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RE: Tech Report: Solar Power as a Viable Alternative to Fossil Fuels!
The mass deployment of solar energy will be largely dependent on how cheaply it can be stored (this is why fossil fuels are hard to transition away from; they represent highly concentrated sources of stored solar energy in chemical form).
Electricity is expensive to store, but I hear that solar thermochemical fuels can also be manufactured, thereby created a liquid fuel source...
To add on to this, Stanford did do a study on sodium based batteries, which can be manufactured much more cheaply than Li-Ion batteries.