For years, sustainability in digital infrastructure lived mostly in boardroom decks and annual ESG reports. Telecom companies talked about carbon targets, circularity, and net-zero ambitions — but what happened on the ground often told a different story.
Today, it is being pulled into contracts, audits, and board-level risk conversations.
That shift is happening fast. McKinsey’s 2025 Infrastructure report shows that more than 40% of global RFPs now contain explicit sustainability clauses. Sustainability is no longer just something companies say. It is something they must prove.
Nowhere is this more visible than in fibre deployment. As AI, cloud, and data-driven services push networks to expand at unprecedented speed, sustainability is being tested not by ambition, but by execution.
What gets specified, what gets built, what gets measured — and what gets reported — is what now matters.
The execution gap ESG still misses in fibre builds
Even with stronger ESG language, there remains a significant gap between policy and on-the-ground practice.
In typical fibre deployments, 5–10% of material is lost to over-ordering, spool overruns, and excess cabling. That waste represents cost, but it also represents embedded carbon — emissions already locked into the glass, plastic, transport, and handling of fibre that never ends up being used.
Yet most sustainability reporting does not capture this. It shows high-level emissions, not the operational inefficiencies that quietly drive them.
This is why the industry is moving towards something more demanding than “green” projects. It is moving toward measurable sustainability — builds that can be audited, reconciled, and verified.
Three levers that actually move the needle
1. Waste reduction through build discipline
The simplest sustainability gains often come from tighter operational control:
● More accurate coverage planning and spool reconciliation to prevent over-ordering
● Packaging standards that reduce site-level waste and disposal costs
● Reel and drum return programs written into contracts, with compliance tracked
When material flows are visible and accountable, waste reduces — and so do emissions.
2. Circularity by design, not by exception
True circularity does not rely on good intentions. It is built into how projects are specified and delivered:
● Recyclable materials defined at the design stage
● Reusable reels and return logistics treated as standard, not optional
● Take-back and reuse pathways agreed contractually, with clear ownership
This turns circularity from a pilot into a system.
3. Route and duct optimisation to cut embedded carbon
One of the biggest sources of emissions in fibre rollouts is not the cable — it is the civil works. A reuse-first mindset makes a measurable difference:
● Prioritising existing ducts, poles, and corridors before new trenching
● Reducing civil works intensity, often the largest carbon driver in a build
● Minimising disruption, delays, and permitting friction
Less digging means less concrete, less transport, and fewer emissions — with faster deployment to match.
This new phase of ESG is defined by proof, not promises.
Operators, hyperscalers, and investors increasingly expect sustainability to show up in delivery data.
That means:
● Converting sustainability levers into KPIs such as waste percentage, return rates, reuse levels, and civil works avoided
● Using supplier scorecards to drive continuous improvement across programmes
● Treating sustainability evidence as part of project close-out and handover, not a side report
In this model, sustainability becomes part of network performance — just like uptime, latency, or cost.
Sustainability as a core network capability
The next phase of infrastructure sustainability will not be defined by declarations. It will be defined by discipline.
Fibre rollouts show that when ESG is embedded into specifications, contracts, and delivery metrics, it becomes resilient — even under cost pressure and audit scrutiny. It stops being a trade-off and starts becoming a competitive advantage.
In a world where every kilometre of fibre must justify its cost, carbon, and credibility, sustainability that survives procurement is sustainability that lasts. And that is where the future of responsible network building now sits.
Shweta Agarwal
Shweta Agarwal is Business Head at STL.
