Bill payers are being fracked over by misleading claims from Cameron

Even if shale gas does bring down bills, we may need to wait 15 years for it to do so. The government's narrow focus is selling the public short.

Fracking made the headlines yesterday as Caroline Lucas was among protestors apparently outnumbered by police in Balcombe. As Lucas was being dragged off to sit in the back of a police van and reflect on her part in the "mass civil disobedience", protestors elsewhere were superglueing themselves to the London offices of PR agency Bell Pottinger, representatives of energy company Cuadrilla.

The protestors have focused largely on the environmental consequences of fracking but many others will be interested in the potential for fracking to bring down their bills, as David Cameron has claimed it will. But this claim is misleading: even if shale does bring down bills, which is highly uncertain, we may need to wait 15 years for it to do so. With the right conditions in place, fracking has a place in the UK but it offers no protection to bill payers from the high and rising cost of energy.

It makes no sense to import gas we can produce at home, especially if the process creates thousands of jobs and billions of pounds in tax revenues. For this reason we should back fracking as a way to develop the UK’s vast shale gas reserves. According to a recent study, there are shale beds containing 40 trillion cubic metres of natural gas in the north of England.

Support for fracking should not, however, be accompanied by a weakening of the UK’s commitment to reduce its carbon emissions. Gas has a vital role to play for years ahead as a bridging fuel on our way to a near-zero carbon energy system and as a back-up to renewable forms of generation. As long as our legislated decarbonisation targets stay in place and are adhered to, fracking can have a part to play.

While fracking could bring benefits, it will not help households who are feeling the pinch from high energy bills, at least not any time soon. There are two main reasons for this. First, it is not clear how much it will cost to develop shale gas in the UK. The peculiarity of UK shale reserves is a key factor here. Also important is how communities respond to the prospect of fracking in their area: if developers face protests nationwide as they have in Balcombe then clearly costs could be high. Second, and crucially, the price of gas in the UK is set by the price of imports through international markets. One analysis suggests we may need to drill 10,000 wells to offset the need for imports, which, if achievable, could take 15 years.

So, what about householders, who have their seen their energy bills rise by £360 or 60% from 2004 to 2011 and face yet another round of bill increases before the year is out? The government’s preoccupation with all things shale is selling them short.

To be protected from bill increases, householders need to improve the energy efficiency of their properties. The main policy that should support households in doing so, the Green Deal, is not delivering: 130,000 households were expected to sign up to the scheme this year but so far only 306 have. The government should be doing everything it can to get this scheme moving, which means introducing more incentives to simulate demand, looking at ways to reduce the cost of loans that are available and supporting area-based schemes as much as possible.

Some households, the 'fuel poor', struggle with high energy bills more than most. Locating these households is hard and to do so the government should adopt an area-based strategy, centred on local authorities. Local health bodies could also play a key role in these schemes.

Debate on the role for shale gas will not die down any time soon but the government’s argument that it will help bill payers won’t ring true for many years to come.

Protesters form a blocade outside a drill site operated by Cuadrilla on August 19, 2013 in Balcombe, West Sussex. Photograph: Getty Images.

Reg Platt is a Research Fellow at IPPR. He tweets as @regplatt.

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Inside Big Ben: why the world’s most famous clock will soon lose its bong

Every now and then, even the most famous of clocks need a bit of care.

London is soon going to lose one of its most familiar sounds when the world-famous Big Ben falls silent for repairs. The “bonging” chimes that have marked the passing of time for Londoners since 1859 will fall silent for months beginning in 2017 as part of a three-year £29m conservation project.

Of course, “Big Ben” is the nickname of the Great Bell and the bell itself is not in bad shape – even though it does have a huge crack in it.

The bell weighs nearly 14 tonnes and it cracked in 1859 when it was first bonged with a hammer that was way too heavy.

The crack was never repaired. Instead the bell was rotated one eighth of a turn and a lighter (200kg) hammer was installed. The cracked bell has a characteristic sound which we have all grown to love.

Big Ben strikes. UK Parliament.

Instead, it is the Elizabeth Tower (1859) and the clock mechanism (1854), designed by Denison and Airy, that need attention.

Any building or machine needs regular maintenance – we paint our doors and windows when they need it and we repair or replace our cars quite routinely. It is convenient to choose a day when we’re out of the house to paint the doors, or when we don’t need the car to repair the brakes. But a clock just doesn’t stop – especially not a clock as iconic as the Great Clock at the Palace of Westminster.

Repairs to the tower are long overdue. There is corrosion damage to the cast iron roof and to the belfry structure which keeps the bells in place. There is water damage to the masonry and condensation problems will be addressed, too. There are plumbing and electrical works to be done for a lift to be installed in one of the ventilation shafts, toilet facilities and the fitting of low-energy lighting.

Marvel of engineering

The clock mechanism itself is remarkable. In its 162-year history it has only had one major breakdown. In 1976 the speed regulator for the chimes broke and the mechanism sped up to destruction. The resulting damage took months to repair.

The weights that drive the clock are, like the bells and hammers, unimaginably huge. The “drive train” that keeps the pendulum swinging and that turns the hands is driven by a weight of about 100kg. Two other weights that ring the bells are each over a tonne. If any of these weights falls out of control (as in the 1976 incident), they could do a lot of damage.

The pendulum suspension spring is especially critical because it holds up the huge pendulum bob which weighs 321kg. The swinging pendulum releases the “escapement” every two seconds which then turns the hands on the clock’s four faces. If you look very closely, you will see that the minute hand doesn’t move smoothly but it sits still most of the time, only moving on each tick by 1.5cm.

The pendulum swings back and forth 21,600 times a day. That’s nearly 8m times a year, bending the pendulum spring. Like any metal, it has the potential to suffer from fatigue. The pendulum needs to be lifted out of the clock so that the spring can be closely inspected.

The clock derives its remarkable accuracy in part from the temperature compensation which is built into the construction of the pendulum. This was yet another of John Harrison’s genius ideas (you probably know him from longitude fame). He came up with the solution of using metals of differing temperature expansion coefficient so that the pendulum doesn’t change in length as the temperature changes with the seasons.

In the Westminster clock, the pendulum shaft is made of concentric tubes of steel and zinc. A similar construction is described for the clock in Trinity College Cambridge and near perfect temperature compensation can be achieved. But zinc is a ductile metal and the tube deforms with time under the heavy load of the 321kg pendulum bob. This “creeping” will cause the temperature compensation to jam up and become less effective.

So stopping the clock will also be a good opportunity to dismantle the pendulum completely and to check that the zinc tube is sliding freely. This in itself is a few days' work.

What makes it tick

But the truly clever bit of this clock is the escapement. All clocks have one - it’s what makes the clock tick, quite literally. Denison developed his new gravity escapement especially for the Westminster clock. It decouples the driving force of the falling weight from the periodic force that maintains the motion of the pendulum. To this day, the best tower clocks in England use the gravity escapement leading to remarkable accuracy – better even than that of your quartz crystal wrist watch.

In Denison’s gravity escapement, the “tick” is the impact of the “legs” of the escapement colliding with hardened steel seats. Each collision causes microscopic damage which, accumulated over millions of collisions per year, causes wear and tear affecting the accuracy of the clock. It is impossible to inspect the escapement without stopping the clock. Part of the maintenance proposed during this stoppage is a thorough overhaul of the escapement and the other workings of the clock.

The Westminster clock is a remarkable icon for London and for England. For more than 150 years it has reminded us of each hour, tirelessly. That’s what I love about clocks – they seem to carry on without a fuss. But every now and then even the most famous of clocks need a bit of care. After this period of pampering, “Big Ben” ought to be set for another 100 or so years of trouble-free running.

The Conversation

Hugh Hunt is a Reader in Engineering Dynamics and Vibration at the University of Cambridge.

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