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 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
A Rule 21 interconnection facilities study identifies required facilities, their cost, and the time required to interconnect. Rule 21 separately requires an executed interconnection agreement and express written utility permission before parallel operation.
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
An interconnection study is a Rule 21 process for evaluating distribution-system impacts, facilities, and upgrades for an interconnection request.
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 sources
- San Diego Gas & Electric: SDG&E Electric Rule 21 § C; printed tariff Sheet 18; PDF page 17; Cal. P.U.C. Sheet No. 36509-E; Advice Letter 4032-E; effective 2023-08-29
Revision tariff Sheet18, Cal.PUC36509-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