This primer provides an overview to key issues in energy efficiency financing. It lays out the barriers that currently exist for building owners in accessing financing and explains existing traditional financing options as well as emerging energy efficiency-focused financing mechanisms. It also explains how city policymakers can develop a plan to expanding energy efficiency financing options for both public and private buildings and lists best practices used by other cities.

This resource is part of the City Energy Project Resource Library. Launched in 2019, the library is the culmination of 6+ years of work on the ground in 20 U.S. cities to reduce energy use in large buildings. The City Energy Project is a joint project of IMT and the Natural Resources Defense Council (NRDC). For more information, visit

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