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Gap-filling refers to estimation methods used to fill missing meter readings so you can report complete annual data. GRESB accepts certain estimation approaches when actual data is unavailable.
How Abisko Expands from ESPM: ESPM allows manual data entry but doesn’t track estimation methodology. Abisko documents which values are estimated vs actual and applies GRESB-compliant estimation methods automatically.

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Acceptable Gap-Filling Methods

MethodWhen to UseGRESB Compliant
ProrationPartial month readings✅ Yes
Prior year same periodStable consumption patterns✅ Yes
Weather normalizationClimate-dependent loads✅ Yes
InterpolationSingle missing month✅ Yes
Flat estimationNo basis for calculation⚠️ Flag required

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How Gap-Filling Works in Abisko

1

Identify gaps

Data Quality dashboard highlights properties with incomplete data
2

Review gap details

Click property → Meters → see specific date ranges missing
3

Select estimation method

Abisko suggests appropriate method based on gap size and data patterns
4

Apply and document

Estimated values flagged in exports so GRESB knows methodology used
Best Practice: Gap-fill early in the year when you still have time to chase down actual utility bills. Estimated data counts toward completeness but actual data is always preferred.

Data Completeness

Estimated Bills

Gaps