Definition
The difference between the day-ahead locational marginal price and the real-time locational marginal price at the same pricing node: DART = DA LMP − RT LMP. The DART spread is the fundamental measure of profitability for virtual traders. A positive DART (DA > RT) favors INC traders; a negative DART (RT > DA) favors DEC traders. Persistent DART patterns can signal market inefficiencies, congestion, or under-scheduling of load, and are closely monitored by market monitors at RTOs/ISOs and FERC.
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Topic Deck
Markets & Pricing
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Source
FERC Pro Forma OATT / LGIP