Cloud Migration Cuts Network Emissions By Up To 96%, Independent Study Finds

Enterprises that move network and security services from on-premises hardware to Cloudflare's cloud can reduce related carbon emissions by as much as 96%, according to a new independent study from Analysys Mason. The bulk of those savings come from consolidation: shared cloud infrastructure runs at higher utilization than dedicated appliances, so more work gets done per watt consumed.

Cloudflare has also applied to the Science Based Targets initiative (SBTi) to set formal carbon-reduction goals across its own operations, facilities, and supply chain.

Why legacy network stacks are energy hogs

Traditional corporate networks bolt together dedicated circuits and a stack of specialized hardware — firewalls, intrusion detection systems, DDoS mitigation appliances, VPN concentrators, and more — in each data center or branch office. Those boxes sit idle most of the time. Engineers provision them for peak capacity, say a DDoS appliance rated for 10 Gbps of traffic, when typical traffic is only tens or hundreds of Mbps.

Specialized hardware is genuinely more efficient per watt at its specific function than a general-purpose server running mixed workloads. But that efficiency only matters when the device is running close to its rated capacity, which is rarely the case in corporate environments. The result is that most appliances consume near-peak power while doing a fraction of the work they could handle.

Running those functions on shared cloud infrastructure lets workloads ride on servers that stay busy with other traffic, pushing baseline utilization up and getting more useful output from the same energy draw.

Key findings from the carbon analysis

Analysys Mason compared the energy consumption of a typical enterprise hardware stack — network firewall and WAF, DDoS mitigation, load balancing, WAN optimization, and SD-WAN — against equivalent functions delivered over Cloudflare's global network. The study included representative devices at different capacity levels. Researchers found that higher-capacity boxes use only marginally more power than smaller ones, which further drags down utilization efficiency when big appliances sit under-loaded.

The study broke the emissions difference into three parts:

  • Raw processing efficiency favors purpose-built hardware, which consumes less power per request than a generic server doing the same job.
  • Utilization gains from shared cloud services flip the equation. Consolidated workloads keep servers busy enough that the efficiency penalty of general-purpose hardware is far outweighed by the gains from higher utilization.
  • A smaller boost comes from cloud data center infrastructure, including better power usage effectiveness (PUE) and lower carbon intensity than typical enterprise facilities.

Across several modeled environments, from small to large enterprise traffic profiles, total emissions reductions ranged from 78% to 96%.

The analysis deliberately excluded any credit for Cloudflare's renewable energy purchases or carbon offsets. Those would push the savings even higher: Cloudflare already runs on 100% renewable energy and buys offsets to cover its annual footprint. Enterprises retiring legacy gear can also factor in sustainable disposal; Cloudflare offers a hardware recycling program for end-of-life devices.

Cloudflare commits to science-based targets

Cloudflare has submitted its application to SBTi, which requires verifiable emissions reductions across a company's operations and supply chain without relying on carbon offsets. Reduction targets must align with the Paris Agreement goal of holding global warming to 1.5°C above pre-industrial levels.

If approved, Cloudflare will have 24 months to develop and validate its short- and long-term reduction targets with SBTi. The commitment extends existing pledges to 100% renewable energy, offsetting or removing historic emissions tied to powering its network by 2025, and reforestation programs.