Maryland interconnection applications
12 electric utilities serve Maryland (EIA-861, 2025): 4 investor-owned utilitys, 3 electric cooperatives, 5 municipal utilitys. Together they serve 2,464,210 residential customers; 118,789 residential customers were on net metering at year-end 2025.
Largest utilities in Maryland
Investor-owned utility · 1,220,644 residential customers · Maryland
Applications: Own online portal – Connect the Grid (Intellio) Interconnection Application Portal
Interconnection process and documents →Investor-owned utility · 883,572 residential customers · Maryland
Applications: Own online portal – Connect the Grid Interconnection Portal (Green Power Connection)
Interconnection process and documents →Investor-owned utility · 396,593 residential customers · Maryland
Applications: Own online portal – FirstEnergy Interconnection Portal
Interconnection process and documents →Investor-owned utility · 493,163 residential customers · Maryland
Applications: Own online portal – Connect the Grid Interconnection Portal (Green Power Connection)
Interconnection process and documents →Electric cooperative · 163,451 residential customers · Maryland
Interconnection process and documents →Electric cooperative · 50,981 residential customers · Maryland
Applications: PowerClerk – PowerClerk
Interconnection process and documents →Municipal utility · 14,878 residential customers · Maryland
Interconnection process and documents →Municipal utility · 8,884 residential customers · Maryland
Interconnection process and documents →Electric cooperative · 33,261 residential customers · Maryland
Interconnection process and documents →Municipal utility · 2,914 customers · Maryland
Interconnection process and documents →Municipal utility · 2,756 customers · Maryland
Interconnection process and documents →Municipal utility · 1,026 customers · Maryland
Interconnection process and documents →Export compensation among the researched Maryland utilities: NEM. Rules differ by utility – see each utility page.
Maryland interconnection rule
Maryland Public Service Commission (PSC)
Interconnection ruleCOMAR 20.50.09 (.01-.14) – Small Generator Facility Interconnection Standards · source
Applies toSmall generator facilities (incl. storage) interconnecting to a utility's distribution system in Maryland, under PSC jurisdiction (Subtitle 50 'Service Supplied by Electric Companies': BGE, Pepco, Delmarva, Potomac Edison, SMECO, Choptank and other PSC-regulated electric companies). PJM-jurisdictional wholesale requests follow PJM.
Application formUtility-specified interconnection request form (utilities must align forms with other MD utilities) with electronic signature/submission and status tracking on the utility website by applicant or authorized designee (20.50.09.04).
TimelinesLevel 1: 5 BD completeness, 15 BD verification, 20 BD approval/PTO; interconnection agreement signed within 30 calendar days. Conditional approval validity: <=100 kW must deliver certificate of completion within 6 months, >100 kW within 12 months (+6 months extension) (20.50.09.06N).
FeesNo fee for Level 1; Levels 2-4 fees specified in utility tariff (20.50.09.05); no fees for PJM-jurisdictional requests; pre-application report fee per tariff.
InsuranceCOMAR 20.50.09.06 contains no insurance requirement; PUA §7-306 bars electric companies from requiring net-metered systems meeting NEC/IEEE/UL to buy additional liability insurance.
External disconnectRequired: lockable, visible-break isolation device accessible to the utility, customer-owned, between facility and point of interconnection (20.50.09.06G); utility lockbox allowed (06H). No inverter waiver in rule text.
Export compensationNEM – Md. Code, Public Utilities §7-306; COMAR 20.50.10
Offered until earlier of 3,000 MW statewide or 2027-07-01; 5 MW for community solar/meter aggregation; excess credited 12 months valued at commodity rate, paid after April cycle; indefinite accrual option not for munis/coops; coops <250,000 may pay monthly. COMAR 20.50.10.01 still shows 1,500 MW (stale).
Net metering statute §7-306 contains specific provisions for municipal utilities and cooperatives, i.e. they offer net metering too; PSC-regulated coops (SMECO, Choptank) follow COMAR 20.50.09.
| Level | Up to | Criteria / review / fee |
|---|---|---|
| Level 1 | 20 kW | Inverter-based, lab-certified, <=20 kW nameplate incl. multiple facilities at one PCC · Complete/incomplete notice 5 BD; safety verification 15 BD after complete; approval/PTO within 20 BD of acceptable documents · No fee (fees only for Levels 2-4) |
| Level 2 | 2000 kW | Certified/field-approved equipment on radial circuit or single-customer spot network · Per utility tariff |
| Level 3 | 10000 kW | Non-exporting: area network <=50 kW (aggregate lesser of 5% max load or 50 kW) or radial circuit <=10 MW, no utility construction · Per utility tariff |
| Level 4 | Requests failing Levels 1-3; study review · Per utility tariff; study costs |
- COMAR 20.50.09: https://regs.maryland.gov/us/md/exec/comar/20.50.09 (retrieved 2026-11-13)
- COMAR 20.50.09.08 Levels: https://regs.maryland.gov/us/md/exec/comar/20.50.09.08 (retrieved 2026-11-13)
- COMAR 20.50.09.09 Level 1: https://regs.maryland.gov/us/md/exec/comar/20.50.09.09 (retrieved 2026-11-13)
- COMAR 20.50.09.06 General: https://regs.maryland.gov/us/md/exec/comar/20.50.09.06 (retrieved 2026-11-13)
- PUA §7-306: https://mgaleg.maryland.gov/mgawebsite/laws/StatuteText?article=gpu§ion=7-306 (retrieved 2026-11-13)
All 12 utilities in Maryland
- BGE1,220,644
- Pepco558,809
- Potomac Edison258,523
- Delmarva Power187,814
- SMECO163,451
- Choptank Electric Cooperative, Inc.50,981
- Hagerstown Light Department14,878
- Easton Utilities Comm8,884
- A & N Electric Cooperative226
- Thurmont Municipal Light Company0
- Town of Berlin0
- Town of Williamsport0
Residential customers in Maryland 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.