Fry bacon in pan and add clarified butter. Stir in onion and cook until soft. Add flour and chili powder and cook another 3 minutes. Add beans and 1 cup water to thicken mixture. Cook over low heat for 1 hour. Gradually add white wine and remaining 1/2 cup water. Finally stir in sour cream and simmer 10 minutes. Season with salt and pepper and serve at once.