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I like the ARES gravity rail electric storage solution. Diesel electric trains are well known for decades. The only difference is discarding the engine and electrifying the rails. Which we need to do anyway for transportation. Adoption and build out (rebuild of what we already had and got rid of when diesel trucks came along) of a complete electric rail system should be very high on the list.
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The transport trains could actually follow the loads and just park for the troughs.
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Along with build out of a smart grid with HVDC interconnects everywhere and hundreds of million V2G electric vehicle charge stations in every parking lot. And real time price metering so that every giant battery in an EV can most often be used for grid storage when not on a trip.
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