Telecom's Greenest Vendors Research Report 2026: Assessment of Sustainability Performance for 49 Telcos - Ciena, Cisco, Ericsson and Nokia Lead, While Chinese Vendors & Fiber Suppliers Lag

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• Supply chain accounts for 66% of telcos' total carbon emissions (scope 3 emissions)

  80% confidence

• Top 5 greenest vendors for scope 1 and 2 emissions intensity are Ciena, Spirent, Fortinet, Lenovo, and Accenture

  80% confidence

• Telcos shifting toward software-centric network operations can realize significant sustainability benefits

  80% confidence

• Chinese vendors and fiber suppliers lag in sustainability performance compared to leaders

  80% confidence

• When scope 3 emissions included, top 10 greenest vendors are nearly all software or services vendors: Accenture, Infosys, Amdocs, Tech Mahindra, TCS, HCL, Alphabet, Spirent, Microsoft, and CSG

  80% confidence

• Weighted average renewable energy adoption rate reached 45.2% in 2024, up from 39.5% in 2023 and 22.5% in 2019

  80% confidence

• Scope 1-3 emissions intensity dropped 19% in 2024 to 933 MT CO2e per million in revenue, falling below 1,000 for first time

  80% confidence

• 43 vendors consumed 216 million MWh of energy in 2024, representing 14% year-over-year increase

  80% confidence

• Energy costs are rising and volatile, making assessment of energy efficiency essential for telco success

  80% confidence

• Progress in sustainability is slow and telco NI vendors must take more sweeping, dramatic steps to lower carbon footprints

  80% confidence