That an efficient public transportation system would be one of the most effective solutions for reducing urban CO2 emissions was common knowledge. But in Santiago, Chile the choice has been made to go above and beyond by generating 60% of the energy to power its metro system from renewable energy sources. In the world of Chilean President Bachelet: "Over 2 million Chileans use the metro every day. In this way, they will be able to travel with a means of transportation that is good for the planet, that reduces out impact on the environment and that will make possible a more sustainable future for everyone". This ambitious plan set to be completed by 2018, includes the construction of a solar power plant, with a 100 Mw capacity, which will be built by the California company Sun Power owned by the oil major Total which will supply 42% of the necessary power and a wind farm with a 185 Mw capacity by the Spanish company Elecnor will contribute the remaining 18%. The energy generated by these 2 plants will result in the decrease of CO2 emissions by 130,000 tons a year. The metro in Santiago, which features 5 lines and over 100 stations, is the second largest in South America but will be the first in the world in terms of its green nature.