I just dont like to limit our future state to our current understanding / tech. Like i said in an earlier post we just proved existence of gravitational waves only 2 years ago, before that they were completely theoretical and many people in here would call it fantasy because it was just based on a 100 year old einstein theory but they are in fact real and constantly passing through us and the earth, unmitigated by matter. Maybe we will be able to generate energy from those waves in the future, we have no idea yet but its definitely something worth looking into.
We need to accept that humans still have a very limited understanding of the universe and there is potential to make advances we dont undersfand yet.
Another example is the EM drive. With our current understanding of physical laws its supposed to be impossible however the tech seems promising none the less
We also dont understand dark energy or dark matter yet, but astrophysicists are convinced its out there due to how the galaxies are formed and rotate
We are still just basic creatures trying to figure out everything, to say we are reaching any kind of limit is silly. If you look back, humanity often thinks they are reach technology limits, yet today we are still making the greatest advancements to date.
We might not even be using the proper materials for our solar panels yet. Maybe attaching an amplifying lens to the panel increases the energy production 10 fold. We dont know until we research more, something dirty energy producers will spend big money to inhibit.
You sound like you "know just enough to be dangerous, but not enough to be useful." Just an old phrase I remember from school, got thrown at us a lot during our first couple of years in engineering. As for dark matter I believe that issue has been settled.
https://www.newscientist.com/articl...s-missing-matter-has-just-been-finally-found/
It's good that you've got an open mind and you're enthusiastic about this stuff, though I don't agree in the particular instance of solar power simply because of Thermodynamics. Something I remember when doing my intro to Quantum Mechanics (intro only, just the hydrogen atom stuff) was that every single time Thermodynamics predicted something it was proven by Quantum. No way around it... you can't get something for nothing. Phase changes require energy... try getting steam from ice without adding energy and see what happens. We'll see what happens in the future but in the mean time we can't use these "possibly new technologies" to solve our current power issues, so we should be looking at feasible methods to solve our current problems.
Edit : since you were talking about harvesting / using our star's energy you reminded of a book I read by Dr. Kaku and the types of possible civilizations in the universe. There's something called the Kardashev scale and it's a way of measuring how advance a civilization would need to be in order to do certain things.
-Type 1 civilization could harness and utilize all energy which is on or reaches their home planet... so we're talking about geo-thermal energy, tidal energy, tectonic movement energy, and a portion of the energy coming from their star.
-Type 2 civilization would be able to harness ALL of the power from the sun... kind of like a Dyson Sphere concept. A theoretical time jump from Type 1 to Type 2 is on the magnitude of thousands of years.
-Type 3 civilization can harness the energy from their galaxy... ie black holes, all planets, all stars, etc. Jump from Type 2 to Type 3 is on the order of hundreds of thousands of years.
Currently it's estimated that humanity is at a .7 and likely hundreds of years from making the jump to a Type 1 civilization.
https://en.wikipedia.org/wiki/Kardashev_scale
http://bigthink.com/paul-ratner/this-mind-bending-scale-predicts-the-power-of-advanced-civilizations
Some pretty cool stuff to think about but even with amazing estimates we're still hundreds of years away from becoming technologically advanced enough to utilize most of the energy coming from our star. While something we should certainly strive to for the future it's not feasible as a current solution to our problems.