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Day Ahead Energy Market

Forward markets for electricity to be supplied the following day.

Definition by PJM

Source: 1 (p19, Revision 133)

The Day-ahead Energy Market is a forward market in which hourly clearing prices are calculated for each hour of the next operating day based on generation offers, demand bids, increment offers, decrement bids and bilateral transaction schedules submitted into the Day-ahead Energy Market.

A brief graph is given in 2.

Definition by NYISO

Source: 3 (p7, Version 8.0)

Figure 3: Day-Ahead Scheduling Data Flow (from 3)

Figure 3: Day-Ahead Scheduling Data Flow (from 3)

The following figure shows the interaction and data flow between the various functional components that involve the Day-Ahead process. Each of the blocks and major data flows is described after the figure.

Definition by FERC

Forward markets for electricity to be supplied the following day. This market closes with acceptance by the independent system operator, power exchange, or scheduling coordinator of the final day-ahead schedule. Day-ahead is not a term commonly used for natural gas (“next day” is more common).

Last modified: 2025-06-22

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  1. PJM (2024). Manuals M-11: Energy & Ancillary Services Market Operations (Revision 133). https://www.pjm.com/-/media/DotCom/documents/manuals/archive/m11/m11v133-energy-and-ancillary-services-market-operations-12-17-2024.pdf ↩

  2. PJM (2023). Day Ahead Market Clearing Process. https://www.pjm.com/-/media/DotCom/committees-groups/committees/mic/2023/20230717-special/item-02---day-ahead-market-clearing-process.pdf ↩

  3. NYISO (2024). Manual 11: Day-Ahead Scheduling Manual. https://www.nyiso.com/documents/20142/2923301/dayahd-schd-mnl.pdf/0024bc71-4dd9-fa80-a816-f9f3e26ea53a ↩↩↩