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Scope 3 emissions from data centers are the value-chain emissions outside an operator’s Scope 1 and Scope 2 boundary. They can include the manufacture and transport of servers, construction materials, upstream energy emissions, outsourced services, waste treatment and leased assets. For a credible inventory, first establish who controls each facility and energy source, then map relevant activities to the GHG Protocol categories and collect data at the most useful level available.
Start with the reporting boundary—not the emissions factor
The same data-center activity can be classified differently depending on which company is reporting and how it defines its organizational boundary. Settle that question before assigning emissions to categories or asking suppliers for figures.
- Scope 1: Direct emissions from assets the reporting organization controls, such as fuel burned in its backup generators or refrigerant that leaks from equipment under its control.
- Scope 2: Emissions associated with purchased electricity, steam, heating or cooling.
- Scope 3: Other relevant emissions in the company’s value chain, upstream or downstream, outside its Scope 1 and Scope 2 boundary.
Document the legal entities and sites included, whether the company uses an operational-control, financial-control or equity-share approach, and how it treats joint ventures, shared facilities and leases. The GHG Protocol’s corporate-standard guidance and its Scope 2 guidance help clarify boundary questions.
Owned and operated facility
For an owned facility whose energy-consuming systems the company controls, generator fuel combustion is generally Scope 1 and purchased electricity is Scope 2. The upstream emissions of supplying that fuel and electricity may be Scope 3 Category 3. Construction materials and purchased servers may be Scope 3 even though the resulting facility and equipment are owned by the operator.
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Colocation tenant
A tenant’s electricity may be Scope 2 if the tenant purchases it. If a landlord controls the facility’s energy-consuming equipment or supplies energy as part of a lease, the treatment depends on the contractual arrangement and consolidation approach; it is not automatically Scope 3. Category 8, Upstream Leased Assets, may apply to assets outside the tenant’s Scope 1 and Scope 2 boundary.
Cloud provider or customer
A cloud provider accounts for emissions from the facilities and equipment within its boundary. A customer may account for purchased cloud services in Category 1, Purchased Goods and Services. That value-chain overlap is not automatically a mistake: the provider and customer are different reporting organizations. The problem is counting the same emissions twice within one company’s own inventory or failing to explain the allocation method. The GHG Protocol Scope 3 FAQ explains category and overlap principles.
Which Scope 3 categories are most relevant?
The GHG Protocol defines 15 Scope 3 categories, but a company should assess relevance rather than assume every category applies. For many data-center operators, Categories 1, 2, 3, 4, 5 and 8 warrant close attention. A provider that leases assets to customers may also need to assess Category 13; Category 11 or other downstream categories depend on what the company sells and its reporting boundary. The Scope 3 calculation guidance provides category definitions and methods.
| Category | Data-center examples | Useful starting data | Potential reduction lever |
|---|---|---|---|
| 1. Purchased goods and services | Maintenance, outsourced facilities management, security, cleaning, software, telecommunications, consumables and replacement parts | Supplier footprints, invoices, service activity and procurement records | Supplier requirements and lower-impact service contracts |
| 2. Capital goods | Construction materials, servers, networking equipment, UPS systems, batteries, generators, chillers, transformers and racks | Bills of materials, quantities, environmental product declarations and product carbon footprints | Lower-carbon design, procurement, repair and longer service life |
| 3. Fuel- and energy-related activities | Upstream fuel supply, upstream electricity emissions and transmission and distribution losses | Fuel and electricity use plus suitable upstream emission factors | Reduce energy demand and improve energy sourcing |
| 4. Upstream transportation and distribution | Inbound freight for equipment, construction materials, batteries and spare parts | Shipment weight, distance, mode and frequency | Consolidate freight and use lower-emission modes where practical |
| 5. Waste generated in operations | E-waste, batteries, packaging, construction waste, scrap and wastewater treatment | Waste mass and documented treatment pathway | Repair, reuse, refurbishment and verified recovery |
| 8. Upstream leased assets | Leased facilities or equipment outside the tenant’s Scope 1 and Scope 2 boundary | Lease terms, utility records and landlord data | Contractual data access and operational requirements |
| 13. Downstream leased assets | Provider-owned racks, servers or facilities leased to customers | Asset, customer-use and facility data, with a disclosed allocation method | Efficient operation and transparent customer allocation |
Category 1: Purchased goods and services
Include relevant services and operating purchases, such as maintenance, managed IT, cleaning, security, catering, purchased software and cooling supplies. Do not automatically put equipment or services in Category 1: whether a purchase is a capital good depends on what was acquired and the company’s accounting policy. Apply that policy consistently.
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Category 2: Capital goods
Construction and expansion can make Category 2 significant, as can purchases of servers, electrical infrastructure and cooling equipment. Under the GHG Protocol’s Scope 3 inventory approach, cradle-to-gate emissions from capital goods acquired during the reporting year are generally reported in that year; financial depreciation does not by itself determine when the emissions belong in the inventory. A company may use a separate lifetime allocation model for internal decisions, but should identify it as such. See the Category 2 calculation guidance.
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Category 3: Fuel- and energy-related activities
Category 3 covers upstream emissions not already included in Scope 1 or Scope 2, such as fuel extraction and delivery or upstream electricity supply-chain emissions. It is not a second count of electricity-generation emissions already recorded in Scope 2. For the distinction between energy scopes and value-chain treatment, consult the Scope 3 FAQ and calculation guidance.
Categories 4 and 5: Freight and waste
For inbound transport, identify the mode, distance, weight, shipment frequency and whether the transport is supplier-controlled or paid for by the operator. For waste, track the amount and destination of retired IT equipment, batteries, packaging and construction debris. Waste treatment is distinct from manufacturing emissions for replacement equipment: recycling an old server does not cancel out the emissions of producing a new one.
Categories 8, 13 and 11: Leases and downstream activity
Category 8 concerns leased assets used by the reporting company that fall outside its Scope 1 and Scope 2 boundary. Category 13 may concern assets owned by the reporting company and leased to customers, where the relevant emissions are outside the owner’s Scope 1 and Scope 2 boundary. Category 11, Use of Sold Products, is not automatically the right category for every cloud workload or data-center service. The appropriate treatment depends on the product or service, reporting company, transaction and applicable sector guidance. The GHG Protocol ICT Sector Guidance addresses ICT value-chain accounting.
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- Define the organization and boundary. List included entities, owned and leased sites, colocation arrangements, cloud services bought and sold, construction projects, and the chosen control or equity-share approach.
- Map data-center activities. Cover construction, electricity and fuels, cooling and refrigerants, hardware, maintenance, outsourced services, logistics, water and wastewater, leases, waste, and customer or workload allocation.
- Screen all 15 categories. Record each as relevant, not relevant, immaterial, relevant but unquantified, or included elsewhere under the selected boundary. Keep the rationale for exclusions.
- Prioritize material sources. Consider likely emissions, spend, influence, data availability, reduction potential, disclosure importance and double-counting risk. A construction project may be large but episodic; recurring server purchases may be easier to manage over time.
- Choose a calculation method. Prefer the best supportable supplier or physical activity data available, not the most elaborate-looking calculation.
- Record assumptions and data quality. Maintain the fields listed below so another reviewer can reproduce the estimate.
- Set a base year and restatement policy. Define how acquisitions, divestitures, new sites, outsourcing, methodology changes, better data and emission-factor updates affect comparisons over time.
Choose data that supports decisions, not false precision
A common calculation is emissions = activity data × emission factor. Examples include kilograms of steel multiplied by a steel factor, freight tonne-kilometres multiplied by a transport factor, electricity use multiplied by an upstream factor, or waste mass multiplied by a treatment factor. The GHG Protocol calculation-tools FAQ and its category guidance support method selection.
- Supplier-specific product or service footprint: Often most relevant to the purchase, but supplier boundaries and verification may vary.
- Activity-based calculation: Uses physical quantities such as material mass, energy use, shipment distance, waste weight or hardware units. It can illuminate operational levers but requires good records and suitable factors.
- Hybrid or average-data method: Combines supplier information with secondary factors or applies representative averages when product-specific data are unavailable.
- Spend-based estimate: Useful for a broad initial screen, but sensitive to prices, inflation, currency and procurement coding; it is less useful for measuring the effect of a specific engineering change.
For each source, retain the reporting period, geography, activity unit, supplier or factor source, factor version, gas coverage and global-warming-potential basis, lifecycle stages included, allocation method, primary or secondary data status, and uncertainty. Identify whether a figure is cradle-to-gate or includes transport, use and end of life. For electricity-related calculations, keep the Scope 2 basis and any Category 3 upstream factor distinct.
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Allocating shared cloud and colocation emissions
Providers may allocate shared infrastructure across workloads, customers, racks or services using physical measures such as IT electricity, CPU-hours, GPU-hours, server-hours, storage capacity and duration, data transfer, or allocated facility overhead. Physical drivers are generally more representative when reliable data exist; revenue allocation may be easier but can be less closely tied to resource use. No single formula is universally correct. State the chosen driver, system boundary, assumptions and uncertainty. The cloud-accounting methodology study discusses physical allocation factors.
Cloud workload estimates are especially sensitive to whether they include embodied hardware, cooling overhead, networking, storage duration, regional electricity, hardware lifetime and utilization. A workload figure without those boundaries is not directly comparable with another provider’s figure, and a generic average may miss the characteristics of a high-density GPU workload.
Use facility metrics as complements, not substitutes
- PUE (Power Usage Effectiveness) compares total data-center facility energy with IT-equipment energy. It is an energy-efficiency metric, not a measure of embodied carbon or total sustainability.
- WUE (Water Usage Effectiveness) helps describe operational water use; it does not capture every water impact in equipment or construction supply chains.
- CUE (Carbon Usage Effectiveness) relates carbon emissions to data-center energy or IT activity, depending on the method used. State the definition and boundary.
- ERF (Energy Reuse Factor) can describe recovered energy, such as waste heat reused outside the facility.
A lower PUE does not necessarily mean lower total emissions if IT demand rises or new equipment carries substantial embodied emissions. ENERGY STAR describes PUE and data-center benchmarking at its data-center resource page; the ITU data-center lifecycle guidance covers wider impacts and related indicators.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Reduce emissions across the data-center lifecycle
Procure equipment for its full useful life
Ask suppliers for product carbon footprints and their lifecycle boundaries, manufacturing geography, recycled content, energy performance, expected service life, repairability, modular design, spare-parts and firmware support, refurbishment options, take-back arrangements and evidence for environmental claims. Extend equipment life when reliability, security, performance and support requirements allow. A more efficient replacement is not automatically lower-carbon over its lifecycle if manufacturing the new equipment carries a substantial footprint.
Use a lifecycle comparison before deciding between new equipment and continued use. Consider expected energy savings, remaining useful life, utilization, embodied emissions, repairability, security, service support, reliability, resale or reuse options, and whether extra capacity could create rebound demand. The ITU procurement criteria also address energy efficiency, operating temperatures, airflow, modular UPS systems, cooling options, heat reuse and end-of-life management.
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Specify lower-carbon construction
For new facilities and major expansions, request material quantities and environmental product declarations, checking their boundaries and functional units. Evaluate lower-carbon concrete and steel, recycled materials, construction waste, adaptable design, suitable building reuse, modular construction and redundancy requirements. Prefabrication may reduce site waste or construction time, but transport, factory energy and material choices still matter. Compare whole-project impacts rather than assuming one construction method is always superior. The ITU lifecycle guidance includes embodied impacts from construction materials.
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Virtualization, server consolidation, power management, workload scheduling, removal of unused equipment, repair and reuse can reduce energy demand and the need for new hardware. Balance higher utilization against resilience requirements, cooling demand and equipment wear. Compare air and liquid cooling for the specific site and workload: liquid systems may support higher-density computing, but introduce equipment, coolant, maintenance, water, retrofit and end-of-life considerations. Neither is universally lower-carbon.
Control refrigerants and energy procurement
Track refrigerant purchases and leakage separately from cooling equipment manufacture, cooling electricity and equipment disposal. A leak from equipment the operator controls may be Scope 1; landlord-controlled equipment or purchased cooling services may be classified differently under the established boundary.
Renewable-electricity procurement is principally a Scope 2 matter, though it may affect Category 3 upstream calculations. Distinguish physical supply, contractual instruments, unbundled certificates, location-based and market-based factors, hourly matching and residual-mix accounting. Renewable procurement does not remove emissions from equipment, construction, freight, waste or other upstream activities.
Reduce freight and manage end of life
Consolidate shipments, avoid air freight where service requirements allow, maintain regional spare-parts inventories, coordinate construction deliveries and ask logistics providers to report emissions. Track expedited replacement shipments separately to identify avoidable demand.
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For e-waste, record equipment retired, refurbished and redeployed, resold, recycled, incinerated or landfilled; treatment destinations; transport; data-destruction methods; chain of custody; and recovery of batteries and critical materials. Ask what is actually recovered and where processing occurs rather than accepting an unqualified “recycled” claim.
Put expectations into supplier contracts
Procurement specifications and contracts can request product footprints, consistent lifecycle boundaries, supplier reduction targets, repair and take-back commitments, construction-material data, freight reporting, audit rights and data-quality disclosures. Make the requested unit, reporting period, verification expectations and allocation method explicit so supplier responses are usable.
Report emissions with enough context to act
Publish absolute Scope 3 emissions by category alongside the boundary, methods and data quality. Intensity measures can help diagnose efficiency, but should not replace absolute emissions: emissions per unit of compute may fall while total compute demand, equipment purchases or construction grows.
- Absolute Scope 3 emissions by category and material source
- Emissions per megawatt-hour of IT load and, where meaningful, per unit of compute or storage
- Embodied carbon per deployed hardware capacity and typical hardware lifetime
- Reuse, refurbishment and e-waste recovery rates, with definitions
- Supplier data coverage and share of emissions based on primary data
- Data quality, uncertainty, allocation methods and supplier dependencies
- PUE, WUE and CUE, each clearly defined and presented as complementary metrics
Separate real operational changes from boundary changes, improved supplier data, revised factors or methodology updates. A change from spend estimates to supplier-specific footprints can move reported emissions without any corresponding physical change; apply the base-year restatement policy consistently.
Quick Recap
Audit checklist for an operator or customer
- Have we documented entities, sites, leases, control approach and the reporting period?
- Have we screened all 15 categories and retained reasons for exclusions or estimates?
- Can each material source be traced to activity records, a supplier figure or an emission factor?
- Are capital goods distinguished consistently from purchased services and operating supplies?
- Are Scope 1, Scope 2 and Category 3 energy emissions separated without double counting?
- For leases and cloud services, have we explained the reporting perspective and allocation method?
- Do supplier footprints state lifecycle stages, geography, gases, functional unit and verification?
- Are waste quantities linked to documented treatment pathways and chain of custody?
- Are base-year, factor, boundary and data-quality changes handled under a stated restatement policy?
- Can procurement, facilities and finance teams identify an owner and reduction lever for each major source?
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