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I appreciate your enthusiasm, but this is like comparing apples to pitbulls. Both of these goals are big milestones, but fundamentally different. With space, everything that was created and invested was brand new. There was not too much worrying about existing infrasture. Often, there would be thousands of people working to make 1 individual mission happen. Energy in the US is a lot different. For instance, you have to keep the massive machine that is the electricity transmission and distribution grids running. Here's a scope of the challenges of 100% renewables, for anyone without a background in this (one should view challenges as opportunities): First, there's a lot of existing generation that would need to be sunsetted and even more that would need to be created. In fact, given the intermittency of renewables, there would need to be a multiple more of capacity than there is now given the capacity factor, usually divide 1/CapacityFactor (see more on that here: https://www.nrel.gov/docs/fy13osti/57582.pdf). So, 4 GW of installed wind capacity is really only expected to output ~1 GW at any point in time, given the intermittencies. Second, there will have to be a lot of upgrades made to the transmission grid (sending power long distances from large scale renewable generators to population centers), and the distribution grid (sends power to all the buildings and homes in a city). The distribution grid upgrades to be made will have to help it handle a lot more rooftop solar, home batteries, and electric vehicles. Third, there will have to be a lot more storage installed. Electric vehicles can have a large impact here, but there will still be a need for in-home and grid-scale batteries. Batteries are also just getting to the point where they're economically-feasible in some uses. There is still a ways to go for batteries to be economical enough to be widespread, especially grid-scale. Physical storage of electricity will likely have to grow too (think: pump to a higher lake when prices are low, and let it flow back down and turn a turbine when it's needed). Fourth, and this is definitely my opinion (and what I'm working on), is that we are going to have to make everything work together more. We can't have all these batteries, solar panels, and other connected appliances and thermostats do whatever they want at the distribution level. We will have to change to time-varying rate structures for end-consumers, but this won't be enough either. Communication and coordination will yield the best results. I tried to be brief. If anyone has any more questions or thoughts about this, I would love to hear them! |