It also argued that coaches supplied by Hyundai Rotem were already in use on the Delhi Metro, as well as a few other metros. According to Metro officials, "The delay will impact integrated trial of coaches in Aluva-Palarivattom route, initially scheduled for August 2015. With re-tendering process on, the proposed integration of coaches with tracks, third traction (sourcing power from the third rail) and signal systems can be done only by 2015-end or early 2016." The DMRC held a pre-bid meeting in New Delhi on 2 April 2014 to allow interested firms to seek clarifications regarding technical specifications for the contract for the coaches. The re-tendering process was won by French company Alstom. The contract is for design, manufacturing, supply, installation, testing and commissioning of 25 standard track gauge trains with an option to supply 25 additional metro sets. Signaling The Kochi Metro is the first metro system in India to use a communication-based train control (CBTC) system for signalling and telecommunication. In addition to train sets, the signalling contract was also won by Alstom and will use Alstom Urbalis 400 CBTC signalling. In a CBTC system, the importance of signals is limited as "beacons" located along the corridor relay the precise position of trains to the operation control centre (OCC) at Muttom. The computerised OCC monitors and controls all train movements. CBTC also enables the use of driverless trains, although the Kochi Metro will initially use metro pilots during its operations. Power KMRL will acquire 20 MW of electricity, to operate the metro. The electricity will be supplied from the Kaloor substation of the Kerala State Electricity Board (KSEB). The DMRC was in favour of supplying power through 25 kV overhead power lines. This was opposed by the KMRL who preferred to source power from the third rail laid alongside the metro track. It was decided to supply power via the 750 V DC third rail. In January 2015, Alstom won the contract for manufacturing, supply, installation, testing and commissioning of the 750 V third-rail traction electrification and auxiliary substations (ASS) and associated SCADA systems. Under this contract, Alstom is also in charge of the supply, installation, testing and commissioning of 110 kV cabling incoming from the grid (incl. civil works), 2x GIS3; 110 kV Intake Power Substations and their associated Power Transformers 110 kV/33 kV, and 33 kV/415 V Auxiliary Transformers. In November 2016, KMRL began installing solar