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 August 28, 2026
Evidence through 2023-08-29 · 0 sources have no source-event date
Content modified 2026-08-28
Definition and decision context
Definition
Anti-islanding protection is the Rule 21 tariff concept addressing an unintentional island, without establishing compliance for any specific device.
Applicable jurisdiction: US-CA
Verified August 28, 2026
Why it matters
SDG&E Rule 21 supplies a smart-inverter settings context for anti-islanding without carrying forward outdated screening thresholds.
Applicable jurisdiction: US-CA
Verified August 28, 2026
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Primary sources
- San Diego Gas & Electric: SDG&E Electric Rule 21 § C Definitions — Anti-Islanding, Sheet 12, Advice Letters 36503-E/4032-E, effective 2023-08-29
Revision 36503-E/4032-E · Source event as of August 29, 2023 · Ontology accessed August 28, 2026 · Ontology verified August 28, 2026
- San Diego Gas & Electric: SDG&E Electric Rule 21 § Hh.1.a(iii), Sheet 132, Advice Letter 37621-E, effective 2023-08-29
Revision 37621-E · Source event as of August 29, 2023 · Ontology accessed August 28, 2026 · Ontology verified August 28, 2026