SR 400 Peach Partners, a consortium led by Acciona Concesiones and ACS Group subsidiaries Iridium Concesiones de Infraestructuras and ACS Infrastructure Development, has achieved financial close for the SR 400 Express Lanes project in Georgia
This milestone marks the largest public-private partnership (P3) bond financing in U.S. history, initiating a nearly 56-year DBFOM (Design-Build-Finance-Operate-Maintain) concession to deliver groundbreaking transportation infrastructure
SR 400 Express Lanes – Project Details
The SR 400 Express Lanes project involves the design, construction, financing, operation, and maintenance of approximately 16 miles (26 km) of new express lanes along State Route 400, one of Atlanta’s most heavily traveled commuter corridors.
The works will add two express lanes in each direction between the North Springs MARTA Station and McGinnis Ferry Road, and one express lane in each direction from McGinnis Ferry Road to McFarland Parkway. These lanes will operate under a dynamically priced toll system, providing motorists with more reliable travel times while improving traffic flow in the region.
The project scope also includes reconstructing or widening bridges, upgrading interchanges, and implementing intelligent transportation systems (ITS) for tolling, traffic management, and safety monitoring.
SR 400 Peach Partners
The SR 400 Express Lanes are being delivered as a Design–Build–Finance–Operate–Maintain (DBFOM) public-private partnership (P3) under a 56-year concession agreement with Georgia Department of Transport (GDOT).
SR 400 Peach Partners brings together:
Equity & Concession Sponsors: Acciona Concesiones S.L.; ACS Infrastructure Development, Inc.; Meridiam SR-400, LLC
Design–Build Contractor: Acciona Construction USA Corp. and Flatiron–Dragados joint venture (50/50)
Lead Engineer / Design: Parsons Transportation Group
Toll Systems Integrator: Indra USA
Operations & Maintenance / Toll Operations: Meridiam SR-400, LLC (lead O&M and toll operator) in partnership with Acciona Concesiones and ACS Infrastructure
Financial Close - Details
Under the consortium name SR 400 Peach Partners, ACS Infrastructure, Acciona Concesiones, and Meridiam have achieved financial close on the SR 400 Express Lanes Project with one of the largest transportation P3 financing packages in U.S. history.
The financing package includes:
A low-interest USDOT TIFIA loan, marking the largest single TIFIA loan ever issued.
Tax-exempt Private Activity Bonds (PABs) priced in the U.S. capital markets, representing the largest P3 bond financing in the U.S. market.
Equity contributions from each sponsor, with each holding a 33.33% stake. These contributions are fully backstopped by letters of credit at financial close, supporting the 5.5-year construction program.
The total capital investment is valued at US $10.99 billion, covering US $4.6 billion in design-build construction costs as well as an upfront concession fee of US $3.8 billion payable to the Georgia Department of Transportation (GDOT) and the State Road and Tollway Authority (SRTA).
Design and construction will be carried out by a 50/50 joint venture between ACS Group’s U.S. civil construction arm, FlatironDragados, and Acciona. Both firms have a proven track record in delivering large-scale, complex transportation infrastructure across North America, bringing advanced engineering solutions, efficient project execution, and deep expertise in heavy civil works.
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