We have a time-shifting problem where the energy we want is not available when we need it. And that is cheapest and most effective to solve with storing what you have rather than just constantly building.
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Company/startup news
Fourth Power—an MIT startup with MITEI roots—has designed a solar cell that generates its energy through built-in solar panels powered by hot graphite. Founder Asegun Henry (Mechanical Engineering) states that this "could become a preferred method of providing extra power to electrical grids during periods of peak demand."