Solar power...how much and how much?

Since I didn’t think we should continue to hijack the Nuclear thread I figured I’d move the question here instead and get people’s thoughts on solar and it’s potential, costs, drawbacks and benefits.

In the other thread mention was made of the claim that all of American’s energy needs could be met by 100 sq miles of solar panels in Nevada. From here:

Though I see no citations to back that up, let’s assume that is true for a moment (feel free to provide data either for or against the assertion if you like). What would this cost and how long would it take to build? I found this on Scientific America:

This sounds great. However:

So, for debate…where are we with solar and how would we get to a large percentage of our energy needs being met by solar? How quickly (realistically) could we get there and how much (realistically) would it cost? Based on current technology and where the technology is going in, say, the next 10 years, how would it most likely be deployed and how much area might it take up? What are the potential environmental impacts? What are the potential maintenance impacts?

I’ll be mostly away for the next several days until I fly home Friday, but will try and keep up at least at night from my hotel room. I’m really interested in seeing what folks here on the 'dope think of the potential and realities of solar today.

-XT

There is, of course, the annoying fact that some parts of the country aren’t sunny all the time, as the desert southwest (almost) is. Nevertheless, solar could provide a substantial part of our nation’s energy needs right now, if only we had the political will to make it happen. We’re making substantial advances in solar technology all the time, and there’s every reason to believe that with the right incentive, companies could accelerate the paces of their research quite a bit.

Here’s what I would recommend. The federal government should make an announce that as soon as someone makes a 25% efficient solar panel beneath a certain cost, they will purchase 10 billion dollars worth of those panels. Basically like the X-prize, only multiplied by a factor of 1,000. That would get some serious interest from the major energy companies.

I think orbital solar power has way better potential, here, and I believe Obama’s mentioned something about funding it.

We are in a very peculiar position: we have trouble accessing energy, and we are awash in it, its like a fish who is thirsty.

I don’t think solar power is quite ready for prime time yet, but its well on its way. Clearly, it can be a major factor in those areas where sunlight is so consistent and abundant, not so much in Portland.

But I look to research in solar power more for its synergistic effect that for direct, practical application. The guys who invented the transistor did not realize they were inventing the personal computer, the guys who invented radar did not realize they were inventing microwavable popcorn.

Most of our really big strides come less for “Eureka!” moments than from some tinkerer putting together two disparate discoveries to create a third. If we research solar power, we research transmission efficiency (from Phoenix to Portland, say). Research in the photo-electric effect is research into the very fundamentals of what energy is.

The only real reason we haven’t had this breakthrough already is that energy has been relatively cheap, albeit self-destructive, for so very long. We are just really starting something that, had it been started 40 years ago when we dirty fucking hippies started bitching about it, might be already realized.

We will almost certainly abandon our first efforts to practicalize solar energy, because we will discover something better in the process. That may seem like a waste of effort and money, but only if you forget that the effort and money is necessary for us to get the point where we can make such instructive mistakes.

Cheap clean energy is just beyond our reach, tantalizing us. And if we can reach it, and I believe that we can, and we will…we will begin a golden age unlike any currently dreamed of. Even the poorest subsistence farmer will be blessed with mechanical energy far beyond any that he can bring to bear from his own muscles or from beasts of burden.

On Spaceship Earth, energy is the only currency of any real value. Cheap clean energy can make the chasm between the haves and have-nots trivial and inconsequential.

We’re the Americans. If not us, who? If not now, when?

What will be the transmission medium?

I believe microwaves. Why?

The white paper linked here seems to cover quite a bit.

Assume you need a 10,000 square miles of the stuff orbiting the earth. Or some other reasonable number.

Assume a weight for it.

Find out what it cost to put a pound of something in orbit.

Don’t faint when you see all those zero’s on the price tag.

Unfortunately, the costs are not magically vanished here on Earth, either. Those costs for mere earthly structuring, IMHO, are exceedingly optimistic. I’m not saying no one will use solar poewr. But solar is a support-item. It’s not the main show and probably can’t be. 25% power efficiency may not even be possible, at least one earth.

This is not impossible, but it is impractical, which is almost worse. Impossible ight be fixed, but impractical… yeesh.

What you’re asking is not really humanly doable. You just can’t run transmission lines that long effectively. Or rather you can, but the requirements are obscene. You can even build it right now, but actually keeping the thing running would keep all the eingeers in America in coffee and nightmares for the rest of their lives.

That’s a great point. Think back on home computers (hell, they weren’t even called “personal computers” back then!). My parents dropped around $3000 for an Apple IIe in the 1980s. We didn’t do much beyond playing games with it for the first few years. Eventually, when I got to high school, I used it to type papers. Getting closer to useful. Worth $3000? Probably not.

Then you had Apple’s LISA, which was the first Mac-like GUI computer. $10,000. Did anyone do anything really important with it? No. But it paved the way for everything that followed.

Now I can buy a comparatively superhumanly powerful Mac for $1000, or a PC for $200 or $300. And I can run my entire business on them. (My current Mac laptop, which runs my entire livelihood, cost around $1300 a couple of years ago.)

The first cars were not the solution to massive transportation needs or transcontinental freight shipping. But they made later advances possible.

So many things need to be in place before these questions can be accurately answered. But before we get one enormous singular machine to power the nation, there are many smaller things that need to be in place. One not-so-small thing is there needs to be a paradigm change in order to get the money necessary to fund the infrastructure for a project that would fuel the nation. I think in the short term, state governments are going to run their own programs, continue to fund the ones in their states. This is already happening across the country. To give you an idea of how much the current administration wants to put towards alternative fuels, the state of Rhode Island got almost 50 Millionfor energy efficiency needs. This is huge for this small a state and it will go to fund infrastructure for alternative fuels. Solar power has come leaps and bounds in terms of technology, what we have to do is institute price reduction programs in more communities and really build it from the bottom up. Luckily for us this movement has been going on for quite a while and much of the infrastructure is already in place. Companies are growing and merging to form larger conglomerates, these are bringing the prices down somewhat…

Companies like Solar Wrightsin New England merged with a larger competitor and became Alteris. I think this is a move in the right direction, as more and more communities and states do this the more people will see it as mainstream. I think that may answer part of the OPs question.

My first reaction is that covering 100 square miles of desert with solar panels is going to cost way, way more than 400 billion.

Also, how do you get all that energy from the Southwest to the places where people actually use the most energy, two thousand miles away?

A long time ago it cost more than $10,000 per pound to put things into orbit.

Think about it this way.

You want the equivalent of 400! give or take power plants in orbit.

Lets assume the power producing part wieghs or costs nothing.

You are still proposing that you either use lasers or microwave generators/transmitters that can “process” a power level equivalent to a power station.

How much would just that weigh? Its have to be the size of house! And something like thats never been built. Much less a bunch of em.

And you are talking about putting hundreds, even thousands into orbit!

Now you can just reflect the light down to an earth bound solar collector, but even those numbers are gonna be scary.

Take this FWIW:

And of course this does not take into account the incentives that may come as carbon is actually priced and paid for.

In certain locations grid parity or better has already been achieved without even pricing the carbon. Hawaii for example - sunny and expensive to bring in coal or natural gas. (Although I wonder about using geothermal there!) And First Solar in sunny Nevada is reportedly producing power for less than traditional sources can.

Solar will be a better choice for some parts of the country/world than others, just like wind is a better resource some places than others. But in those areas it can be rolled out very quickly as these smaller companies can ramp up production quickly. The limiting factor will be the supply of silicon feedstock (for photvoltaic systems) more than any thing else.

A way around that feedstock limitation is being played with in Israel.

I think the wonder of the thing has us stymied, mentally stalled. Its too good, therefore it cannot happen. Of course its impractical, we haven’t done it yet!

Fund lots of research, most of it small, some of it crackpot. Don’t try to put together the puzzle, concentrate on finding out the size and shapes of the pieces, get enough of that knowledge and a tinkering, semi-intuitive mind is likely to throw a few of those pieces together, and run naked through the streets screaming in Greek.

But I’d want to hedge my bets. I’d want to research alcohol more extensively than I have, jigger around with the innards of yeast and animals that can digest cellulose, for instance. Work on producing a small but strong, durable, and easily repaired engine than runs on alcohol, one cheap enough to be distributed to subsistence farmers world wide. Give Famine a bloody nose.

Stuff like that. And, God? That’s why I should win the lottery.

Your site doesn’t say 100 square miles, but rather “a 100-mile-square area”, or 10,000 square miles.

'luci,

You mean an engine like this?

And yeast jiggering like this?

Others dream similar dreams …

:slight_smile:

My understanding is that photovoltaics are just not practical currently or in the foreseeable future. They are expensive to manufacture, manufacture results in toxic pollution, cells are delicate, etc. However, Using aimed flat mirrors in an array to reflect sunlight in order to heat salt until it is molten and then using that heat to generate power does have potential. The individual components are not prohibitively expensive to manufacture, they do not require rare elements, an excess of water is not used in the process, and once a facility is set up it keeps going for a long time with out much additional expense.

lee my cites contradict your too expensive claim, the pollution is an issue but no different of one than for electronics, and the newer cells are not so delicate. But the molten salt plan is a valuable means of thermal solar that also can shift the power to night-time as needed. It’s getting closer to parity too.

Yes, I realized that earlier but it was too late to correct.

-XT