Data center energy and emissions reporting

Data centers have become one of the fastest growing loads on the grid, and reporting standards are catching up quickly. The IEA estimates that data centers used about 415 TWh of electricity in 2024, roughly 1.5 percent of global consumption, and projects that figure to roughly double to around 945 TWh by 2030. That growth, near 15 percent a year, is why energy and emissions reporting for these facilities is under a spotlight. This article covers the metrics that matter and how to report them without hand-waving.

Start with the energy metric: PUE

Power Usage Effectiveness (PUE) is the industry's core efficiency metric. It is the ratio of total facility energy to the energy delivered to IT equipment. A PUE of 1.0 would mean every watt reaches the servers with nothing spent on cooling, lighting or losses. Real facilities sit well above that. The Uptime Institute's 2024 Global Data Center Survey reported an industry average PUE of 1.56, only slightly better than the 1.58 recorded in 2023, and roughly flat for five years running.

PUE is only as good as the metering behind it

PUE is a ratio of two measured quantities: total facility energy and IT load. If either is estimated, stitched from partial submeters, or read at the wrong interval, the ratio is not trustworthy. Reliable PUE reporting depends on clean, time-aligned meter data for the whole facility and the IT load, which is exactly the kind of data that arrives messy from bills and building systems.

The emissions metric: Scope 2, both ways

Because data centers are dominated by purchased electricity, their footprint is mostly Scope 2. The GHG Protocol Scope 2 Guidance requires two figures. The location-based figure uses the average emissions intensity of the local grid. The market-based figure reflects the electricity products a facility has contracted, such as renewable energy certificates or power purchase agreements. Sustainability disclosures for data centers increasingly report both location-based and market-based Scope 2, and the gap between them tells the reader how much of the clean-energy claim rests on contracts rather than the physical grid.

• Location-based Scope 2: facility electricity multiplied by the local grid emission factor
• Market-based Scope 2: reflects contractual instruments (RECs, PPAs, supplier-specific factors)
• Report both, and be explicit about which instruments back the market-based number

For more on the split, see our explainer on market-based versus location-based Scope 2 and how electricity emission factors are chosen.

Water is now part of the story: WUE

Cooling makes water a reporting metric in its own right. Water Usage Effectiveness (WUE), introduced by The Green Grid, is the ratio of annual site water use in liters to IT energy in kilowatt-hours. The Green Grid's WUE white paper defines both a site metric and a source metric, the latter of which accounts for the water consumed off-site generating the electricity the facility uses. As with emissions, the on-site number understates the full footprint, because power generation upstream also consumes water.

A practical reporting checklist

Every row in that table starts with the same raw material: accurate, time-aligned energy and utility data for the facility. Standards define the ratios, but the inputs come from bills, interval meter feeds and submeters, and those rarely arrive clean.

Where MartinAI fits

Data center operators and their tenants often hold energy data across many bills, meters and formats, sometimes at five-minute interval granularity. MartinAI turns that into clean, validated, analysis-ready data tied to the right facility and meter, so PUE, both Scope 2 figures and WUE all draw from one consistent source rather than four hand-built spreadsheets. You keep the reporting; we make sure the numbers underneath reconcile.