Engineer: Thermophotovoltaic generators are devices that convert heat into electricity  The process of manufacturing steel produces huge amounts of heat that currently go to waste
So if steel-manufacturing plants could feed the heat they produce into thermophotovoltaic generators, they would greatly reduce their electric bills, thereby saving money
Using current technology, it would be possible for steel-manufacturing plants to feed the heat they produce into thermophotovoltaic generators in such a way that those generators could convert at least some of that heat into electricity.