Batteries Could Save £195m Annually By Providing Reserve Finds National Grid ESO Trial
The title of this post, is the same as that of this article on Current News.
The title gives the findings of the Arenko-led trial.
What Is The National Grid Reserve Service?
It’s all about providing capacity for the National Grid Reserve Service, which is described in this Wikipedia entry. This is the introductory paragraph.
To balance the supply and demand of electricity on short timescales, the UK National Grid has contracts in place with generators and large energy users to provide temporary extra power, or reduction in demand. These reserve services are needed if a power station fails for example, or if forecast demand differs from actual demand. National Grid has several classes of reserve services, which in descending order of response time are: Balancing Mechanism (BM) Start-Up, Short-Term Operating Reserve, Demand Management and Fast Reserve.
The Wikipedia entry is very comprehensive.
A Collateral Benefit
This is a paragraph from the article.
Additionally, unlike CCGT plants, batteries do not need to be producing power in order to provide Reserve as they can charge when there is abundant renewable energy on the grid, and then wait to react when needed. As CCGT’s need to be producing power to provide this service, it can led to renewables switched off in favour of the more carbon intensive fossil fuel generation, to ensure Reserve is available if needed.
The article concludes that Reserve from Storage could help National Grid ESO’s reach their target of net-zero operation by 2025.
Could We Replace CCGT Plants With Batteries?
CCGT or combined cycle gas-turbine power plants are efficient ways to turn natural gas into electricity.
- Typical sizes are around 800 MW.
- They are reasonably quick and easy to build.
- As their fuel comes by a pipeline, they don’t need to be connected to the rail network, unlike biomass and coal power plants.
Because they burn methane, they still emit a certain amount of carbon dioxide, although levels much less than an equivalent coal-fired power station.
In Energy In North-East Lincolnshire, I described the three Keadby power stations.
- Keadby – In operation – 734 MW
- Keadby 2 – Under construction – 840 MW
- Keadby 3 – In planning – 910 MW
In total, these three power stations will have a capacity of 2484 MW.
By comparison, Hinckley Point C will have a capacity of 3200 MW.
Add Keadby 4 and the four CCGTs would provide more electricity, than Hinckley Point C.
I think it would be very difficult to replace a cluster of CCGT gas-fired power stations or a big nuclear power plant with the sort of batteries being deployed today. 2.5 to 3 GW is just so much electricity!
I do believe though, that instead of building a 3200 MW nuclear power plant, you could build a cluster of four 800 MW CCGTs.
But What About The Carbon Dioxide?
Using the Keadby cluster of CCGTs as an example.
- Keadby 2 and Keadby 3 are being built to be upgraded with carbon-capture technology.
- The HumberZero gas network will take the carbon dioxide away for storage in worked-out gas fields in the North Sea.
- Some carbon dioxide will be fed to salad vegetables and soft fruits in greenhouses, to promote growth.
- Keadby 2 and Keadby 3 are being built to be able to run on hydrogen.
- The HumberZero network will also be able to deliver hydrogen to fuel the power stations.
I’m certain we’ll see some of the next generation of wind turbines delivering their energy from hundreds of miles offshore, in the form of hydrogen by means of a pipe.
The technology is being developed by ITM Power and Ørsted, with the backing of the UK government.
- Redundant gas pipelines can be used, to bring the hydrogen to the shore
- The engineering of piping hydrogen to the shore is well-understood.
- Redundant gas pipelines can be used if they already exist.
- Gas networks can be designed, so that depleted gas fields can be used to store the gas offshore, in times when it is not needed.
But above all gas pipelines cost less than DC electricity links, normally used to connect turbines to the shore.
I can see very complicated, but extremely efficient networks of wind turbines, redundant gas fields and efficient CCGT power stations connected together by gas pipelines, which distribute natural gas, hydrogen and carbon dioxide as appropriate.
Could Offshore Hydrogen Storage And CCGTs Provide The Reserve Power
Consider.
- Using a CCGT power station to provide Reserve Power is well understood.
- Suppose there is a large worked out gasfield, near to the power station, which has been repurposed to be used for hydrogen storage.
- The hydrogen storage is filled using hydrogen created by offshore wind turbines, that have built in electrolysers, like those being developed by ITM Power and Ørsted.
- One of more CCGTs could run as needed using hydrogen from the storage as fuel.
- A CCGT power station running on hydrogen is a zero-carbon power station.
Effectively, there would be a giant battery, that stored offshore wind energy as hydrogen.
I can see why the UK government is helping to fund this development by ITM Power and Ørsted.
Could We See Cradle-To-Grave Design Of Gas Fields?
I suspect that when a gas field is found and the infrastructured is designed it is all about what is best in the short term.
Suppose a gas field is found reasonably close to the shore or in an area like the Humber, Mersey or Tees Estuaries, where a lot of carbon dioxide is produced by industries like steel, glass and chemicals!
Should these assessments be done before any decisions are made about how to bring the gas ashore?
- After being worked out could the gas field be used to store carbon dioxide?
- After being worked out could the gas field be used to store natural gas or hydrogen?
- Is the area round the gas field suitable for building a wind farm?
Only then could a long-term plan be devised for the gas-field and the infrastructure can be designed accordingly.
I suspect that the right design could save a lot of money, as infrastructure was converted for the next phase of its life.
Conclusion
It does appear that a lot of money can be saved.
But my rambling through the calculations shows the following.
Wind Turbines Generating Hydrogen Give Advantages
These are some of the advantages.
- Hydrogen can be transported at less cost.
- Hydrogen is easily stored if you have have a handy worked-out gas field.
- The technology is well-known.
Hydrogen can then be converted back to electricity in a CCGT power station
The CCGT Power Station Operates In A Net-Zero Carbon Manner
There are two ways, the CCGT station can be run.
- On natural gas, with the carbon-dioxide captured for use or storage.
- On hydrogen.
No carbon-dioxide is released to the atmosphere in either mode.
The Hydrogen Storage And The CCGT Power Station Or Stations Is Just A Giant Battery
This may be true, but it’s all proven technology, that can be used as the Power Reserve.
Power Networks Will Get More Complicated
This will be inevitable, but giant batteries from various technologies will make it more reliable.
Could Hydrogen Replace The Need For An Electric Grid?
This article on Brink with this title is a definite must read!
It all boils down to the fact, that it’s cheaper to transport gas over long distances, than electricity.
I also suspect, that a steel pipe, which is full of inflammable gas is more difficult and less profitable to steal, than a nice meaty copper cable.
Renewable Hydrogen Will Replace Natural Gas In Millions Of Australian Households
The title of this post, is the same as that of this article on Hydrogen Fuel News.
This is the introductory paragraph.
Under a new Australian government-backed initiative, millions of households across the country will be supplied with renewable hydrogen in the place of natural gas.
The project will start in a small way by adding 10 % of hydrogen to the natural gas networks by the end of 2022.
Eventually, hydrogen will completely replace natural gas.
According to one of the comments to the article, ITM Power will supply the electrolysers.
That could be a nice little order.
Energy In North-East Lincolnshire
A few weeks ago, I took a train from Doncaster to Cleethorpes and back.
These pictures show the area is all about energy.
Keadby Power Station
Keadby power station is a 734 MW gas-fired power-station, that opened in 1996.
Keadby 2 Power Station
Keadby 2 is described on this page of the sseThermal web site.
These are the three opening paragraphs.
Keadby 2 is a new 840MW gas-fired power station in North Lincolnshire currently being constructed by our EPC contractor Siemens Energy. The project is adjacent to our operational Keadby 1 Power Station.
SSE Thermal has partnered with Siemens Energy to introduce first-of-a-kind, high-efficiency gas-fired generation technology to the UK. When completed, Keadby 2 is expected to become the cleanest and most-efficient gas-fired power station in Europe.
The station will also be capable of being upgraded to further decarbonise its generation through carbon capture or hydrogen technology, as routes to market develop.
Note.
- It will be possible to add Carbon Capture and Storage technology to Keadby 2 to make the plant net-zero carbon.
- Keadby 2 will be able to run on hydrogen.
- Keadby 2 is the under-construction power station in my pictures.
Could this be the prototype gas-fired power station of the future?
Keadby 3 Power Station
Keadby 3 is described on this page of the sseThermal web site.
These are the two opening paragraphs.
SSE Thermal is developing the option for a low-carbon combined cycle gas turbine (CCGT) at our Keadby site in North Lincolnshire, which will be known as Keadby 3.
As part of our commitment to a net zero emissions future, Keadby 3 will only be built with a clear route to decarbonisation, either using hydrogen as a low-carbon fuel, or equipping it with post-combustion carbon capture technology. The project is at the early stages of development and no final investment decision has been made.
Keadby 3 is still in the consultation and planning stage.
This newsletter on the sseThermal web site, gives some useful information about Keadby 3.
These are the first three paragraphs.
We are proposing to build a new gas fired power station at Keadby, North Lincolnshire. The project, known as Keadby 3, will have a generating capacity of up to 910 megawatts (MW) and will provide the essential back up to renewable generation and reliable and flexible energy during the country’s transition to Net Zero.
Keadby 3 will be a highly efficient gas fired power station. It will either use natural gas as the fuel and be fitted with a Carbon Capture Plant (CCP) to remove carbon dioxide (CO2) from the emissions to air from the plant, or it will be fired on primarily hydrogen, with no carbon dioxide emissions to air from its operation. Both options are currently being considered, and government is also currently considering the roles of carbon capture and hydrogen in the power sector nationally.
Keadby 3 will require connections for natural gas and possibly hydrogen fuel, water for use in the process
and for cooling and possibly for a pipeline to export the captured CO2 into a gathering network being provided by others and from there to a permanent geological storage site. An electricity connection to export the generated electricity to the UK transmission system will also be required. The plant would be capable of operating as a dispatchable low-carbon generating station to complement the increasing role of renewables in supplying the UK with electricity
Note.
- The three Keadby gas-fired power stations can generate 2484 MW of electricity in total.
- By comparison, the under-construction Hinckley Point C nuclear power station will be able to generate 3200 MW.
- The addition of a Keadby 4 power station, if it were the same size as Keadby 3, would mean the Keadby cluster of gas-fired power stations had a capacity of 3394 MW and they would be larger than the big nuclear station.
In terms of power output, it is an interesting alternative to a larger nuclear power station.
What About The Carbon?
If you’re burning natural gas, you will produce some carbon dioxide.
Power generation from natural gas creates 0.2 Kg of CO2 per kWh according to this web page.
So a 3000 MW station that produces 3000 MW, will produce 3000 MWh or 3000000 kWh in an hour.
This will create 600,000 Kg or 600 tonnes of carbon dioxide in an hour.
As there are roughly 9000 hours in a year, that is roughly 5.4 million tonnes of carbon dioxide.
This newsletter on the sseThermal web site, gives some information about sseThermal are going to do with the carbon dioxide.
As a low-carbon CCGT, Keadby 3 comprises one high efficiency gas turbine and associated steam turbine and either the infrastructure required to allow the CCGT to fire primarily on hydrogen gas, r inclusion of a post combustion Carbon Capture Plant (CCP) in a scenario where natural gas is used as the fuel. In the latter scenario, this is required in order that CO2 emissions are captured and directed to an offshore geological store through the Humber Low Carbon cluster pipeline network being developed by National Grid Ventures and partners.
A diagram of these components, and optional components, is shown below.
Note.
- Click on the image to get a larger view.
- The CCGT Power Plant is on the left.
- Most of the power is generated by the gas-turbine.
- Heat is recovered to create steam, which drives a turbine to create more electricity
- The Carbon Capture Plant is on the right.
- Carbon dioxide is extracted from the exhaust.
There are two outputs from the plant; electricity and carbon dioxide.
As the carbon dioxide is in a pipe from the drying and compression unit, it is easy to handle.
The newsletter says this about what will happen to the carbon dioxide.
CO2 emissions are captured and directed to an offshore geological store through the Humber Low Carbon cluster pipeline network being developed by National Grid Ventures and partners.
As there are several worked out gas fields in the area, there are places to store the carbon dioxide.
Storing The Carbon Dioxide
This map shows the Zero Carbon Humber pipeline layout.
Note.
- The orange line is a proposed carbon dioxide pipeline
- The black line alongside it, is a proposed hydrogen pipeline.
- Drax, Keadby and Saltend are power stations.
- Easington gas terminal is connected to around twenty gas fields in the North Sea.
- The terminal imports natural gas from Norway using the Langeled pipeline.
- The Rough field has been converted to gas storage and can hold four days supply of natural gas for the UK.
I can see this network being extended, with some of the depleted gas fields being converted into storage for natural gas, hydrogen or carbon dioxide.
Using The Carbon Dioxide
But I would prefer , that the carbon dioxide were to be put to use. Under Carbon Capture and Utilisation on Wikipedia, a variety of uses are shown.
Surprisingly, they don’t talk about using the carbon dioxide to promote the growing of crops in green houses.
I do think, though, that some clever chemists will find ways to convert the carbon into some form of advanced engineering plastics to replace steel.
Hydrogen-Fuelled Power Stations
Note how on the map the hydrogen pipeline goes through the Keadby cluster of power stations.
- Hydrogen is a zero-carbon fuel.
- It will be produced offshore by wind turbines connected to electrolysers.
- The hydrogen will be brought ashore using the existing gas pipeline network.
- Excess hydrogen could be stored in the worked out gas fields.
I suspect there will be a massive increase in the number of wind turbines in the North Sea to the East of Hull.
Hydrogen Steelmaking
In ten years time, this will surely be the way steel will be made. British Steel at Scunthorpe would surely be an ideal site.
It would also be an ideal site for the HIsarna steelmaking process, which generates much less carbon dioxide and because it is a continuous process, what carbon dioxide is generated is easily captured.
Conclusion
Installations like this will mean that large nuclear power stations built with Chinese money are not needed.
‘Build Greener’ You Say Boris? Got It. Just Say The Word, We’re Ready Here In North West England
The title of this post, is the same as that of this article on H2 View.
The article is written by Cadent‘s Network Director for the North West and what she says is a must-read.
Keadby 3 Low-Carbon Power Station
This article on Business Live is entitled Huge Green Power Station Proposed By SSE As It Embraces Hydrogen And Carbon Capture.
SSE Thermal is working on a low-carbon 910 MW gas-fired power station to join Keadby and Keadby 2 power stations in a cluster near Scunthorpe.
A spokesman for SSE is quoted as saying they will not build the plant without a clear route to decarbonisation.
On this page of their web site, SSE Thermal, say this about Keadby 3.
As part of our commitment to a net zero emissions future, Keadby 3 will only be built with a clear route to decarbonisation, either using hydrogen as a low-carbon fuel, or equipping it with post-combustion carbon capture technology. The project is at the early stages of development and no final investment decision has been made.
It should also be noted that SSE Renewables have also built a wind farm at Keadby. The web site describes it like this.
Keadby Wind Farm is England’s largest onshore wind farm. This 68MW renewable energy generation site can power approximately 57,000 homes.
There are a lot of good intentions here and I think that SSE haven’t disclosed the full picture.
It would seem inefficient to use hydrogen to power a gas-fired power station to achieve zero-carbon power generation.
- If you are using hydrogen created from steam reforming of methane, this creates a lot of carbon-dioxide.
- If you are using green hydrogen produced by electrolysis, then, why don’t you store the electricity in a battery?
Perhaps, SSE are trying out a new process?
This Google Map shows the area of Keadby to the West of Scunthorpe.
Note.
- The River Trent meandering through the area.
- Althorpe station is in the bend of the River,
- I’m fairly certain, that I remember an old airfield in the area.
- Keadby power station is a bit to the North of the waterway running West from the River and close to where the railway crosses the waterway.
This second Google Map shows a close-up of the power station.
This visualisation from SSE Thermal shows how the site might look in the future.
For me the interesting location is the village of Althorpe, where C and myself had friends.
They were always getting tourists arriving in the village looking for Princess Diana’s grave!
Carbon Capture And Storage At Keadby
If SSE have three large power stations at Keadby, a shared carbon capture and storage system could be worthwhile.
- There are numerous gas fields in the area and a big gas terminal at Theddlethorpe, to where they all connect.
- I was surprised to see, that one of thee fields; Saltfleetby is owned by President Putin’s favourite gas company; Gazprom.
- Some of these fields are actually on-shore.
- The power stations probably get their gas from the same terminal.
Some of these gas fields that connect to Theddlethorpe could be suitable for storing the carbon dioxide.
As there is masses of space at Keadby, I can see more gas-fired power stations being built at Keadby.
All would feed into the same carbon capture and storage system.
If gas was needed to be imported in a liquified form, there is the Port of Immingham nearby.
Absorption Of Carbon Dioxide By Horticulture
Consider.
- Increasingly, horticulture is getting more automated and efficient.
- Automatic harvesters are being developed for crops like tomatoes and strawberries.
- Instead of storing the carbon-dioxide in worked-out gas fields, it can also be fed directly to fruit and vegetables that are being grown in greenhouses.
- Keadby is surrounded by the flat lands of Lincolnshire.
How long will it be before we see tomatoes, strawberries, peppers and cucumbers labelled as British zero-carbon products?
Offshore Hydrogen
I’ll repeat what I said in ITM Power and Ørsted: Wind Turbine Electrolyser Integration.
This is from a press release from ITM Power, which has the same title as the linked article.
This is the introductory paragraph.
ITM Power (AIM: ITM), the energy storage and clean fuel company, is pleased to share details of a short project sponsored by the Department for Business, Energy & Industrial Strategy (BEIS), in late 2019, entitled ‘Hydrogen supply competition’, ITM Power and Ørsted proposed the following: an electrolyser placed at the wind turbine e.g. in the tower or very near it, directly electrically connected to the DC link in the wind turbine, with appropriate power flow control and water supplied to it. This may represent a better design concept for bulk hydrogen production as opposed to, for instance, remotely located electrolysers at a terminal or platform, away from the wind turbine generator, due to reduced costs and energy losses.
Some points from the remainder of the press release.
- Costs can be saved as hydrogen pipes are more affordable than under-water power cables.
- The proposed design reduced the need for AC rectification.
After reading the press release, it sounds like the two companies are performing a serious re-think on how wind turbines and their links to get energy on-shore are designed.
- Will they be using redundant gas pipes to bring the hydrogen ashore?
- Will the hydrogen come ashore at Theddlethorpe and use the existing gas network to get to Keadby?
It sounds inefficient, but then the steelworks at Scunthorpe will probably want masses of hydrogen for carbon-free steel making and processing.
Boosting Power Station Efficiency
There is also a section in the Wikipedia entry for Combined Cycle Power Plant called Boosting Efficiency, where this is said.
The efficiency of CCGT and GT can be boosted by pre-cooling combustion air. This is practised in hot climates and also has the effect of increasing power output. This is achieved by evaporative cooling of water using a moist matrix placed in front of the turbine, or by using Ice storage air conditioning. The latter has the advantage of greater improvements due to the lower temperatures available. Furthermore, ice storage can be used as a means of load control or load shifting since ice can be made during periods of low power demand and, potentially in the future the anticipated high availability of other resources such as renewables during certain periods.
So is the location of the site by the Trent, important because of all that cold water?
Or will they use surplus power from the wind farm to create ice?
The Proposed North Sea Wind Power Hub
The North Sea Wind Power Hub is a proposed energy island complex on the Eastern part of the Dogger Bank.
- The Dutch, Germans and Danes are leading the project.
- Along with the Belgians, we have been asked to join.
- Some reporting on the Hub has shown, airstrips in the middle of the complex to bring the workforce to the site.
- A Dutch report, says that as much as 110 GW of wind power could be developed by 2050.
- We are also looking at installing wind farms on our section of the Dogger Bank.
Geography says, that one of the most convenient locations to bring all this electricity or hydrogen gas ashore is North Lincolnshire
A Very Large Battery
I would also put a very large battery on the site at Keadby.
One of Highview Power‘s proposed 1 GWh CRYOBatteries would be a good start. This will be four times the size of the 250 MWh CRYOBattery, which the company is currently designing and building at Carrington in Greater Manchester.
Conclusion
The three power stations at Keadby are the following sizes
- Keadby 1 – 734 MW
- Keadby 2 – 803.7 MW
- Keadby 3 – 010 MW
This adds up to a total of 2447.7 MW. And if they fit carbon capture and storage it will be zero-carbon.
Note.
- Hinckley Point C is only 3200 MW and will cost around £20 billion or £6.25 billion per GW.
- Keadby 2 power station is quoted as costing £350 million. or £0.44 billion per GW.
These figures don’t include the cost of carbon capture and storage, but they do show the relatively high cost of nuclear.
Two UK GDNs Considering New Fleet Of Zero-Emission Hydrogen Vehicles
This title of this post, is the same as that of this article on Hydrogen Fuel News.
This is the introductory paragraph.
Two UK gas distribution networks (GDNs) are investigating the potential of operating fleets of zero-emission hydrogen vehicles. The goal would be to use H2 fuel to shrink the carbon output from their fleet, aligning with the UK government’s Net Zero 2050 targets.
This surely is a good idea, as it says all the right things to their customers.
HyDeploy
I could have called this post; What Do You Do With Surplus Electricity?.
Believe it or not, one thing you can do is inject it into the gas main, by converting it into hydrogen first.
The Project
The concept is being tested in a project called HyDeploy at Keele University.
- The project has its own web site, from where I have obtained much of the information on this post.
- Keele University has its own gas network.
- Keele has a campus population similar to a small town.
- Keele University has a reputation for research excellence.
This paragraph outlines the project.
HyDeploy is a pioneering energy demonstration to establish the potential for blending hydrogen, up to 20%, into the normal gas supply so that we can reduce carbon dioxide (CO2) emissions.
A 10 month live demonstration of blended gas is taking place on part of the Keele gas network and will finish in August 2020.
HyDeploy will help to determine the level of hydrogen which can be used by customers safely and with no changes to their existing domestic appliances.
The HyDeploy project has been split into the following phases.
- Phase One will be live test using the Keele University gas network to learn about injecting hydrogen into a natural gas network.
- Phase Two will move to a larger demonstration on public network in the North East.
- Phase Three will be another large demonstration in the North West.
Once the evidence has been submitted to Government policy makers, we very much expect hydrogen to take its place alongside other forms of zero carbon energy in meeting the needs of the UK population.
The Electrolyser
ITM Power are providing the 0.5 MW electrolyser to turn electricity into hydrogen.
It’s only a small one, but this is about proving the technology.
Thoughts On Last Week’s Major Power Outage
This article on the BBC is entitled Major Power Failure Affects Homes And Transport.
This is the first two paragraphs.
Nearly a million people have been affected by a major power cut across large areas of England and Wales, affecting homes and transport networks.
National Grid said it was caused by issues with two power generators but the problem was now resolved.
This second article on the BBC is entitled UK power cut: Why it caused so much disruption, and gives these details.
It started with a routine blip – the gas-fired power station at Little Barford in Bedfordshire shut down at 16:58 BST due to a technical issue.
Then, a second power station, the new Hornsea offshore wind farm, also “lost load” – meaning the turbines were still moving, but power was not reaching the grid.
These are my thoughts on the incident.
Power Stations Do Fail
Any complex electro-mechanical system like Little Barford gas-fired power station or Hornsea offshore wind farm can fail.
- Little Barford gas-fired power station was built in 1994 and is a 746 MW gas-fired power station.
- Hornsea offshore wind farm obtained planning permission in 2014 and is being built in phases. It will eventually have a maximum capacity of 8 GW or 8,000 MW.
Compare these figures with the iconic coal-fired Battersea power station, which had a maximum output of 503 MW in 1955.
I will not speculate as to what wet wrong except to say that as the Hornsea wind-farm is relatively new, it could be what engineers call an infant mortality problem. Complex systems or even components seem to fail in the first few months of operation.
Why Do We Have Gas-Fired Stations?
According to this page on Wikipedia, there are around forty natural gas fired power stations in England.
Most gas-fired stations are what are known as CCGT (Combined Cycle Gas Turbine), where a Jumbo-sized gas-turbine engine is paired with a steam turbine powered by the heat of the exhaust from the engine.
This form of power generation does produce some carbon dioxide, but to obtain a given amount of electricity, it produces a lot less than using coal or ioil.
By combining the gas turbine with a steam turbine, the power station becomes more efficient and less carbon dioxide is produced.
Power stations of this type have three various advantages.
- They have a very fast start-up time, so are ideal power stations to respond to sudden increases in electricity demand.
- As they are a gas-turbine engine with extra gubbins, they are very controllable, just like their cousins on aircraft.
- They are relatively quick, easy and affordable to build. The Wikipedia entry for a CCGT says this. “The capital costs of combined cycle power is relatively low, at around $1000/kW, making it one of the cheapest types of generation to install.”
- They don’t need a complicated and expensive transport infrastructure to bring in coal or nuclear fuel.
- They can also be powered by biogas from agricultural or forestry waste, although I don’t think that is a comm practice in the UK.
The carbon dioxide produced is the only major problem.
Gas-Fired Power Stations In The Future
If you read the Wikipedia entry for combined cycle power plants, there is a lot of information on CCGTs, much of which is on various ways of improving their efficiency.
I believe that one particular method of increasing efficiency could be very applicable in the UK.
Under Boosting Efficiency in the Wikipedia entry, the following is said.
The efficiency of CCGT and GT can be boosted by pre-cooling combustion air. This is practised in hot climates and also has the effect of increasing power output. This is achieved by evaporative cooling of water using a moist matrix placed in front of the turbine, or by using Ice storage air conditioning. The latter has the advantage of greater improvements due to the lower temperatures available. Furthermore, ice storage can be used as a means of load control or load shifting since ice can be made during periods of low power demand and, potentially in the future the anticipated high availability of other resources such as renewables during certain periods.
The UK is the world’s largest generator of power using offshore wind and as we are surrounded with sea and wind, the UK is only going to produce more of the power it needs in this or other way.
This method could be used to store the wind energy produced when the demand is low and recover it, when it is needed.
Could The UK Develop A Chain Of Carbon-Neutral Gas-Fired Power Stations?
In parts of the UK, there is a unique mix of resources.
- A plentiful supply of natural gas, either from offshore fields or interconnectors to Norway.
- Large amounts of electricity generated by offshore wind, which will only get larger.
- Worked out gas-fields still connected to the shore, through redundant platforms and pipes.
- Closeness to agricultural areas.
Technologies under development or already working include.
- Offshore creation of hydrogen using electricity generated by offshore wind and then using the redundant gas pipes to bring the hydrogen to the shore.
- Using a hydrogen-fired CCGT power station without producing any carbon-dioxide.
- Feeding carbon dioxide to plants like salad and fruit to make them grow better.
- Using excess electricity from renewable sources to cool the air and improve the efficiency of CCGT power stations.
I can see all these technologies and development coming together in the next few years and a chain of carbon-neutral gas-fired power stations will be created
- Hydrogen produced offshore on redundant gas platforms, using electricity from nearby wind farms, will be turned back into electricity, where it is needed by onshore hydrogen-fired power stations.
- Redundant gas platforms will be refurbished and reused, rather than demolished at great expense.
- Some natural gas will still be used for power generation
- I’m not quite sure, but I think there could be dual-furled CCGTs, that could run on either hydrogen or natural gas.
- Any carbon dioxide generated will be stored in the worked out gas fields or fed to the crops.
- Gas storage onshore will ensure that the gas-fired power station can respond quickly.
I also believe that there is no technological and engineering challenges, that are too difficult to solve.
This strategy would have the following advantages.
- It should be carbon-neutral.
- Because there could have as many as two hundred individual power stations, the system would be very reliable and responsive to the loss of say a cluster of five stations, due to a tsunami, a volcanic eruption or a major eathquake.
- If power from renewable sources like offshore wind is low, extra stations can be quickly switched in.
- It is not dependent on fuel from dodgy dictators!
- It would probably be more affordable than developing nuclear power stations.
There is also the possibility of bringing more hydrogen onshore to be used in the decarbonisation of the gas-grid.
Conclusion
A chain of carbon-neutral gas-fired power stations, linked to hydrogen created offshore by wind farms is very feasible.
Last week, after the double failure, extra stations would have immediately been switched in.
Energy Storage
The fastest response system is energy storage, where a giant battery holds several gigawatt-hours of eklectricity.
Electric Mountain
The biggest energy storage facility in the UK is Dinorwig Power Station.
This is the introduction to its Wikipedia entry.
The Dinorwig Power Station , known locally as Electric Mountain, is a pumped-storage hydroelectric scheme, near Dinorwig, Llanberisin Snowdonia national park in Gwynedd, northern Wales. The scheme can supply a maximum power of 1,728-megawatt (2,317,000 hp) and has a storage capacity of around 9.1-gigawatt-hour (33 TJ)
It is large and has a rapid response, when more electricity is needed.
We probably need another three or four Electric Mountains, but our geography means we have few suitable sites for pumped-storage, especially in areas, where large quantities of electricity are needed.
There are one other pumped-storage system in Wales and two in Scotland, all of which are around 350 MW or a fifth the size of Electric Mountain.
In the Wikipedia entry entitled List Of Power Stations In Scotland, this is said.
SSE have proposed building two new pumped storage schemes in the Great Glen; 600 MW at Balmacaan above Loch Ness, and 600 MW at Coire Glas above Loch Lochy, at £800m. Scotland has a potential for around 500 GWh of pumped storage
I’m sure the Scots will find some way to fill this storage.
If all else fails, there’s always Icelink. This is the description from Wikipedia.
Icelink is a proposed electricity interconnector between Iceland and Great Britain. As of 2017, the project is still at the feasibility stage. According to current plans, IceLink may become operational in 2027.
At 1000–1200 km, the 1000 MW HVDC link would be the longest sub-sea power interconnector in the world.
The project partners are National Grid plc in the UK, and Landsvirkjun, the state-owned generator in Iceland, and Landsnet, the Icelandic Transmission System Operator (TSO)
Plugging it in to Scotland, rather than London, probably saves a bit of money!
Conclusion
Increasing our pumped-storage energy capacity is feasible and would help us to survive major power failures.
Batteries In Buildings
Tesla have a product called a Powerwall, which puts energy storage into a home or other building.
This was the first product of its kind and there will be many imitators.
The Powerwall 2 has a capacity of 13.5 kWh, which is puny compared to the 9.1 GWh or 9,100,000 kWh of Electric Mountain.
But only 674,074 batteries would need to be fitted in the UK to be able to store the same amount of electricity as Electric Mountain.
The big benefit of batteries in buildings is that they shift usage from the Peak times to overnight
So they will reduce domestic demand in the Peak.
Conclusion
Government should give incentives for people to add batteries to their houses and other buildings.
Could Hydrogen Work As Energy Storage?
Suppose you had a hydrogen-fired 500 MW hydrogen-fired CCGT with a hydrogen tank that was large enough to run it at full power for an hour.
That would be a 0.5 GWh storage battery with a discharge rate of 500 MW.
In an hour it would supply 500MWh or 500,000 kWh of electricity at full power.
In Hydrogen Economy on Wikipedia, this is said, about producing hydrogen by electroysis of water.
However, current best processes for water electrolysis have an effective electrical efficiency of 70-80%, so that producing 1 kg of hydrogen (which has a specific energy of 143 MJ/kg or about 40 kWh/kg) requires 50–55 kWh of electricity.
If I take the 40 KWh/Kg figure that means that to provide maximum power for an hour needs 12,500 Kg or 12.5 tonnes of hydrogen.
Under a pressure of 700 bar, hydrogen has a density of 42 Kg/cu. m., so 12.5 tonnes of hydrogen will occupy just under 300 cubic metres.
If I’ve got the figures right that could be a manageable amount of hydrogen.
Remember, I used to work in a hydrogen factory and I had the detailed guided tour. Technology may change in fifty years, but the properties of hydrogen haven’t!
Gas-Fired Versus Coal-Fired Power Stations
Consider.
- The problem of the carbon dioxide is easier with a gas-fired power station, than a coal-fired power station of the same generating capacity, as it will generate only about forty percent of carbon dioxide.
- Gas-fired power stations can be started up very quickly, whereas starting a coal-fired power station probably takes all day.
- Coal is much more difficult to handle than gas.
Using hydrogen is even better than using natural gas, as it’s zero-carbpn.
Conclusion
I believe we can use our unique geographic position and proven technology to increase the resilience of our power networks.
We need both more power stations and energy storage.
Cadent Launches Report Mapping Out Routes To Hydrogen Fuelled Vehicles On UK Roads
The title of this post is the same as that of this article on Gasworld.
This is the first paragraph.
A roadmap using hydrogen to decarbonise transport, particularly commercial transport, in the North West of the UK, has been unveiled by the country’s leading gas distribution network Cadent.
The article makes some points about hydrogen-powered transport.
- Using Cadent’s network to deliver hydrogen, rather than tube trailers, massively reduces the cost and makes fuel cell electric cars (FCEVs) available to the general public for around the same price as a battery electric vehicle or a conventional diesel car.
- FCEVs can travel further than battery electric vehicles and take the same time to refuel as a conventional petrol car.
- Grid-supplied hydrogen is the most cost-effective way of supplying hydrogen transport fuel at the required volume – up to six times cheaper than if delivered by trailer and 70 per cent cheaper than electrolysis.
Cadent‘s interest in all this, is not about selling gas, as their interest and income is totalling in transporting gas from producers to end users. So they don’t care whether they transport natural gas or hydrogen.
Hydrogen Storage
The article also discloses plans of INOVYN, a wholly owned subsidiary of INEOS, to develop a grid-scale hydrogen storage facility.
It will be in salt caverns in mid-Cheshire.
It will be able to hold 2,000 tonnes of hydrogen.
It is cheaper to store hydrogen in salt caverns, than on the surface.
The salt caverns have been used to store gas for decades.
This is a quote from the INOYN spokesman.
Storage is a vital component of delivering a viable hydrogen energy system in the UK.
I only had an indirect quick glimpse underground, when I worked at ICI in the area around 1970, but ICI’s salt expert, said they had enough salt in Cheshire to last 9,000 years at the current rate of extraction.
Salt in Cheshire, is a unique geological formation, that is very valuable to the UK and it looks like in the future, thar could enable hydrogen power.
Hydrogen Generation
The hydrogen will still need to be produced. Wikipedia has an entry caslled Hydrogran Production, which is fairly dismissive of electrolysis.
But in my view, hydrogen could be produced by electrolysis using wind power, as other methods like steam reforming of methane produce carbon-dioxide.
I particularly like the idea of building wind farms in clusters around offshore gas platforms, that have extracted all the gas from the fields, they were built to serve.
- Instead of running electricity cables to the wind farms, hydrogen is produced by electrolysis on the platform and this is transported to the shore using the same gas infrastructure, that brought the natural gas onshore.
- This could enable wind-farms to be developed much further offshore.
- If carbon capture is ever successfully made to work, the existing gas pipe could also be used to transfer the carbon dioxide offshore for storage in worked-out gas fields.
- The pipe between platform and shore could easily be made reversible, carrying hydrogen one way and carbon dioxide the other.
All of the technology required would also appear to be fully developed.
Conclusion
I am convinced that in the next few years, a hydrogen gas network can be created in parts of the UK.
The North West has advantages in becoming one of the first parts of the UK to have an extensive hydrogen network.
- It has the means to produce hydrogen gas.
- It has large wind farms in Liverpool Bay.
- There are worked-out gas fields, that might in the future be used for carbon storage.
- If INOVYN can store large quantities of hydrogen, this is a big advantage.
The biggest problem would be converting large numbers of houses and commercial premises from natural gas to hydrogen.
But, we’ve been through that process before, when we changed from town gas to natural gas in the 1960s and 1970s.
Should We Remove Gas From Our Houses?
I only use gas for heating.
- I feel that naked flames are not a good idea to have anywhere near people, as they can produce oxides of nitrgen, that causes health problems.
- Gas cookers are also a major cause of household fires.
- Technology is moving against cooking with gas, as more more to electric induction hobs.
- If you are fitting a new gas boiler, make sure it can be connected to hydrogen.
When I buy my next property, it will be all electric.
The Anonymous Widower 