Definition
The amount of transmission transfer capability reserved by a Transmission Provider to ensure reliable operation of the interconnected transmission network under a reasonable range of system uncertainties, such as load forecast errors, generation dispatch deviations, and equipment outages. TRM is held back from commercial use and subtracted from TTC before calculating ATC.
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Topic Deck
Transfer Capability & ATC
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Source
FERC Pro Forma OATT / LGIP
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