DOE has supported the development of several combined heat and power (CHP) databases that have proven to be "go-to" resources for end users. These resources include an installation database that tracks CHP projects in all end-use sectors for all 50 states and the District of Columbia, as well as a database of regulatory requirements for small electric generators. A searchable database of CHP project profiles compiled by the CHP Technical Assistance Partnerships (TAPs) is also available.