Defined term
Ancillary service
FERC says ancillary services help keep the grid stable and resilient by maintaining frequency, reducing voltage fluctuations, helping prevent outages, and responding to sudden changes.
grid · Concept code GS-CONCEPT-213 · Last verified August 28, 2026
Evidence through 2024-01-17 · 1 source has no source-event date
Content modified 2026-08-28
Definition and decision context
Definition
FERC says ancillary services help keep the grid stable and resilient by maintaining frequency, reducing voltage fluctuations, helping prevent outages, and responding to sudden changes.
Applicable jurisdiction: US
Verified August 28, 2026
Why it matters
FERC's ancillary-service categories describe operating roles, not qualification or compensation for an individual device.
Applicable jurisdiction: US
Verified August 28, 2026
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Learning navigation
Primary topic: Grid
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Primary sources
- Federal Energy Regulatory Commission: FERC OPP Ancillary Services, introduction and Ancillary Services Categories, PDF p. 1
Revision current FERC OPP Ancillary Services PDF; event date unavailable · Source event date unavailable · Ontology accessed August 28, 2026 · Ontology verified August 28, 2026
- Federal Energy Regulatory Commission: FERC Energy Markets Primer, January 17, 2024, pp. 57–58 — Ancillary Services
Revision FERC Energy Markets Primer (January 2024) · Source event as of January 17, 2024 · Ontology accessed August 28, 2026 · Ontology verified August 28, 2026