The Oil Drum

France, which gets nearly 80% of its power from nuclear plants and has never had a major accident — have made nuclear energy work, but at a high cost. The state-owned French power monopoly is severely indebted, and although France recycles its waste, it is no closer than the U.S. to approving a permanent repository. Nuclear power may consume more energy than it produces. "Even utilizing the richest ores available, a nuclear power plant must operate at ten full-load operating years before it has paid off its energy debts. And ... there is only a finite supply of supply of uranium ore containing reasonable concentrations of uranium 235. When this concentration falls below 0.01%, the costs of energy production from nuclear power can no longer cover the costs of extraction of uranium from the earth, at which time the nuclear fuel cycle will produce no net energy; below a certain uranium content, nuclear power produces less energy than is needed to build, fuel, and operate the reactor and to repair the environmental damage." (Helen Caldicott , p. 16). in the United States, the Price-Anderson Act limits the nuclear industry's liability in the event of a catastrophic accident to $9.1 billion, which is less than 2% of the $600 billion guaranteed by the Congress. In any case, $600 billion is considered to be a gross underestimate ..." (Helen Caldicott , p. 32) What does nuclear power have to do with road construction ? A doubulling of the cost for every year after the project was supposed to have been compleated.
The cost of decommissioning nuclear plants. An estimate in 2006 by the UK Treasury for the cost of decommissioning the UK's old nuclear power stations was £90 billion;
Boeing was working on salt and solar heat storage and spun it off to Pratt and Whitney who dropped it. some solar heat storage in salt exist. Some utility scale batterys exist you would just have to build a whole lot of them and have a whole lot of space to put them in. carbon nanotube long distance power lines could help too. I would say superconductor but the planet may not have enougth of the elements needed.
I think the answer is comercilized standardized parts from hundreds of companies in dozens of countries, for what I am not sure but I think it should be solar, wind has been doing rather well I think solar needs more promotion.