Your Year in ESG | August 13, 2025
Secure up to 100% energy data coverage for GRESB reporting
Updated from January 2025
While the Global Real Estate Sustainability Benchmark (GRESB) portal won’t open for submissions until April 2026, real estate managers and directors are already gearing up for the 2025 calendar year reporting cycle. The most forward-thinking among them are acting now, ahead of the year-end data scramble, to secure accurate and complete data coverage.
The clock is already ticking
To influence your GRESB score, data must cover the full 2025 calendar year and data coverage alone can contribute up to 19.5 of the 100 available points. The more actual energy data you can gather, the better your chance of achieving a higher score.
It’s only August, but don’t let that lull you into a false sense of security. For a 12-month reporting period, GRESB allows up to two months of estimated data but only if you have at least 10 months of actual data. If you want to guarantee access to the entire 2025 dataset, you need to start now.
Why you should act before the end of year
While it’s technically possible to retrieve some data into early 2026, we recommend starting the meter matching process no later than October. This gives you time to:
- Submit your property list
- Complete the matching process
- Access metered data from January 2025 onwards
Leave it too late, and you risk missing the window for historic data retrieval.
Why GRESB reporting matters
GRESB drives global transparency and comparability across real estate sustainability. It helps investors identify market leaders and supports companies in aligning with net-zero strategies, managing assets more cost-effectively, and gaining a competitive edge. GRESB reporting also complements broader ESG frameworks and prepares participants for evolving regulatory expectations.
The challenges facing stakeholders
Data access remains the biggest barrier. Real estate firms often face three main hurdles:
- Data availability: Accessing tenant energy data can be tough without prior agreements or green lease clauses. Engaging tenants and coordinating with utility providers can delay or derail the process.
- Data quality: Raw consumption data often contains gaps or anomalies. For GRESB, you need data that’s continuous, accurate, and granular.
- Data coverage: GRESB assesses both area and time coverage. You’ll need data across all relevant properties, for a continuous 12-month period, a task that’s resource-intensive if done manually
The time to act is now
Our automated, fully compliant solution eliminates tenant disruption and manual chasing. You send us a list of addresses, and we match the property to its energy meter, and retrieve actual data from January 2025 onwards, in line with your reporting scope. By engaging with us in September or October, we can meter match and begin pulling 12 months of energy data for every asset, so by the time you submit to GRESB in 2026, you’ve got:
- Full-year actual data (with the option to estimate the final 1–2 months if needed)
- Supplier-specific and Scope 3-ready reporting
- A major step toward 100% data coverage
Trusted by industry leaders
“The process couldn’t have been simpler or clearer… accurate and complete actual energy and carbon emission reporting for some of our earliest developments.”– Social Impact and Sustainability Director, Sigma Capital
“We have gone from minimal energy data coverage to 100% in our first year; we look forward to expanding our relationship, leveraging arbnco’s capabilities to reduce our carbon footprint.” – Managing Director, Long Harbour
“arbnco has provided us with a cost-effective scalable solution to access energy data and supplier-specific carbon for our entire UK property portfolio supporting us on our journey to net-zero”– Director, Assura
Secure full-year energy data at limited time pricing
If you’re aiming for 100% GRESB data coverage for the 2025 calendar year, our recommendation is to secure access now, while historic data is still retrievable and pricing is locked.
