Defined term
Anti-islanding protection
Anti-islanding protection is the Rule 21 tariff concept addressing an unintentional island, without establishing compliance for any specific device.
grid · Concept code GS-CONCEPT-197 · Last verified September 29, 2026
Evidence through 2023-08-29 · 0 sources have no source-event date
Content modified 2026-09-29
Definition and decision context
Why it matters
SDG&E Rule 21 supplies a smart-inverter settings context for anti-islanding without carrying forward outdated screening thresholds.
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-CA
Verified September 29, 2026
Definition
Anti-islanding protection is the Rule 21 tariff concept addressing an unintentional island, without establishing compliance for any specific 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-CA
Verified September 29, 2026
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Primary topic: Grid
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Primary sources
- San Diego Gas & Electric: SDG&E Electric Rule 21 § Hh.1.a(iii); printed tariff Sheet 132; PDF page 141; Cal. P.U.C. Sheet No. 37621-E; Advice Letter 4280-E; effective 2023-08-29
Revision tariff Sheet132, Cal.PUC37621-E, AL4280-E, submitted2023-08-29, effective2023-08-29 · Source event as of August 29, 2023 · Ontology accessed September 29, 2026 · Ontology verified September 29, 2026
- San Diego Gas & Electric: SDG&E Electric Rule 21 § C Definitions — Anti-Islanding; printed tariff Sheet 12; PDF page 11; Cal. P.U.C. Sheet No. 36503-E; Advice Letter 4032-E; effective 2023-08-29
Revision tariff Sheet12, Cal.PUC36503-E, AL4032-E, submitted2022-07-01, effective2023-08-29 · Source event as of August 29, 2023 · Ontology accessed September 29, 2026 · Ontology verified September 29, 2026