Go for a damned good ride round on your bike. While you are riding, charge a medium sized 12V dc battery. When you get home, connect the battery to the lamps circuit and it will light the house.
After your ride, you will want to take a cold shower to cool off, so that's not wasting energy heating water.
Walk around with minimal clothing until you feel cold and then put on some thick woolly clothes to keep warm.
Walk or cycle to the shop and buy some 'reduced for quick sale' cold pasties. Drink room temperature cheapo diet coke. No energy wasted cooking or fridging.
Convert your bed into a heat exchanger so you have a little bit of warmed water to wash with in the morning. Or better still, cycle to work and shower there.
You see, you don't need mains electricity.
Can you see I've spent some time living in a tent?