If we start pulling all the heat out of the earth, won't it cool the core too much and accelerate it's eventual demise - ie. being a cold, dead rock?

Like I've always said regarding wind farms - if we put too many of them up, the increased drag on the earth's rotation will slow it down so we all become shorter, and eventually implode on ourselves.

Given that the Icelandic currency has very recently tanked dramatically (think -40% in a quarter), giving then all the advantages of skilled recently-unemployed etc, plus their closeness to all manner of volcanism (remember Surtsey growing out of nothing), isn't that the obvious place? Like send the money now, before their bank recovers, and let them dig there (not too deep)?

(*not the supermarket, the country --- do they have a food store called "england"?)

Don't send cold water down here!

I dont want hell to freeze over.

"if geothermal worked it would be almost without downsides"

Apart from the fact that it might crack the entire planet in half, and/or create a new Volcano in an undesirable location and/or prematurely cool the earth's core, stopping its rotation; leading to catastrophic effects...

... then Google could be in very hot water indeed !

If you pump water out of the drill bit in the hope of causing mini-earthquakes, do you have to use smart water to tell it to come home once it warmed up ? Hopefully it will be kept away from the cold water coming down and it'll be shifted earth bound in a speedy fashion else it will have cooled down again at the surface pump.

This might be one of those "lets build the plant 10km underground, where the heat is" type of Hollywood plots. I'm sure the underground alien/molemen-hybrids won't mind us invading their patch.

"I dont want hell to freeze over."

Thank you for the first genuine guffaw I've had this week! I've also made many a promise, on the premise it'll never happen... :)

Spot on - about 10 years ago, someone did a geothermal proof of concept down in Cornwall. In the first year, they almost got enough electricity out to power the site (enough portakabin space for 4-5 people, a kettle, handful of computers etc). By the end of the second year, they had enough to power all the farms around them, plus 80% of the local villages demand. Maintenance and running costs and so-on were virtually zero.

But then you find out that they took advantage of a natural fissure in the rock and didn't have to do a lot of drilling to get there, and the project lead admitted that there were probably only 4 sites in the uk that "easy to set up", and none of them were much larger. So, it's the drilling...

For all those of you worried about the potential side effects (cooling the planetary core, causing earthquakes, or cooling hell), then it's worth pointing out that geothermal systems are essentially static in terms of volume and pressure and the heat recovered is insignificant compared with what is actually down there.

Humans have done a lot more geological damage by oil, mineral, gas and water extraction. There are some hints that our over-use of water aquifers may have slightly affected the odds of earthquakes occurring in some areas, but our dumping of CO2 and Nitrogen into the biosphere, deforestation and building programs are having a much more significant effect then powering the entire planet on geothermal ever would. Just don't build them really close to major fault lines, and they'll be fine.

The early 80's in fact; and there was a pilot plant working in Kent; I dont remember the details, but I do remember it being was being used as an example of a successful alternative energy generator.

It was run by a University and had government money backing it, the bloke talking about it at the seminar I was attending was some eco-suit from Whitehall.

You need to drill two holes, input and output; pump cold water down one and hook the other up to a steam turbine.

Google, if you are reading this, you can use my back garden as long as I get the free leccy!!!!

"National Geographic featured a documentary on Geothermal Energy. And it mentioned a technology thats still under development, called a Flame Jet Drill ."

Yup indeed, plasma drilling is something that's being experimented with just now and has the potential ability to revolutionise drilling. Only problem is it's years away from being a viable technology.

The basic technology for geothermal tech (drilling and completing wells, fraccing, recovering hot fluids to surface) has been tried and tested in the oil industry for many years now, even in hot, deep reservoirs. I suspect the main issue will be with actually circulating and heating the water at a high enough rate up and down the hole to make it economically viable for the astronomical expenditure required up front for all this hi-tech kit (at least from a drilling perspective).

Simple little physics equation.

As long as you have gravity, you will have "hot" rocks at a certain depth.

You are not drilling down to the mantel.

And if you didn't take high school physics, keeping volume constant, the greater the pressure, the greater the temperature. So the deeper you go, the greater the pressure on the rocks, so the greater the temperature.

This was discussed in New Scientist a year or so back. The big and so far unsolved problem is that as the high temperature water comes back up the pipe it deposits minerals, rapidly furring the pipe up.

The other problems are:

1. Digging a 10km hole is not easy and uses shedloads of energy itself,

2. The immediate site cools down over around 20 years and then has to be left dormant for about 100 for magma currents to re-heat it, meaning you need five stations to provide one station's worth of power over a century.

Whislt welcome, it would be much better if we simply stopped wasting so much energy in the first place...

Is Google drilling in Mountain View? They can probably suck up enough leaked gasoline, chip fab solvents, and garbage methane to power generators. Silicon Valley has vent pipes sticking out of the ground to prevent explosions and ground water contamination. The business park I'm in now has arrays of ground vents, methane alarms, and a strict "no outside fires" rule.

This is all a front to plant a nuclear warhead near the earth's core and hold the world ransom for "1 MILLION dollars!"

-ph cos she's as hot as "liquid hot 'magma'"

www.geodynamics.com.au

Pretty cool stuff. Expensive to drill through granite though.

After all, Whitehall generate mega-watts worth of hot air, why not harness that????

Having said that, I still think the greatest untapped and renewable energy supply we have is small children, just give them a giant hamster wheel connected to a turbine and away you go!!!!

Paris, cos she's really good and getting things steamed up.

"revolutionise drilling"??

"The downside is that too much cold water going down these holes might cool the planet in a few trillenia."

The heat in the mantle and core of the earth comes from tidal forces (gravity) and is continuously generated by the combined action of the moon and the sun.

The problem is not drilling holes, or even making more power for more people to use; what we need is a human cull! If we reduce ours numbers to match ALL of our resources then we can manage just fine..... lets start with those who keep pushing for bigger,faster and better!

Uh... pressure and another hole? Pretty much in the same way steam engines work, only with the boiler way underground.

Can I research this in Hawaii? I hear they have some nice hot rocks pretty close to, if not above, the surface .

Damn someone beat me to it... www.punageothermalventure.com

A heat pump is a net user of energy, it doesn't generate it. All you're doing with a heat pump is chilling your garden slightly in order to heat your house.

It doesn't sound very practical for every house to drill two 3km holes in order to generate their own power.

Geothermal ... requires the right geology. In some places it will work. In many places it won't be economic to drill deep holes. In some places it won't be safe (will precipitate earth tremors).

Fusion ... well, ITER's costing an arm and a leg (USD9e9 ? something like that). Personally, I cannot see this as an economic solution without some serious engineering breakthroughs and enormous cost reductions.

Personally I'm hoping Robert Bussard's polywell works out. It might just save our bacon.

Steve, because he makes clever things that work.

There's enough free geothermal energy in Iceland, both near the surface and even more under it to supply Europe and North America for ever - given the high voltage direct current transmission technologies being worked on and trialled for the transfer of solar energy from the Sahara to Europe.

The water pumped up to the surface in Reykjavik frinstance is so hot (due to pressure - over 120C and probably more - can't remember offhand) that it needs to be diluted considerably with cold water to be usable by us lot in baths etc.

Similar colossal supplies would easily be able to power other continents - and to supply even more energy for more research on other methods of energy production, leading to a basically infinite supply of energy for all humanity. This would kill off private ownership of resources and commodity production for good.

(Paris cos of the earthy heat she generates...)

Ever heard of a Stirling Engine guys! Sunpower are getting some really good rates from these now. and with Nasa considering them (Testing at Cleveland whatever its called this week) they are looking like a really feasible method of converting Heat to Electricity without wasting vast amounts of heat to condesing cooling. (and putting it directly into the Atmosphere!) Stirling Engines are perfect wherever a temerature differential already exists.

If your frighted of that just try and work out what the moon is doing to us.. Each Day is becoming longer as the Moons Pull is slowly braking the earths spin (Tidal Breaking) This is because the Energy of the Tide Comes from the Earths Rotational Momentum! Fortunatly there is a lot of Energy There! however one day the earth will become graviationlly Locked to the Moon (like the moon is to us, always the same side faces us - it isnt just a coincedence!)

... apart from the rapid cooling of the interior of our planet, giving yet more turbulence to an unstable and damaged system.

Is it me or does this sound like a recipe for a planet sized bomb?

"The heat beneath the earth's surface is essentially an unlimited resource"

Um, actually no.

In the Rotorua district of North Island New Zealand, this technique has been used for many many decades. Rotorua is an area of exceptional geothermal activity and draws hordes of tourists as a result.

Unfortunately it turns out that the constant injection of cool water needed to produce steam into both domestic heating systems and the local geothermal power station has cooled the area sufficiently that geothermal activity at some of the major tourist puller sites has started to die down.

Oops!

Thanks to the stupid, sniggering schoolboy subtitle, I can't share this otherwise interesting and well-written article with approximately 50% of humanity even though they're not in the Jolt-swilling, pizza-scarfing, job-dwelling, gadget-obsessed, hip-and-with-it, totally happening fabgear demographic that you probably tout to your advertisers.

Don't you Register people have mothers, sisters, daughters, aunts etc.?

Feh.

While I understand the concept of using

"Free Heat" to drive turbines, and generate power...

It still Boggles My Mind to think...

Are'nt we suffering from GLOBAL WARMING already!

We Need A Source Of Power...

That Does NOT Generate Massive Amounts Of Heat In The Process!

...DUH...

Just put heat pumps in each and every room of the house, and be sure to connect them up to the City water supply. Yep, it is being done right now by Demarco....

In new subdivisions you can install a separte underground line apart from domestic water supply...

http://www.tradingmarkets.com/.site/news/stocks/ENCS/

Demarco is the licensed trading arm of Encore Energy

Cheers

JMF