Tacoma Power (Tacoma Public Utilities) interconnection application

Tacoma Power (Tacoma Public Utilities) is a municipal utility serving 177,554 residential customers in Washington (EIA-861, 2025). Applications: Own online portal (Tacoma Power Solar Application and Interconnection Agreement (DocuSign PowerForm)). Gridpol files Tacoma Power (Tacoma Public Utilities) 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 Tacoma Power (Tacoma Public Utilities)’s official sources (see below). Fees and review timelines not published; current DocuSign form attachment list not visible; verify on first project.

Tacoma Power (Tacoma Public Utilities) at a glance

Utility

City of Tacoma

Type

Municipal utility

EIA utility ID

18429

Residential customers

177,554 (EIA-861, 2025)

Net-metered residential customers

2,960 (EIA-861, 2025)

Service territory

4 counties in Washington

How to apply

Own online portal – Tacoma Power Solar Application and Interconnection Agreement (DocuSign PowerForm) · official link

Who submits

Contractor obtains electrical permit from Tacoma Power and submits the Solar Application and Interconnection Agreement; owner-occupant doing own electrical work may apply for permit directly.

Export compensation

NEM – Net metering (Net Meter Bank)
Excess credited to Net Meter Bank; resets March 31 each year. Advanced meter required; no separate production meter required for new installs; moved to monthly billing.

Documents Tacoma Power (Tacoma Public Utilities) asks for

Interconnection application formSolar Application and Interconnection Agreement (earlier PDF form: Net Metering Application <100 kW, 10-2019) Gridpol prepares this.
Single-line diagram (one-line)One-line schematic showing modules, inverters, production/net meters, lockable visible AC disconnect, storage and other components Gridpol prepares this.
Inverter spec sheetManufacturer cut-sheet showing UL 1741 listing
Customer signatureInterconnection customer signs, agreeing to Net Energy Metering Interconnection Agreement terms
Final inspection sign-offTacoma Power electrical permit (obtained before application) and inspection

How the Tacoma Power (Tacoma Public Utilities) process runs

Choose licensed, bonded, insured contractor
Contractor applies for Tacoma Power electrical permit
Contractor submits Solar Application and Interconnection Agreement with supporting documents
Install to Tacoma Power Electrical Construction Standards and pass inspection
Interconnection to grid / net metering

Size levels and limits

Level	Up to	Note
Net metering	100 kW
Net metering cap	100 kW

Storage, EV and stamps

Battery storage

Storage must be shown on the one-line diagram.

Sources

Tacoma Power Solar: https://www.mytpu.org/community-environment-parks/solar/ (retrieved 2026-11-13)
Tacoma Power Solar and Net Metering FAQs: https://www.mytpu.org/community-environment-parks/solar/solar-and-net-metering-faqs/ (retrieved 2026-11-13)
Tacoma Power Net Metering Application less than 100 kW (10-2019): https://www.mytpu.org/wp-content/uploads/Net-metering-application-less-than-100kW_Oct-19.pdf (retrieved 2026-11-13)

Other utilities in Washington

All Washington 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.