Tag: BECCS (bioenergy with carbon capture and storage)

How do you store CO2 and what happens to it when you do?

22 April 2020

Carbon capture
Sunrise over Saltwick Bay, Whitby, North Yorkshire

The North Sea has long shaped British trade. It’s also been instrumental in how the country is powered, historically providing an abundant source of oil and natural gas. However, this cold fringe off the North Atlantic could also play a vital role in decarbonising the UK’s economy – not because of its full oil and gas reservoirs, but thanks to its empty ones.

In an effort to limit or reduce the amount of carbon dioxide (CO2) in the atmosphere, countries around the world are rushing towards large scale carbon capture usage and storage projects (CCUS). In this process, CO2 is captured from sources, such as energy production and manufacturing, or directly removed from the air, and reused or stored permanently – for example, underground in disused oil and gas reservoirs or other suitable geological formations.

CCUS transport overview graphic

Source: CCS Image Library, Global CCS Institute [Click to view/download]

The International Energy Agency estimates that 100 billion tonnes of CO2 must be stored by 2060 to limit temperature rise to 2 degrees Celsius. Yet the Global CCS Institute reports that, as of 2019, the projects currently in operation or under construction had the capacity to capture and store only 40 million tonnes of CO2 per year.

It’s clear the global capacity for CCUS must accelerate rapidly in the coming decade, but it raises the questions: where can these millions of tonnes of CO2 be stored, and what happens to it once it is?

Where can you store CO2?

The most well-developed approach to storing CO2 is injecting it underground into naturally occurring, porous rock formations such as former natural gas or oil reservoirs, coal beds that can’t be mined, or saline aquifers. These are deep geological formations with deposits of very salty water present in the rock’s pores and most commonly found under the ocean. The North Sea and the area off the US Gulf Coast contain several saline aquifers.

Once CO2 has been captured using CCUS technology, it’s pressurised and turned into a liquid-like form known as ‘supercritical CO2’. From there it’s transported via pipeline and injected into the rocks found in the formations deep below the earth’s surface. This is a process called geological sequestration.

CCUS storage overview graphic

Source: CCS Image Library, Global CCS Institute [Click to view/download]

But while pumping CO2 into the ground is one thing, ensuring it stays there and isn’t released into the atmosphere is another. Fortunately, there are several ways to ensure CO2 is stored safely and securely.

Keeping the lid on CO2 stored underground

Put simply, the most straightforward way underground reservoirs store CO2 is through the solid impermeable rock that typically surrounds them. Once CO2 is injected into a reservoir, it slowly moves upwards through the reservoir until it meets this layer of impermeable rock, which acts like a lid the CO2 cannot pass through. This is what’s referred to as ‘structural storage’ and is the same mechanism that has kept oil and gas locked underground for millions of years.

White chalk stone

White chalk stone

Over time, the CO2 trapped in reservoirs will often begin to chemically react with the minerals of the surrounding rock. The elements bind to create solid, chalky minerals, essentially locking the CO2 into the rock in a process called ‘mineral storage’.

In the case of saline aquifers, as well as structural and mineral storage, the CO2 can dissolve into the salty water in a process called ‘dissolution storage’. Here, the dissolved CO2 slowly descends to the bottom of the aquifer.

In any given reservoir, each (or all) of these processes work to store CO2 indefinitely. And while there remains some possibility of CO2 leakage from a site, research suggests it will be minimal. One study, published in the journal Nature, suggests more than 98% of injected CO2 will remain stored for over 10,000 years.

Storage for the net zero future

In the United States, industrial scale storage is in action in Texas, Wyoming, Oklahoma and Illinois, and there are projects in progress across the United Arab Emirates, Australia, Algeria and Canada. However, there is still a long way to go for CCUS to reach the scale it needed to limit the effects of climate change.

Research has shown that globally, there is an abundance of CO2 storage sites, which could support widespread CCUS adoption. A report compiled by researchers at Imperial College London and E4tech and published by Drax details an estimated 70 billion tonnes of storage capacity in the UK alone. The US, on the other hand, has an estimated storage capacity of 10 trillion tonnes.

It’s clear the capacity for storage is present, it now remains the task of governments and companies to ramp up CCUS projects to begin to reach the scale necessary.  

In the UK, Drax Power Station is piloting bioenergy carbon capture and storage projects (BECCS), which could see it becoming the world’s first negative emissions power station. As part of the Zero Carbon Humber partnership, it could also form a part of the world’s first zero carbon industrial hub in the north of the UK.

Such projects are indicative of the big ambitions CCUS technology could realise – not just decarbonising single sites, but capturing and storing CO2 from entire industries and regions. There is still a way to go to meet that ambition, but it is clear the resources and knowledge necessary to get there are ready to be utilised.

Zero Carbon Humber

Source: Zero Carbon Humber [Click to view/download]

Learn more about carbon capture, usage and storage in our series:

From steel to soil – how industries are capturing carbon

11 March 2020

Carbon capture
Construction metallic bars in a row

Carbon capture, use and storage (CCUS) is a vital technology in the energy industry, with facilities already in place all over the world aiming to eliminate carbon dioxide (CO2) emissions.

However, for decarbonisation to go far enough to keep global warming below 2oC – as per the Paris Climate Agreement – emission reductions are needed throughout the global economy.

From cement factories to farmland, CCUS technology is beginning to be deployed in a wide variety of sectors around the world.

Construction

The global population is increasingly urban and by 2050 it’s estimated 68% of all people will live in cities. For cities to grow sustainably, it’s crucial the environmental impact of the construction industry is reduced.

Construction currently accounts for 11% of all global carbon emissions. This includes emissions from the actual construction work, such as from vehicle exhaust pipes, but a more difficult challenge is reducing embedded emissions from the production of construction materials.

Steel and concrete are emissions-heavy to make; they require intense heat and use processes that produce further emissions. Deploying widespread CCUS in the production of these two materials holds the key to drastically reducing carbon emissions from the built environment.

Steel manufacturing alone, regardless of the electricity used to power production, is responsible for about 7% of global emissions. Projects aimed at reducing the levels of carbon released in production are planned in Europe and are already in motion in the United Arab Emirates.

Abu Dhabi National Oil Company and Masdar, a renewable energy and sustainability company, formed a joint venture in 2013 with the aim of developing commercial-scale CCUS projects.

In its project with Emirates Steel, which began in 2016, about 800,000 tonnes of CO2 is captured a year from the steel manufacturing plant. This is sequestered and used in enhanced oil recovery (EOR). The commercially self-sustaining nature of this project has led to investigation into multiple future industrial-scale projects in the region.

Cement manufacturing, a process that produces as much as 8% of global greenhouse gases, is also experiencing the growth of innovative CCUS projects.

Pouring ready-mixed concrete after placing steel reinforcement to make the road by mixing in construction site

Norcem Cement plant in Brevik, Norway has already begun experimenting with CCUS, calculating that it could capture 400,000 tonnes of CO2 per year and store it under the North Sea. If the project wins government approval, Norcem could commence operations as soon as 2023.

However, as well as reducing emissions from traditional cement manufacturing and the electricity sources that power it, a team at Massachusetts Institute of Technology is exploring a new method of cement production that is more CCUS friendly.

By pre-treating the limestone used in cement creation with an electrochemical process, the CO2 produced is released in a pure, concentrated stream that can be more easily captured and sequestered underground or harnessed for products, such as fizzy drinks.

Agriculture

It’s hard to overstate the importance of the agriculture industry. As well as feeding the world, it employs a third of it.

Within this sector, fertiliser plays an essential role in maintaining the global food supply. However, the fertiliser production industry represents approximately 2% of global CO2 emissions.

CCUS technology can reduce the CO2 contributions made by the manufacturing of fertiliser, while maintaining crop reliability. In 2019, Oil and Gas Climate Initiative’s (OGCI) Climate Investments announced funding for what is expected to be the biggest CCUS project in the US.

Tractor with pesticide fungicide insecticide sprayer on farm land top view Spraying with pesticides and herbicides crops

Based at the Wabash Valley Resources fertiliser plant in Indiana, the project will capture between 1.3 and 1.6 million tonnes of CO2 from the ammonia producer per year. The captured carbon will then be stored 2,000 metres below ground in a saline aquifer.

Similarly, since the turn of the millennium Mitsubishi Heavy Industries Engineering has deployed CCUS technology at fertiliser plants around Asia. CO2 is captured from natural gas pre-combustion, and used to create the urea fertiliser.

However, the agriculture industry can also capture carbon in more nature-based and cheaper ways.

Soil acts as a carbon sink, capturing and locking in the carbon from plants and grasses that die and decay into it. However, intensive ploughing can damage the soil’s ability to retain CO2.

It only takes slight adjustments in farming techniques, like minimising soil disturbance, or crop and grazing rotations, to enable soil and grasslands to sequester greater levels of CO2 and even make farms carbon negative.

Transport

The transport sector is the fastest growing contributor to climate emissions, according to the World Health Organisation. Electric vehicles and hydrogen fuels are expected to serve as the driving force for much of the sector’s decarbonisation, however, at present these technologies are only really making an impact on roads. There are other essential modes of transport where CCUS has a role to play. 

Climeworks, a Swiss company developing units that capture CO2 directly from the air, has begun working with Rotterdam The Hague Airport to develop a direct air capture (DAC) unit on the airport’s grounds.

Climeworks Plant technology [Source: Climeworks Photo by Julia Dunlop]

hydrogen filling station in the Hamburg harbor city

Hydrogen filling station in Hamburg, Germany.

However, beyond just capturing CO2 from planes taking off, Climeworks aims to use the CO2 to produce a synthetic jet fuel – creating a cycle of carbon reusage that ensures none is emitted into the atmosphere. A pilot project aims to create 1,000 litres of the fuel per day in 2021.

Another approach to zero-carbon transport fuel is the utilisation of hydrogen, which is already powering cars, trains, buses and even spacecraft.

Hydrogen can be produced in a number of ways, but it’s predominantly created from natural gas, through a process in which CO2 is a by-product. CCUS can play an important role here in capturing the CO2 and storing it, preventing it entering the atmosphere.

The hydrogen-powered vehicles then only emit water vapour and heat.

From every industry to every business to everyone

As CCUS technology continues to be deployed at scale and made increasingly affordable, it has the potential to go beyond just large industrial sites, to entire economic regions.

Global Thermostat is developing DAC technology which can be fitted to any factory or plant that produces heat in its processes. The system uses the waste heat to power a DAC unit, either from a particular source or from the surrounding atmosphere. Such technologies along with those already in action like bioenergy with carbon capture and storage (BECCS), can quickly make negative emissions a reality at scale.

However, to capture, transport and permanently store CO2 at the scale needed to reach net zero, collaboration partnerships and shared infrastructure between businesses in industrial regions is essential.

The UK’s Humber region is an example of an industrial cluster where a large number of high-carbon industrial sites sit in close proximity to one another. By installing BECCS and CCUS infrastructure that can be utilised by multiple industries, the UK can have a far greater impact on emissions levels than through individual, small-scale CCUS projects.

Decarbonising the UK and the world will not be achieved by individual sites and industries but by collective action that transcends sectors, regions and supply chains. Implementing CCUS at as large a scale as possible takes a greater stride towards bringing the wider economy and society to net zero.

Learn more about carbon capture, usage and storage in our series:

5 projects proving carbon capture is a reality

4 March 2020

Carbon capture
Petra Nova Power Station

The concept of capturing carbon dioxide (CO2) from power station, refinery and factory exhausts has long been hailed as crucial in mitigating the climate crisis and getting the UK and the rest of the world to net zero. After a number of false starts and policy hurdles, the technology is now growing with more momentum than ever. Carbon capture, use and storage (CCUS) is finally coming of age.

Increasing innovation and investment in the space is enabling the development of CCUS schemes at scale. Today, there are over 19 large-scale CCUS facilities in operation worldwide, while a further 32 in development as confidence in government policies and investment frameworks improves.

Once CO2 is captured it can be stored underground in empty oil and gas reservoirs and naturally occurring saline aquifers, in a process known as sequestration. It has also long been used in enhanced oil recovery (EOR), a process where captured CO2 is injected into oil reservoirs to increase oil production.

Drax Power Station is already trialling Europe’s first bioenergy carbon capture and storage (BECCS) project. This combination of sustainable biomass with carbon capture technology could remove and capture more than 16 million tonnes of CO2 a year and put Drax Power Station at the centre of wider decarbonisation efforts across the region as part of Zero Carbon Humber.

Here are five other projects making carbon capture a reality today:

Snøhvit & Sleipner Vest 

Who: Sleipner – Equinor Energy, Var Energi, LOTOS, KUFPEC; Snøhvit – Equinor Energy, Petoro, Total, Neptune Energy, Wintershall Dean

Where: Norway

Sleipner Vest Norway

Sleipner Vest offshore carbon capture and storage (CCS) plant, Norway [Click to view/download]

Sleipner Vest was the world’s first ever offshore carbon capture and storage (CCS) plant, and has been active since 1996. The facility separates CO2 from natural gas extracted from the Sleipner field, as well as from at the Utgard field, about 20km away. This method of carbon capture means CO2 is removed before the natural gas is combusted, allowing it to be used as an energy source with lower carbon emissions.

Snøhvit, located offshore in Norway’s northern Barents Sea, operates similarly but here natural gas is pumped to an onshore facility for carbon removal. The separated and compressed CO2 from both facilities is then stored, or sequestered, in empty reservoirs under the sea.

The two projects demonstrate the safety and reality of long-term CO2 sequestration – as of 2019, Sleipner has captured and stored over 23 million tonnes of CO2 while Snøhvit stores 700,000 tonnes of CO2 per year.

Petra Nova

Who: NRG, Mitsubishi Heavy Industries America, Inc. (MHIA) and JX Nippon, a joint venture with Hilcorp Energy 

Where: Texas, USA

In 2016, the largest carbon capture facility in the world began operation at the Petra Nova coal-fired power plant.

Using a solvent developed by Mitsubishi and Kansai Electric Power, called KS-1, the CO2 is absorbed and compressed from the exhausts of the plant after the coal has been combusted. The captured CO2 is then transported and used for EOR 80 miles away on the West Ranch oil field.

Carbon capture facility at the Petra Nova coal-fired power plant, Texas, USA

As of January 2020, over 3.5 million tonnes of CO2 had been captured, reducing the plant’s carbon emissions by 90%. Oil production, on the other hand, increased by 1,300% to 4,000 barrels a day. As well as preventing CO2 from being released into the atmosphere, CCUS has also aided the site’s sustainability by eliminating the need for hydraulic drilling.


Gorgon LNG, Barrow Island, Australia [Click to view/download]

Gorgon LNG

Who: Operated by Chevron, in a joint venture with Shell, Exxon Mobil, Osaka Gas, Tokyo Gas, Jera

Where: Barrow Island, Australia

In 2019 CCS operations began at one of Australia’s largest liquified natural gas production facilities, located off the Western coast. Here, CO2 is removed from natural gas before the gas is cooled to -162oC, turning it into a liquid.

The removed CO2 is then injected via wells into the Dupuy Formation, a saline aquifer 2km underneath Barrow Island.

Once fully operational (estimated to be in 2020), the project aims to reduce the facility’s emissions by about 40% and plans to store between 3.4 and 4 million tonnes of CO2 each year.

Quest

Shell’s Quest carbon capture facility, Alberta, Canada

Who: Operated by Shell, owned by Chevron and Canadian Natural Resources

Where: Alberta, Canada

The Scotford Upgrader facility in Canada’s oil sands uses hydrogen to upgrade bitumen (a substance similar to asphalt) to make a synthetic crude oil.

In 2015, the Quest carbon capture facility was added to Scotford Upgrader to capture the CO2 created as a result of making the site’s hydrogen. Once captured, the CO2 is pressurised and turned into a liquid, which is piped and stored 60km away in the Basal Cambrian Sandstone saline aquifer.

Over its four years of crude oil production, four million tonnes of CO2 have been captured. It is estimated that, over its 25-year life span, this CCS technology could capture and store over 27 million tonnes of CO2.

Chevron estimates that if the facility were to be built today, it would cost 20-30% less, a sign of the falling cost of the technology.

Boundary Dam

Who: SaskPower

Where: Saskatchewan, Canada

Boundary Dam, a coal-fired power station, became the world’s first post-combustion CCS facility in 2014.

The technology uses Shell’s Cansolv solvent to remove CO2 from the exhaust of one of the power station’s 115 MW units. Part of the captured CO2 is used for EOR, while any unused CO2 is stored in the Deadwood Formation, a brine and sandstone reservoir, deep underground.

As of December 2019, more than three million tonnes of CO2 had been captured at Boundary Dam. The continuous improvement and optimisations made at the facility are proving CCS technology at scale and informing CCS projects around the world, including a possible retrofit project at SaskPower‘s 305 MW Shand Power Station.

Top image: Carbon capture facility at the Petra Nova coal-fired power plant, Texas, USA

Learn more about carbon capture, usage and storage in our series:

What is net zero?

21 January 2020

Carbon capture
Skyscraper vertical forest in Milan

For age-old rivals Glasgow and Edinburgh, the race to the top has taken a sharp turn downwards. Instead, they’re in a race to the bottom to earn the title of the first ‘net zero’ carbon city in the UK.

While they might be battling to be the first in the UK to reach net zero, they are far from the only cities with net zero in their sights. In the wake of the growing climate emergency, cities, companies and countries around the world have all announced their own ambitions for hitting ‘net zero’.

It has become a global focus based on necessity – for the world to hit the Paris Agreement targets and limit global temperature rise to under two degrees Celsius, it’s predicted the world must become net zero by 2070.

Yet despite its ubiquity, net zero is a term that’s not always fully understood. So, what does net zero actually mean?

Glasgow, Scotland. Host of COP26.

What does net zero mean?

‘Going net zero’ most often refers specifically to reaching net zero carbon emissions. But this doesn’t just mean cutting all emissions down to zero.

Instead, net zero describes a state where the greenhouse gas (GHG) emitted [*] and removed by a company, geographic area or facility is in balance.

In practice, this means that as well as making efforts to reduce its emissions, an entity must capture, absorb or offset an equal amount of carbon from the atmosphere to the amount it releases. The result is that the carbon it emits is the same as the amount it removes, so it does not increase carbon levels in the atmosphere. Its carbon contributions are effectively zero – or more specifically, net zero.

The Grantham Research Institute on Climate Change and the Environment likens the net zero target to running a bath – an ideal level of water can be achieved by either turning down the taps (the mechanism adding emissions) or draining some of the water from the bathtub (the thing removing of emissions from the atmosphere). If these two things are equally matched, the water level in the bath doesn’t change.

To reach net zero and drive a sustained effort to combat climate change, a similar overall balance between emissions produced and emissions removed from the atmosphere must be achieved.

But while the analogy of a bath might make it sound simple, actually reaching net zero at the scale necessary will take significant work across industries, countries and governments.

How to achieve net zero

The UK’s Committee on Climate Change (CCC) recommends that to reach net zero all industries must be widely decarbonised, heavy good vehicles must switch to low-carbon fuel sources, and a fifth of agricultural land must change to alternative uses that bolster emission reductions, such as biomass production.

However, given the nature of many of these industries (and others considered ‘hard-to-treat’, such as aviation and manufacturing), completely eliminating emissions is often difficult or even impossible. Instead, residual emissions must be counterbalanced by natural or engineered solutions.

Natural solutions can include afforestation (planting new forests) and reforestation (replanting trees in areas that were previous forestland), which use trees’ natural ability to absorb carbon from the atmosphere to offset emissions.

On the other hand, engineering solutions such as carbon capture usage and storage (CCUS) can capture and permanently store carbon from industry before it’s released into the atmosphere. It is estimated this technology can capture in excess of 90% of the carbon released by fossil fuels during power generation or industrial processes such as cement production.

Negative emissions essential to achieving net zero

Click to view/download graphic. Source: Zero Carbon Humber.

Bioenergy with carbon capture and storage (BECCS) could actually take this a step further and lead to a net removal of carbon emissions from the atmosphere, often referred to as negative emissions. BECCS combines the use of biomass as a fuel source with CCUS. When that biomass comes from trees grown in responsibly managed working forests that absorb carbon, it becomes a low carbon fuel. When this process is combined with CCUS and the carbon emissions are captured at point of the biomass’ use, the overall process removes more carbon than is released, creating ‘negative emissions’.

According to the Global CCS Institute, BECCS is quickly emerging as the best solution to decarbonise emission-heavy industries. A joint report by The Royal Academy of Engineering and Royal Society estimates that BECCS could help the UK to capture 50 million tonnes of carbon per year by 2050 – eliminating almost half of the emissions projected to remain in the economy.

The UK’s move to net zero

In June 2019, the UK became the first major global economy to pass a law to reduce all greenhouse gas emissions to net zero by 2050. It is one of a small group of countries, including France and Sweden, that have enacted this ambition into law, forcing the government to take action towards meeting net zero.

Electrical radiator

Although this is an ambitious target, the UK is making steady progress towards it. In 2018 the UK’s emissions were 44% below 1990 levels, while some of the most intensive industries are fast decarbonising – June 2019 saw the carbon content of electricity hit an all-time low, falling below 100 g/kWh for the first time. This is especially important as the shift to net zero will create a much greater demand for electricity as fossil fuel use in transport and home heating must be switched with power from the grid.

Hitting net zero will take more than just this consistent reduction in emissions, however. An increase in capture and removal technologies will also be required. On the whole, the CCC predict an estimated 75 to 175 million tonnes of carbon and equivalent emissions will need to be removed by CCUS solutions annually in 2050 to fully meet the UK’s net zero target.

This will need substantial financial backing. The CCC forecasts that, at present, a net zero target can be reached at an annual resource cost of up to 1-2% of GDP between now and 2050. However, there is still much debate about the role the global carbon markets need to play to facilitate a more cost-effective and efficient way for countries to work together through market mechanisms.

Industries across the UK are starting to take affirmative action to work towards the net zero target. In the energy sector, projects such as Drax Power Station’s carbon capture pilots are turning BECCS increasingly into a reality ready to be deployed at scale.

Along with these individual projects, reaching net zero also requires greater cooperation across the industrial sectors. The Zero Carbon Humber partnership between energy companies, industrial emitters and local organisations, for example, aims to deliver the UK’s first zero carbon industrial cluster in the Humber region by the mid-2020s.

Nonetheless, efforts from all sectors must be made to ensure that the UK stays on course to meet all its immediate and long-term emissions targets. And regardless of whether or not Edinburgh or Glasgow realise their net zero goals first, the competition demonstrates how important the idea of net zero has become and society’s drive for real change across the UK.

Drax has announced an ambition to become carbon negative by 2030 – removing more carbon from the atmosphere than produced in our operations, creating a negative carbon footprint. Track our progress at Towards Carbon Negative.

[*] In this article we’ve simplified our explanation of net zero. Carbon dioxide (CO2) is the most abundant greenhouse gas (GHG). It is also a long-lived GHG that creates warming that persists in the long term. Although the land and ocean absorb it, a significant proportion stays in the atmosphere for centuries or even millennia causing climate change. It is, therefore, the most important GHG to abate. Other long-lived GHGs include include nitrous oxide (N2O, lifetime of circa 120 years) and some F-Gasses (e.g. SF6 with a lifetime of circa 3,200 years). GHGs are often aggregated as carbon dioxide equivalent (abbreviated as CO2e or CO2eq) and it is this that net zero targets measure. In this article, ‘carbon’ is used for simplicity and as a proxy for ‘carbon dioxide’, ‘CO2‘, ‘GHGs’ or ‘CO2e’.

Climate change is the biggest challenge of our time

Will Gardiner, Chief Executive Officer, Drax Group

28 July 2019

Opinion
Drax Group CEO Will Gardiner

Climate change is the biggest challenge of our time and Drax has a crucial role in tackling it.

All countries around the world need to reduce carbon emissions while at the same time growing their economies. Creating enough clean, secure energy for industry, transport and people’s daily lives has never been more important.

Drax is at the heart of the UK energy system. Recently the UK government committed to delivering a net-zero carbon emissions by 2050 and Drax is equally committed to helping make that possible.

We’ve recently had some questions about what we’re doing and I’d like to set the record straight.

How is Drax helping the UK reach its climate goals?

At Drax we’re committed to a zero-carbon, lower-cost energy future.

And we’ve accelerated our efforts to help the UK get off coal by converting our power station to using sustainable biomass. And now we’re the largest decarbonisation project in Europe.

We’re exploring how Drax Power Station can become the anchor to enable revolutionary technologies to capture carbon in the North of England.

And we’re creating more energy stability, so that more wind and solar power can come onto the grid.

And finally, we’re helping our customers take control of their energy – so they can use it more efficiently and spend less.

Is Drax the largest carbon polluter in the UK?

No. Since 2012 we’ve reduced our CO2 emissions by 84%. In that time, we moved from being western Europe’s largest polluter to being the home of the largest decarbonisation project in Europe.

And we want to do more.

We’ve expanded our operations to include hydro power, storage and natural gas and we’ve continued to bring coal off the system.

By the mid 2020s, our ambition is to create a power station that both generates electricity and removes carbon from the atmosphere at the same time.

Does building gas power stations mean the UK will be tied into fossil fuels for decades to come?

Our energy system is changing rapidly as we move to use more wind and solar power.

At the same time, we need new technologies that can operate when the wind is not blowing and the sun is not shining.

A new, more efficient gas plant can fill that gap and help make it possible for the UK to come off coal before the government’s deadline of 2025.

Importantly, if we put new gas in place we need to make sure that there’s a route through for making that zero-carbon over time by being able to capture the CO2 or by converting those power plants into hydrogen.

Are forests destroyed when Drax uses biomass and is biomass power a major source of carbon emissions?

No.

Sustainable biomass from healthy managed forests is helping decarbonise the UK’s energy system as well as helping to promote healthy forest growth.

Biomass has been a critical element in the UK’s decarbonisation journey. Helping us get off coal much faster than anyone thought possible.

The biomass that we use comes from sustainably managed forests that supply industries like construction. We use residues, like sawdust and waste wood, that other parts of industry don’t use.

We support healthy forests and biodiversity. The biomass that we use is renewable because the forests are growing and continue to capture more carbon than we emit from the power station.

What’s exciting is that this technology enables us to do more. We are piloting carbon capture with bioenergy at the power station. Which could enable us to become the first carbon-negative power station in the world and also the anchor for new zero-carbon cluster across the Humber and the North.

How do you justify working at Drax?

I took this job because Drax has already done a tremendous amount to help fight climate change in the UK. But I also believe passionately that there is more that we can do.

I want to use all of our capabilities to continue fighting climate change.

I also want to make sure that we listen to what everyone else has to say to ensure that we continue to do the right thing.

What is a fuel cell and how will they help power the future?

27 June 2019

Carbon capture

How do you get a drink in space? That was one of the challenges for NASA in the 1960s and 70s when its Gemini and Apollo programmes were first preparing to take humans into space.

The answer, it turned out, surprisingly lay in the electricity source of the capsules’ control modules. Primitive by today’s standard, these panels were powered by what are known as fuel cells, which combined hydrogen and oxygen to generate electricity. The by-product of this reaction is heat but also water – pure enough for astronauts to drink.

Fuel cells offered NASA a much better option than the clunky batteries and inefficient solar arrays of the 1960s, and today they still remain on the forefront of energy technology, presenting the opportunity to clean up roads, power buildings and even help to reduce and carbon dioxide (CO2) emissions from power stations.

Power through reaction

At its most basic, a fuel cell is a device that uses a fuel source to generate electricity through a series of chemical reactions.

All fuel cells consist of three segments, two catalytic electrodes – a negatively charged anode on one side and a positively charged cathode on the other, and an electrolyte separating them. In a simple fuel cell, hydrogen, the most abundant element in the universe, is pumped to one electrode and oxygen to the other. Two different reactions then occur at the interfaces between the segments which generates electricity and water.

What allows this reaction to generate electricity is the electrolyte, which selectively transports charged particles from one electrode to the other. These charged molecules link the two reactions at the cathode and anode together and allow the overall reaction to occur. When the chemicals fed into the cell react at the electrodes, it creates an electrical current that can be harnessed as a power source.

Many different kinds of chemicals can be used in a fuel cell, such as natural gas or propane instead of hydrogen. A fuel cell is usually named based on the electrolyte used. Different electrolytes selectively transport different molecules across. The catalysts at either side are specialised to ensure that the correct reactions can occur at a fast enough rate.

For the Apollo missions, for example, NASA used alkaline fuel cells with potassium hydroxide electrolytes, but other types such as phosphoric acids, molten carbonates, or even solid ceramic electrolytes also exist.

The by-products to come out of a fuel cell all depend on what goes into it, however, their ability to generate electricity while creating few emissions, means they could have a key role to play in decarbonisation.

Fuel cells as a battery alternative

Fuel cells, like batteries, can store potential energy (in the form of chemicals), and then quickly produce an electrical current when needed. Their key difference, however, is that while batteries will eventually run out of power and need to be recharged, fuel cells will continue to function and produce electricity so long as there is fuel being fed in.

One of the most promising uses for fuel cells as an alternative to batteries is in electric vehicles.

Rachel Grima, a Research and Innovation Engineer at Drax, explains:

“Because it’s so light, hydrogen has a lot of potential when it comes to larger vehicles, like trucks and boats. Whereas battery-powered trucks are more difficult to design because they’re so heavy.”

These vehicles can pull in oxygen from the surrounding air to react with the stored hydrogen, producing only heat and water vapour as waste products. Which – coupled with an expanding network of hydrogen fuelling stations around the UK, Europe and US – makes them a transport fuel with a potentially big future.

 

Fuel cells, in conjunction with electrolysers, can also operate as large-scale storage option. Electrolysers operate in reverse to fuel cells, using excess electricity from the grid to produce hydrogen from water and storing it until it’s needed. When there is demand for electricity, the hydrogen is released and electricity generation begins in the fuel cell.

A project on the islands of Orkney is using the excess electricity generated by local, community-owned wind turbines to power a electrolyser and store hydrogen, that can be transported to fuel cells around the archipelago.

Fuel cells’ ability to take chemicals and generate electricity is also leading to experiments at Drax for one of the most important areas in energy today: carbon capture.

Turning CO2 to power

Drax is already piloting bioenergy carbon capture and storage technologies, but fuel cells offer the unique ability to capture and use carbon while also adding another form of electricity generation to Drax Power Station.

“We’re looking at using a molten carbonate fuel cell that operates on natural gas, oxygen and CO2,” says Grima. “It’s basic chemistry that we can exploit to do carbon capture.”

The molten carbonate, a 600 degrees Celsius liquid made up of either lithium potassium or lithiumsodium carbonate sits in a ceramic matrix and functions as the electrolyte in the fuel cell. Natural gas and steam enter on one side and pass through a reformer that converts them into hydrogen and CO2.

On the other side, flue gas – the emissions (including biogenic CO2) which normally enter the atmosphere from Drax’s biomass units – is captured and fed into the cell alongside air from the atmosphere. The CO2and oxygen (O2) pass over the electrode where they form carbonate (CO32-) which is transported across the electrolyte to then react with the hydrogen (H2), creating an electrical charge.

“It’s like combining an open cycle gas turbine (OCGT) with carbon capture,” says Grima. “It has the electrical efficiency of an OCGT. But the difference is it captures CO2 from our biomass units as well as its own CO2.”

Along with capturing and using CO2, the fuel cell also reduces nitrogen oxides (NOx) emissions from the flue gas, some of which are destroyed when the O2and CO2 react at the electrode.

From the side of the cell where flue gas enters a CO2-depleted gas is released. On the other side of the cell the by-products are water and CO2.

During a government-supported front end engineering and design (FEED) study starting this spring, this CO2 will also be captured, then fed through a pipeline running from Drax Power Station into the greenhouse of a nearby salad grower. Here it will act to accelerate the growth of tomatoes.

The partnership between Drax, FuelCell Energy, P3P Partners and the Department of Business, Energy and Industrial Strategy could provide an additional opportunity for the UK’s biggest renewable power generator to deploy bioenergy carbon capture usage and storage (BECCUS) at scale in the mid 2020s.

From powering space ships in the 70s to offering greenhouse-gas free transport, fuel cells continue to advance. As low-carbon electricity sources become more important they’re set to play a bigger role yet.

Learn more about carbon capture, usage and storage in our series: