3 ms·

Can the ovens you mention be powered by electricity from nuclear or hydro?

• ttflee 6y ago
  Or even better, powered by solar, which closes the loop.
  • jp555 6y ago
    The coal ingredient still vents off toxic and radioactive waste in the making of the polysilicon. And with the rapidly falling price of PV, it's unlikely we'll see expensive investments that do not reduce costs.
• jjk166 6y ago
  The coal is there to remove oxygen from the silicon. That it also provides the heat required is just an added bonus. You could add carbon capture equipment and use nuclear or hyrdo electricity to break down the CO2 back into carbon, and this carbon could be reused instead of fresh coal which would also limit the emission of other pollutants. This is a substantial additional cost though, and the conversion of an existing plant to run this way is non-trivial.