Actually, decentralised power sources would make high voltage lines obsolet because you can build them where you need the electricity. Centralised systems need

Actually, decentralised power sources would make high voltage lines obsolet because you can build them where you need the electricity. Centralised systems need high voltage lines around the country. Energy density is not a good measurement I think. In theory the sun sends more energy per day than we might ever need but we can only make use of parts of that. This is improving but still, just a tiny part of it. The same with Thorium or Uranium or even fossil fuels. Usually the efficiency of those power plants is well below 50%, nuclear power below 40%, coal even less, especially those "clean coal" CSS plants. The problem with molten salt reactor will be the same with fast breeders, where the liquid sodium was/is causing corrosion and problem when mixing with water. IIRC most accidents in FBRs were sodium related. And even if MSRs are cheaper in one way than current designs, it doesn't say they are not more expensive in other ways. But currently none of those reactor designs is ready for commercial use. None! With the time you need to get such a design up and running, you can also deploy renewable energy. Much more reliable and stable. In 2012 about 7.5 GW of renewable energy were deployed in Germany. Even if you calculate that not all of that is available around the clock, you would have build more than 2 EPRs with 1.6 GW electrical power to get the same amount of energy, which you just can't do within one year. Maybe MSR solve a lot of problems with nuclear energy but it won't come free, it won't come w/o other problems. All forms of energy have drawbacks. Photovoltaik uses rare earth, wind has huge towers which are not really popular with locals, water has a huge impact on rivers and the environment. Biomass has the problem with using food for energy, and usage of land. I could continue the entire night. The important question is a different one, do you want to solve the energy problem or just ask the next generation to solve it for you?