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Investor-owned utilityAEP Texas (Central Division) interconnection application
AEP Texas (Central Division) is an investor-owned utility serving 793,896 residential customers in Texas (EIA-861, 2025). Applications: PowerClerk (AEP PowerClerk interconnection portal). Gridpol files AEP Texas (Central Division) 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 AEP Texas (Central Division)’s official sources (see below). Central and North are divisions of one company (AEP Texas Inc.) with a single tariff and the same DER process/portal; identical text used. Caution: the AEP Texas Quick Start Guide PDF mentions a 'Net Energy Metering Service (NEMS)' bill credit and a 35-day ISA approval - this conflicts with the AEP Texas solar page (REP decides buyback; 30-day PTO) and appears to be generic AEP text; the solar page/ERCOT structure is used here. Customer Information Packet PDF is image-only (not read). Contact der_aeptexas@aep.com, 361-881-5333.
AEP Texas (Central Division) at a glance
AEP Texas Central Company (American Electric Power (AEP Texas Inc.))
TypeInvestor-owned utility
EIA utility ID3278
Residential customers793,896 (EIA-861, 2025)
Net-metered residential customersnone reported
Service territory44 counties in Texas
How to applyPowerClerk – AEP PowerClerk interconnection portal · official link
Who submitsCustomer or customer's designated representative (installer) applies online after registering a PowerClerk account; application must be signed and fees paid before technical review. Authorized Release of Information list names project manager/electrical contractor/consultant.
Review time (official)AEP Texas solar page: Interconnection Agreement and PTO 30 days or less after receipt of application; meter reprogramming 15 days or less after PTO; load profile update and surplus data to REP 30-60 days after reprogramming. 16 TAC §25.211(m): interconnection within 4 weeks of receipt of a completed application for pre-certified equipment, 6 weeks for other facilities (longer if substantial capital upgrades). §25.211(g)/(i): pre-interconnection studies max 4 weeks.
Documents AEP Texas (Central Division) asks for
- Interconnection application formApplication for Interconnection and Parallel Operation of DG (Tariff 6.3.2 form; ESI ID, kW/kVA, export yes/no, report excess to REP, pre-certification UL 1741/IEEE 1547.1) Gridpol prepares this.
- Single-line diagram (one-line)One-line: all DER equipment (manufacturer, model, units), title block with customer name/address, labeled AC disconnect, existing DER labeled, nameplate kW/V/A/phase; block diagram acceptable if < 25 kW Gridpol prepares this.
- Site plan / site layoutLayout sketch showing lockable, visible disconnect device Gridpol prepares this.
- Other utility-specific document (when applicable)Copy of manufacturer's warranty (initial warranty no less than 5 years) per AEP Texas application form
- Inverter spec sheetIEEE 1547-2018 (or equivalent) certified equipment required since Jan 1, 2024
- Customer signatureSigned application and Interconnection Service Agreement (ISA)
- Interconnection agreementInterconnection Service Agreement after technical analysis
- Final inspection sign-off (when applicable)Proof of local inspections and testing depending on DER nature/size
How the AEP Texas (Central Division) process runs
- Register in PowerClerk and submit interconnection application before installing (signed, fees paid).
- AEP Texas technical review/analysis; mitigations agreed; Interconnection Service Agreement (ISA) and cost estimate if upgrades needed.
- Customer signs ISA and pays for any interconnection equipment.
- Install system with lockable AC disconnect, local permits and inspections.
- Notify AEP Texas; post-installation field verification (meter, placards, disconnects, ingress/egress); proof of local inspection as applicable.
- Permission to Operate letter; meter reprogrammed to measure surplus.
- Surplus data sent to customer's REP; REP decides any buyback credit.
Fees
| Fee | Applies to | Note |
|---|---|---|
| $0 | 0-10 kW pre-certified, not on network (exporting or non-exporting); and any pre-certified ≤500 kW meeting 15%/25% feeder screens | AEP Texas tariff 6.1.2.4 Distributed Generation Charges (tariff dated eff. Nov 6, 2026 TC3; DG section eff. bills on/after Oct 1, 2024) |
| $305 | Exporting 0-10 kW not pre-certified, not on network | Non-exporting: $179 |
| $557 / $1,061 | Exporting 0-10 kW on network (pre-certified / not) | Non-exporting $305 / $557 |
| $602-$2,338 | Exporting 10+ to 500 kW | $602 pre-cert not network, $1,106 non-pre-cert, $1,267 pre-cert network, $2,338 non-pre-cert network (non-exporting $476-$1,267) |
| As calculated | Distributed Generation Meter Installation Fee | When non-standard metering requested |
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 |
|---|---|---|
| 0-10 kW | 10 kW | Fee tier |
| 10+ to 500 kW | 500 kW | Fee tier |
| 500+ to 2000 kW / 2000+ kW | 10000 kW | Fee tier; §25.211 limit 10 MW |
One-line block diagram allowed < 25 kW; PE stamp > 50 kW (AEP TIIR).
Storage, EV and stamps
Battery storage
Battery/energy storage operating in parallel must be reviewed and approved (same application). Backup-only ESS designed to operate only when disconnected from AEP grid does not need an ISA (TIIR). Non-export allowed via reverse power or minimum import protection (TIIR 4.15.2), still requires application. AEP does not support telemetry/schedule-based BESS charging. Single lockable visible-break isolation device for all DER. Make-before-break generators interconnected > 100 ms need approval.
EV chargers
Unidirectional (V1G) EVs operating solely as load are exempt from TIIR/ISA.
PE stamp
One-line diagram signed and stamped by a PE licensed in the state for installations larger than 50 kW (AEP DER TIIR v2.1). – PE-stamped drawings are not included in Gridpol.
Common issues the utility lists
- Equipment not IEEE 1547-2018 certified (from Jan 1, 2024)
- Installation not per TIIR technical specs can cause delays, disconnection and extra costs
- Equipment changes after approval without an updated application
Gridpol’s pre-submission check covers these before we file.
Sources
- AEP Texas - Solar (interconnection, timeline, REP buyback): https://www.aeptexas.com/clean-energy/renewable/solar (retrieved 2026-11-13)
- AEP Texas - Installing Generating Equipment (DER FAQs, PowerClerk): https://www.aeptexas.com/business/builders/generating-equipment (retrieved 2026-11-13)
- AEP Texas Application for Interconnection and Parallel Operation of DG: https://www.aeptexas.com/lib/docs/business/builders/AEPTexasApplication11-7-2019.pdf (retrieved 2026-11-13)
- AEP Texas Quick Start Guide for homeowners: https://www.aeptexas.com/lib/docs/cleanenergy/renewable/solar/QuickStartGuide-AEPTexas.pdf (retrieved 2026-11-13)
- AEP Texas Tariff for Electric Delivery Service (6.1.2.4 DG charges): https://www.aeptexas.com/lib/docs/ratesandtariffs/Texas/AEP_TEXAS_TARIFF_Eff_Nov_6-2026-TC3.pdf (retrieved 2026-11-13)
- AEP DER Technical Interconnection & Interoperability Requirements (TIIR) v2.1, 2026-05: https://docs.aep.com/docs/requiredpostings/DER_TIIR_V_2-1-2026_05.pdf (retrieved 2026-11-13)
- 16 TAC §25.211 Interconnection of On-Site Distributed Generation (LII reprint of Texas Administrative Code; PUCT site puc.texas.gov returns HTTP 403 to this server): https://www.law.cornell.edu/regulations/texas/16-Tex-Admin-Code-SS-25-211 (retrieved 2026-11-13)
$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.