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Investor-owned utilityPSO interconnection application
PSO is an investor-owned utility serving 506,245 residential customers in Oklahoma (EIA-861, 2025). Applications: PowerClerk (AEP PowerClerk). Gridpol files PSO 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 PSO’s official sources (see below). Fee amounts and installer LOA not published.
PSO at a glance
Public Service Co of Oklahoma (American Electric Power)
TypeInvestor-owned utility
EIA utility ID15474
Residential customers506,245 (EIA-861, 2025)
Net-metered residential customers4,653 (EIA-861, 2025)
Service territory46 counties in Oklahoma
How to applyPowerClerk – AEP PowerClerk · official link
Who submitsCustomer starts application in PowerClerk (account registration); page does not name installer submission explicitly. Questions: dgcoordinator_PSO@aep.com.
Export compensationNet billing – Net Energy Billing Option (NEBO), OCC Order 708079
TOD rate; hourly/interval netting; excess credited in dollars at SPP DA LMP-based avoided energy cost; separate production meter
Interconnection Agreement approval within 60 days if requirements met; 'a little more than 60 days' typical for homeowners (Customer Information Packet).
Documents PSO asks for
- Interconnection application formOnline application in PowerClerk, signed, with fees Gridpol prepares this.
- UL 1741 / IEEE 1547 certificationInverter manufacturer proof of UL 1741 testing (expedited review <=25 kW); IEEE 1547-2018 equipment from 1/1/2024
- Interconnection agreementInterconnection Service Agreement / Interconnection Agreement + Standard Electricity Purchase Agreement (NEBO)
- Final inspection sign-offProof of local inspections and testing before energizing
- Other utility-specific documentVisible-break lockable AC disconnect within 10 ft of main meter, 48-66 in above ground; additional meter socket for AMI generation meter
How the PSO process runs
- Submit application in aep.powerclerk.com, pay fees, sign
- PSO technical review / analysis; agree mitigations
- PSO issues Interconnection Service Agreement (+ cost estimate if needed); sign ISA + purchase agreement
- Install with AC disconnect and generation meter socket; local permits/inspections
- Schedule post-installation inspection; PSO installs AMI generation meter
- PSO issues Permission to Operate letter
Fees
| Fee | Applies to | Note |
|---|---|---|
| All | 'Pay any fees' in PowerClerk; amounts not published on page; customer pays system upgrades |
Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.
Size levels and limits
| Level | Up to | Note |
|---|---|---|
| Expedited (automated) review | 25 kW | UL 1741 inverter-based |
| Expanded review | 1000 kW | >1 MW may need additional study |
| Net metering cap | 300 kW |
NEBO: <=300 kW and <=125% of annual peak demand; screened on nameplate kW
Storage, EV and stamps
Battery storage
Energy storage systems go through the same DER interconnection process (Complete Guide covers DG or Energy Storage Systems).
Sources
- PSO – Generating Equipment / Interconnection: https://www.psoklahoma.com/builders/GeneratingEquipment.aspx (retrieved 2026-11-13)
- PSO Complete Guide to Interconnection 2024: https://www.psoklahoma.com/lib/docs/business/builders/PSO-CompleteGuidetoInterconnection2024.pdf (retrieved 2026-11-13)
- PSO DG Customer Information Packet: https://www.psoklahoma.com/lib/docs/business/builders/CustomerInfoPacket-PSO.pdf (retrieved 2026-11-13)
Other utilities in Oklahoma
- OG&E716,295
- Oklahoma Electric Cooperative Inc.59,539
- City of Edmond39,944
- Northeast Oklahoma Electric Company38,163
- Verdigris Valley Electric Cooperative Inc.35,514
- East Central Oklahoma Electric Cooperative Inc.33,788
- Lake Region Electric Cooperative, Inc.25,042
- Canadian Valley Electric Cooperative, Inc.24,981
- CKenergy Electric Cooperative22,775
- Choctaw Electric Cooperative Inc.21,697
$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
Applications are typically submitted within 2 business days after complete documents. Utility review times are set by each utility.