Arizona Solar Business Opportunity - website put together by a public relations firm that summarizes the state of solar in Arizona. American Solar Energy Society - nonprofit organization dedicated to increasing the use of solar energy, energy efficiency, and other sustainable technologies in the U.S.

Arizona Consumer's Guide to Buying a Solar Electric System - NREL-produced guide to buying a photovoltaic system.

Arizona Solar Center - state chapter of American Solar Energy Society (ASES).

Arizona Solar Energy Industries Association - trade association who's focus is on education, professionalism and promotion of public policies that support deployment of solar technologies in Arizona.

AzRISE - AzRISE is a global institute created at the University of Arizona with academic and industrial partners to enable multi-disciplinary research, development, and practical implementation of solar energy solutions to meet our energy needs by creating innovative collaborations in research, economic and public policy analysis, and education/outreach.

California Solar Center - history of solar thermal and photovoltaic systems.

Florida Solar Energy Center - organization that tests and certifies solar thermal collectors.

How Stuff Works - article on standard power grids and on solar cells.

NREL Guide to PV Systems - summary about different types of systems.

NREL Consumer's Guide to Solar Water Heating - explains background information on solar water heating along with tips to choosing contractors.

Popular Mechanic - article on solar hot water.

PV Resources - wonderful resource with general information on photovoltaics as well as a listing of large arrays across the world.

Renewable Energy Policy Project - REPP's goal is to accelerate the use of renewable energy by providing credible information, insightful policy analysis, and innovative strategies amid changing energy markets and mounting environmental needs by researching, publishing, and disseminating information, creating policy tools, and hosting highly active, online, renewable energy discussion groups.

Renewable Energy Resource Center - Vermont page with good basic information on solar electric and hot water systems.

Solar Electric Power Association - an industry association that facilitates solutions for the use and integration of solar electric power by utilities, electric service providers, and their customers.

Solar Energy Industries Association - national trade association for the solar industry that works to expand markets, strengthen research and development, remove market barriers, and improve education and outreach for solar.

Solar Energy International - organization offering online courses and hands-on workshops in solar, wind, and water power and environmental building technologies worldwide, as well as in Tucson.

Solar Rating and Certification Corporation - nonprofit organization whose primary purpose is the development and implementation of certification programs and national rating standards for solar energy equipment.

Union of Concerned Scientists - citizens and scientists working for environmental solutions in different areas.

U.S. DOE Guide to Solar Water Heaters

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