The body, which owned Delhi Airport Metro Express Private Limited (DAMEPL), had written a letter to Delhi Metro Rail Corporation (DMRC) on June 27 expressing its inability to continue operations of the line.
DMRC has, however, rejected the notice given by Reliance Infra, terming the move as a "violation" of the concession agreement and the ongoing arbitration proceedings. It though has decided to take over the operations of the 22.7 km-long link from today.
Sources said this could translate to Rs 2800 crore though Reliance Infra did not specify the amount.
It argued that the termination has arisen owing to DMRC's event of default.
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It further said that despite the lapse of nine months and repeated requests by DAMEPL, DMRC failed to make alternate arrangements for taking over the operations of the metro line, even after the termination of the concession agreement in October 2012.
It contended that DAMEPL's claims for the termination payment are fully justified and enforceable, and Reliance Infra is confident of recovering its entire investment in DAMEPL.
The Airport Metro line, which is the country's first Public Private Partnership (PPP), has had a tumultuous run beset with controversies after it began operations in February 2011.
Before the suspension of services, the ridership hovered around 20,000 to 21,000 per day but after the resumption, the ridership was nearly halved to around 10,000.