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Investor-owned utility

SDG&E interconnection application

SDG&E is an investor-owned utility serving 1,378,465 residential customers in California (EIA-861, 2025). Applications: Own online portal (Distribution Interconnection Information System (DIIS)). Gridpol files SDG&E interconnection applications for licensed installers – solar, storage and EV chargers – with single-line diagram and site plan, unlimited for $500 a month.

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Partly researched from official sources. verify on first project: sdge.com blocks this server (Cloudflare 403); content taken from search excerpts of official SDG&E pages. Confirm DIIS URL, full document checklist, NBT application fee, timelines. Contact netmetering@sdge.com / 858-636-5585.

SDG&E at a glance

Utility

San Diego Gas & Electric Co (Sempra)

Type

Investor-owned utility

EIA utility ID

16609

Residential customers

1,378,465 (EIA-861, 2025)

Net-metered residential customers

340,500 (EIA-861, 2025)

Service territory

2 counties in California

How to apply

Own online portal – Distribution Interconnection Information System (DIIS)

Who submits

Customer or their contractor submits through DIIS.

Export compensation

Net billing – Net Billing Tariff (Solar Billing Plan)
CPUC D.22-12-056; applications since 15 Apr 2023

Documents SDG&E asks for

  • Interconnection application formDIIS online interconnection application Gridpol prepares this.
  • Single-line diagram (one-line)One-line diagram (SDG&E templates by size) Gridpol prepares this.
  • Photos (meter, main panel, equipment) (when applicable)Fast Track: clear photo of electric meter and warning ('Caution') plaque in same frame; photo of station/pole number
  • Customer signatureCA solar consumer protection documents (statewide CPUC requirement for residential)
  • Final inspection sign-offFinal building/electrical inspection from AHJ

How the SDG&E process runs

  1. Contractor/customer submits interconnection application in DIIS
  2. SDG&E review (Fast Track if eligible)
  3. Install, pass AHJ inspection, upload final
  4. Sign interconnection agreement
  5. SDG&E grants Permission to Operate

Fees

FeeApplies toNote
$800Rule 21 (non-NEM/NBT) Interconnection Request FeePer SDG&E Electric Rule 21 page; NEM/NBT fee for ≤30 kW not confirmed

Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.

Size levels and limits

LevelUp toNote
NEM/NBT ≤30 kW30 kW
NEM >30 kW1000 kWSeparate 'Apply for NEM - greater than 30kW' process
Net metering cap1000 kW

Sources

California interconnection rule

Rule 21 tariff PDFs not read in full (PG&E file too large, SDG&E host unreachable): insurance, disconnect, NEM/NBT fee and document list unverified; documents list is typical, confirm in tariff Section E. NBT cap 1 MW per PU Code 2827 eligibility - confirm.

Commission

California Public Utilities Commission (CPUC)

Interconnection rule

CPUC Electric Tariff Rule 21 (utility-filed, CPUC-approved); D.20-09-035 timelines; current rulemaking R.25-08-004 – Rule 21 - Generating Facility Interconnections · source

Applies to

CPUC-jurisdictional IOUs: PG&E, SCE, SDG&E, Bear Valley Electric, Liberty Utilities (CalPeco); PacifiCorp uses OATT-based process under D.07-07-027. Not munis/POUs (LADWP, SMUD, IID etc.). Wholesale-market facilities go under WDT/CAISO.

Application form

Utility-specific Rule 21 interconnection request forms filed with CPUC (e.g. SCE Form 14-957 for NEM/NBT, 14-732 non-export); submitted via each IOU's online portal.

Timelines

Initial Review 15 BD; Supplemental Review 20 BD; draft interconnection agreement or cost estimate within 15 BD after review; D.20-09-035 requires tracking of 19 timelines and standard construction/meter timelines.

Fees

$800 interconnection request fee; $2,500 supplemental review (SCE page). NEM-2/NBT <=1 MW historically exempt from study costs; NEM/NBT request fee amount is utility-specific (not verified here).

Export compensation

Net billing – Pub. Util. Code §2827.1; CPUC D.22-12-056 (Net Billing Tariff, 'Solar Billing Plan'); Res. E-5301
NBT applies to IOU applications submitted on/after 2023-04-15; exports credited at avoided-cost-based values; required TOU rates (E-ELEC, TOU-D-PRIME, EV-TOU-5); 9-year legacy. Earlier NEM 1.0/2.0 grandfathered.

Not bound by the rule

Publicly owned utilities are not under Rule 21 and set their own interconnection rules; PU Code §2827 net metering obligations applied to POUs until their 5% cap; POUs now offer own successor tariffs.

Other utilities in California

All California utilities →

Gridpol Unlimited

$500 / month

Unlimited interconnection applications. 12-month agreement, signed online. The agreement starts the day you sign; first invoice right away, then monthly.

  • Unlimited interconnection applications
  • Single-line diagram and site plan for every application
  • Pre-submission check against the utility’s requirements
  • Homeowner e-signature link for the authorization
  • Filing in your utility portal accounts or by the utility’s method
  • Utility questions, corrections and resubmissions
  • Follow-up through approval, inspection and PTO
  • Customer list, exports, API and webhooks
Get started

Applications are typically submitted within 2 business days after complete documents. Utility review times are set by each utility.

Get started – $500/month unlimited