UniSource Energy Services interconnection application

UniSource Energy Services is an investor-owned utility serving 95,288 residential customers in Arizona (EIA-861, 2025). Applications: PowerClerk (UniSource Energy Services PowerClerk). Gridpol files UniSource Energy Services 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 UniSource Energy Services’s official sources (see below). Fees and review timelines not stated on page.

UniSource Energy Services at a glance

Utility

UNS Electric, Inc (UNS Energy (Fortis))

Type

Investor-owned utility

EIA utility ID

19728

Residential customers

95,288 (EIA-861, 2025)

Net-metered residential customers

11,315 (EIA-861, 2025)

Service territory

2 counties in Arizona

How to apply

PowerClerk – UniSource Energy Services PowerClerk · official link

Who submits

Solar installers must submit on customer's behalf via PowerClerk (installer login only; New Installer Packet to renewables@ address). Customer signs Interconnection Agreement.

Export compensation

Net billing – Resource Comparison Proxy (RCP) export rate
Rate locked at application date (resets annually 1 Oct) for 20-year term; TOU or Demand TOU plan required.

Documents UniSource Energy Services asks for

Interconnection application formInterconnection Application in PowerClerk with drawings (DG Drawing Checklist) Gridpol prepares this.
Interconnection agreementCustomer signs; Level 1 via DocuSign, Level 2/3 by e-sign/email
Photos (meter, main panel, equipment)As-built photos after installation
Other utility-specific documentNotice of (Installation) Completion / Installer System Commissioning Form
Other utility-specific document (when applicable)Modification Request Form for major changes; Landlord Authorization; Meter Socket Adapter Signature Form
Final inspection sign-offInstaller secures permits, inspections and clearances

How the UniSource Energy Services process runs

Installer submits application in PowerClerk
Utility Renewables review and approval (no construction before approval)
Customer signs Interconnection Agreement
Installer obtains permits/inspections; schedule power kill in PowerClerk if needed
Submit completion notice/commissioning form + photos
Utility sets production/billing meter and leaves door hanger granting PTO

Size levels and limits

Level	Up to	Note
Level 1	20 kW	≤20 kWac
Level 2/3		>20 kWac

Storage, EV and stamps

Battery storage

Battery systems per SR-710 Distributed Energy Storage Systems (single-phase).

Common issues the utility lists

Missing material kit components -> meter set rejection
Construction before approval
More than one DG meter socket
Major modification without approved Modification Request
Wrong installation type (expansions must be flagged)
No electrical inspection release for power kill
Site access issues / electrician absent at power kill
Missing #1 label on main service disconnect

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

Sources

UniSource Residential Interconnection Application Process: https://www.uesaz.com/residential-interconnection/ (retrieved 2026-11-13)

Other utilities in Arizona

All Arizona 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.