I have gotten away from oven use and oil use just by settling for foods being boiled (oatmeal, barley, millet, and other grains) like a porridge, and vegetables being what I think is called "braised", which in practice for me means I boil a small amount of water in a pot (half a centimeter?), then add my veggies when it is boiling, and keep it boiling or simmering until they are as cooked as I want them to be. To further save on energy, I sometimes put another heavy pot on top of the cooking pot lid, to make a sort of make-shift semi-pressure cooker simulation. then turn the heat down low. Only if I can stay close by to watch it. But I don't mind eating mushy things. If I cook for someone else who wants pancakes or something, I have a well-seasoned cast-iron skillet that I only need a little oil in.