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This strategy offers your plant’s ouput for high price, meaing, it will only run if the power it produces can be sold for high price. Ideal, if you inputs are running low.
You basically want to reserve your scarse input for the moment when it can be turned into expensive energy and not use it up otherwise.
Balanced
Most of your plants output is offered for mid price ranges, while putting some output at both low and high. Increasing probability that the plant will run at least with low output, while still being able to push spot price up.