How often are you revisiting your harmonic assessments?

Received a NSP compliance notice for exceeding harmonic emissions? This is becoming more common as NSPs refocus on ensuring planning limits are maintained.

The issue: measurements include background emissions from the grid itself—not just your plant. 

Standard practice excludes background emissions measured prior to commissioning (HP0). But the grid is evolving. Network changes and new inverter-based resources have changed the harmonic signature since you first connected... possibly many years ago.

The solution: update background data periodically (best practice - every 6 months) when the plant has planned or unplanned outages. With COMET continuously recording, just mark when your plant is offline and we capture clean background data automatically.

The result: defensible compliance data. Asset owners respond to NSP queries with confidence. NSPs get assurance that harmonics are genuinely within limits. This is the power of proactive compliance management using continuous monitoring.

Plot 1 shows the total emissions when no background data is available.

Plot 2 shows the plant emissions only, but background data is from commissioning.

Plot 3 shows the plant emissions when background data is updated from measurements during a recent outage.

How often are you revisiting your harmonic assessments? And what's triggering those reviews—NSP queries or proactive monitoring?