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Comment by iwwr | Hacker News Reader

That is also the promise of nuclear breeder reactors, an ability to turn natural uranium into nuclear fuel, which will increase the availability of fuel by over 100 times. If you also consider thorium cycles, multiply by 4.

Nuclear is a huge and yet untapped energy source, which is unlikely to be depleted even with constant annual increased demand. Nuclear is more feasible at least up to the point we start to cover non-trivial percentages of the planet in solar panels.

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non-trivial percentages of the planet in solar panels.

0.1% of the earth's surface area to match current total energy requirements. Which sounds tiny. Or the same area as Spain, which sounds huge.

Or space-based solar and lasers! Which can get as large as you like and not destroy ecologies the size of Spain. And works 24 hrs a day, not 12.

Well, you would split it up a bit, rather than bulldozing an ecology the size of Spain. Would probably be quicker to roll out than the space based version and there are grid scale storage technologies available which might be relatively expensive, but are still orders of magnitude cheaper than solving the same problem by going into orbit. In the long run I think orbital solar looks promising, but there is a lot more work left to do there than with implementing it at ground level.

And I believe the opposite. Remember power generation also has to be delivered, so solar farms will want to be near cities. There's not a lot of room, it will take more land that the freeway system! And that took decades to seize the land through eminent domain.

The opposite of which bit?

Orbital solar starts to make sense when you need a collection area that's larger than what's feasible for Earth and currently Earth is not scarce as far as available surface area :)

It is, near cities where the energy has to be generated. And its hard to procure because of eminent domain fights, environmental impact statements and high costs.

Given we are in a world of 500 km underwater interconnects and synchronous grids that span up to eight time zones, I am not sure why you think electricity needs to be generated right next to cities.

Though, that said, existing urban rooftops are over a third of the required area to power the world, so you might as well stick some there while you are at it.

Transmitting electricity is quite a bit different from transmitting bytes. That's the main reason we are using Alternating Current rather than Direct Current to power virtually everything.

I'm not talking about data cable.

Was referring to NorNed, a 500km HVDC 700MW interconnect between the Netherlands and Norway https://en.wikipedia.org/wiki/NorNed,

and the Russian power grid IPS/UPS https://en.wikipedia.org/wiki/IPS/UPS

edit - the limits to how far you can push transmission are very high indeed. For instance, here's a study from 1984 that puts an upper limit on AC at 3000 - 4000km and for DC at 7000km. http://large.stanford.edu/courses/2014/ph240/sell1/docs/pari...

Man, my working knowledge is really outdated.

Sahara desert is big :)

https://en.wikipedia.org/wiki/File:Africa_satellite_orthogra...

Shade from big solar panel installs may even create quasi-mini-oasises for animals/plants.

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