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And the sustainable development/energy folks wonder why they can't get us to take them seriously.
Check out this bit of technological illiteracy in an FAQ on energy sources:
Why don't we build a solar plant on the moon and beam the energy back to Earth?
But wait--if they use "transmission lines," then it's not technically impossible, just difficult. Of course, it would only occur to idiots like this to use transmission lines, and of course the question said nothing about transmission lines--it asked about beaming power.
"Beaming" electricity is not quite the same as beaming Scotty up to the Enterprise.
True. Unlike beaming Scotty, it's actually been demonstrated, with 90% efficiency...
Electricity travels along transmission cables that are inefficient and very expensive: high voltage cables can cost thousands of dollars per mile.  If we could devise a way to efficiently "beam" electricity without transmission cables, we would be utilizing this technology first to connect earthbound power plants with various earthbound consumers.
Except for that nasty little line-of-sight problem...
They don't seem to have any concept of using the right tool for the job. Of course, where you can, you use transmission lines, because they're more efficient than beaming. But if you can't, then beaming may be good enough.
Perhaps a better idea would be to build solar plants on the earth and then just keep the energy here.
Except that the sun goes out at night, and it's diminished by clouds, and not all latitudes get decent sunlight, and...
The problem with terrestrial solar is the storage problem. It can't provide reliable 24/7 power, and it will always be a marginal, decentralized source until we can come up with cost-effective ways to store large amounts of energy.
It is true that the sunlight on the moon's surface can be more intense than on the earth's surface, due to its lack of atmosphere, but this greater intensity does not justify the R&D effort that would be required to pursue extra-terrestrial capture of solar energy for use on earth.
No, it doesn't. Of course "intensity" is not the reason that gathering power in space is potentially attractive, as the numbskull who wrote this would have learned from even a cursury glance at the abundant available literature.
The interesting features of space power are that it's available continuously, there's no weather to interfere with it, and you can get much higher effective power densities at the ground collector than with terrestrial solar.
Furthermore since most industrialized countries experience power losses of about 10% between the generating plant and the customer, which is only at most in the hundreds of kilometers, there is no way the energy would be still coursing through the transmission cables after the 384,400 kilometers it would have to travel from the moon to the earth.  
Not just ignorance, but willful ignorance because, as I said, a quick google would have revealed how stupid a statement this is.
But these people live in their own little world, and when they hear about an idea, they don't bother to actually research it, or give it any serious thought or analysis (though it's not obvious in this case that whoever wrote this nonsense is even capable of it, either from an intelligence, or knowledge standpoint), because its politically incorrect. Unlimited power from space implies that we don't have to live in their little "sustainable" renewable gulag, that we don't have to give up our SUVs, that we don't have to start splitting our own wood.
There are serious critiques to be made of space-based power (particularly from the Moon), and I'm on the fence as to whether or not it's a viable future energy source, but this is simply pathetic.Posted by Rand Simberg at September 13, 2003 03:38 PM
"There are serious critiques to be made of space-based power (particularly from the Moon), and I'm on the fence as to whether or not it's a viable future energy source, but this is simply pathetic."
I'm not on the fence regarding it being "viable future energy source", but I don't think the way of getting there as commonly described by NASA paid studies has a chance in hell of working.
Do NOT forward this to Jerry Pournelle.
His head would explode.Posted by Tanstaafl at September 13, 2003 09:45 PM
Good grief, like Simberg said, you'd the idiots who wrote the FAQ would do a little research on the possibilities of transmitting energy to Earth from space. I've long been a proponent of space based solar power since it is the only renewable energy source which has the potential to supply every watt we need. And such a power source sure beats the hell out of cluttering every mountain top and sea shore with windmills or paving over vast areas of land with solar panels.Posted by Yes to Space Solar at September 13, 2003 10:55 PM
Don't forget that we have other uses for that sunshine on Earth. Agriculture and plant life in general needs a lot of sunshine too.Posted by at September 13, 2003 11:30 PM
I'm a little confused by the previous anonymous statement. Does the writer seriously think that Solar Power Satellites could impede enough sunlight to affect agriculture?
About the only quibble I have is that I think the correct Latin plural is IGNORAMI. Not having ever attended Catholic schools, though, I could be wrong.
Tanstaafl, Jerry's head wouldn't explode. He'd just forward gbaikie's post to Larry Niven and next year we'd have 'The Ringworld Billiard Table' on bookstore shelves; a novel about the placing of a giant skrith plate in geosynchronous Earth orbit to make that Canadian energy beam do a proper bank shot on its way to L.A.Posted by duheagle at September 14, 2003 03:41 AM
I'd get less annoyed by this sort of thing if people would realise that generally we don't have an energy problem, at least one that nuclear fission and fast breeders can't solve.
If people would get over their nuclear hang ups we could move to a nuclear/electric system - mybe hydrogen for cars but that's not needed for quite some time.Posted by ave at September 14, 2003 04:38 AM
This post, coming after the "evil jewish death rays' post, show that the two groups in question have a lot in common in their thinking processes. The major one is that they have no undertstanding of how science and engineering works, having replaced them by wishful thinking.
(I took a look a their FAQ on geothermal, a subject I know something about, and it's full of all sorts of wishful thinking. By now they should know that geothermal is a mining operation, and is renewable the same way coal is renewable,although the time frame isn't quite as long. And it's not pollution free, either. They mention air pollution, but not the scaling of pipes from minerals coming out of solution due to lowered fluid temperatures. At some plants pipes have to be reamed out on a frequent basis. And they gloss over the destruction of whole ecosystems based on hot springs, which are destroyed in the process, and never mention the fact that the best places for geothermal power are protected by national parks. How can you talk about Western US geothermal without ever using the word "Yellowstone" in your FAQ? What a bunch of shills.)
G. O'Neil, in The High Frountier, wrote, microwave electricity back to earth. Reading this I Assumed that the technologh already existed to do this. What I understand from the article, is that eather the technology does not exist or it requires too big of a percentage of the eletricity generated in space to make it economical. ---If O'Neil is right and it takes a 7 mile radius of land on earth to prevent injury to people by the dispersal of the microwave beam. then that would cancel out the articles argument of "line of site power transmition on earth as opposed to power cables." ---This brings up another question? Sinberg please note! How much of the book The High Frounter is realistic/feasable?Posted by Jim Coomes at September 14, 2003 03:55 PM
I am surprised that nobody so far has mentioned the 28 day-night cycle of solar flux on Luna's surface being a problem. :) Actually, electricity currently is being stored. In the US, there is about 18,000 MW of pumped storage for the diurnal cycle. Water is pumped uphill at night, and let run down through turbines in the daytime. Short term demand changes are handled by "spinning reserve", which is generators not running at full torque. This is in addition to the plants that are throttled at night to match the demand curve. (The big fossil burning base load generators can't be deeply throttled) Electricity demand is about a factor of two greater during day than night, depending on season. (Summer is more cyclic than winter) Until ground based solar plants reach several thousand MW, there is no storage problem with terrestrial solar power. Ground based solar plants are not being built simply because they are not cost competitive. They're getting close; note the new 50 MW solar plant Solargenix is starting to build near Boulder, NV.Posted by at September 14, 2003 04:01 PM
I have been reading about space for many years. Unfortunatly I have found very few people who share the same interest who I can discuss the subject with. Thus I am full of misconceptions about space. BUT I am very interested in learning. It might help me and other people if you re-posted old articles on pertenant subjects so that we can correct the misconceptions that we have.Posted by Jim Coomes at September 14, 2003 04:09 PM
I did not intend the previous post (the one ending in Boulder, NV) to be anonymous. The software seems to have dropped ny name. From Dan DeLong. BTW, there is lots of good info on this subject at www.eia.doe.gov.Posted by Dan DeLong at September 14, 2003 04:11 PM
I am surprised that nobody so far has mentioned the 28 day-night cycle of solar flux on Luna's surface being a problem.
Actually, many people have--just not in this particular thread. Criswell's response is to have collectors all over the surface, and move the power to the transmitting antennas via powerlines (perhaps of lunar aluminum).Posted by Rand Simberg at September 14, 2003 04:55 PM
Jim, Space Future has a treasure trove of information on this subject, as well as many others.Posted by Rand Simberg at September 14, 2003 05:15 PM
So, that came from an outfit called REPP? They must have mistyped the acronym. They wrote "Renewable Energy Policy Project". What they really meant was "Really Empty-headed Powerless Pinheads".
Of course, I could be mistaken. Perhaps some other readers can take a crack at deciphering what they really meant.Posted by Dave at September 14, 2003 10:55 PM
"The highest record of 84% efficiency was attained
(see http://www.kurasc.kyoto-u.ac.jp/plasma-group/sps/history2-e.html)Posted by Mark Amerman at September 15, 2003 05:47 AM
This is pretty bad, but doesn't even compare to the stupidity I ran into on a discussion board a couple of years ago where a colossal ignoramus calling himself Dsee was trying to promote the idea of capturing energy from lightning as a viable alternative source. The exchange was astounding.Posted by Andrew at September 15, 2003 06:04 AM
Nuclear power has the great advantage over
But skipping that it looks to me like
For another nuclear power carries the
For another nuclear power carries the
I would say extraordinary incompetence AND extraordinarily bad engineering. To have a critical failure like that in a modern western reactor is pretty much impossible - apart from the neutron absorbing shut down systems and the second containment vessel, there's a bunch of other safety systems that make it impossible to even deliberately repeat that. Of course, there is still the "fear factor" of nuclear which is harder to quantify.
I remain agnostic on the true costs of space based power systems as, frankly, we haven't a clue. Nuclear is here and now and something we ought to be taking an example from the French.Posted by Dave at September 15, 2003 06:31 AM
People have already imagined a number of different
Imagine a large dish mirror that bounces the sunlight
We end up with two large static structures, the mirror
Oh, and we need also a microwave-transmitting array
The materials required could be mined from the moon, thrown
Remember I'm ignoring the cost of learning how to do
Remember there are no environmental costs, the space to
Maybe the real cost turns out to be nothing that happens
There are many unknowns here. At best one can only
I'm not arguing that an SPS is complex, far from it. The basic mirror/heater type array is mechanically simple.
Where my problems lie are in the statement "Remember I'm ignoring the cost of learning how to do all these things."
I suggest you start drawing a simple Gant chart of the items you need and when you'd need them. Take the construction of a similar sized structure on Earth but assume that the production infrastructure also has to be assembled first. Also, don't ignore that many of these things have not yet been attempted and while we have theorectical concepts of how to mine and smelt lunar materials we have not done so. Nor have we build linear accelerators or coil guns on the scale needed to get lunar materials to Earth orbit.
Given we have no orbital or lunar infrastructure and that cost should not and cannot be excluded from the equation, I don't see the sums adding up even with a 3 or 4 order of magnitude drop in launch costs.
So considering this statement, "sit down and think about what is required to run an oil-fired power plant or nuclear or solar cells on someone's roof -- the space-based solar powered plant is going in the end to be cheaper.
I'm sorry, I don't really think it is. Certainly not at the moment, and even when we have the infrastructure you discuss I'm not convinced it will be cheaper then.Posted by Dave at September 15, 2003 08:58 AM
This is bad, but bad information on technology is common. How often have you read ?Nuclear waste will remain radioactive for (insert some number between 10,000 and 250,000 here) years??
Virtually everything is radioactive. The potassium that you need to live will still be (naturally) radioactive after the sun dies. The typical story about nuclear waste is worse than useless. Honest comparisons of the safety and practicality of various power sources are rare.
There?s no doubt solar power from space is technically feasible, but I?ve always questioned the economics. I?m pro-space, but it?s hard to understand how a giant space solar array running at 15-40% feeding a giant space microwave transmitter beaming to a giant ground rectenna at 70-85% generating DC to be converted to AC at 90% could compete against Earth based power sources. Don?t forget that the space based hardware has to handle substantial radiation, and is just a bit more expensive/harder to build than Earth based hardware (even WITHOUT Nasa). And there are folks ALREADY worried about the low-density microwave energy, so good luck building the rectennas.
If somebody came up with a self replicating robot system, it might make sense, or when space gets a lot cheaper. But I think we?ll do a lot of other things in space before this becomes a serious possibility.Posted by VR at September 16, 2003 04:06 PM
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