Adding yet another feather to its cap, Delhi Metro has become the first rail network in the world to get a UN certificate for preventing over 90,000 tonnes of carbon dioxide from being released into the atmosphere, thus doing its bit to reduce global warming. The certification report, given by Germany-based validation organisation Tuv Nord that conducted an audit on behalf of the UN Framework Convention on Climate Change Change (UNFCCC), found that the Delhi Metro Rail Corporation (DMRC) stopped 90,004 tonnes of carbon dioxide (CO2) emission from 2004 to 2007 by adopting regenerative braking systems in the metro trains. Under regenerative braking process for which DMRC earned carbon credits, whenever trains on the Metro network apply brakes, three phase-traction motors installed on them act as generators to produce electrical energy which goes back into the over head electricity (OHE) lines. This regenerated energy is used by other accelerating trains in the same service line, thus saving overall energy in the system. DMRC saved 1,12,500 megawatt hours of power generation by restricting and reusing power on its trains through regenerative braking from 2004 to 2007. In 2008, about 39,000 tonnes of carbon dioxide were prevented from being emitted. This figure will increase to over 1,00,000 tonnes per year once phase-II of the Metro is fully operational. DMRC can also claim 4,00,000 carbon credits for a 10-year crediting period beginning December 2007 when the project was registered by the UNFCCC.
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