To maintain the service quality of Delhi Metro, NITI Aayog has requested the Prime Minister's office to raise fares of Delhi Metro. It said that the unchanged price in seven years could impact the quality of the capital's public transport, report said.

The published report said that NITI Aayog's vice chairman Arvind Pangariya wrote a letter to PMO,in which he wrote, "At the current level, the fares are inadequate for the provision of high quality services and maintenance".

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Pangariya also made a request to PMO to jointly review the matter with the Union urban development ministry. The last fare revision was done in 2009.Since 2009, the cost of electricity has witnessed more than 90 per cent hike. Of all the Metro operating cost, the power bill alone accounts for almost 30 per cent.

"There is considerable evidence pointing to the fact that without such increases, Metro service and physical infrastructure deteriorate, over time," Panagariya wrote in his letter.

The DMRC, in 2015-16 suffered the net loss of Rs 708.5 crore, the ministry informed the parliament.