This article looks at what the supplemental round involves, the planning requirements it creates and how automated fiber planning software helps providers respond.
The supplemental round targets unserved locations that fell through the cracks during the first round of BEAD funding. Three categories of locations are covered:
NTIA will generate a Supplemental BEAD Eligible Location List for each state and set a funding ceiling based on the average cost per location from that state's approved Final Proposal. The Benton Institute's analysis estimates the process will take approximately nine months. Once the bidding window opens, states have 90 days to run the competitive selection process and choose winning providers. The notice is explicit that proposals will be scrutinized for excessive costs, and those exceeding reasonable per-location thresholds will be rejected.
For many fiber providers, the supplemental round arrives while round one builds are already underway. Engineering teams are occupied with existing deployments, and the supplemental round adds a parallel workload: identifying newly eligible locations, designing network extensions to reach them and producing cost estimates precise enough to meet NTIA's scrutiny.
Manual fiber planning processes present a challenge in this context. The engineering hours required to design coverage areas, model cost scenarios and produce build-ready outputs at the location level can take weeks for a single design iteration. When the goal is to evaluate multiple coverage areas across potentially several states within a 90-day bidding window, that timeline becomes difficult to sustain.
Many of the locations on the supplemental list are unserved precisely because they were expensive or difficult to reach. Producing designs that are both location-level accurate and cost-optimized enough to fall within NTIA's per-location thresholds requires careful engineering work. Without the ability to compare multiple design scenarios, planning teams are often limited to a single design per coverage area, with limited opportunity to identify the most cost-effective approach.
This is where automated fiber planning and design software changes the equation for providers preparing supplemental round proposals.
Comsof Fiber, IQGeo's automated fiber planning and design software, is used across the industry to design networks covering more than 100 million homes in over 50 countries. Its optimization algorithms automate the end-to-end planning and design process, producing location-level network designs in days rather than weeks.
For the supplemental round specifically, this speed advantage allows providers to evaluate and design for a much larger number of coverage areas within the 90-day window than would be possible with manual processes. Instead of committing to a single design per area, planning teams can model multiple scenarios and select the most competitive option before submitting a bid.
The supplemental round introduces new variables that make scenario comparison particularly valuable. Newly eligible locations may be in different geographies than a provider's existing footprint, with different cost profiles and infrastructure conditions. The question for each coverage area is not just whether it can be served, but which network architecture delivers the best cost-per-location outcome.
Comsof Fiber enables planning teams to quickly compare multiple network architectures, area costs and deployment approaches for each set of locations. The software supports every major fiber network architecture, focusing on FTTH and converged FTTH-5G, with design profiles for equipment from leading manufacturers and fiber equipment suppliers.
This flexibility allows providers to identify the optimal architecture for each coverage area rather than defaulting to a single approach.
NTIA has made clear that supplemental round proposals will be evaluated against strict cost-per-location ceilings. Comsof Fiber's optimization algorithms address this directly, reducing total build costs by up to 10% by eliminating design inefficiencies and making better use of existing infrastructure.
The software also integrates GIS and market data to produce designs that reflect real-world geography and serviceable locations, providing a defensible, auditable basis for cost estimates in supplemental bids. This level of design optimization and data-driven cost- modeling is an important factor in programs where per-location cost thresholds determine whether a proposal is approved or rejected.
Providers submitting supplemental round bids need to scale their planning output while keeping round one builds on track. Comsof Fiber's workflow templates allow newer engineers to replicate established design processes and adapt outputs for new coverage areas without building designs from scratch. This capability is particularly relevant for providers that need to expand their planning teams quickly to manage both workstreams.
Providers may also want to engage IQGeo's network of Certified Design Partners to supplement internal planning capacity during the bidding period.
While the supplemental eligible location lists have not yet been published, the structure of the process is now clear enough for providers to begin preparation. Assembling GIS data and infrastructure records for likely target areas, reviewing per-location cost averages from round one Final Proposals and ensuring that planning tools and team capacity are in place ahead of the 90-day window are all steps that can be taken now.
Comsof Fiber is designed for exactly this kind of large-scale, time-sensitive planning challenge. To find out how it can support preparation for the BEAD supplemental round, book a demo with our industry experts.