City of Heyburn interconnection application

City of Heyburn is a municipal utility serving 1,719 customers in Idaho (EIA-861, 2025). Gridpol files City of Heyburn 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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Idaho’s commission rule (No statewide small-generator interconnection rule found; utility-specific IPUC-approved tariffs (e.g., Idaho Power Schedule 68 'Interconnections to Customer Distributed Energy Resources', approved per Order No. 36892, eff. 2026-01-01)) does not bind municipal utilitys; City of Heyburn sets its own interconnection policy. We confirm its form on the first project. Municipal utilities and electric cooperatives are not rate-regulated by the IPUC and set their own interconnection and net metering policies.

City of Heyburn at a glance

Utility

City of Heyburn

Type

Municipal utility

EIA utility ID

8532

Customers

1,719 (EIA-861, 2025, short form: all customer classes)

Net-metered residential customers

none reported

Service territory

1 county in Idaho

Documents City of Heyburn asks for

Interconnection application formFilled in by us from your project data in the utility’s portal or on its form. Gridpol prepares this.
Single-line diagram (one-line)Drawn by us from your equipment data: modules, strings, inverter, battery, disconnects, point of interconnection, meter. Gridpol prepares this.
Site plan / site layoutDrawn by us from your roof sketch or photos: array, inverter, battery, disconnect, meter and main panel locations. Gridpol prepares this.
PV module spec sheetManufacturer data sheet of the modules.
Inverter spec sheetManufacturer data sheet (string inverter, microinverter or hybrid inverter).
Customer signatureThe account holder signs the application or authorization. We send the signature link.
Recent electric billName, service address, account and meter number must match the application.
Final inspection sign-offApproved electrical inspection from the authority having jurisdiction after installation.

Typical documents for US utilities – not yet verified for City of Heyburn. We confirm City of Heyburn’s exact list on the first project.

Idaho interconnection rule

Absence of a statewide IPUC rule inferred from utility-tariff structure (DSIRE not readable from server, search budget exhausted). Avista and RMP Idaho tariffs not reviewed.

Commission

Idaho Public Utilities Commission

Interconnection rule

No statewide small-generator interconnection rule found; utility-specific IPUC-approved tariffs (e.g., Idaho Power Schedule 68 'Interconnections to Customer Distributed Energy Resources', approved per Order No. 36892, eff. 2026-01-01) – Utility-specific interconnection tariffs · source

Applies to

IPUC-regulated IOUs each have their own tariff (Idaho Power, Avista, Rocky Mountain Power in Idaho). Idaho Power Schedule 68 applies to all customer generators in its Idaho service area qualifying for Schedules 6, 8, 84 or non-export.

Application form

Utility-specific application (Idaho Power: application form on its website / 'Apply to Connect Your System'; DERs >=3 MVA sign Uniform Customer Generator Interconnection Agreement)

Timelines

Idaho Power Schedule 68: incomplete applications withdrawn after 60 days; Feasibility Review within 7 business days (15 business days if additional studies); Feasibility Study agreement returned within 15 business days.

Fees

Idaho Power: $100 non-refundable application fee (also for modifications/expired applications); $1,000 Feasibility Study deposit; upgrades under Rule H.

Insurance

Idaho Power: $1,000,000 CGL per occurrence required in the Uniform Customer Generator Interconnection Agreement (DERs >=3 MVA); no insurance requirement found for smaller DERs in Schedule 68.

External disconnect

Idaho Power: Disconnection Equipment required for all customer DERs - lockable with Company padlock, visible break (circuit breakers do not qualify), labeled 'Generation Disconnect Switch', within 10 ft of interconnection point or with posted location instructions.

Export compensation

Net billing – Utility-specific (Idaho Power Schedules 6, 8, 84)
No statewide net metering statute. Idaho Power: net billing with variable export credit rate (current ECR held until April 2028 filing); Schedules 6/8 up to 25 kW, Schedule 84 up to greater of 12-month max demand or 100 kW; inverter systems measured by AC nameplate.

Not bound by the rule

Municipal utilities and electric cooperatives are not rate-regulated by the IPUC and set their own interconnection and net metering policies.

Idaho Power Schedule 68 - Interconnections to Customer DERs (I.P.U.C. No. 30, Order 36892): https://docs.idahopower.com/pdfs/aboutus/ratesregulatory/tariffs/Schedule68.pdf (retrieved 2026-11-13)
Idaho Power - Customer Generation: https://www.idahopower.com/accounts-service/clean-choices/solar-power-options-customer-generation/customer-generation/ (retrieved 2026-11-13)
Idaho Power - Retail Tariffs Idaho: https://www.idahopower.com/about-us/rates-and-regulatory/retail-tariffs-idaho/ (retrieved 2026-11-13)

Other utilities in Idaho

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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.