The Honolulu rail authority says the cost of the rail system is now at $9 billion.
The latest estimate was included in the HART's recovery plan, which was filed with the Federal Transit Administration on Friday.
It includes $8.2 billion in construction costs and another $858 million in financing costs.
The partially built rail line is years behind schedule and way over budget.
The original price tag was $5.26 billion in 2014. The final cost is expected to be nearly $10 billion, including financing costs.
The FTA needs to approve the plan before it releases federal funds.
Copyright 2017 Hawaii News Now. All rights reserved.
See all our reports and web extras on the Honolulu Rail Transit project.
PHOTOS: Child's wish comes true at Foster Botanical Garden
PHOTOS: Zoo's new 'reptile house' opens
PHOTOS: Sand sculptures in Waikiki
PHOTOS: Hawaiian Air welcome first Airbus A321neo
PHOTOS: Honolulu City Lights Christmas tree arrives