Solar Power International, previously called Solar Power Conference and Expo, was created in 2004 when the Solar Electric Power Association (SEPA) and the Solar Energy Industries Association (SEIA) joined together in partnership to fill an obvious void: the US was missing a business-to-business solar conference and expo. With an industry growth rate of more than 40% per year, there was a need for a single event where industry could come together with potential customers, policymakers, investors, and other parties necessary for continued rapid growth. It didn’t take long for the event to establish itself as the premiere solar event in the US, growing from 1,100 attendees to over 12,500 in just 4 years!