Duval−Raven Line Project, US March 31, 2016 | North America Project Update The project entails the construction of a 38.5-mile (61.98-km), 230 kV line from FPL's existing Duval substation in Duval County to its planned Raven substation in Columbia County in Florida. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password