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Here is an interesting little article from Popular Science May 2004, on operating a small carbon arc furnace for melting small amounts of high temp. metals.
In the second last paragraph the writer states the minimill industrial melter draws 100 megawatts. Many years ago I worked at a small co-gen plant supplying power to the grid and low press steam to a Domtar dimension lumber mill. The co-gen was rated 7.5 megawatts ( it only ever ran flat out when I was operating, the ego kicking in, lol). Those 7.5 megawatts were enough to power a small town of 1500 people, all the services, and the Domtar saw mill and drying kilns. So how much can 100 megawatts power, a small city of 30 or 40 thousand, or 1 mini industrial carbon arc mill, wow.