Believe it or not, Kolkata's energy efficiency has doubled since the turn of the century and is projected to increase by two times in the next 12 years.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/big-leap-kolkatas-carbon-neutral-dream
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kolkata
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy-efficiency
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/low-carbon-economy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electricity
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-mitigation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-economics
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change