The Copenhagen Centre on Energy Efficiency (C2E2) serves as the Energy Efficiency Hub of the UN Secretary General's Sustainable Energy for All (SE4All) initiative and plays a leading role in advancing one of the targets - to double the improvement rate of energy efficiency by 2030. The initiative is a global multi-stakeholder partnership between governments, the private sector, and civil society.

C2E2 was jointly established by the Danish Government, the United Nations Environment Programme (UNEP), and the Technical University of Denmark (DTU) in 2013, building on the successful partnership established around the UNEP-DTU Partnership.

The Copenhagen Centre’s Knowledge Management System (KMS) engages stakeholders in energy efficiency initiatives through knowledge sharing and outreach. The KMS provides users with access to selected information, reports, publications, and databases on energy efficiency. The KMS is a one-stop shop for energy efficiency that is linked to many other related initiatives.

By clicking “User Content” users can contribute content and create collections in relation to Web Resources, Tools, Publications, Funding, News, and Events.

The KMS provides selected information on relevant websites, initiatives, and opportunities. In addition users can contribute information in relation to energy efficiency in various sectors including transport, industry, equipment and appliances, lighting, buildings, district energy, finance, and the power sector. Users can also submit their interest to "Become an Expert" in selected sectors, which allows interested parties to contact them for collaborative opportunities.