The state has begun reviewing an application to develop a wind farm in northern Hancock County and is weighing whether to schedule a public hearing on the proposal, which three years ago generated concerns about its potential to kill birds and bats. The Maine Department of Environmental Protection determined in mid-November that the application from Longroad Energy to develop a 22-turbine wind farm in Eastbrook and Osborn is complete, Mark Bergeron, director of the DEP’s bureau of land resources, said Monday.