Key takeaways
- Data centers need physically diverse fiber routes for resilience; a parcel can clear on land, power and tax incentives and still fail on route diversity.
- Light in fiber travels at roughly 200,000 km per second, so each 100 km of route adds about 1 millisecond of round-trip latency.
- NTIA's Enabling Middle Mile Broadband Infrastructure Program awarded nearly $980 million for more than 12,500 miles of new fiber across 40 states and Puerto Rico.
- One industry estimate cited by TelcoNews puts the cost of delay on a typical 60 MW data center project at up to $14.2 million a month.
- Fiber the QOZB buys new and installs inside the zone can count toward the 70% test; fiber outside the tract is owned property not used in the zone.
What fiber connectivity does a data center need?
At least two physically diverse, high-capacity routes into the site, with access to multiple carriers and to long-haul networks. Diverse means the routes do not share a conduit, bridge or right of way, so one backhoe cannot cut both. Proximity to high-capacity fiber routes, interconnection points and diverse paths reduces latency, supports higher throughput and improves resilience.9
- Laterals: the last segments from the site to existing fiber routes, often built new for a greenfield campus.
- Long-haul routes: regional and national backbones that carry traffic between markets.
- Inter-campus links: connections between a tenant's data centers. Kirkwood Infrastructure Group's CEO notes these links, which once ran 2 to 30 miles, can now run 250 miles or more, so long-haul routes act as inter-campus links.5
- Carrier access: a meet-me room where several carriers can terminate, so tenants are not tied to one provider.
Why is fiber harder in rural Opportunity Zones?
Because the sites that have land and grid headroom often lack dense, diverse route inventory. Data Center Knowledge reports that in emerging markets, last-mile and long-haul bandwidth often lag behind the needs of large-scale facilities, which complicates site selection, and that many carriers lack strong incentives to build beyond densely populated areas.6 Screen route diversity before paying for a land option, not after.
Demand is moving to exactly these places. JLL reports that 77% of North American development is in frontier markets such as West Texas, Ohio, Louisiana, Indiana and the Carolinas.13 Regional carriers see the opening: Shentel, with more than 19,000 route miles, says data centers moving away from metros for land and power could use its routes.7 Many rural Opportunity Zone (OZ) tracts also qualify for the enhanced rural incentives, including a 30% basis step-up for qualified rural funds and a 50% substantial improvement threshold.12 See rural data centers and Opportunity Zones.
Fig. 1Federal middle-mile fiber investment
How far can a data center be from a major market?
It depends on the workload. Light in optical fiber travels at roughly two-thirds of its speed in a vacuum, about 200,000 km per second, so each kilometer of route adds about 5 microseconds one way. Real routes are longer than straight lines, and switching adds more delay.
Fig. 2Approximate round-trip propagation delay by fiber route length
Illustrative- 50 km routeabout 0.5 ms
- 250 km routeabout 2.5 ms
- 500 km routeabout 5 ms
- 1,000 km routeabout 10 ms
Analysis: large AI training clusters and batch workloads tolerate distance from users far better than trading systems or interactive applications, which is part of why remote, power-rich sites have become viable. They still need very high capacity to other campuses and to the internet. Edge workloads are the opposite; see edge data centers in Opportunity Zones.
How do you check fiber at a candidate Opportunity Zone site?
Start with public tools, then get carrier route maps and quotes under a nondisclosure agreement. Public data shows where networks and interconnection facilities are, but not spare capacity or exact routes.
- FCC National Broadband Map: fixed and mobile broadband availability by location, a rough guide to which providers serve an area.1
- PeeringDB: a database of interconnection facilities, internet exchanges and networks, with facility data downloadable for mapping.2
- CAIDA AS Facilities dataset: a research dataset of interconnection facilities built from PeeringDB.3
- NTIA middle-mile awards: planned routes funded by the federal program, many still under environmental review.4
Fig. 3Fiber diligence for a rural OZ data center site
- 1
Screen
Public maps, PeeringDB, middle-mile awards
- 2
Route maps
Carrier maps under NDA; confirm physical diversity
- 3
Lateral design
Distance, rights of way, crossings, permits
- 4
Quotes and timing
Build cost, lead time, IRU or lit service
- 5
Contract
Signed before the main equity tranche
Time is money. A TelcoNews piece, citing STL Partners, says delays to a typical 60 MW data center project can cost as much as $14.2 million a month.8 For a project in the OZ working capital safe harbor, fiber delays also push spending later; see the Opportunity Zone data center development timeline.
How do the Opportunity Zone rules treat fiber assets?
By ownership, location and the form of the right. A Qualified Opportunity Zone Business (QOZB), the operating company that owns the data center, must have at least 70% of the tangible property it owns or leases be qualified zone business property used in a zone during substantially all of its holding period.10
- Fiber, conduit and meet-me room equipment the QOZB buys new and installs inside the tract is qualifying tangible property.
- Lateral fiber the QOZB owns that runs outside the tract is owned tangible property not used in the zone. It counts in the denominator of the 70% test but not the numerator. Treasury's FAQ treats property used in a zone on at least 70% of days as used substantially in the zone, which mainly helps mobile equipment, not fixed fiber outside the tract.11
- Lit services bought from a carrier are an operating expense, not property of the QOZB.
How is an IRU treated?
An indefeasible right of use (IRU) is a long-term right to use specific fibers in a carrier's cable, common in the industry. Analysis: depending on its terms, an IRU may be treated for tax purposes as a lease of tangible property, a purchase of tangible property or an intangible right. If it is leased tangible property, it can count under the leased property rules if on market terms; if it is intangible, it falls under the 40% intangibles test. There is no OZ guidance specific to IRUs, so get a tax opinion. See leased property rules for Opportunity Zone businesses.
Fig. 4Three ways to get fiber to an OZ data center
Built by the QOZB
Owned lateral and conduit
- Tangible property of the QOZB
- Qualifies only for the part inside the zone
- Highest upfront cost, most control
- Rights of way and permits on the schedule
Long-term right
Dark fiber IRU
- Often prepaid for a long term
- Tax character depends on terms
- Lease, purchase or intangible analysis
- Common for inter-campus routes
Bought as a service
Lit carrier service
- Operating expense, no property
- Fastest to procure where routes exist
- Outside the QOZB's tangible property tests
- Capacity limited by the carrier's network
Can fiber and interconnection support the QOZB's active business?
It can help. Analysis: a landlord QOZB that runs a carrier-neutral meet-me room, sells cross-connects and staffs network operations is providing services beyond a passive lease. That supports the case that it is actively conducting a trade or business, which matters because merely entering into a triple-net lease is not the active conduct of a trade or business under the regulations.10 Cross-connect and connectivity revenue for services performed at the facility should generally count as income from the business in the zone for the 50% gross income test, though this too is analysis.
For the lease side of that question, see data center lease structures in Opportunity Zones and colocation data centers in Opportunity Zones. For site screening that combines power, fiber and zone status, see data center site selection inside Opportunity Zones.
Common questions
How many fiber routes does a data center need?
At least two physically diverse routes is the common minimum for resilience, with access to several carriers. Large campuses often want more, plus high-capacity links to the tenant's other campuses.
Can a rural data center work for AI if it is far from cities?
Often yes for training and batch workloads, which tolerate distance from users. Each 100 km of fiber adds about 1 millisecond of round-trip delay, which matters more for interactive and edge workloads.
Does fiber outside the Opportunity Zone tract count for the 70% test?
Fiber the QOZB owns outside the tract is not used in the zone, so it counts in the denominator but not the numerator. Usually it is a small share of a data center's tangible property.
How is a dark fiber IRU treated under the OZ rules?
There is no specific guidance. Depending on its terms, an IRU may be a lease, a purchase or an intangible right for tax purposes, which changes which test applies. Get a tax opinion before relying on it.
Where can I see what fiber serves a rural site?
Start with the FCC National Broadband Map, PeeringDB and NTIA middle-mile awards, then obtain carrier route maps under a nondisclosure agreement. Public tools do not show spare capacity or exact routes.
Sources
Every numbered note in this guide links to the source below.
- 1.Federal Communications Commission, “How to Use the FCC's National Broadband Map,” n.d. help.bdc.fcc.gov
- 2.PeeringDB, “About PeeringDB,” n.d. peeringdb.com
- 3.CAIDA, “AS Facilities dataset,” n.d. caida.org
- 4.National Telecommunications and Information Administration, “Enabling Middle Mile Broadband Infrastructure Program,” n.d. ntia.gov
- 5.Data Center Frontier, “Scott Bergs, CEO of Kirkwood IG: Fiber and the AI Data Center Buildout,” 2026. datacenterfrontier.com
- 6.Data Center Knowledge, “Could Fiber Be the Next Big Bottleneck in Data Center Growth?,” n.d. datacenterknowledge.com
- 7.Lightwave, “Shentel sees incremental revenue potential with the rural data center movement,” 2026. lightwaveonline.com
- 8.TelcoNews US, “Why fibre connectivity must be a front-end consideration in data centre site selection,” 2026. telconews.com
- 9.Data Center Knowledge, “Urban vs. Rural: Why Data Centers Are Built Where They Are,” n.d. datacenterknowledge.com
- 10.Legal Information Institute, Cornell Law School, “26 CFR 1.1400Z2(d)-1, Qualified opportunity funds and qualified opportunity zone businesses,” n.d. law.cornell.edu
- 11.Internal Revenue Service, “Opportunity zones frequently asked questions,” n.d. irs.gov
- 12.Internal Revenue Service, “Treasury, IRS provide guidance for Opportunity Zone investments in rural areas (Notice 2025-50),” 2025. irs.gov
- 13.JLL, “North America Data Center Report Midyear 2026,” 2026. jll.com
This website is for general information only. It is not an offer to sell, or a solicitation of an offer to buy, any security. Any offering will be made only through confidential offering documents, to eligible investors, where permitted by law. Opportunity Zone tax benefits depend on each investor's circumstances and on rules that can change; consult your own tax and legal advisers.
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