Saturday 29 March 2008

The man making 'wind bags'

Seamus Garvey wants to "store the wind".

He believes the future of energy is storing it as compressed air in giant bags under the sea.

And a major power company has invested in the scheme.

Professor Garvey, a long-time proponent of compressed air, feels vindicated by the research grant.

He said: "As the country and the whole world moves toward using more renewable energy, we're going to need energy storage."

His idea would utilise familiar renewable sources - wind, waves and tidal power.
But Professor Garvey does not believe we should be forced to "use it or lose it" when conditions are best.

Energy would instead be used to compress and pump air into underwater bags, anchored to the seabed.

When energy demand is highest, the air would be released through a turbine, converting it to electricty.

full article

Monday 24 March 2008

Call for delay to biofuels policy

The UK's chief environment scientist has called for a delay to a policy demanding inclusion of biofuels into fuel at pumps across the UK.

Professor Robert Watson said ministers should await the results of their inquiry into biofuels' sustainability.

Some scientists think biofuels' carbon benefits may be currently outweighed by negative effects from their production.

The Renewable Transport Fuels Obligation (RTFO) is to introduce 2.5% biofuels at the pumps from 1 April.

Professor Robert Watson warned that it would be insane if the RTFO had the opposite effects of the ones intended.

He said biofuels policy in the EU and the UK may have run ahead of the science.

His comments in an interview with BBC Radio 4's Today programme appear on the day when a coalition of pressure groups from Oxfam to Greenpeace writes to the Department for Transport (DfT) demanding that the policy be delayed until after the review.

full article

Friday 21 March 2008

Solar-power paint lets you generate as you decorate

A lick of solar-power paint could see the roofs and walls of warehouses and other buildings generate electricity from the sun, if research by UK researchers pays off. The scientists are developing a way to paint solar cells onto the steel sheets commonly used to clad large buildings.

Steel sheets are painted rapidly in steel mills by passing them through rollers. A consortium led by Swansea University, UK, hopes to use that process to cover steel sheets with a photovoltaic paint at up to 40 square metres per minute.

The paint will be based on dye-sensitised solar cells. Instead of absorbing sunlight using silicon like conventional solar panels, they use dye molecules attached to particles of the titanium dioxide pigment used in paints.

That gives an energy boost to electrons, which hop from the dye into a layer of electrolyte. This then transfers the extra energy into a collecting circuit, before the electrons cycle back to the dye.

While less efficient than conventional cells, dye-based cells do not require expensive silicon, and can be applied as a liquid paste.

full article

Wednesday 19 March 2008

Power station harnesses Sun's rays


There is a scene in one of the Austin Powers films where Dr Evil unleashes a giant "tractor beam" of energy at Earth in order to extract a massive payment.

Well, the memory of it kept me chuckling as I toured the extraordinary scene of the new solar thermal power plant outside Seville in southern Spain.

From a distance, as we rounded a bend and first caught sight of it, I couldn't believe the strange structure ahead of me was actually real.

A concrete tower - 40 storeys high - stood bathed in intense white light, a totally bizarre image in the depths of the Andalusian countryside.

The tower looked like it was being hosed with giant sprays of water or was somehow being squirted with jets of pale gas. I had trouble working it out.

In fact, as we found out when we got closer, the rays of sunlight reflected by a field of 600 huge mirrors are so intense they illuminate the water vapour and dust hanging in the air.

The effect is to give the whole place a glow - even an aura - and if you're concerned about climate change that may well be deserved.

It is Europe's first commercially operating power station using the Sun's energy this way and at the moment its operator, Solucar, proudly claims that it generates 11 Megawatts (MW) of electricity without emitting a single puff of greenhouse gas. This current figure is enough to power up to 6,000 homes.

But ultimately, the entire plant should generate as much power as is used by the 600,000 people of Seville.

It works by focusing the reflected rays on one location, turning water into steam and then blasting it into turbines to generate power.

full article