Showing posts with label renewable energy. Show all posts
Showing posts with label renewable energy. Show all posts

Saturday, 22 June 2013

A dash for wood and wind - two medieval technologies, and "picking losers"

My headline is quoting Matthew White Ridley, 5th Viscount Ridley, FRSL, FMedSci, DL, better known to us proles as Matt Ridley, author of "The Rational Optimist" and other worthy reads. Greenie Watch has posted a speech he made in the House of Lords on 18th inst. I disagree with John Ray, the brain and fingers behind Greenie Watch, on a few topics, but I'm mostly in either agreement or sympathy with his sentiments. On this occasion, he has chosen not to comment on the speech, and I follow his lead; any comment is superfluous.

Viscount Ridley: My Lords, I begin by declaring an interest in coal-mining on my family’s property, as detailed in the register, but I shall not be arguing for coal today but for its most prominent rival, gas, in which I have no interest.

I thank my noble friend the Minister for her courtesy in discussing the Bill and welcome the fact that the Government have grasped the nettle of energy policy, especially on the issue of nuclear power, after the deplorable vacuum left by the previous Government. However, I am concerned that we are being asked in the Bill to spend £200 billion, mainly on the wrong technologies, and that we will come to regret that. We are being asked to put in place a system that will guarantee far into the future rich rewards for landowners and capitalists, while eventually doubling the price of electricity and asking people to replace gas with electric space heating. That can only drive more people into fuel poverty.

We have heard a lot about the needs of energy investors and producers. We have not heard enough about consumers. If the industry gets an 8% return on the £200 billion to be spent, just two offshore wind farms or one nuclear plant would be declaring profits similar to what British Gas declares today. That will be an uncomfortable position for the Government of the day.

The Bill is a dash for wood and wind—two medieval technologies—and it is twice as big as the dash for gas of the 1990s. Between 6 and 9 gigawatts will have to be built a year for the next 16 years, compared with 2 gigawatts a year during the dash for gas. I am not sure it can be done, let alone affordably. In the case of biomass, the only way we can source enough is by felling trees overseas. As the noble Lord, Lord Berkeley, said, Drax will soon be taking more than 40 trains a day of wood pellets from North America. That is not energy security.

Under the Bill,
“‘low carbon electricity generation’ means electricity generation which in the opinion of the Secretary of State will contribute to a reduction in emissions of greenhouse gases”.
Shades of Humpty Dumpty: a word means just what I choose it to mean. We are being asked to pretend that the most carbon rich fuel of all, wood, is not a source of carbon. According to Princeton University, trees used for biomass electricity generation increase carbon dioxide emissions by 79% compared with coal over 20 years and by 49% over 40 years, even if you replant the forest. We are through the looking glass.

Offshore wind, meanwhile, is a risky technology with a track record of engineering problems, sky- high costs, disappointing lifespan and problems of decommissioning. At the moment, we generate less than 1% of total energy, or 6% of electricity, from wind, despite all the damage it has already done to our countryside and economy. We are to increase that to something like 30% in just a decade or so, may be more if nuclear is delayed. It is a huge gamble, and if it fails, the only fallback is carbon capture and storage, a technology that has repeatedly failed to meet its promises at all, let alone affordably, a point made earlier by the noble Baroness, Lady Liddell.

Even if this wood and wind dash is possible, under the contract for a different system proposed in this Bill, while better than the renewable obligations that preceded it, the subsidy to renewable energy will quadruple by 2020. That is only the start. On top of that, there are system costs for balancing the unpredictability of wind; transmission costs for getting wind from remote areas to where it is needed; VAT; the carbon floor price; not to mention the cost of subsiding renewable heat and renewable transport fuels. Hence, at a conservative estimate, the Renewable Energy Foundation thinks that we will be imposing costs of £16 billion a year on our hard-pressed economy for several decades.

Why are we doing this? We are doing this because of four assumptions that were valid in 2010 but, as my noble friend Lord Lawson pointed out, are no longer valid to the same extent. First, we assumed we would not be acting alone, so we would not damage our competitiveness. Instead, not only is there no longer a Kyoto treaty, but China is planning to build 363 coal- fired power stations; India 455. On top of that, the European trading system has collapsed to less than €5 a tonne of carbon. Our carbon floor price is more than three times that: £16 a tonne, rising to £32 a tonne in 2020 and £76 a tonne in 2030. Acting unilaterally in this way does not save carbon emissions. It merely exports them and the jobs go with them. Northumberland’s largest employer, the aluminium smelter at Lynemouth, has closed with the loss of 500 jobs, almost entirely because of carbon policies.

The second assumption behind the Bill was that the cost of gas would rise, thus making the cost of energy rise anyway. The Committee on Climate Change said recently in a report that:
“Consensus projections are that gas prices will rise in future”.
This remark has been described by the utilities team at Liberum Capital as “genuinely amazing” in the light of recent events. Now that we know that gas prices have plummeted in the United States to roughly one-quarter of ours, thanks to shale gas; now that we know that Britain probably has many decades worth of shale gas itself; now that we know that enormous reserves of offshore gas near Israel, Brazil and parts of Africa are going to come on line in years to come; now that we know that conventional gas producers such as Russia and Qatar are facing increasing competition from unconventional and offshore gas; now that we know that methane hydrates on the ocean floor are more abundant than all other fossil fuels put together and that the Japanese are planning to explore them; in short, now that we know we are nowhere near peak gas, it is surely folly to hold our economy hostage to an assumption that gas prices must rise.

We will need the gas anyway. The intermittent nature of wind means that we will require increasing back-up and we cannot get it from nuclear because it is not responsive enough to fill the lulls when the wind drops. Far from replacing fossil fuels, a dash for wood and wind means a dash for gas too, only this time we will have to subsidise it because the plants will stand idle for most of the time and pay a rising carbon floor price when they do operate. Having distorted the markets to disastrous effect with subsidies to renewables, we are now being asked, under the capacity market mechanism, to introduce compensating countersubsidies to fossil fuels.

The third assumption was that the cost of renewables would fall rapidly as we rolled them out. This has proved untrue and, indeed, as the Oxford Institute of Energy Studies has shown, the cost curve for renewables inevitably rises as the best sites are used up, not least in the North Sea. I am told by those who work in the offshore wind industry that, at the moment, the industry has every incentive to keep its costs up not down, as it sets out to strike a contract with the Government. They will not have to try very hard. Even at low estimates, offshore wind is stratospherically expensive.

The fourth assumption on which this Bill is based was that the climate would change dangerously and soon. Once again, this assumption is looking much shakier than it did five years ago. The slow rate at which the temperature has been changing over the past 50 years and the best evidence from the top-of-the-atmosphere radiation about climate sensitivity are both very clearly pointing to carbon dioxide having its full greenhouse effect but without significant net positive feedback of the kind on which all the alarm is based. The noble Baroness, Lady Worthington, and the noble Lord, Lord Stern, both mentioned Professor Myles Allen and they will be aware, therefore, of his recent paper, which found significantly reduced climate sensitivity. If that is the case, the dash to wind and biomass may well continue to do more harm to the environment as well as to the economy for many decades than climate change itself will do.

However, leaving that on one side, as my noble friend Lord Lawson said, the argument against subsidising wind and biomass does not depend on a benign view of climate change. It stands powerfully on its own merits, even if you think dangerous climate change is imminent. In 1981, my noble friend Lord Lawson, ignoring the prevailing wisdom of the day, as he sometimes does, decided against the predict-and-provide central planning philosophy and instead embraced the idea of letting the market discover the best way to provide electricity. The result was the cheapest and most flexible energy sector of any western country.

We have progressively turned our backs on that. Under this Bill, the location, the technology and the price of each power source is determined by one person—the omniscient Secretary of State. Recent occupants of that position have an unhappy history of not making wise decisions. Remember ground source heat pumps? They do not work as advertised. Remember electric vehicles? They have been a flop. Remember biofuels? They have caused rainforest destruction and hunger. Remember the Green Deal? Must we go on making these mistakes?

We have returned to a philosophy of picking winners, or rather, from the point of view of the consumer, of picking losers. Not even just picking losers, but hobbling winners, because of the obstacles we have put in the way of shale gas. America has cut its carbon emissions by far more than we have, almost entirely because of shale gas displacing coal. By pursuing a strategy that encouraged unabated gas, we could halve emissions and cut bills at the same time. Instead, I very much fear we will find we have spent a fortune to achieve neither.

Monday, 2 April 2012

Light a candle for Earth Hour?

Did you celebrate and support "Earth Hour"? Do you support 100% "renewable" energy? Did you turn off all electric lights and light a candle? If you did, did you contemplate what the candle was made of? Did you realise it's paraffin wax? Did you know paraffin wax is a by-product of oil refining?

Why didn't you know?

"The wind is always blowing somewhere"

Read or heard that before? It's the trite and ill-defined "argument" used by proponents of wind power. "Wind is variable" they intone, but "the wind is always blowing somewhere", and will provide sufficient power for "all our needs". The first part of the claim is undoubtedly true; the wind is indeed "always blowing somewhere", but unfortunately for them, and for the rest of us too, it depends entirely on where that "somewhere" is, and a few other important factors. Let me tell you a story.

The time is the future, some twenty years hence. I propose a mythical small country Aeolia, named after Aeolus, the Greek god of the winds, a son of Poseidon, appropriately enough the god of the sea, over which most winds originate. Aeolia is a large island off the coast of Europe, and has large wind turbines spread evenly round the coast, and across the hillier parts. The entire country is crossed by high-voltage power lines linking the turbines to the centres of population. Tourists don't visit Aeolia in droves as they used to. The Aeolian government ascribes it to the high exchange rate and visa controls. They omit to mention the 60% increase in tourism in nearby Francia, which has 100% of its power supplied by nuclear power stations, and an almost total absence of large white towers (apart from the Eiffel Tower, now painted white to reflect solar radiation and so cool their capital, Paris). The Aeolians closed their nuclear stations years ago; their energy minister called nuclear power "unproven and dangerous technology" while in opposition, and before being handed the "poisoned chalice" of office. Francia's neighbour Germania, closed theirs because they were apparently worried about tsunami inundation, in a large country with little ocean shoreline

When the prevailing south-westerly wind blows steadily over Aeolia, all is well. The turbines to the west and south run at about 2/3 rated output, Those on the hills about the same, but the remainder progressively less towards the east and north; especially the east, which is for the most part in the lee of hills, The Aeolians aren't stupid, they have allowed for that in the number of turbines built. When the south-westerlies abate a little, the west and south produce a little less power, as do the hill-top ones; those in the extreme north and east produce almost none. The Aeolians aren't stupid, they have allowed for that in the number of turbines built.

Occasionally, a meteorological phenomenon known as a "blocking high" (large area of high pressure) with little or no wind beneath covers most of the country, and the turbines are stilled. The Aeolians aren't stupid, they have allowed for that by importing power from Francia, through an enormous underwater cable; that country generates more power than it needs, and exports about 25% of it. Other countries around Francia have adopted the "Aeolia model" and get all of their power, most of the time, from wind. They also have large cables to France to import surplus power when the wind dies away, and so all is well. Happy days!

The wind doesn't always waft over Aeolia from the southwest. It almost as often comes from the other points of the compass, and doesn't maintain its direction nor strength as well as wind from the southwest. The Aeolians aren't stupid, they have allowed for that in the number of turbines built.

Very occasionally, though the Aeolians can't remember the last time it happened, a very large  "blocking high" covers most of western Europe. If that were to happen, Aeolia and Francia's other neighbours would be requesting power from Francia, but Francia has only 25% of its power to export, even if all the nuclear stations run flat out. It can't supply the "top-up" needs of but one of its neighbours, or a fraction of their needs to all. The Aeolians aren't stupid, they have allowed for that by building large gas-fired power stations that spend most of their time idling at the ready, burning gas just to maintain that state. The gas is imported, even though almost the entire country is sitting on vast reserves of shale-gas. It remains untouched since their energy minister called "fracking" (using high-pressure water to force out the gas, used since the 1950s) "untried technology".

The northern part of the Aeolian archipelago is the small independent country of Scotia, which went all out for both political and energy independence almost two decades ago. They have a number of wind and tidal stations, but import 60% (on average) of their power as gas and electricity from across the sea, from Norwegia, which is 100% hydro-electric, and whose citizens luckily have a soft spot for the Scots, who they maintain are really Norwegian anyway.

The story doesn't end there, but since the the Aeolians aren't stupid, and have built sufficient turbines to meet their power needs most of the time, how may would that be, and how many would they need if the wind was blowing in just 25% of their country, meaning the wind really was "always blowing somewhere" in their country? As we've seem the "always blowing somewhere" might well mean far away.

Taking the ideal "south-westerly" or "Goldilocks" (it's just right) scenario, the number of turbines would have to be increased countrywide by about 25 % if the wind drops a bit. If it drops a bit in the west and south, it drops a lot more in the sheltered north and east; some turbines would be below threshold speed and produce nothing. If the "always blowing somewhere" area with "a bit less wind" was only half or even 25% of the country, that already increased number of turbines would have to be multiplied by two or four. This means the total must be as many as five times the "Goldilocks" number. Chinese manufacturers would be building new turbine factories faster than Aeolia and other "it's a breeze" countries could erect new turbines.

This analysis is, of course completely ignoring the inherent minute-to-minute, hour-to-hour variability of the wind; that can be partially "evened out" by each "farm" having a large battery attached which can be charged using excess power, and discharged to fill the troughs in output. But, and it's a big but, that capacity has to be quite large to even out more than minute-to-minute variability, and these batteries are expensive. They wouldn't be a "nice to have", they'd be a necessity. Gas-powered backup can't be ramped up and down on even an hour-to-hour basis, more like over four to eight hours. Wind forecasts would have to be almost continuous and very reliable.

Short-term variability between large areas is a bigger problem, one that hasn't been addressed anywhere worldwide, to my knowledge. My position on wind is this - large-scale generation and integration is very difficult. Wind won't work on its own, and even with power storage and gas-fired backup is very difficult and expensive to manage 24 hours a day. Wind would be ideal for remote and isolated communities, villages and farms, especially in the undeveloped world; small-scale battery storage is viable and not very expensive. Combined with solar (photo-electric or hot water) systems and integrated storage they could and would provide electric power and heating for people who now have nothing but wood and dried cow-dung or limited supplies of expensive (for them) diesel and petrol. Their "half a loaf" would be welcomed, and I'm sure they could organise themselves around a variable supply. In my opinion wind (and solar) could lift millions, if not billions out of poverty, improve their health, pump clean water from wells (especially using excess off-peak power), and even supply small factory units. I'd gladly see some of my taxes funding such projects, and I'm sure many others would too.

World political leaders tell us of their "visions" of cheap, clean energy for their countries. They never mention the magic word "reliable".

This post was, in part, inspired by a "conversation" with Peter Lang, who describes himself as
... a retired geologist and engineer with 40 years experience on a wide range of energy projects throughout the world, including managing energy R&D and providing policy advice for government and opposition. His experience includes: coal, oil, gas, hydro, geothermal, nuclear power plants, nuclear waste disposal, and a wide range of energy end use management projects. 
I hope to write several other less "mythological" posts about the realities of "renewable energy" soon.