Embodiments of the present disclosure provide an apparatus including: a controller communicatively coupled to a power generation system and configured to shift the power generation system between a first operating mode and a second operating mode, the second operating mode being different from the first operating mode; and a economic optimization engine in communication with the controller, wherein the economic optimization engine calculates: an economic benefit for shifting the power generation system from the first operating mode to the second operating mode based on at least one of a power generation demand, a power generation cost, and an operating condition of the power generation system; and a billing rate per unit of time of operation in the second operating mode based on at least one of the economic benefit, an operating difference between the first operating mode and the second operating mode, and a predetermined cost differential.