The market for energy for the following day, or more specifically, the market for energy 24 hours in advance of a given time in any day. A day in this context may be more or less than 24 hours. For example, a utility may purchase the next morning's energy in the afternoon (less than 24 hours ahead) or purchase the next afternoon's energy the previous morning (more than 24 hours ahead). Energy producers offer energy on this market based on their ability to produce energy for a specific period on the following day.

See also: