The Solar Energy Industries Association (SEIA) has made a particularly concerted push, sponsoring a solar festival at Coors Stadium in Denver during the Democratic National Convention, and constantly reminding lawmakers of the popularity of solar power among the American public.

FORBES: How Washington Cripples The Energy Industry

At least that's the message at solar energy's keystone event at the Democratic National Convention.

FORBES: Solar's Convention In The Sun

Whether you are looking at London leading on congestion charging, or San Francisco leading on solar power (with a system the size of a football field on top of its convention centre), it is clear that strong civic leadership matters most of all.

BBC: Time to leave the comfort zone