NTPC has tied up with Inland Waterways Authority of India (IWAI) to ensure smooth transportation of coal for the Farraka and Khelgaon projects as the railways network is congested and coal supply can be augmented through use of waterways given that the plants are situated near the Hooghly and the Ganga. The move was prompted by recurrent congestions on the railways network delaying coal supply to NTPC power plants. IWAI, on behalf of NTPC, has floated Requests for Proposal (RFP) for transporting three million tonnes of imported coal annually to Farakka, West Bengal, for seven years. The company which will be selected will have to develop the requisite infrastructure. The use of waterways is expected to start in 2012.