Coal-fired Power Stations

Andrew Percy Excerpts

Wednesday 29th June 2011 Westminster Hall

[Mr Spencer]

I thank the hon. Gentleman for that intervention and that is exactly the point—there is this gap and we must find a way to fill it. A Government of whatever colour have to address this issue quickly and grab it with both hands, because we cannot afford to be in a position where that gap increases and we cannot keep the power on. I therefore commit myself to supporting him in lobbying Government to ensure that we fill that gap. I hope that the Minister will reassure us at some point that we can fill it.

CCS is a means of mitigating the contribution of fossil fuel emissions to global warming. The process is based on capturing CO₂ from large point sources, for example power stations, and storing it in such a way that it does not enter the atmosphere. CCS can also be used to describe the “scrubbing” of CO₂ from ambient air as a geo-engineering technique. Although CO₂ has been injected into geological formations for various purposes, the long-term storage of CO₂ is a relatively new concept. The first commercial example of its use was at Weyburn in 2000.

I want to explore the three groups into which CCS can be split: post-combustion; pre-combustion; and oxyfuel.

[Andrew Percy (Brigg and Goole) (Con)]

I congratulate my hon. Friend on securing this debate, not least because I live opposite Drax power station, which is the most efficient, cleanest and biggest coal-fired power station in the country. Is he aware of the consultation that is going on in my own village of Airmyn today, between 2pm and 7pm, which relates to the National Grid’s proposal for a CCS pipeline that would serve the steelworks at Scunthorpe as well as the power stations across north-west and south Yorkshire? As I say, that consultation is going on at the moment. That pipeline is an exciting prospect and it offers the possibility of extending the life of some of our power stations.

[Mr Spencer]

I thank my hon. Friend for that intervention. In fact, I have the Drax report here in front of me and I know that he is working very actively to ensure that his constituents are well represented in that consultation. Drax is a very good example of what can be achieved. The work that it has done in blending biomass with coal to improve its carbon footprint is an example of how we can improve things with the technology that exists today. Also, working with other industries, such as the steel industry, is quite an exciting prospect and I welcome that happening; in fact, I recognise that that good work is ongoing.

Flue gas desulphurisation is not a new technology. It has been used for some time. Ratcliffe-on-Soar, the largest power station near my own constituency, has introduced a great deal of new technology to capture the sulphur emitted from the power unit. FGD is simple, actually. It basically works by mixing limestone with water, which is then sprayed into the power station chimneys through which the flue gases pass after the coal is burned. The sulphur in the flue gas reacts chemically with the injected spray and forms calcium sulphate, with only a small proportion of the sulphur being ejected into the atmosphere. The resultant slurry is then pumped away, dried and made into gypsum, which is beneficial to the power station and can be used to generate income for it. FGD equipment also allows coal-fired plants to meet the requirements of the EU large combustion plant directive.

The second group of CCS technologies is integrated gasification combined cycle, which is a pre-combustion technology. IGCC is a near-zero-emissions clean coal solution for the UK. It would significantly reduce CO₂ emissions as well as providing pressurised gas for injection into North sea oilfields, thereby enhancing the recovery of oil reserves, which is known as enhanced oil recovery. Powerfuel is now constructing one of Britain’s first IGCC clean coal power stations in Yorkshire, again using British coal from an adjacent colliery. I will try to put the process into simple language. It sometimes becomes very difficult to extract crude oil from wells and there is a technique whereby the CO₂ can be mixed to reduce the viscosity of the oil, allowing the oil to be removed from the wells more easily.

Super-critical power plant is a type of clean coal technology whereby it is possible to retrofit this technology to the power stations that we already have. The benefits of operating a super-critical power plant over a conventional plant are clear. Conventional boilers have an operating efficiency of about 30%, which means only 30% of the energy in the coal is converted into electricity with the rest being lost as heat. Super-critical boilers have efficiency levels of around 42% to 46%, so more energy is directed to turning the turbines to generate electricity and therefore less greenhouse gas is produced per kilowatt-hour. Improving the efficiency of boilers used in coal-fired power stations not only reduces CO₂ emissions, because less coal is needed to generate the heat energy that turns the steam turbines, but it results in higher generator efficiencies in the provision of the electricity. The boilers are available commercially and can be retrofitted to existing coal-fired plants, which means no major retraining of staff, faster deployment and reduced capital costs with greater efficiency. It seems like a win-win situation to me.

Doosan Babcock Energy has stated that Britain could cut the cost of reducing greenhouse gases by £3 billion if it fitted such clean technology to its ageing power stations. Lobbying goes on for Government to introduce a form of incentive for power generators—one similar to the renewables obligation certificates—to invest in clean coal technology. Creating such an incentive seems the right thing to do and I hope that this debate will assist the Government in some of their thinking, and perhaps we can consider supporting this technology.

Doosan Babcock Energy says that applying this technology to existing coal-fired power stations would be the equivalent of erecting 7,000 to 10,000 wind turbines. Members in Westminster Hall today who have had the pleasure of a local application for a wind turbine will be relieved that we could reduce the number of those applications, one of which I currently have in my constituency. Typical construction costs for current coal-fired power station designs are in the region of £700,000 to £900,000 per megawatt. More advanced integrated gasification combined gas cycle plants cost between £900,000 and £1.3 million per megawatt, although lower capital costs of £750,000 to £900,000 per megawatt are predicted as technology moves forward and we become better at fitting it. The 2002 energy review by the performance and innovation unit put the costs of coal-fired power stations in the 3p to 3.5p per kilowatt-hour range by 2020. That would make coal competitive with nuclear power, if the costs of decommissioning nuclear power stations were included.

Briefly, I want to explore carbon abatement capture. The idea of carbon capture is simple and powerful. The CO₂ must be segregated from the fossil fuel combustion products and deposited in a place where it will remain. The CO₂ emissions from a clean coal plant will be reduced to virtually zero if the plant has been designed to store the carbon. The CO₂ can then be disposed of in, for example, the emptying fields of the North sea, where it can consequently extend the life of those oil fields by applying pressure to an old and difficult-to-extract reserve, thereby prolonging production. I shall try to put that into layman’s terms. The gas is pumped into the hole where the oil is coming from, which assists in removing some of the oil, and stores the CO₂ back underground, where the carbon was for millions of years. It is a three-step process, of capturing the CO₂ from the power plant, transporting it—as my hon. Friend the Member for Brigg and Goole (Andrew Percy) said—to another place via a pipeline, and finally storing or using it.

The British Geological Survey estimates that the potential carbon dioxide storage in the UK sector of the North sea is 775 gigatonnes. That is a considerable amount, given that worldwide CO₂ output is 8 gigatonnes annually, and it means that in the North sea alone there could be almost a century’s worth of CO₂ storage for the whole world. That is a fantastic statistic, which proves that we have the storage available as long as we can embrace it and find a way, via the technology, to make use of it.

Carbon capture and storage in a coal-fired plant would cost just over £20 per tonne of CO₂, while the figure for a gas-fired plant is about £30 a tonne. It could be argued that that is because a coal plant produces more, but coal is certainly cheaper per tonne than gas for CO₂ emitted. Using CO₂ for enhanced oil recovery can generate revenue that offsets the other costs of CCS. The cost of storing CO₂ in aquifers is close to £l per tonne, and the cost of storing it in oil and gas field plants ranges from £1 to £20 per tonne. Therefore, as well as being fairly reasonable, this method could generate income if we can get it right and make it work. Depleted oil and gas fields are the first sites to be considered for storage capacity because they are known to be equipped with infrastructure such as pipelines and platforms, and are almost ready to run now.

The other area that I really want to explore, and which I know my predecessor as MP for Sherwood, Paddy Tipping, and his predecessor Andy Stewart explored, is underground coal gasification. This is a method of converting unworked coal into a combustible gas, which can be used for industrial heating, power generation and the manufacture of hydrogen, synthetic gas or diesel fuel. The basic UCG process involves drilling two wells into the coal, one for the injection of oxidants and another—some distance away—for bringing the product gas to the surface. I acknowledge that the process involves a number of challenges, not least of which is whether once the process has been started it can be controlled, and there are also the impacts on subsidence above surface level, depending on what happens to the coal below ground. Nevertheless, we should consider using UCG for reserves under the sea. Cost estimates of UCG clean gas stand at £2.50 a gigajoule, whereas the current price of national gas is £6 a gigajoule.

As for the economic merits, clean coal is competitive, with an estimated generating cost of between 2p and 3.5p per kilowatt-hour. Wind power, for example, costs between 3.7p and 5.5p per kilowatt-hour. The Government seem fairly committed at this moment in time to wind power, but when the costs are added up and the subsidies stripped out it is not as competitive as some of the other available technology. Clean coal is also more acceptable to constituents than erecting large wind turbines in the vicinity of their homes.

[Mr Spencer]

The hon. Gentleman is absolutely correct, and I will cite some statistics later that support his view. Offshore wind has a role to play in assisting electricity generation but we do require that base load. I do not want to overemphasise this, but when the World cup final half-time whistle goes or when everyone wants to cook their turkey on Christmas day, we have to have the capacity to lift that generation. However, the Government currently do not have the power to control the wind and can rely only on what is available.

[Andrew Percy]

I have issues with onshore wind, but I never miss an opportunity to sell the Humber for its offshore wind capacity, particularly in front of the Minister. Is it not a bit of a false argument that we are in favour of either one technology or the other? What my hon. Friend and the Government are saying is that we want a broad mix. A technology that is not as far advanced as perhaps it should be is tidal, to which I understand the Government have just committed some money. It is not about being on one side of the argument; it is about being on all sides and having a balanced energy mix.

[Mr Spencer]

It is true that we need to take a balanced view and ensure that we explore the new technologies. I think that tidal and wave power are great, and if they work they will contribute a small amount to this nation’s energy security. The important thing to note though is that it will be a small amount, because those technologies do not have a large enough share of the market. The number of areas where we could secure a tidal scheme—the Severn estuary is one example—is small, and there are no opportunities to generate enormous amounts of electricity via such schemes. I acknowledge that we need a mixed portfolio, but that works only if there is something there to pick up the base load. The crux of my argument is that the only methods that can be used to pick up the base load are nuclear power and coal-fired power stations, and we are not in a position to build nuclear power stations fast enough to plug the inevitable gap.

On the merits of clean coal technology for the environment, the biggest long-term problem for coal is its carbon dioxide level. Approximately 90% of the CO₂ produced by a coal-fired power station could be captured with CCS, and CCS could help to make up to 20% of the global cuts in emissions that are needed by 2050. Therefore, if we can find the technology that will work, we can sell it to the world, continue to use coal and at the same time cut the amount of CO₂ being released into the atmosphere.

Owing to their substantial carbon emissions, coal-fired power stations are currently considered environmentally unacceptable. That is simply because we are looking at the technology of the 1960s and 1970s, rather than at what is available now and might be available in future. Coal-fired power gets a bit of a poor press, but some of what is said about it is not true.

The UK has the opportunity to be at the forefront of developing clean coal technology. That would not only be beneficial to the UK, but be a very effective way of helping developing countries, notably China and India, to take advantage of their own coal reserves in a way that is considered environmentally acceptable. We find ourselves in a situation in which the Department for International Development is funding the World Bank, which in turn is funding electricity generation in other parts of the world, and those countries are spending that cash on coal-fired power stations, which are not as environmentally friendly as they could be. If we can find a way to make the technology work and embrace it, we could sell it to other parts of the world or donate it as part of our aid programme to the more challenged parts of the world, which would benefit the planet and those more challenged countries as well.

It is vital that we are at the forefront of development. That could lead to a whole new industry. Selling the technology and building it for the world would generate enormous amounts of cash and jobs for the UK. If we are not at the forefront of its development, other countries will jump ahead of us and we will lose the opportunity. This great nation of ours has always been at the cutting edge of technology, and certainly of engineering, and we need to maintain that tradition if we possibly can.

The process of coal gasification can capture 90% of CO₂ emissions for storage and can also produce a synthetic gas, known as “syngas”, which is 99.5% pure hydrogen. The beauty of that fuel is that, once fired through a conventional gas turbine, the only emission is water vapour. Although cleaning up the existing plants is welcome, it will not have the impact that those who want to reduce our CO₂ emissions significantly require, nor will it capture any CO₂ for alternative income generation. Coal gasification is the only process that changes one form of energy—coal—into another flexible energy source—hydrogen—but without a clear Government energy policy, IGCC technology will not happen. To be viable, the new IGCC plants require the same allocation of CO₂ allowances as existing coal plants, but at present they receive the allowances for a CCGT-fired—combined cycle gas turbine—power station.

So far, generating electricity from coal has failed the environmental test because of its carbon emissions, but clean coal offers a number of strategic advantages, including the ability to ensure sustainable and competitively priced electricity and to offset security issues and the cost of importing from volatile countries in the middle east and Russia, which is key. In the past, when I challenged Ministers who said that they were more than comfortable with our arrangements with overseas suppliers, they pointed me to the fact that we have imported a vast amount of our food over the past 50 years and we have certainly never been too concerned about that. The arrangement has worked very well, but it is important to recognise that that has been during a period in which food production has been on an enormous scale and food has been plentiful. The situation may change the second we reach a position where we are short of food.

Russia decided last year not to export a single grain of wheat. That had an enormous impact on global wheat prices overnight. I can see us in a situation in which a very similar thing happens to energy. We all remember images on the news of French lamb farmers blockading their ports and stopping imports of British lamb. Such images stick with me. Can we really depend on our neighbours when we are up against the wall? Will they look after their own taxpayers and can they look after British taxpayers at the same time? That makes me very nervous. Such situations make me think that we should ensure that we are on a secure footing and that we have enough energy in the UK to supply ourselves.