City of Columbia City interconnection application

City of Columbia City is a municipal utility serving 5,238 customers in Indiana (EIA-861, 2025). Gridpol files City of Columbia City 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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Indiana’s commission rule (170 IAC 4-4.3 (as amended by LSA #25-368, IURC RM #24-01)) does not bind municipal utilitys; City of Columbia City sets its own interconnection policy. We confirm its form on the first project. Municipal utilities and REMC/electric cooperatives are not bound by 170 IAC 4-4.3 or IC 8-1-40 (IC 8-1-40-4 excludes them) and set their own interconnection and DG policies (many through Hoosier Energy / Wabash Valley Power member policies, not reviewed).

City of Columbia City at a glance

Utility

City of Columbia City

Type

Municipal utility

EIA utility ID

4007

Customers

5,238 (EIA-861, 2025, short form: all customer classes)

Net-metered residential customers

none reported

Service territory

2 counties in Indiana

Documents City of Columbia City 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 Columbia City. We confirm City of Columbia City’s exact list on the first project.

Indiana interconnection rule

Commission

Indiana Utility Regulatory Commission (IURC)

Interconnection rule

170 IAC 4-4.3 (as amended by LSA #25-368, IURC RM #24-01) – Interconnection of customer facilities · source

Applies to

Investor-owned electric utilities subject to IURC jurisdiction (170 IAC 4-4.3-2). Municipal utilities and electric cooperatives are not covered.

Application form

Commission-approved interconnection application and interconnection agreement forms, used by each IOU (170 IAC 4-4.3-4(c)).

Timelines

Level 1/2: completeness notice 10 business days; determination 15 business days after complete; executable agreement 10 business days after approval; customer returns executed agreement at least 10 business days before operation; final approval after executed agreement and any inspection, conditioned on electrical code official approval (170 IAC 4-4.3-6, -7).

Fees

Level 1: no fee. Level 2: <= $50 + $1/kW nameplate (+ minor modifications/additional review, engineering <= $100/h). Level 3: <= $100 + $2/kW + study time (<= $100/h) (170 IAC 4-4.3-4(e)).

Insurance

Net metering facilities: liability coverage of at least $100,000 (homeowners, commercial or other); utility may not require higher limits or additional policies (170 IAC 4-4.2-8, referenced by 4-4.3-10(a)). Other customer facilities: only reasonable amounts of insurance against reasonably likely risks, mutual indemnification (170 IAC 4-4.3-10(b)).

External disconnect

Utility may require the applicant to include a disconnect switch as a supplement to the equipment package (170 IAC 4-4.3-4(d)).

Export compensation

Net billing – IC 8-1-40 (P.L.264-2017, SEA 309); 170 IAC 4-4.2 (net metering rule, legacy)
Net metering tariffs closed to new customers after June 30, 2022 (IC 8-1-40-11); legacy NEM customers continue per IC 8-1-40-13/-14. New distributed generation (<= lesser of 1 MW or average annual consumption, IC 8-1-40-3) is credited for excess distributed generation (instantaneous difference, IC 8-1-40-5) at 1.25 x the supplier's average marginal price of electricity of the prior year (IC 8-1-40-17). Applies to IURC-regulated public utilities; excludes municipally owned utilities and certain cooperatives (IC 8-1-40-4).

Not bound by the rule

Municipal utilities and REMC/electric cooperatives are not bound by 170 IAC 4-4.3 or IC 8-1-40 (IC 8-1-40-4 excludes them) and set their own interconnection and DG policies (many through Hoosier Energy / Wabash Valley Power member policies, not reviewed).

IURC Final Rulemaking RM #24-01 (LSA #25-368), amended 170 IAC 4-4.3: https://www.in.gov/iurc/files/ord_RM24-01_093025.pdf (retrieved 2026-11-13)
170 IAC 4-4.2-8 Insurance (net metering): https://www.law.cornell.edu/regulations/indiana/170-IAC-4-4.2-8 (retrieved 2026-11-13)
170 IAC 4-4.2-1 Definitions (net metering): https://www.law.cornell.edu/regulations/indiana/170-IAC-4-4.2-1 (retrieved 2026-11-13)
IURC handout: IC 8-1-40 statute text: https://secure.in.gov/iurc/files/2017-07-20-IURC-Tech-Conf-Handout-re-IC-8-1-40.pdf (retrieved 2026-11-13)

Other utilities in Indiana

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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.