IMPROPER PLANNING/DECISION BY THE PILOT, WHICH RESULTED IN FUEL EXHAUSTION AT A LOW ALTITUDE, DUE TO AN INADEQUATE SUPPLY OF FUEL; AND HIS FAILURE TO MAINTAIN AIRSPEED, WHICH RESULTED IN AN INADVERTENT STALL/SPIN. FACTORS RELATED TO THE ACCIDENT WERE: THE LACK OF ALTITUDE, WHICH RESULTED IN THE PILOT'S FAILURE TO RECOVER FROM THE STALL/SPIN IN TIME TO AVOID THE TREE & POWER LINE.