2024 Washington, D.C.
2023 Boulder, CO
2022 Albuquerque, NM
2021 Boulder, CO
2020 Virtual (was planned for Washington D.C. until COVID)
2019 Minneapolis, MN
2018 Boulder, CO
2017 Denver, CO
2016 San Francisco, CA, at Intersolar
2015 Penn State, State College, PA
2014 San Francisco, CA, at Intersolar
2013 Baltimore, MD
2012 Denver (World Renewable Energy Forum)
2011 Raleigh, NC
2010 Phoenix, AZ
2009 Buffalo, NY
2008 San Diego, CA
2007 Cleveland, OH
2006 Denver, CO
2005 Orlando, FL – Joint with ISES
2004 Portland, OR
2003 Austin, TX
2002 Reno, NV
2001 Washington, DC
2000 Madison, WI
1999 Portland, ME
1998 Albuquerque, NM
1997 Washington, DC
1996 Asheville, NC
1995 Minneapolis, MN
1994 San Jose, CA
1993 Washington, DC
1992 Cocoa Beach, FL
1991 Denver, CO – Joint with ISES
1990 Austin, TX
1989 Denver, CO
1988 Cambridge, MA
1987 Portland, OR
1986 Boulder, CO
1985 Raleigh, NC
1984 Columbus, OH
1983 Santa Fe, NM
1982 Knoxville, TN
1981 Philadelphia, PA – Annual Portland, OR – Passive
1980 Phoenix, AZ – Annual Amherst, MA – Passive
1979 Atlanta, GA – Annual San Jose, CA, January – Passive Kansas City, MO, October -Passive
1978 Denver, CO – Annual
1978 Philadelphia, PA
1977 Orlando, FL
1976 Albuquerque, NM