THE PILOT STATED THAT HE WAS RETURNING FROM AERIAL APPLICATION OPERATIONS WHEN HE ELECTED TO LOOK OVER THE NEXT FIELD HE WAS GOING TO SPRAY. HE SAID HIS INTENT WAS TO FLY AROUND A HOUSE ON THE WEST SIDE OF THE FIELD AND THEN DROP DOWN TO FLY PARALLEL TO THE POWER LINES ORIENTED EAST-WEST BETWEEN TWO FIELDS. AS HE BANKED AROUND THE HOUSE AND FLEW EAST INTO THE SUN, HE DID NOT SEE THE HOUSE'S POWER POLE AND ASSOCIATED SERVICE LINE. THE ROTORCRAFT IMPACTED THE SERVICE LINE APPROXIMATELY 20 FEET AGL AND IMPACTED THE GROUND 150 FEET FURTHER EAST.