Maine interconnection applications
9 electric utilities serve Maine (EIA-861, 2025): 2 investor-owned utilitys, 2 electric cooperatives, 5 municipal utilitys. Together they serve 746,186 residential customers; 18,997 residential customers were on net metering at year-end 2025.
Largest utilities in Maine
Investor-owned utility · 584,462 residential customers · Maine
Applications: Own online portal – CMP Interconnection Application Request Portal
Interconnection process and documents →Investor-owned utility · 137,839 residential customers · Maine
Applications: Own online portal – Adobe Sign e-sign application (Level 1 / Levels 2-4)
Interconnection process and documents →Electric cooperative · 10,808 residential customers · Maine
Interconnection process and documents →Municipal utility · 6,723 residential customers · Maine
Interconnection process and documents →Municipal utility · 3,907 residential customers · Maine
Interconnection process and documents →Municipal utility · 2,447 residential customers · Maine
Interconnection process and documents →Electric cooperative · 2,151 customers · Maine
Interconnection process and documents →Municipal utility · 1,369 customers · Maine
Interconnection process and documents →Municipal utility · 132 customers · Maine
Interconnection process and documents →Export compensation among the researched Maine utilities: Net billing. Rules differ by utility – see each utility page.
Maine interconnection rule
Maine Public Utilities Commission
Interconnection rule65-407 C.M.R. Chapter 324 – Small Generator Interconnection Procedures · source
Applies toTransmission 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 formStatewide 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
TimelinesCompleteness 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.
FeesLevel 1: $100. Level 2: $100 + $2/kW of generator capacity. Higher levels: study costs per Ch. 324 s.3 cost responsibility.
InsuranceUtility 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 disconnectUtility 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 compensationNet 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 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.
| Level | Up to | Criteria / review / fee |
|---|---|---|
| Level 1 | 25 kW | inverter-based generators not greater than 25 kW; screens s.7(A),(E),(I) (+ s.9(A) for networks) · completeness 5 business days; screens 10 business days after complete; agreement 10 business days; deemed approved if no decision in 20 business days · $100 |
| Level 2 | 2000 kW | generators not greater than 2 MW passing screens s.7(A)-(J) · completeness 5 business days; screens 15 business days after complete; agreement 10 business days · $100 + $2/kW |
| Level 3 | 10000 kW | non-exporting generators not greater than 10 MW · $100 + $3/kW (per CMP summary; not confirmed in current rule text) |
| Level 4 | all generators not subject to FERC jurisdiction not qualifying for Levels 1-3; feasibility/impact/facilities studies; site control documentation required |
- 65-407 C.M.R. ch. 324 (LII): https://www.law.cornell.edu/regulations/maine/department-65/division-407/chapter-324 (retrieved 2026-11-13)
- Ch. 324 s.11 Level 1: https://www.law.cornell.edu/regulations/maine/65-407-C-M-R-ch-324-SS-11 (retrieved 2026-11-13)
- Ch. 324 s.12 Level 2: https://www.law.cornell.edu/regulations/maine/65-407-C-M-R-ch-324-SS-12 (retrieved 2026-11-13)
- Ch. 324 s.15 General provisions (insurance, disconnect): https://www.law.cornell.edu/regulations/maine/65-407-C-M-R-ch-324-SS-15 (retrieved 2026-11-13)
- 35-A M.R.S. s.3209-A Net energy billing: https://www.mainelegislature.org/legis/statutes/35-A/title35-Asec3209-A.html (retrieved 2026-11-13)
- MPUC Order Adopting Rule, Docket 2023-00103: https://www.maine.gov/mpuc/sites/maine.gov.mpuc/files/inline-files/PUC%20Order%20Ch.%20324%2011-3-23.docx (retrieved 2026-11-13)
All 9 utilities in Maine
- Central Maine Power (CMP)584,462
- Versant Power137,839
- Eastern Maine Electric Cooperative10,808
- Kennebunk Light & Power District6,723
- Houlton Water Company3,907
- Town of Madison2,447
- Fox Islands Electric Cooperative, Inc.0
- Van Buren Light & Power District0
- Matinicus Plantation Electric Company0
Residential customers in Maine per EIA-861 (2025). Customer counts = bundled + delivery-only service (EIA-861 Part A + Part D). Service territory is reported by county; a county can be served by several utilities.
$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
Applications are typically submitted within 2 business days after complete documents. Utility review times are set by each utility.