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DC is apparently more efficient at higher voltages. I used to work for a utility (developing powerflow & stability software), and there are a number of very high voltage (1 MV, IIRC) long-distance interties out there.
As to the program, I don't think that totally renewable is doable in any realistic time frame. But build nuclear to replace a lot of the current coal-fired generation and provide a system base generation, and you can build to 30-40% or so solar & wind. Beyond that, you need an efficient storage mechanism, and all the ones I've seen lose a significant fraction of what they store.
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