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Delaware Electric Cooperative (DEC) interconnection application

Delaware Electric Cooperative (DEC) is an electric cooperative serving 108,801 residential customers in Delaware (EIA-861, 2025). Applications: PDF + email (DEC Interconnection Application (fillable PDF) emailed to interconnection@delaware.coop; fee check by mail to 14198 Sussex Highway, Greenwood, DE 19950). Gridpol files Delaware Electric Cooperative (DEC) 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 Delaware Electric Cooperative (DEC)’s official sources (see below). Portal (email), documents and steps confirmed from DEC application PDFs and solar page (archive 2025-10-09). Gaps: DEC net metering tariff sheet not read (credit terms from FAQ); >=100 kW application not read; current closed-area map status per project.

Delaware Electric Cooperative (DEC) at a glance

Utility

Delaware Electric Cooperative

Type

Electric cooperative

EIA utility ID

5070

Residential customers

108,801 (EIA-861, 2025)

Net-metered residential customers

3,328 (EIA-861, 2025)

Service territory

2 counties in Delaware

How to apply

PDF + email – DEC Interconnection Application (fillable PDF) emailed to interconnection@delaware.coop; fee check by mail to 14198 Sussex Highway, Greenwood, DE 19950 · official link

Who submits

Equipment contractor (installer) prepares and submits with the member; application is signed by DEC member, equipment contractor and electrical contractor (if different). DEC returns approved application to the equipment contractor and member. Leased systems allowed (ownership field).

Export compensation

NEM – DEC net metering (kWh banking) per DEC tariff and 26 Del. C. ch. 10
Excess kWh banked and credited to future bills; banked kWh expire after the March billing period each year (Solar FAQs 2025). Aggregation of multiple accounts possible.

Review time (official)

DEC Technical Requirements (rev. Feb 26, 2024), Level/Tier 1: completeness within 5 business days; safety review within 15 business days after complete; witness test within 10 business days of commissioning (5 business days' notice by applicant) or deemed waived; sign agreement within 30 business days. Preliminary approval valid 180 days (application form).

Wholesale supplier / association

Old Dominion Electric Cooperative · Virginia SCC Regulations Governing Net Energy Metering, 20VAC5-315 (state rule; not published by ODEC)

Documents Delaware Electric Cooperative (DEC) asks for

  • Interconnection application formDEC Interconnection Application - Net Metering (<100 kW DC, rev. May 2024) or Non-Export (<100 kW DC); separate applications for >=100 kW DC. Preliminary part Sections 1-12 + Addendum A; incomplete applications returned without review Gridpol prepares this.
  • Interconnection agreementAddendum A Interconnection Agreement Terms and Conditions, signed by member (application is a binding contract)
  • Customer signatureMember signature (Section 11 + Addendum A)
  • PV module spec sheet (when applicable)Module make/model/qty/rating on form; manufacturer spec sheet may be supplementally included
  • Inverter spec sheet (when applicable)Inverter make/model/qty/rating on form; nameplate/spec sheet may be supplementally included
  • UL 1741 / IEEE 1547 certificationEquipment contractor certifies inverter compliance with IEEE 929 and UL 1741 (Section 9) and can supply documentation
  • Load calculationSizing formula on form: 4.5 sun-hour production vs. 110% of 24-month average usage (12-month or sq.ft. table if less history)
  • Battery spec sheet (when applicable)Battery Storage Interconnection Application supplemental form (rev. Sept 2023) when battery is used
  • Other utility-specific document (when applicable)Aggregate meter list (Section 10) if accounts aggregated
  • Final inspection sign-offFinal portion (Sections 13-14): municipal inspector signature or final inspection certificate, appended as a single PDF

How the Delaware Electric Cooperative (DEC) process runs

  1. Check DEC interconnection map (red = closed, yellow = non-export only) and contact DEC before purchase
  2. Contractor and member complete preliminary application (Sections 1-12 + Addendum A, battery form if any) and email to interconnection@delaware.coop; mail fee check
  3. Any required DEC system upgrade must be requested and paid in full before construction
  4. DEC returns preliminarily approved application (valid 180 days) - do not install before receiving it
  5. Install with lockable disconnect within 3 ft of DEC meter; municipal electrical inspection
  6. Submit final application (Sections 1-14 + Addendum A) with inspection certificate as single PDF
  7. DEC reviews and performs field inspection; deficiencies corrected by contractor
  8. DEC installs net meter and returns approved application - Permission to Operate

Fees

FeeApplies toNote
$50New/upgraded systems <=25 kW DCnon-refundable; check by mail with member name/account in memo
$50 + $1/kW DC over 25 kW>25 kW DC (<100 kW application)
$125Aggregated accounts (any size)
$50Resubmittal of incomplete application / each additional review after multiple revisions

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

Size levels and limits

LevelUp toNote
Tier 110 kWlab-certified inverter-based
Tier 22000 kWcertified/field-approved inverter-based on radial circuit or single-customer spot network
Tier 310000 kWnon-export, no new utility facilities (network: lesser of 5% of max load or 50 kW)
Tier 410000 kWall others <10 MW

System sized so estimated monthly output (inverter kVA x 4.5 h) <= 110% of 24-month average monthly usage; no-history homes 3.8-11.7 kW by sq.ft. Some substations closed to export (red on DEC map); yellow areas non-export only. Separate application forms for <100 kW DC and >=100 kW DC.

Storage, EV and stamps

Battery storage

Battery Storage supplemental form required with the interconnection application: stand-alone vs. with renewable system, shared inverter, whether grid charging is possible and how prevented, battery kW DC/kWh, inverter data (UL listed), frequency-regulation capabilities, intended operation. Non-export application available for areas closed to export.

Common issues the utility lists

  • Application not filled out in its entirety - returned without review ($50 resubmittal fee)
  • No application fee received
  • Location in closed substation area (export not allowed)
  • System output exceeds 110% of average usage
  • Installation deviating from approved design or below DEC standards
  • No acceptable final application within 180 days of preliminary approval (application void)

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

Sources

Other utilities in Delaware

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

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