Projects and models

Community Power Network: Resource connecting community energy groups across the U.S. with shared knowledge base, and resources to help groups plan community power projects.

Northwest Community Energy: Resources on community energy including cases studies of a few projects in solar, wind, geothermal, and bioenergy. 

Solar Gardens Institute: Community solar projects by state

Community Solar Power: Report by the Institute for Local Self-Reliance.

Hull Wind - "...advancing the use of wind power in a coastal community"

Policy

Vote Solar: State and federal policy. See also their Community Solar Toolkit.

Solar Gardens Institute: Legislation by state. See this map for a view of which states have policies that support community solar.

Feed-in tariffs: 

• http://www.greentechmedia.com/articles/read/can-the-u.s.-or-california-institute-a-feed-in-tariff/: Some info on which cities in the US have implemented feed-in tariffs. 
• Palo Alto CLEAN program; see also this article on the program.