California initiated its Middle-Mile Broadband Initiative (MMBI) in July 2021 with $3.25 billion in funding authorized by Senate Bill 156. On April 2, Governor Newsom announced that the first portion of the network would be activated and ready to provide wholesale broadband access.
MMBI is an extensive fiber network that stretches across the state, as shown on the map below. What’s not obvious on this map is how the network reaches throughout cities like Los Angeles to reach underserved and low-income neighborhoods.
The first live customer on the network is the Bishop Paiute Tribe located at the base of the Sierra Nevada Mountains in Inyo County. The Tribe is the recipients of a grant to build last-mile fiber funded by an NTIA Tribal grant. The connection to the MMBI network brings the backbone bandwidth to support the local network, and the fast speeds on the fiber network were immediately activated by the live connection to MMBI.
The bill authorized various parts of the state government to coordinate the construction of MMBI:
- CENIC Middle Mile Broadband Initiative, LLC was authorized to be a third-party administrator to manage the development, construction, maintenance, and operation of the network.
- The California Public Utilities Commission (CPUC) works with CENIC to determine the routes and access points on the network.
- Caltrans will manage construction along state highways.
- The Middle-Mile Advisory Committee (MMAC) was created to oversee the project and to advise on issues like the rates charged for connections on the network.
MMBI differs from state-owned networks in many states in that its goal is to provide affordable affordable backbone connectivity to ISPs, municipalities, Tribes, and others who want to provide last-mile broadband or cellular service. Many statewide fiber networks were built to provide broadband to government buildings and anchor institutions, but don’t allow middle-mile to be used for commercial purposes. I hope that States might look at what California has one and will open up their State fiber networks to provide affordable backhaul.
The network shown on the map above is the first phase. The state is open to proposals for joint construction with other entities to continue to expand the network to additional communities.
The $3.25 billion of spending, just within California, shows the inadequacy of the $1 billion middle-mile grant program authorized by Congress as part of the Infrastructure Investment and Jobs Act. Lack of affordable fiber middle-mile is still a glaring issue throughout rural America, and California is to be lauded for starting to solve this issue in the state.








