dobrojim wrote:dckingsfan wrote:dobrojim wrote:https://www.forbes.com/sites/amorylovins/2014/09/07/fusion-power-the-case-of-the-wrong-competitors/?sh=4bfa55b16c3b
old piece from 2014 but as usual, Lovins nails it. I suspect the economics have only gotten
better for renewables and therefore, worse for everything else since 2014.
Yes, they have. But we are still going to have that messy transition as we still need power to create those solar panels.
And we still need those rare earth minerals for batteries. We have 14% of the worlds reserves but won't mine them. Combine that set of NIMBY issues with you now have the fossil fuel guys battling off-shore wind and solar farms.
It is going to be a fascinating transition.
https://www.solarmelon.com/faqs/solar-panels-use-energy-manufacture-actually-produce/What they found was good news for solar energy advocates: solar panels generate more energy than they use, overall, and have been doing so since at least 2010.
https://pubs.acs.org/doi/abs/10.1021/es3038824
This was 9 years ago and has almost certainly improved since then.
Of course there is no free lunch. No one can rescind the laws of physics.
I'm not sure what the quibble is. Renewables are passive and the passivity means there's less control over output, which is why energy production requires a portfolio. Nuclear is preferred to fossil because of carbon emissions.
There are also different metrics of efficiency. When coal plants say they're 45% efficient, it means 45% of the energy produced is converted to usable electricity. While solar can claim that the panels generate more energy than they use, the efficiency of solar energy received vs. electricity generated is about 20-25%. Not a big deal, because there are no emissions. Apples to oranges.
The fusion breakthrough, and claims that it can generate more energy than it uses, doesn't really mean anything because at the end of the day, the reactor itself isn't much more different than a fission, or even coal plant, and the reactor efficiency is roughly the same: 45% conversion of heat to electricity. And it doesn't matter for fusion because it's 0 emission. Coal plants care about conversion efficiency because the more efficient, the less coal/kw they'll need, and less emissions.
And ultimately, yes, the real calculus boils down to $/kw, except fossil plants don't include the uncalculable cost of global warming into their $/kw figure, and renewables don't bake in the uncalculable cost of having inconsistent energy availability into theirs.














