DART spread

DART is trader shorthand for day-ahead versus real-time. When real time settles above the day-ahead price, buyers who waited paid more than the market predicted. When it settles under, day-ahead carried a premium. Congestion, weather misses, and plant outages drive the spread, and scarcity afternoons can blow it out by hundreds of dollars per megawatt-hour. WattMarkets grades ERCOT's spread daily, by hour and by load zone.

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