Danger from plant explosions from terrorists or when at war. Solar - Costs of materials make this more expensive than natural gas. Most efficient in desert areas. Doesn't work at night. If hydrogen is stored, it is explosive.
Material costs are great as are maintenance costs.
Only works in the day time. Atomic Fusion - This would be great, but we don't know how to contain the reaction. There is still a terrorist or war problem even if the waste problem is much reduced. Note the Selected Key Terms at the end of the chapter p 14.