"Southwestern Energy Company" . . . . . . . "Southwestern Energy Company Natural Gas" . "1.1848E10" . . . . . . "1929" . "Southwestern Public Service Company" . . . . . . "1929" . "2.547E9" . . . . . "938" . . "6.667E9" . . . "Southwestern Energy" . . "Southwestern Energy Co." . . . "3397000000" . . "-2.5E7" . . . "Southwestern Electric Power Company" . "Southwestern Energy" . . . .