You Reorganized Your Whole Build Around Power. Fiber Is Next.

The largest AI buyers are now reserving fiber years ahead of campus construction, much as they already do with power. It’s one of the clearest signs that fiber is becoming a critical constraint on digital infrastructure growth.

By Marty Panega, Senior Account Director, Neocloud and Superscale, Lightpath

Ten years ago, power was the easy part of a data center build. You picked a market for its network and workforce, then brought in power like any other utility. Today, that playbook is obsolete.

Demand for power outran supply, grid interconnection queues stretched into years, and securing megawatts went from a late-stage requirement to one of the first commitments a developer had to make. Developers rebuilt their entire strategy around it, and today a site is chosen for its power capacity above all else. As CBRE noted, power availability, not market demand, is now the ultimate gatekeeper of digital infrastructure.

The industry has already lived through that shift. Fiber is now moving in the same direction.

Secure fiber long before breaking ground

The major AI players are no longer treating fiber as a late-stage utility hookup. Over the last 12 months, some of the industry’s largest buyers have made multi-billion-dollar commitments to secure optical supply and route access years in advance:

• Cable pre-orders: Meta ($6B with Corning through 2030) and Amazon (multi-billion Corning supply deal) have pre-bought raw cable production capacity.
• Route leases: Microsoft ($8B+ in dark fiber) and Google ($1B+ with Verizon) have locked down active and planned route paths.

Reserving physical inventory and high-count routes before campus construction represents a fundamental change in strategy. The message is clear: major buyers increasingly see early access to fiber and routes as necessary to protect future network capacity.

The supply constraints driving the shift

The supply chain reinforces the point. A fiber cable order that took just a couple of months in 2023 now carries lead times approaching a full year. At the same time, an AI campus consumes roughly 36x the fiber density of a conventional server hall.

Corning is directing manufacturing capacity toward hyperscaler-grade fiber, tightening supply for smaller buyers. The critical takeaway for data center developers: if you aren’t one of those hyperscalers, you are the smaller buyer in that sentence.

This is what a real infrastructure constraint looks like. Developers who continue to treat fiber as a late-stage line item risk:

• Exhausted supply queues: Lead times stretching beyond initial project milestones.
• Escalating premiums: Higher prices for lower strand counts or less optimal routes.
• Delayed time-to-market: Facility live dates moving to accommodate optical supply rather than tenant demand.

Treating fiber like power means reserving it before the build is ready

Acting on fiber scarcity requires a fundamental shift in project timing. Consider what a high-capacity power connection requires. Bringing a campus drawing hundreds of megawatts onto the grid can involve an interconnection request, engineering studies, and years of transmission work.

That long runway is why developers no longer wait for a signed tenant to enter the grid interconnection queue. Developers file early to secure their place in line, often before a tenant is committed. Fiber is beginning to demand the same approach. Securing high strand count fiber and long-haul routes can no longer be contingent on a signed lease if you want to deliver on schedule.

The modern fiber build lifecycle

Fiber delivery involves more than ordering cable. Several elements can extend the deployment timeline:

• Rights and permitting: Navigating right-of-way permissions, municipal permits, and complex crossings.
• Physical civil works: Managing trenching, conduit placement, splicing, and redundant path construction.
• Multi-carrier coordination: Securing seamless handoffs across regional network boundaries.

With cable lead times alone approaching a year, physical delivery can become a major schedule constraint. Developers who wait until a building is nearly complete to secure fiber risk shortages, higher costs, and missed delivery dates.

Hyperscaler leases don’t solve the last-mile gap

Even when a hyperscaler has secured backbone capacity, the developer still has to solve the local delivery problem:

• Backbone vs. access: National fiber reservations secured by hyperscalers do not cover the local permitting, right-of-way, and physical interconnects required for campus delivery.
• Consolidated execution: A network partner can simplify off-footprint deployment by coordinating carriers, interconnections, and local delivery.
• Capital allocation: Treating fiber like power requires a commitment to lock in route capacity early in the capital budget, well before lease execution.

Rethinking your sequence

If you are building an AI campus, power has already moved to the front of your development playbook. The question now is whether fiber is still sitting at the back — treated like a routine utility — while the market increasingly treats it as infrastructure that must be secured early. The world’s largest buyers are already answering that question with their checkbooks, securing supply and routes years ahead of demand.

That is the conversation data center developers should be having now. If you’re evaluating where fiber belongs in your development sequence, reach out to the Lightpath Major Infrastructure Solutions team or connect with me directly on LinkedIn.