Solar is an extremely specialized tech that will not provide even a small fraction of our electricity. Refrigeration is insane. 1kwh would take a man about two to three days of pedalling to produce. There will be practically no electric motors post-petroleum-glut. How many people know the amount of energy they use? Our society is energy-oblivious. The average post-petroleum-glut person will afford no more than 50-100kwh per year. That's the optimistic scenario. Lights and communication. No motorised transport, no motorised washer, no motorised refrigeration, no motorised water utility. 95% (plus) decrease of our society's energy input in two generations. And don't forget that nuclear power = nuclear disaster/war on a long enough timeline. Nuclear power is mankind's surest suicide path.