Tag Archives: cheap

New technologies promise cheap wave power Updated for 2026





All along the coasts of Europe where the Atlantic waves crash onto the shore there are experimental wave power stations producing electricity.

Now engineers in Norway and Sweden – two of the countries trying hardest to develop this technology – have announced “breakthroughs” in their methods, which the inventors believe will make wave power competitive.

At present, most wave power stations are small-scale. All of them work, but making them commercially viable to compete economically with other renewables and fossil fuels has so far eluded their inventors.

The latest Norwegian experiment has been installed in a redundant fishing vessel in the Stadthavet area of West Norway, an area designated for renewable energy testing.

Like all the best ideas, it is simple. “In principle, it works almost like a bicycle pump”, explains engineer and project manager Edgar Kvernevik, of Kvernevik Engineering AS, who has spent much of his working life designing and building vessels.

‘Bicycle pump principle’

The makers have installed four large chambers in the vessel’s bow. As the waves strike the vessel, the water level in the chambers rises. This creates an increase in air pressure, which in turn drives four turbines – one for each chamber.

The pitch of the vessel also contributes by generating additional air pressure in the chambers when the wave height is large. The design of the chambers is such that they work in response to different wave heights, which means that the energy is exploited very effectivel, says Kverneviky:

“The plant thus produces electricity with the help of what is called a fluctuating water column. All we have to do is to let the vessel swing at anchor in a part of the ocean with sufficient wave energy. Everything is designed to be remotely-controlled from onshore.

“This floating power plant has also been equipped with a special anchoring system, which means that it is always facing into the incoming waves. This ensures that the plant is in the optimal position at all times.”

The turbines on the deck of the vessel continue to work regardless of whether the chambers are inhaling or exhaling air as the wave runs past the vessel.

Hydrogen production at sea

Researchers in Stadthavet, which has a high average wind velocity, have also been studying the idea of floating wind turbines. The project is now looking at combining wind turbines and wave power plants on the same vessel and using the electricity to create hydrogen gas – a way of storing the energy.

“We see this project as a three-stage rocket”, Kvernevik says. “The first stage is to test the model we have just built to make sure that electricity generation can be carried out as planned. Next, a hydrogen production plant will be installed on board the vessel so that the electricity generated can be stored in the form of hydrogen gas.

“We have high hopes that hydrogen will be the car fuel of the future. Our aim is to work with others to produce hydrogen at a competitive price – based on an infinite resource and involving no harmful emissions.

“The plan is then to construct a plant with a nominal capacity of 1000kW (1MW). We will do this by installing five production modules similar to the current plant, either on a larger vessel or a custom-built barge. Finally, we will build a semi-submersible platform designed to carry a 4MW wave power plant with a 6MW wind turbine installed on top.”

The Norwegian Marine Technology Research Institute (MARINTEK) is one of the project partners that have contributed towards the development of the wave power plant.

Reliable source

Meanwhile, a Swedish company claims to have cracked the problem of scaling-up wave energy with a gearbox that generates five times as much power per tonne of device at one third of the cost.

One of the obvious problems with wave power is the height and timing of the waves, making it difficult to convert the power into a reliable energy source. But CorPower Ocean‘s new wave energy system claims to produce three to four times more power than traditional systems.

Patrik Möller, CorPower’s chief executive, says the wave energy converter – in contrast to competing systems – can manage the entire spectrum of waves:

“We can ensure that it always works in time with the waves, which greatly enhances the buoy’s movement and uses it all the way between the wave crest and wave trough and back in an optimal way, no matter how long or high the waves are.”

The new system that helps to solve this problem is based in a buoy that absorbs energy from the waves – a scaled-up version of a heart surgeon’s research into heart pumping and control functions.

The buoys are compact and lightweight and can be manufactured at a relatively low cost. A buoy 8 metres in diameter can produce 250-300 kW in a typical Atlantic swell. A wave energy park with 100 buoys can generate 25-30 MW.

 


 

Paul Brown writes for Climate News Network

 

 




390607

Straw homes are a cheap and green fix for the housing crisis Updated for 2026





The UK construction sector must reduce its energy consumption by 50% and its carbon emissions by 80% by 2050.

So radical changes are needed to the way we approach building houses. Straw could be a critical part of the transition towards a low-carbon future.

The thermal insulation value of a typical straw bale wall meets the requirements of even the most demanding performance specifications.

Recent research led by the BRE Centre for Innovative Construction Materials at the University of Bath has shown that straw bale buildings reduce energy bills by 90% compared to conventional housing stock.

The manufacture of cement, used in concrete, is responsible alone for up to 8% of all industrially produced greenhouse gas emissions. Using natural materials such as straw, often directly from the field and with little further processing, significantly reduces this impact.

Traditionally, the environmental impact of construction materials has been significantly less than the impact of occupation (heating, cooling and so on) over the lifespan of the building. However, in modern energy efficient buildings the proportion attributable to that ’embodied’ in the fabric of the building is expected to increase to at least 90%.

Measures to reduce the impact of the embodied energy and carbon will deliver even more environmentally friendly buildings.

A natural building material

Straw is just the dried stalks of plants stripped of their grain. You don’t really ‘make straw’ – it’s a co-product of grain production, an established and essential agricultural process. So using straw doesn’t displace land required for essential food production.

In the UK more than 7m tonnes of straw remains after the production of wheat, and up to half this amount is effectively discarded due to its low value – simply chopped up and returned to the soil.

As an average three-bedroom house needs 7.2 tonnes of straw, the ‘leftover’ could be used to build more than 500,000 new homes – a city the size of Birmingham could be built each year using discarded straw.

Straw is also a low-cost material. But more importantly, as a plant it captures and stores atmospheric carbon dioxide during photosynthesis. By using more and more straw in buildings we are creating a natural carbon storage bank.

Though the bible references using straw for bricks – and thatched roofs – have been common for centuries, modern straw construction was developed when mechanical baling machines were first used in late 19th-century Nebraska.

Stacked like large bricks, straw bales can be used for modest loadbearing as well as non-loadbearing walls. The oldest surviving straw bale building is around 100 years old.

But straw has never caught on as an alternative to bricks, concrete or timber. There are concerns about its poor durability, fire resistance, the way it attracts mice and rats and, as one of the three little pigs found out the hard way, its lack of structural integrity.

The answer – high precision pre-fabricated ‘bales’

Straw bales aren’t currently made to the same levels of tolerance and specification as bricks or cement. The fact they’re generally slightly different sizes combined with the need to keep bales dry during construction has meant most builders would not, until recently, consider straw bales a viable solution for anything. Other than perhaps for enthusiastic self-builders.

However, the development of prefabricated wall panels using straw bale for insulation has now provided the opportunity to market straw to the mainstream construction industry.

Prefabrication, or off-site manufacture, means that wall panels can be made to a very high specification in a factory, protected from variable weather conditions that would otherwise inhibit on-site building with straw.

A prefabricated product can be certified as fit for use by industry bodies, making it much more acceptable to builders, financiers and insurers. It also radically reduces site construction times, with houses able to be erected in ten weeks instead of around 16 weeks for more conventional buildings. It seems the time has arrived for straw bale construction.

For the past ten years the University of Bath has been working with a local company, ModCell, to develop prefabricated straw bales. We started out looking at straw as a low-carbon cladding solution and soon moved on to developing panels that could bear heavy loads. Now, we are able to make low-energy prefabricated straw bale houses.

 

Bath’s own straw house. The panels from 00:09 onwards are all prefab straw and lime plaster.

Officially approved for the formal construction sector

The panels have been subjected to fire tests, thermal transmittance tests, accelerated weathering tests, acoustic tests, simulated flooding and impact testing. We’ve even tested the structures in a simulated hurricane force wind, in what has been termed the ‘big bad wolf’ test: the panels and prototype BaleHaus passed with flying colours.

These panels have now been granted certification. This in turn means insurers will cover straw houses and home-buyers will be able to obtain mortgages.

Hayesfield School in Bath, EcoDepot in York and the School of Architecture at the University of the West of England have all made use of these panels. Certification means the housing market can now use straw too, with LILAC in Leeds completed in 2013 and now a new development in Bristol due for completion later this year, with proposals for larger schemes already in planning.

Modern prefabricated straw bale houses are affordable, deliver excellent levels of energy efficiency in use for the home-owner or occupier and provide a genuine sustainable solution by using a cheap and widely available agricultural co-product.

Other similar prefabricated systems using straw bale construction have been developed in Australia, Belgium and Canada. Entire communities, towns or even cities built from straw bales. And why not?

 


 

Pete Walker is Director, BRE Centre for Innovative Construction Materials at the University of Bath.

This article was originally published on The Conversation. Read the original article.

The Conversation

 




390068

Farmageddon – the true cost of cheap meat Updated for 2026





Whatever happened that led a great part of humankind to give the animal kingdom such a lowly status in the overall evolutionary pattern of life on Earth?

How is it that we have subjected millions and millions of our animal cousins to concentration camp conditions so utterly abhorrent that to call their brief time on the planet ‘living’ would constitute a serious misnomer?

One of the critical factors that drove me to develop a mixed organic farming system back in the mid 1970’s, was to give the cows, pigs, sheep and hens that formed the basis of my farming enterprise, the chance to grow up in a setting designed to replicate as closely as possible the conditions that these creatures would experience in their native environment.

It is important to recognise that farming is an enclosed agricultural system which has built-in compromises deemed necessary for the controlled raising of both livestock and crops. Within this context we have to be aware that the word ‘natural’ does not accurately describe this scenario, even when the best and most humane principles and methods are applied.

However, those who embark upon an organic farming management practice commit to a set of standards that places strong emphasis on animal welfare as well as forming a close affinity with the soil and the cyclic patterns of nature that underlie rotational, non chemical farming practices.

Under such a system the farmer has the chance to develop a strong affinity with nature and a deep respect for the animals and plants under his or her care. But unfortunately, the great majority of people living in post industrial Westernised societies ingest a daily diet that has little or nothing to do with such a caring approach.

On the contrary, the majority of individuals negotiating their way through 21st century urban and suburban life styles demand cheap, uniform foods that, in order to fulfil the consumers’ supermarket groomed expectations, are grown according to methods that are about as different from ‘natural’ as plastic is to wood.

Enter the factory farm …

Philip Lymbery and Isobel Oakshot, in their book ‘Farmageddon – the True Cost Cheap Meat‘ have gone to great lengths to raise awareness of just how devious and deceptive is the globalised ‘cheap food’ conveyor belt that churns out the Western World’s daily diet.

Philip Lymbery is the director of Compassion in World Farming, a remarkable farmer pioneered organisation formed in 1967 which now has worldwide offices and an equally eclectic swelling membership.

I met Philip on a number of occasions during the 1990’s and recall his quietly profound concerns about the state of our toxic food chain with its heavy reliance upon animals given next to no chance to express their normal psychological needs and fundamental freedoms.

At that time Philip was somewhat sceptical of the Soil Association’s welfare standards for organically raised livestock which I and my colleagues were moulding and refining for publication, seeing any form of commercial farming as synonymous with animal exploitation.

I understood his reticence: too many organisations make unrealistic and sometimes downright untruthful claims for the production methods that they espouse. Who hasn’t seen those adverts depicting perfect looking farmsteads full of ‘happy hens’, smiling cows and contented pigs rooting around in ye oldie traditional farmyards – and then ends by displaying a mass produced product that bears no relationship whatsoever with such scenes.

The hell we inflict on the animals that feed us

During their specially planned world trip that makes up the body of evidence in this book, Philip Lymbery and Elizabeth Oakshot, political editor of The Sunday Times, come across scenes which would incriminate the perpetrators to a lifetime in gaol if the World possessed a justice system that dispensed genuine justice for man and beast alike.

On describing their visit to the hen houses of the UK’s largest egg supplier in Nottinghamshire, the authors state: “The egg farm was a series of giant sheds clad in corrugated iron. Inside were a million hens. Throughout their short seventy two week life span (chickens can live eight to ten years) they would never see daylight.

“They lived in cages around five metres long, known in the business as ‘colonies’. Suspended lights brightened and dimmed at particular times to create the impression of night and day, all geared to regulating the egg-laying process.”

Pigs, suffer a very similar fate to hens and a chapter in the book is devoted to laying bare the tortuous conditions suffered by the great majority of large scale pig farms which supply the main supermarket chains.

In the part of the voyage that takes them to the USA the authors report how, in California, thousands of dairy cows (8,000 in one herd is not unusual) are milked to death in vast purpose built mechanised sheds featuring robotic cow carousels and antibiotic laced genetically modified feeds dispensed by automatic conveyors.

The whole thing working around the clock in what is the ultimate ‘factory farm’ format. The unfortunate animals that must endure this hideous regime are milked-out after just two to three years and sold off into the ubiquitous hamburger trade.

There is an alternative!

By contrast, my organically managed Guernsey herd of forty cows lived an average of fourteen years, very rarely needing any form of vetinary intervention throughout their milking careers.

This is due to the fact that we never pushed our cows to produce maximum yields, always treating them with respect and love while feeding them a diet of home grown grasses and clovers plus other green matter that fulfils the natural needs of herbivorous ruminant quadrupeds.

The glorious unpasteurised milk and cream that resulted was eagerly purchased by the local community and I seldom needed to go further than ten miles to complete my sales round.

Farmageddon also plunges into the fish farming phenomena; another form of concentration camp where fish are kept in intense confinement with high rates of mortality and where sea lice proliferate leading to a catastrophic decline of wild fish stocks.

‘The illusion of cheap food’ is smashed to smithereens as the reader is taken behind the largely closed doors of a ruthless global multinational industry supplying the World’s largest supermarket chains and industrial food giants.

To the authors’ credit, they never sensationalise the shocking scenes they witness, preferring to simply convey the facts and expose the reality of a brazenly exploitive empire conveniently sanitized and dressed-up as a caring, quality controlled production system bringing you, the consumer, everything you could ever wish for and all in the air conditioned convenience of your local hypermarket food dispenser.

Fortunately, the reader is guided towards both personal and more general solutions, under such headings as “how to avoid the coming crisis” and “consumer power – what you can do”. They are both pragmatic and realistic guides for the perplexed – sensibly encouraging readers to buy ‘local’ from producers one comes to trust and respect. Not wasting food by over-buying and avoiding over-eating meat products.

Human health is recognised as being dependent upon soils, animals and plants being treated as vital living organisms whose optimum growth is achieved by using natural ingredients and through the adoption of a caring, loving attitude, that is the antithesis of the subhuman battle ground that epitomizes the twenty first century factory farm.

All in all, I would strongly recommend this book to anyone who wants a grounded, undiluted account of the machinations of the global food industry and its devastating affect on the lives of millions of sentient beings, including ourselves.

 


 

The book:Farmageddon – the True Cost Cheap Meat‘ is written by Philip Lymbery and Isobel Oakshot and published by Bloomsbury.

Julian Rose is an early pioneer of UK organic farming, writer, broadcaster and activist. He is currently the President of the International Coalition to Protect the Polish Countryside. His most recent book ‘In Defence of Life – A Radical Reworking of Green wisdom’ is published by Earth Books. Julian’s website is www.julianrose.info.

 

 




389904