Choice Utilities File New Line Losses In Tariff Update

July 13, 2026

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Copyright 2026 EnergyChoiceMatters.com
Reporting by Paul Ring • ring@energychoicematters.com

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Pepco and Delmarva Power in Maryland have each filed tariff changes reflecting new line loss factors

The utilities do not use these values for billing of any customers.

The line loss info is, "provided in this tariff [to] inform third party suppliers of the nominal distribution system efficiency."

The updated line losses result from a 2024 Demand and Energy Loss Study. The line losses included in the tariff were last updated in 2014

The line loss info is below:

Pepco MD

Pepco - Loss Adjustment Factors For 
Capacity and Transmission Requirements

              Current       New
Residential
              1.0963      1.06867

General Service (GS)
              1.0964      1.06867

GS Medium Time Metered Low Voltage
              1.0963      1.06867

GS Medium Time Metered High Voltage
              1.0790      1.05278

GS Time Metered Low Voltage
              1.0941      1.06867

GS Time Metered High Voltage < 69kV
              1.0595      1.05278

GS Time Metered High Voltage 69kV
              1.0442      1.03661

Rapid Transit - MD
              1.0589      1.05278

Street Lighting - MD
              ---         1.06867




Pepco - Loss Adjustment Factors For
Hourly Energy

              Current       New
Residential
              1.0572      1.06143

General Service (GS)
              1.0572      1.06143

GS Medium Time Metered Low Voltage
              1.0572      1.06143

GS Medium Time Metered High Voltage
              1.0479      1.04244

GS Time Metered Low Voltage
              1.0559      1.06143

GS Time Metered High Voltage < 69kV
              1.0360      1.04244

GS Time Metered High Voltage 69kV
              1.0268      1.03238

Rapid Transit - MD
              1.0354      1.04244

Street Lighting - MD
              1.0624      1.06143




------------------



Delmarva -MD

Delmarva Energy Loss Factors 
(used for hourly energy settlement)

               Current       New
Secondary      1.07438     1.07340
Primary        1.04532     1.04701
Transmission   1.02861     1.02880



Delmarva Demand Loss Factors 
(used for annual PLC calculations)
               Current       New
Secondary      1.07820     1.08005
Primary        1.05669     1.05682
Transmission   1.03193     1.03191

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