Interchange Meter Error (IME) term in the ACE equation is used to compensate for which of the following?

• A. Equipment error in meters
• B. Calibration drift
• C. Data latency
• D. Frequency bias error

Answer: (A)

Interchange Meter Error is the adjustment in the ACE calculation that accounts for inaccuracies in the interchange meters. It compensates for equipment error in meters so the ACE reflects the actual energy interchange rather than instrument bias or faulty readings. Data latency deals with delays in data, not meter accuracy, and is not addressed by this term. Frequency bias error is a separate concept that corrects for a persistent bias in frequency measurements or system response, not the meter error itself. Calibration drift contributes to meter error, but IME serves as the overall correction for meter measurement errors to keep ACE aligned with real interchanges.