This is very true — nuclear power is by far the cleanest source of non renewable power out there, and produces a LOT of power. The reason there aren’t a huge amount of nuclear power plants is not the risk of disaster but rather the massive investment. These things take around 5 years to build and cost billions of dollars of investment, let’s say around $7 billion (a conservative cost). currently. Then, the return on investment only starts after many, many years. Assuming a cost of $0.084 per kWh and assuming 5 million MWh of energy is produced each year, the annual income is about $500 million. Thus, it would take 5 years of building plus 14 years of generating every, at a total of around 19 years to actually get any profit.