Some big ISPs have big plans for more fiber expansion. I gleaned the following planned future fiber passings from various quotes from the ISPs in the second half of 2024. These ISPs have plans to build the following fiber passings by the end of 2029 or sooner.
- AT&T – 21 million
- T-Mobile/ Metronet – 3.5 million
- T-Mobile/Lumos – 3.4 million
- Frontier – 3 million
- Brightspeed – 1.7 million
- Verizon – 1.5 million
- Cox – 1 million
These numbers don’t count the plans of numerous smaller fiber overbuilders that have aggressive expansion plans.
The magnitude of these numbers amaze me because of the history of fiber overbuilding. The two biggest overbuilders have been Verizon FiOS and AT&T. Both companies have always been extremely cost-conscious in deciding where to build fiber.
Verizon was famous for its discipline about where it built FiOS. The company clearly had an internal cost target, and the D.C. suburbs are a patchwork of neighboring subdivisions with and without FiOS that can only be explained by looking at the cost per passing to build the fiber.
AT&T has done the same. I’ve followed AT&T’s expansion in various communities, and the company has built fiber over the last five years where the cost to do so was the lowest. A lot of the AT&T expansion was done by overlashing fiber onto existing copper telephone wires.
A few of the companies on the list above are following that same model. It seems likely that as Frontier and Brightspeed extend fiber in the legacy telephone areas, they will first build the areas with the lowest cost. I will not be surprised to find in a few years that these companies have built only those parts of communities where the construction costs are the lowest. That kind of discipline is the best use of limited capital dollars. Cox and other cable companies have the same option to expand fiber by overlashing on existing cables.
The expansion plan by AT&T perplexes me. Jeff McElfresh, AT&T’s chief operating officer was quoted in Fierce Network in December saying that the company has 29 million fiber passings at the end of 2024 and plans to grow to 50 million by the end of 2029.
It seems likely to me that the 29 million existing fiber passings were mostly done in neighborhoods with the lowest costs in the AT&T footprint. In my own city I’ve driven around and looked at AT&T’s claimed fiber passings, and most are overlashed onto copper wires. I assume AT&T has been using an expansion metric that considers the availability of overlashing plus the density of homes.
Over the years I’ve heard many folks who believe that the big ISPs build strictly based on demographics – and perhaps that is the third part of the AT&T equation on where to build. But I see AT&T fiber in neighborhoods with huge homes as well those with small bungalows. At least in this city, it looks like construction cost is more important than demographics.
Every overbuilder has its own business model and a target construction cost. I know smaller overbuilders who say they can’t make a business case if construction costs are more than $3,000 per passing. For years, AT&T and Verizon touted overbuilding costs below $1,000 per passing.
It seems to me that for AT&T to meet its target of 50 million passings it is now willing to spend more per passing than in the past. Perhaps that willingness is based on the success the company has in converting customers to fiber in overbuilt neighborhoods. It also seems likely that the company is banking on the economy of scale savings from increasing the size of the fiber business. AT&T now has a new motivation, which is to cut folks off copper to cut down on maintenance and backoffice costs. Maybe the net savings from shutting down copper networks is the new factor in the AT&T metrics for where to build fiber.
Only AT&T knows the details behind its decision to expand rapidly. I find it interesting that the company is suddenly willing to build fiber in neighborhoods that were not in its plans just a few years ago.





