GRESB converter: Methodology & assumptions

Scaler’s internal GRESB converter migrates historical sustainability data from the GRESB Asset-Level Spreadsheet submission (ALS) into the Scaler bulk upload Spreadsheet format. The converter provides an initial, structured import of asset-level data, supporting new clients who previously completed GRESB reporting and enabling a faster transition into Scaler.

Unless supplementary documentation or clarifications are provided, the converter applies the following assumptions across all mapped components.

Unit system

All unit system values are assumed to be Metric, consistent with the standardized GRESB reporting format.

Owned since

If the owned since field is not present in the ALS, the converter applies a default date of the first day of the previous calendar year (e.g., 1 January 2023), unless the ALS indicates that the asset became a standing investment within the two most recent reporting periods.

Active in analytics

Assets are assumed to be active in the Analytics Portal by default. This configuration can be modified later at the asset level if required.

Active in reporting outputs

Assets are assumed to be included in reporting outputs unless manually adjusted.

Unit system

Floor area units are assumed to follow the Metric system.

Gross floor area

Gross floor area (GFA) is inferred using the earliest reporting year available in the ALS.

“Since” dates

If “since” dates are not provided, the converter defaults them to the first day of the relevant reporting period.

Unit system

Certification data is assumed to use the Metric system.

Date obtained

If missing, certification dates default to the first day of the reporting period.

Unit system

Energy meter units are assumed to be Metric.

Monitoring method

Monitoring method defaults to conventional meter unless the ALS indicates smart metering or estimation.

Purchased by

The Purchased by field is inferred from the associated Area type (e.g., landlord, tenant).

Assumptions follow the same logic as energy meters:

The same assumptions apply:

Non-operational EV charging data contained in the ALS is not transferred to the Scaler upload template. This data must be added manually and allocated to the appropriate area type (e.g., exterior, common).

To support data completeness during migration, certain information not captured by GRESB should be prepared alongside the ALS.

The ALS provides Gross asset value (GAV) and Percent of ownership only for the current reporting year. Scaler requires these values for both the current and prior periods; therefore, prior-year values should be added to the Reporting Characteristics sheet of the GRESB export before migration.

Assistance can be provided upon request.

When converting a GRESB spreadsheet, renewable energy values are distributed across the appropriate Electricity and District Heating & Cooling (DHC) meters in Scaler. The converter follows a two-step process to ensure renewable energy lands on the correct meter without being double-counted.

Renewable energy is distributed in two passes:

For each pass, the converter applies an exact-match allocation rule first, and only falls back to priority-based distribution if no single match is found.

Before applying priority logic, the converter checks whether the renewable energy value exactly matches the reported consumption of one eligible meter for the same energy type (Electricity or DHC).

Note Exterior areas and EV charger meters are excluded from this check. Renewable energy is never allocated to these meters through the exact-match rule.

If no single exact match is found, renewable energy is distributed across meters following a fixed priority chain. The converter fills each meter up to its reported consumption, then moves to the next meter in the chain.

The starting point of the chain depends on who procured or consumed the renewable energy. If the primary meters are fully filled, the chain extends to the remaining eligible meters as a fallback.

Tip The converter does not split renewable energy proportionally. Each meter is filled to its reported consumption before moving to the next one in the chain.

If the total renewable energy reported exceeds the sum of consumption across all eligible meters in the priority chain, the converter raises an error. The same error is raised if renewable energy remains undistributed after the full priority chain has been exhausted.

This prevents renewable energy from being recorded against meters with no consumption to offset, and flags potential reporting inconsistencies in the source GRESB file.