ever happens to be cheapest currently.

It's a commodity business, price is almost all that matters. And with the current US Administration the days of carbon subsidies might be numbered.

With this approach, a waste heat energy recovery system could reuse a significant percentage of the energy.