Sydney's troubled light rail project is at least a year behind schedule, Transport Minister Andrew Constance has been told by the consortium building the project.
The light rail running from the CBD to the eastern suburbs was meant to be finished in 2019 but it's now understood Mr Constance was advised by contractor ALTRAC on Thursday the new completion date was March 2020.
The news comes less than a week after the state government was taken to court by Spanish subcontractor Acciona, which is the firm building the $2.1 billion project.
Acciona has accused Transport for NSW in the NSW Supreme Court of engaging in "misleading or deceptive conduct" in relation to the contract.
The company wants another $1.1 billion from the government, which is fighting the claim.
The light rail was originally budgeted to cost $1.6 billion before a $500 million blowout.
Acciona's new demands threatens to double the original cost.