alt Hacker News> You either need batteries that store energy for weeks of consumption, or backup with fossil fuels, and in any case, that makes solar panels more expensive than fossil fuels.
I love the wild mental gymnastics and cherry picking data these people put themselves through in order to delude themselves in to believing solar is cheaper than gas.
How can it be, when you need to build both. Or freeze in the dark.
As you said, in practice you either need batteries that don’t exist and would be prohibitively expensive because they would sit idle most the year where only hours to days of backup are required, but in winter you need weeks of storage and the output from the panels are significantly reduced so you need to massively overbuild…
OR you need to build gas peaker plants, which also sit idle most the year, but need to be run frequently and maintained to ensure they’re ready to run when needed.
The real world data is available for anyone who wants to run the numbers.
I was in Adelaide and participated in the discussions where Dr Barry Brook[1] and others ran the numbers over ten years ago. Exhaustively ran the numbers, both with real world data from recently built solar and wind, and optimistic projections of future improvements
The fundamentals haven’t changed. Even if the panels themselves were free, the amount or steel and concrete required to replace total global energy requirements with solar and wind is… it’s incomprehensible.
If I recall correctly, it worked out to requiring something absurd like more copper, steel, and concrete, than humans have produced to date (2013 figures) since the start of the Industrial Revolution, every year for the next fifty years just to replace existing energy production and distribution infrastructure, and in so doing we would double or triple atmospheric carbon dioxide levels. We’d then have to work out how to pull those emissions back out of the atmosphere, which wound require further resource use to produce the infrastructure to generate the energy required to extract and sequester the carbon dioxide.
Compare to what we’re doing now which has barely scratched the surface in replacing global energy requirements, with no reduction in carbon dioxide levels.
It all makes a pretty strong case for existing nuclear technology (Gen IV / Gen IV+) to give us time (hundreds of years with existing know uranium reserves) to perfect fast breeder technology so we can use Thorium as nuclear fuel for thousands of years.