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Investor-owned utility

Central Maine Power (CMP) interconnection application

Central Maine Power (CMP) is an investor-owned utility serving 584,462 residential customers in Maine (EIA-861, 2025). Applications: Own online portal (CMP Interconnection Application Request Portal). Gridpol files Central Maine Power (CMP) 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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Partly researched from official sources. verify on first project: cmpco.com (Avangrid) timed out/blocked from our network - confirm portal URL, Level 1 document list, Level 1 email, steps to PTO and storage rules; Chapter 324 framework same as Versant.

Central Maine Power (CMP) at a glance

Utility

Central Maine Power Co (Avangrid (Iberdrola))

Type

Investor-owned utility

EIA utility ID

3266

Residential customers

584,462 (EIA-861, 2025)

Net-metered residential customers

16,367 (EIA-861, 2025)

Service territory

14 counties in Maine

How to apply

Own online portal – CMP Interconnection Application Request Portal

Who submits

Applicant fills out CMP New Service Request online form before submitting portal application(s) (per CMP page snippet).

Export compensation

Net billing – Net Energy Billing (MPUC Chapter 313)

Documents Central Maine Power (CMP) asks for

  • Interconnection application formLevel 1 application for certified inverter-based facilities <=25 kW (Chapter 324) Gridpol prepares this.
  • Interconnection agreementLevel 1 Interconnection Agreement (Forms and Agreements 3)

Fees

FeeApplies toNote
$100Level 1 application (Chapter 324)MPUC cost summary also lists $150 cost-sharing and $40 ombudsman fee for Level 1

Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.

Size levels and limits

LevelUp toNote
Level 125 kWInverter-based, Chapter 324

Levels 2-4 per Chapter 324 (see Versant entry)

Sources

Maine interconnection rule

Commission

Maine Public Utilities Commission

Interconnection rule

65-407 C.M.R. Chapter 324 – Small Generator Interconnection Procedures · source

Applies to

Transmission and distribution utilities (T&D Utilities: CMP, Versant Power and other entities owning T&D plant for compensation in Maine) for generators subject to Commission jurisdiction (not FERC-jurisdictional). Rule text does not separately address consumer-owned utilities.

Application form

Statewide standard forms adopted by Commission order must be used for all interconnection applications, interconnection agreements and study agreements (Ch. 324 s.4); deviations need Commission approval

Timelines

Completeness notice within 5 business days (10 business days to cure); Level 1 screens 10 business days, deemed approval after 20 business days; Level 2 screens 15 business days; executable agreement within 10 business days of passing screens; applicant returns executed agreement within 30 business days; utility site visit before Level 1 agreement. Agreement may be terminated if not energized within 12 months of approval.

Fees

Level 1: $100. Level 2: $100 + $2/kW of generator capacity. Higher levels: study costs per Ch. 324 s.3 cost responsibility.

Insurance

Utility may require insurance only above thresholds: inverter-based none <=1 MW, $1M >2-5 MW, $2M >5 MW; non-inverter none <=50 kW, $500k 50-500 kW, $1M 0.5-2 MW, $2M 2-5 MW, $3M >5 MW. No additional liability insurance for s.5-compliant facilities unless applicant agrees.

External disconnect

Utility shall not require additional controls, expressly including a utility-accessible disconnect switch, for facilities certified under Ch. 324 s.5 (IEEE 1547/UL 1741).

Export compensation

Net billing – 35-A M.R.S. s.3209-A (kWh credit) and s.3209-B (tariff rate); 65-407 C.M.R. Chapter 313 (Net Energy Billing)
Net energy billing for DG resources <5 MW (kWh-credit and tariff-rate programs). Unused kWh credits expire per Commission rule; value remitted to low-income programs. Heavily amended 2023-2025 (PL 2025 c.430 ends new agreements for utility-side-of-meter resources after 2025-12-31); check current Ch. 313 for new projects.

Not bound by the rule

Not addressed in Ch. 324 text; Maine's consumer-owned T&D utilities are generally Commission-regulated T&D utilities - confirm applicability with the specific utility.

Other utilities in Maine

All Maine 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.

Get started – $500/month unlimited