Potomac Edison interconnection application

Potomac Edison is an investor-owned utility serving 396,593 residential customers in Maryland, West Virginia (EIA-861, 2025). Applications: Own online portal (FirstEnergy Interconnection Portal). Gridpol files Potomac Edison 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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Process verified from Potomac Edison’s official sources (see below). WV process (firstenergycorp.com/feconnect/westvirginia.html) not checked; storage-specific form for MD not confirmed.

Potomac Edison at a glance

Utility

The Potomac Edison Company (FirstEnergy)

Type

Investor-owned utility

EIA utility ID

15263

Residential customers

396,593 (EIA-861, 2025)

Net-metered residential customers

10,224 (EIA-861, 2025)

Service territory

7 counties in Maryland, 8 counties in West Virginia

How to apply

Own online portal – FirstEnergy Interconnection Portal · official link

Who submits

Customer or installer via online portal; since 2025-06-23 only portal applications accepted (no email/fax).

Export compensation

NEM – Maryland Net Energy Metering Rider (COMAR 20.50.10)
standard meter does not register export; NEM application needed for bi-directional meter

Review time (official)

Processed per COMAR 20.50.09 schedule (Level 1: completeness notice 5 business days, approval/PTO within 20 business days of acceptable documents).

Documents Potomac Edison asks for

Interconnection application formLevel 1 (<=20 kW) or Level 2-4 application in portal Gridpol prepares this.
Site plan / site layoutno overhead internet photos; property layout, north arrow, nearest cross streets, route/length of connection, DER AC disconnect location (visible-break for CT metering), generation/inverter/storage locations, service transformer Gridpol prepares this.
Single-line diagram (one-line)energy source with DC/AC ratings, inverter AC rating, disconnect make/model and lockable visible break, connection point, utility meter, inverter and battery equipment Gridpol prepares this.
Net metering / net billing agreement (when applicable)Net Energy Metering Rider Application
Interconnection agreementafter installation
Final inspection sign-offCertificate of Completion with electrical inspection evidence

How the Potomac Edison process runs

Determine size/type and application level (online portal determines level from data entered)
Submit application with site plan and one-line diagram in the FirstEnergy Interconnection Portal; pay fee online
Engineering review; customer notified by email/phone: approved, upgrade+fee required, or information missing/incorrect
Install per approved application and FirstEnergy interconnection requirements
Submit signed Interconnection Agreement with Certificate of Completion and evidence of electrical inspection
Company final review, possible witness test, Approval to Operate (do not energize before)
Company replaces meter with bi-directional net meter (may take several weeks; excess not credited until installed)

Fees

Fee	Applies to	Note
$0	MD Level 1 (<=20 kW inverter-based)	fee structure effective 2025-11-06
$50 + $1/kW	MD Level 2
$100 + $2/kW	MD Level 3 & 4	non-residential Level 4 study fees per COMAR 20.50.09.12
$300	Pre-application

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

Size levels and limits

Level	Up to	Note
Level 1	20 kW	inverter-based
Level 2-4	10000 kW	>20 kW
Net metering cap	2000 kW

MD: interconnection limit 10,000 kW; NEM limit 2,000 kW (biomass, solar, wind)

Storage, EV and stamps

Battery storage

Site plan and one-line must show storage (battery) equipment; Limited Export Agreements guidance available for MD.

Common issues the utility lists

Application not completed correctly
Drawings/documentation missing
Fees not determined/paid
Overhead internet photos submitted instead of a site plan
Design inconsistent with company policy/state requirements

Gridpol’s pre-submission check covers these before we file.

Sources

FirstEnergy Maryland Interconnection (Potomac Edison): https://firstenergycorp.com/feconnect/maryland.html (retrieved 2026-11-13)
COMAR 20.50.09.09: https://regs.maryland.gov/us/md/exec/comar/20.50.09.09 (retrieved 2026-11-13)

Other utilities in Maryland

All Maryland 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.