Ancillary Services

Ancillary Services

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Definition

Services necessary to support the transmission of electric power from seller to purchaser, given the obligations of control areas and transmission systems to maintain reliable operations of the interconnected transmission system. FERC Order 888 identified six categories of ancillary services: Scheduling/Control/Dispatch, Reactive Supply and Voltage Control, Regulation and Frequency Response, Energy Imbalance, Spinning Reserve, and Supplemental Reserve.

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Topic Deck

Ancillary Services

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Source

FERC Pro Forma OATT / LGIP

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Related Terms in Ancillary Services

Energy Imbalance Service

An ancillary service that corrects for differences between scheduled and actual energy...

Generator Imbalance Service

An ancillary service defined in Schedule 9 of the OATT that corrects for differences...

Operating Reserve – Spinning Reserve Service

An ancillary service consisting of unloaded generating capacity that is synchronized...

Operating Reserve – Supplemental Reserve Service

An ancillary service consisting of generating capacity — either online or offline —...

Reactive Supply and Voltage Control Service

An ancillary service that provides reactive power (VARs) from generating facilities to...

Regulation and Frequency Response Service

An ancillary service that uses Automatic Generation Control (AGC) to match, in...
View all 8 terms in Ancillary Services →