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The decisions ("[[economic dispatch]]") are based on the '''dispatch curve''', where the X-axis constitutes the system power, intervals for the generation units are placed on this axis in the ''[[merit order]]'' with the interval length corresponding to the maximum power of the unit, Y-axis values represent the marginal cost of a [[MWh]] of electricity. For cost-based decisions, the units are ordered per increasing incremental (per-MWh) cost. The graph on the right describes an extremely simplified system, with three committed generator units: (A) can deliver up to 120 MW at the cost of $30 per MWh (from 0 to 120 MW of system power), (B) can deliver up to 80 MW at $60/MWh (from 120 to 200 MW of system power), (C) is capable of 50 MW at $120/MWh (from 200 to 250 MW of system power).<ref name=psu/>
== Minutes-ahead operation ==
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