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Metro fight against global warming, cuts 90,000 tns of CO2 emission
New Delhi | Sunday, Feb 22 2009 IST
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The Delhi Metro, the first railway project in the world to be registered for carbon credits by the United Nations, have received a UN certificate for preventing over 90,000 tonnes of carbon dioxide from being released into the atmosphere by reducing its power requirement, thus contributing to the fight against global warming.

The certification report was given by Germany-based validation organisation TUV NORD which conducted an audit on behalf of United Nations Framework Convention on Climate Change (UNFCCC), a DMRC release said. The DMRC was found to have restrictesd the emission of 90,004 tonnes of carbon dioxide from 2004 to 2007 by adoption of regenerative braking systems in the Delhi Metro trains.

Under this regenerative braking process for which DMRC earned carbon credits, whenever trains on the Metro network apply brakes, three phase-traction motors installed on these trains act as generators to produce electrical energy which goes back into the Over Head Electricity (OHE) lines. The regenerated electrical energy that is supplied back to the OHE is used by other accelerating trains in the same service line, thus saving overall energy in the system as about 30 per cent of electricity requirement is reduced.

The DMRC also claims to have saved 1,12,500 megawatt hours of power by restricting and reusing power on its trains through regenerative braking, thus saving the emission of 90,004 tonnes of carbon dioxide into the atmosphere from 2004 to 2007. It is estimated that in 2008, release of 39,000 tonnes of CO2 was prevented and this figure will increase to over 100,000 tonnes per year once Phase-II of the Metro project is fully operational.

-- (UNI) -- 22DI18.xml

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