Solar power will soon be as cheap as coal

Inside a sprawling single-story office building in Bedford, Massachusetts, in a secret room known as the Growth Hall, the future of solar power is cooking at more than 2,500 °F. Behind closed doors and downturned blinds, custom-built ovens with ambitious names like “Fearless” and “Intrepid” are helping to perfect a new technique of making silicon wafers, the workhorse of today’s solar panels. If all goes well, the new method might cut cost of solar power by more than 20% in the next few years.

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