Maryland Interconnection
Interconnect Small Generation to the Distribution System
Prior to completing the application process, a customer interested in interconnecting small generation with Potomac Edison's distribution system must first determine the size and type of equipment to install in accordance with the Company's tariffs.
Online Portal
As of June 23, 2025, interconnection applications will ONLY be accepted through the online portal. Emailed and faxed applications will not be accepted.
We are excited to announce the launch of our new online interconnection Portal! The online portal will make the application process more convenient and efficient for you. We strongly encourage you to explore the benefits of using the new portal and are interested in your feedback.
Features & Benefits of Online Applications
- Access to all your interconnection accounts with a secure login
- Ability to check the status of applications
- Ability to upload all necessary documents
- Capability to pay fees electronically either by a one-time bank or credit card payment using your contact/customer account number and invoice number
- Submit multiple applications
- Save and edit your applications
- Save time and avoid errors
Effective November 6, 2025 – Interconnection Application Fees
Interconnection customers will now be charged an initial application fee payable through the interconnection portal upon submission. See Applicable Application Fee section below for the fee structure.
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Check Here for Additional Messages
- Effective November 24, 2925 - Level 4 Study Fees
Non-residential Level 4 interconnection customers will now be charged study fees as outlined in MD COMAR 20.50.09.12. - Effective January 1, 2024 - New Inverter Setting Requirements
New setting requirements related to the installation and operation of inverter-based DER in Potomac Edison's (MD) service territory. Click Here to Review Details
- Effective November 24, 2925 - Level 4 Study Fees
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Step 1 - Required Size & Type of Equipment
If you are interested in interconnecting small generation with the Potomac Edison's distribution system you must first determine the size and type of equipment which best suits your requirements in accordance with the Company's Tariff. The Interconnection Tariff rate schedule is available on the Company's Maryland tariffs page.
To be eligible for interconnection, the nameplate generation capacity limit is 10,000 kW.
Additional requirements are contained at Title 20 PUBLIC SERVICE COMMISSION; Subtitle 50 SERVICE SUPPLIED BY ELECTRIC COMPANIES, Chapter 9 Small Generator Interconnection Standards. The regulations are posted by the Maryland Office of the Secretary of State*.
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Step 2 - Type of Application Based on Capacity Level
- Level 1 - less than or equal to 20 kW, Inverter-based
- Level 2, 3, and 4 - generation size is greater than 20 kW
- Level 1 - less than or equal to 20 kW, Inverter-based
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Step 3 - Applicable Application Fees
As of November 6, 2025, a fee structure has been established for Interconnection Applications.
- Level 1 – No fee
- Level 2 - $50 plus $1/kW of the system’s nameplate capacity
- Level 3 & 4 - $100 plus $2/kW of the system’s nameplate capacity
Effective November 24, 2925 - Level 4 Study Fees
Non-residential Level 4 interconnection customers will now be charged study fees as outlined in MD COMAR 20.50.09.12. - Pre-Applications - $300
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Step 4 - Required Site Plan & One-Line Diagram
You are required to submit a site plan and one-line diagram with your application. The online application allows you to attach these documents during the fourth step of the application process.
Submit Site PlanPlease do not send overhead internet photos. The site plan must include:
- Overall property layout and street access including North arrow orientation and the nearest cross street in each direction. (Indicate direction of nearest cross street if impractical to show on drawing).
- Ground mounted installations must show clearances and details of surrounding structures especially how they cross the Company's facilities. The route and length of the electrical connection to the premise is also required.
- Location of the DER AC disconnect meeting the requirements of the NEC - for self-contained metering locations.
- Location of the DER utility required AC visible break disconnect - for metering locations utilizing instrument transformers.
- Location of generation, inverter, storage and associated electrical equipment.
- Location of service transformer.
Submit One-Line DiagramThe one-line diagram must include:
- Energy source (PV array, wind turbine, etc.). Please indicate DC and AC ratings as appropriate.
- Please indicate AC rating of the inverter.
- Identify the make and model of the disconnect switch and note if it is lockable with a visible break when required.
- Identify connection to Customer’s electrical system.
- Identify utility meter, inverter and/or associated generation and storage (battery) equipment.
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Step 5 - Complete & Submit Application, Documents & Fees
Complete Your Application
NEW Online Portal Now Available
We are excited to announce the launch of our new online interconnection Portal! The online portal will make the application process more convenient and efficient for you. We strongly encourage you to explore the benefits of using the new portal and are interested in your feedback.
Applications
- Net Energy Metering Rider Application
To be eligible for net metering, the nameplate generation capacity limit is 2,000 kW.
The energy sources are restricted to biomass, solar or wind. Additional requirements are contained at Title 20 PUBLIC SERVICE COMMISSION ("PSC"), Subtitle 50 SERVICE SUPPLIED BY ELECTRIC COMPANIES, Chapter 10 Net Metering. The regulations are posted by the Maryland Office of the Secretary of State at: http://www.dsd.state.md.us/comar/SubtitleSearch.aspx?search=20.50.10.*
- Net Energy Metering Rider Application
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Step 1 - Engineering Review
Your application will be received and reviewed by our Engineering Department to ensure that:
- Application has been completed correctly
- All drawings and documentation have been provided.
- Associated fees have been determined and paid.
- The design is consistent with Company policy and State requirements.
Our Company will process the application under the schedule provided for by the rules approved by the Public Utility Commission of Maryland. -
Step 2 - Customer Notification
After the engineering review, you will be notified via email or phone as to whether:
- Application is approved.
- An upgrade and fee is required.
- Information is incorrect or missing in the application.
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Step 1 - Customer Installation
Following approval of the application, the Customer installs the facility in accordance with the Application, PUCO rules and the Company's Requirements for Interconnection of Customer-Owned Generation to the FirstEnergy Distribution System.
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Step 2 - Customer Agreement & Proof of Inspection
Following installation of your generation equipment, you must complete and submit the Interconnection Agreement with the following attachments:
Select the appropriate Interconnection Agreement.
- Level 1 Interconnection Certificate of Completion
- Levels 2, 3, and 4 Interconnection Agreement
- Levels 2, 3, and 4 Interconnetion Certificate of Completion
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Step 3 - Company Final Review & Approval to Operate
Engineering will:
- Review the as-built installation and final documentation for compliance.
- Determine the need for a witness test as provided for in the regulations and notify customer.
- Finalize documentation and authorize system operation.
- Notify customer of the status of customer's application.
- Arrange for the installation of net energy metering, where appropriate.
Note: Generation interconnection should not be energized prior to electrical inspection and receipt of Certificate of Completion signed by authorized Company personnel.
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Step 4 - Company Installs Net Meter
If you receive Approval to Operate, the Company will automatically replace the existing meter with a meter capable of bi-directional registration. Depending on meter availability and other work priorities, this may take several weeks.
Although you do not have to wait until the bi-directional meter is installed to operate your facility, FirstEnergy will not be responsible for tracking and crediting your excess generation until it is installed.You should be aware that depending on the type of meter currently set at your service location:
- Your existing meter could offset your usage by your excess generation, thereby "netting" your energy flows internally, rather than separately registering the energy in and out of your facility.
- Your existing meter may include a feature that prevents it from turning backwards and registering reverse power flow. In this case, even though your facility should reduce the amount of electricity you need to purchase, the electricity your facility generates in excess of your current consumption would not be measured or subtracted from your overall electrical energy use.
- Your existing meter may register the kilowatt-hours your facility is providing to FirstEnergy's system as though they were being delivered to you from FirstEnergy's system. You should not operate your facility in this circumstance since it will result in charges for the energy that you generate. Please check with your installer to ensure that you do not have this type of meter before operating your facility.
Additional Technical Requirements and References
- Interconnection Guide - Single Phase
- Interconnection Guide - Three Phase
- Maryland Tariffs
- Frequently Asked Questions
- Signage Requirements
- Commissioning Test Requirements
- Bi-Directional Metering Information
- Large Generator Interconnection Queue
- Interconnection Change Notice
- Work Request Progress Tracker
- Limited Export Agreements
Applications
- DER Pre-Application
- Interconnection Portal (Online)
- Level 1 Interconnection Certificate of Completion (Revised 1/2025)
- Levels 2, 3 and 4 Interconnection Agreement (Revised 1/2025)
- Levels 2, 3, and 4 Interconnetion Certificate of Completion
- Net Energy Metering Rider Application
- IEEE-1547-2018 Specified Inverter Settings (New 12/21/23)
- IEEE-1547-2018 Specified Inverter Settings File in EPRI CSV Common File Format (New 12/21/23)
Submit Applications and Fees or Questions
Potomac Edison
Interconnection Portal Admin
Request Username & Password
Email: PE-MD_interconnection@firstenergycorp.com
Application & Fees
Email: PE-MD_interconnection@firstenergycorp.com
Fax: 234-678-2505
Address:
Potomac Edison Company
Regional Engineering
Attn: PE-MD Interconnection Coordinator
10802 Bower Avenue
Williamsport, MD 21795-3016
Questions
Technical and Policy
Email: PE-MD_interconnection@firstenergycorp.com
General Meter & Billing
Customer Service - 1-800-686-0011
*By clicking the links to the websites listed under additional resources above you are leaving the FirstEnergy website and entering a third-party website. FirstEnergy is not responsible for the content of their websites.