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Investor-owned utility

ComEd interconnection application

ComEd is an investor-owned utility serving 3,753,924 residential customers in Illinois (EIA-861, 2025). Applications: Own online portal (ComEd interconnection portal). Gridpol files ComEd 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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Process verified from ComEd’s official sources (see below). Level 1 review day counts (Part 466) not extracted from ComEd Appendix 1; confirm on first project.

ComEd at a glance

Utility

Commonwealth Edison Co (Exelon)

Type

Investor-owned utility

EIA utility ID

4110

Residential customers

3,753,924 (EIA-861, 2025)

Net-metered residential customers

73,159 (EIA-861, 2025)

Service territory

24 counties in Illinois

How to apply

Own online portal – ComEd interconnection portal · official link

Who submits

Interconnection Customer (customer) or installer; ComEd states installers normally file but customers may apply themselves. Combined interconnection + net metering application possible (select level, then 'net metering' as intent of generation). Mail alternative: ComEd Interconnection Services, 2 Lincoln Center 9th Floor, Oakbrook Terrace IL 60181 (check/money order).

Export compensation

Net billing – Rider NM - Net Metering (CEJA)
Systems with PTO on/after 1 Jan 2025 net only the Supply portion (kWh or monetary credit, non-expiring); legacy pre-2025 systems keep full retail. DG rebate $250-300/kW for smart-inverter systems (separate).

Review time (official)

Per Part 466 and ComEd Appendix 1 timeline (not extracted); pre-application report within 20 business days. Initial completeness screen then technical review.

Documents ComEd asks for

  • Interconnection application formIllinois Standard DG Interconnection Level 1 (or 2-4) application, online preferred Gridpol prepares this.
  • Single-line diagram (one-line)One-line diagram; PE stamp NOT required for Level 1/Level 2 < 1 MW Gridpol prepares this.
  • Site plan / site layoutSite plan with POI and array layout Gridpol prepares this.
  • PV module spec sheetEquipment data sheets
  • Inverter spec sheetEquipment data sheets; lab-certified (UL 1741) for Level 1
  • Other utility-specific document (when applicable)Manufacturer derate letter + supplemental nameplate label if inverter configured below nameplate (Part 466.75(c)(5)); proposed export-control settings for limited/non-export systems
  • Other utility-specific document (when applicable)Proof of site control (deed, lease, tax bill) if applicant is not current ComEd customer at site
  • Photos (meter, main panel, equipment)Photos of inverter nameplates after installation (for Certificate of Completion)
  • Final inspection sign-offProof of electrical inspection from AHJ
  • Other utility-specific document (when applicable)As-built drawings if changed
  • Net metering / net billing agreement (when applicable)Net metering application (online or NetMeteringApplication.pdf)

How the ComEd process runs

  1. Optional pre-application report ($300)
  2. Submit interconnection (+ net metering) application with fee at interconnect.comed.com
  3. Completeness screen, then technical review (Level 1 screens)
  4. Approval / interconnection agreement (Level 1 standard terms); pay any upgrade costs
  5. Install; contractor tests; AHJ electrical inspection
  6. Upload inverter nameplate photos, AHJ inspection proof, as-built drawings; witness test if required
  7. Customer and ComEd sign 'Approval for Operation of Generating Facility in Parallel' (Certificate of Completion) = PTO; net metering begins. Energizing before PTO leads to disconnection.

Fees

FeeApplies toNote
$50Level 1 (export ≤25 kW, nameplate ≤50 kW, lab-certified inverter)Review does not start until fee paid
$100 + $1/kVALevel 2 (up to 5 MW dep. on line voltage)
$500 + $2/kVALevel 3 (non-export)
$1,000 + $2/kVALevel 4 (≤10 MVA)
$300Optional pre-application reportnon-binding

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

Size levels and limits

LevelUp toNote
Level 125 kWexport capacity ≤25 kW and nameplate ≤50 kW, lab-certified inverter
Level 25000 kWdependent on line voltage, Part 466.80(b)
Level 3non-exporting
Level 410000 kW≤10 MVA

Illinois rules 83 Ill. Adm. Code Part 466 (≤10 MVA)

Storage, EV and stamps

Battery storage

ESS is an eligible DER and goes through the same levels. Level 1 is based on export capacity (≤25 kW) with nameplate ≤50 kW, so storage that is limited-export/non-export can stay in Level 1. Export controls per Part 466.75(c); limited-export inverter systems must use advanced inverter modes/settings specified by ComEd; proposed control settings required before evaluation; may be field-verified/witness-tested. DG rebate also available for storage (smart inverter required).

PE stamp

Not required for Level 1 or Level 2 < 1.0 MW unless required by Illinois Professional Engineering Act; larger (Community Supply/C&I) applications need Illinois PE-stamped one-line, three-line, relay schematics and settings. – PE-stamped drawings are not included in Gridpol.

Common issues the utility lists

  • Application received without fee is not reviewed
  • Incomplete or inconsistent application package (data must match across documents)
  • Missing proposed control/protection settings for systems operated below nameplate
  • Missing manufacturer derate letter for derated inverters

Gridpol’s pre-submission check covers these before we file.

Sources

Other utilities in Illinois

All Illinois 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