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 September 29, 2026
Evidence through 2024-01-17 · 1 source has no source-event date
Content modified 2026-09-29
Definition and decision context
Why it matters
FERC's ancillary-service categories describe operating roles, not qualification or compensation for an individual device.
Review confirmed · Review due October 29, 2026
The previous review deadline was September 27, 2026. The missed interval remains unverified; the current review does not establish historical coverage.
The cited evidence supports this statement within the source’s stated scope. Its jurisdiction and source-event date limit its applicability to a particular project.
Applicable jurisdiction: US
Verified September 29, 2026
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.
Review confirmed · Review due October 29, 2026
The previous review deadline was September 27, 2026. The missed interval remains unverified; the current review does not establish historical coverage.
The cited evidence supports this statement within the source’s stated scope. Its jurisdiction and source-event date limit its applicability to a particular project.
Applicable jurisdiction: US
Verified September 29, 2026
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Learning navigation
Primary topic: Grid
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Primary sources
- 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 September 29, 2026 · Ontology verified September 29, 2026
- Federal Energy Regulatory Commission: FERC OPP Ancillary Services, introduction and Ancillary Services Categories, PDF p. 1
Source event date unavailable · Ontology accessed September 29, 2026 · Ontology verified September 29, 2026