Renewable Energy Credits/Green Certificates (RECs) is a policy instrument which provides evidence that an electricity generator has produced a certain quantum of power from a renewable energy source.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/green-certificates-european-countries
[2] http://admin.indiaenvironmentportal.org.in/category/author/namrata-mukherjee
[3] http://admin.indiaenvironmentportal.org.in/category/journal/inwind-chronicle
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/power-industry
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/netherlands
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sweden
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-kingdom-uk
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/european-union-eu