Price-inflexible demand is energy purchased on a power exchange (PX) or POOLCO which doesn't have a maximum price. These bids insure that the buyer gets needed energy regardless of availability, and the price paid is usually the highest current price for energy at the time the bid is answered at auction.

Price-flexible demand is energy purchased with a bid that includes a maximum price that the customer is willing to pay. A demand bid is a bit for price-flexible demand.

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