Defined term
Interconnection study
An interconnection study is a Rule 21 process for evaluating distribution-system impacts, facilities, and upgrades for an interconnection request.
grid · Concept code GS-CONCEPT-201 · Last verified August 28, 2026
Evidence through 2023-08-29 · 1 source has no source-event date
Content modified 2026-08-28
Definition and decision context
Definition
An interconnection study is a Rule 21 process for evaluating distribution-system impacts, facilities, and upgrades for an interconnection request.
Applicable jurisdiction: US-CA
Verified August 28, 2026
Why it matters
A Rule 21 study result can identify later process or upgrade steps, but it is not permission to operate, a final price, or approval.
Applicable jurisdiction: US-CA
Verified August 28, 2026
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Primary sources
- San Diego Gas & Electric: SDG&E Electric Rule 21 § C, Sheet 18, Advice Letter 36509-E, effective 2023-08-29
Revision 36509-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 § G.3.c.i–ii, Sheets 118–119, Advice Letters 36609-E/36610-E
Revision 36609-E/36610-E · Source event date unavailable · Ontology accessed August 28, 2026 · Ontology verified August 28, 2026