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Municipal utilityCPS Energy interconnection application
CPS Energy is a municipal utility serving 888,946 residential customers in Texas (EIA-861, 2025). Applications: Own online portal (CPS Energy Solar Application Site / DG Review Portal). Gridpol files CPS Energy 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 CPS Energy’s official sources (see below). Net metering/billing credit terms not retrieved; residential step detail in 'Residential Interconnection Process' PDF.
CPS Energy at a glance
City of San Antonio (City of San Antonio)
TypeMunicipal utility
EIA utility ID16604
Residential customers888,946 (EIA-861, 2025)
Net-metered residential customers48,818 (EIA-861, 2025)
Service territory8 counties in Texas
How to applyOwn online portal – CPS Energy Solar Application Site / DG Review Portal · official link
Who submitsRegistered contractor submits on customer's behalf (customer contacts registered solar contractor who manages application). Contractor registration: TDLR electrical contractor license, CGL insurance certificate.
Review time (official)Pre-application review 15 business days (optional); screening 25-60 business days where required; standard review 90 business days (larger systems).
Documents CPS Energy asks for
- Interconnection application formApplication for Interconnection of Distributed Generation (DG Manual App. D); <25 kWac: section 2, signed Gridpol prepares this.
- Single-line diagram (one-line)Detailed operational one-line diagram, to scale, PDF Gridpol prepares this.
- Site plan / site layoutSite plan, to scale Gridpol prepares this.
- Other utility-specific documentMeter loop drawing (elevation)/equipment layout; visible disconnect ratings; protective devices
- PV module spec sheetManufacturer spec sheets for panels and inverters (solar program)
- Photos (meter, main panel, equipment) (when applicable)Photos of existing equipment on wall and profile view (solar program process)
- Proof of insurance (when applicable)>50 kWac: certificate of liability insurance
- Other utility-specific documentSolar Disclosure Form listed in contractor resources
How the CPS Energy process runs
- Customer selects registered contractor
- Contractor submits application + drawings via Solar Application Site/DG Review Portal
- Technical review (screening as needed)
- Interconnection agreement / approval
- Construction, City of San Antonio permit/inspection
- CPS inspection/commissioning
- Permission to Operate / meter
Fees
| Fee | Applies to | Note |
|---|---|---|
| $0 | 1 to <50 kWac | Study fee bracket per DG Manual |
| $500 | 50 kWac to <1 MWac |
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 |
|---|---|---|
| <25 kWac | 25 kW | Simplified application section 2 |
| >=25 kWac | 10000 kW | Sections 3-6; Texas PE sealed drawings |
DG Manual covers <10 MWac
Storage, EV and stamps
Battery storage
Storage in a net-metered installation may not export to grid; may power essential loads during outages. DG Manual (May 2024) being revised for BESS.
PE stamp
>=25 kWac (or Downtown Network): Texas PE sealed one-line and site plan. – PE-stamped drawings are not included in Gridpol.
Sources
- CPS Energy – Distributed Generation Contractors: https://www.cpsenergy.com/en/my-home/savenow/distributed-gen-contractors.html (retrieved 2026-11-13)
- CPS Energy Distributed Generation Manual (May 2024): https://www.cpsenergy.com/content/dam/corporate/en/Documents/Distributed%20Generation%20Manual.pdf (retrieved 2026-11-13)
- CPS Energy – Residential Customer-Owned Solar: https://www.cpsenergy.com/content/corporate/en/my-home/savenow/rooftop-solar-res.html (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.