By definition, an alternative energy vehicle is one that utilizes a primary power source other than gasoline or diesel fuel. This event has had participants with vehicles power by sources such as electric, solar, hydrogen, methanol. All vehicles must pass the SunDay Challenge safety and class qualification inspection held prior to the event in accordance with event Regulations and Rule Book. Some vehicle classes follow similar event rules. Drivers must have valid driver's licenses and follow local highway laws.
Drivers receive a route map and driver's event manual at the time of registration.
Each year the event had a gracious host, which added to the excitement of the event. The Florida Energy Office of the Florida Department of Community Affairs has been the major sponsor of the event. Now, the event is a partnership with FSEC and the Space Coast Clean Cities Coalition.