Part of our incoming voltage is 15KV and part is 138KV. We routinely move power to the pot lines according to what the market does. Two of our transformers are on the 138KV feed and three of them on the 15KV, two of the four Generators feed our 15KV for the plant, one feeds 138KV and the fourth is a split ownership feeding the 138KV to the grid and us.
We consume about 97 MW per pot line, 300 MW total when all three are running. Our Reversing Mill surges 15 MW when it starts and stops. Very large motor on that mill.
We do a few strange things with our power. Type 1 and Type 2 demand interruptions. If the midwest grid needs power due to a power plant going offline, we can dump a pot line for up to 1 hour and give 100 MW to the grid. We also do a thing called Modulation, basically our tap changers on the transformers are controlled from the grid operators. We vary our amperage from 125,000 amps to 132,000 amps to help distribute load on the grid. Some pretty cool stuff with power around our plant.
And that panel pictured above, had one dance itself right off the wall with the arc flash. That was a 15KV substation panel.
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