Potomac Edison

Maryland Utility Interconnection & net metering rules

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Tariffs and interconnection rules move often. If something here is out of date or missing, tell us and we'll fix it.

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Net Metering AllowedYes
Supply Side Taps AllowedYes
Line Taps AllowedYes
Load Taps AllowedYes
AC Disconnect RequiredYes

Net metering & export

Net Metering Allowed
Yes
TOU Utility
No
Post Solar Billing Method
Net Metering
Solar Export Type
N/A
Rebates Offered
Yes
Deregulated
No
Allows Standby
Yes

Interconnection & taps

Approval Req To Install
Yes
Supply Side Taps Allowed
Yes
Line Taps Allowed
Yes
Load Taps Allowed
Yes
Automatic Transformer Upgrade Size
0
Meter Aggregation Allowed
Yes

System size & offset

System Size Restrictions
0
System Size Restriction Type
No Restrictions
System Size Battery Included
No
System Size Includes Existing Systems
No
Offset Type
Percentage
Offset Value
200
Offset Calculation Basis
Historical
Offset Calculation Period
12
Industry Standard Watts Sqft
2
System Offset Notes


Offset Calc Tool
Historical Usage

Metering & disconnect

Production Meter Required
No
Production Meter Position
N/A
Production Meter Labeling
N/A
AC Disconnect Required
Yes
AC Disconnect Labeling
Utility Disconnect Switch

Plans & docs

Site Plan Reqs
  • 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).
  • Identify utility meter, inverter and/or associated generation and storage (battery) equipment.
  • An external disconnect is required within 10 feet of the meter location.
  • 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.
SLD Reqs
  • 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.

BATTERY JOBS

  • For Tesla Powerwalls: A single disconnect can be used to isolate both sources (PV solar and battery) OR a second visible-break disconnect switch can be used for the battery(s). The Tesla Gateway does not take the place of the required disconnect.
Install Reqs


Placards
  • See Signage Requirements
  • The switch shall be clearly marked, "Generator Disconnect Switch”, with permanent 3/8 inch or larger letters.
Electrical Stamp Required
No
Meter Num Req SLD 3LD
No
ESID Num Req SLD 3LD
No
Website
link
Phone
(800) 686-0011
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Potomac Edison before you rely on this. The useful move: if an installer says you need a main panel upgrade, ask how these tap and interconnection policies were considered first.