How Sustainable Is Your Broadband? Green Providers Compared (2026)

The internet accounts for around 2–4% of global carbon emissions — similar to the aviation industry. In the UK, streaming a 4K film uses approximately 1 kWh of energy. FTTP networks are more energy-efficient than copper FTTC infrastructure per gigabit delivered, and several UK ISPs now run on renewable energy or hold B Corp certification. Cuckoo and Zen Internet are among the most sustainability-focused providers in the UK market.

The Carbon Footprint of Broadband

Broadband's carbon footprint comes from three sources: the energy used by the network infrastructure (exchanges, cabinets, data centres), the energy consumed by equipment in your home (router, ONT, set-top boxes), and the manufacturing and disposal of hardware. FTTP infrastructure uses significantly less energy per megabit than legacy copper ADSL or FTTC — a full-fibre network consumes roughly 85% less energy per gigabit than equivalent copper infrastructure. Hyperoptic and Community Fibre both operate pure-fibre networks in London and have published carbon reduction commitments. Your home router uses around 5–10 watts continuously — approximately 44–87 kWh per year, costing around £12–£24 at current energy rates.

B Corp and Certified Green Providers

Cuckoo is the UK's only B Corp certified broadband provider as of April 2026. B Corp certification requires a company to meet rigorous standards of social and environmental performance, accountability, and transparency. Cuckoo offsets its operational emissions and uses renewable energy for its network operations. Zen Internet powers its UK data centres with 100% renewable electricity and has committed to becoming carbon net-zero by 2030. Zen has held Investors in People Gold accreditation and publishes an annual sustainability report. Both providers use FTTP infrastructure, which is inherently more energy-efficient than copper alternatives.

What the Major Providers Are Doing

BT Group has committed to a net-zero carbon target for its direct operations and supply chain by 2030, and has already reduced its carbon intensity by 80% since the mid-1990s. BT's full-fibre rollout is partly justified internally on energy efficiency grounds — the company estimates FTTP will save 50,000 tonnes of CO2 annually versus maintaining copper. Virgin Media O2 has committed to net-zero operations by 2025 and published detailed emissions data. Sky has pledged to become net zero by 2030. However, large providers typically report Scope 1 and 2 emissions (direct and energy) without fully accounting for Scope 3 (supply chain and customer device usage).

How to Reduce Your Broadband Carbon Footprint

Individual actions that reduce broadband-related emissions include: switching off the router at night (saves up to 44 kWh/year, though this disrupts connected devices and automatic backups), selecting lower streaming quality for background listening, extending the life of home hardware rather than upgrading annually, and choosing a provider that uses renewable energy. Upgrading from FTTC to FTTP also reduces energy consumption, as ONTs use less electricity than street-cabinet electronics. Choosing a provider with a clear sustainability policy and published emissions data — such as Cuckoo or Zen Internet — allows you to hold them accountable.

Compare Broadband Deals at Your Address

Switching to a Full Fibre provider with a sustainability commitment can reduce both your bill and your environmental impact. Enter your postcode to compare available providers and see which FTTP options are available at your address.

Frequently Asked Questions

Is FTTP broadband more environmentally friendly than FTTC?

Yes. Full fibre (FTTP) infrastructure consumes significantly less electricity per gigabit delivered than copper-based FTTC. Removing the street cabinet electronics (which run 24/7) and replacing copper with glass fibre reduces network energy consumption substantially.

What does B Corp certification mean for a broadband provider?

B Corp certification requires a company to achieve a minimum score of 80 points across environment, workers, community, customers, and governance criteria, independently verified by B Lab. It is a meaningful third-party endorsement rather than a self-declared commitment.

How much energy does my router use?

A typical home router uses 5–10 watts, equivalent to approximately 44–87 kWh per year running continuously. At a UK average electricity rate of around 25p/kWh, that costs £11–£22 annually. Older or more powerful routers may use up to 15W.

Related Guides

FTTP: When's the Right Time to Upgrade · Types of Broadband in the UK: The Complete Guide · How to Make the Most of Your Broadband When Working from Home · Cuckoo Broadband Deals · Zen Internet Fibre Broadband Deals

Methodology

This guide is based on publicly available data from Ofcom, provider websites, and independent sources including ISPreview.co.uk, Thinkbroadband, and Point Topic. Pricing, speeds, and availability were verified in April 2026 and are subject to change. CompareFibre is editorially independent — providers do not pay for placement or influence our recommendations.