Prime Minister Manmohan Singh had laid the foundation stone for the project on September 13 last year.
Chandy waved a green flag at the function at the Jawaharlal Nehru stadium as simultaneously, the piling work commenced at nearby Edapally.
The Chief Minister said this was a "proud moment" for the state which had waited for years for its dream to become a reality.
Urging everyone to pledge support for the project to ensure its completion within the stipulated time frame, Chandy said Delhi Metro Rail Corporation (DMRC) Principal Advisor, E Sreedharan had promised that the project would become a reality in 1095 days. But had also wanted that the metro work should not be affected even a single day.
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The Chief Minister said there have been demands from various quarters for the extension of the metro to the IT hub at Kakkanad, Tripunithura, Nedumbassery airport-Angamally and Mattancherry.
Chandy said the government has decided to ask the Kochi Metro to study the demands and submit a report in six months on the extension after which the Centre's consent would be taken to go ahead with it, he said.
Consultancy agreement with the DMRC would be signed within a week on the Rs 5000 crore Thiruvananthapuram-Kozhikode Monorail project. By August this year, the Mono rail work will commence, he said.
The centre's share is Rs 1002.23 crore (about 19.3 per cent of total project cost while the state's share is Rs 2009.56 crore (about Rs 38.7 per cent) while loan from funding agencies is Rs 2170 crore (about 42 per cent).