[anamax]

> That says global 'consumption' is about 80000 TWh a year. Incoming solar energy is about 1700 times that

Assuming that you still want oceans to work, about 2/3rds of that is not available, which get us to 500x. You also want land-based plants to work, which gets us to <250x and much of the remainder is unsuitable, so let's call it <100x.

"make equipment" through end-use solar is <20%, so we're down to <20x.

What else am I missing?