Dr Liu said the UN agency could play a central role in bringing states, manufacturers, airlines, airports and stakeholders together in the post-Covid transition towards a decarbonised future.

“A global policy under ICAO is crucial because this is the only way to ensure the success of this global transition that needs to take place, while leaving no country behind and avoiding distortion of competition,” she told the session, ‘Building a Path to Net-Zero Aviation’, moderated by LanzaTech CEO Jennifer Holmgren.

“The disruptions to the way of life of billions around the world will bring fundamental and widespread changes to who aviation serves, and how, once the pandemic is behind us. The aviation sector will need to rapidly adapt, to access green funding for investments in technology, operations and fuels, in order to meet the growing calls for a sustainable flying future.”

She said individuals too will play an increasingly important role in sustainability, choosing to fly with airlines and on aircraft with lower emissions.

Added the UK government’s Grant Shapps: “Absolutely fundamental to our ‘build back better’ plan is to decarbonise aviation, making planes cleaner and greener so the sector can grow in a sustainable and resilient way. It’s a process that started well before coronavirus but I consider it to be more important than ever that as we come out of it, we pursue it even more actively. Our single overriding goal is to make net-zero a possibility in aviation and to do so well before 2050.”

He said governments working alone could not tackle the issue and close collaboration with industry and also at a global level was needed, pointing to the setting up in the UK of the Jet Zero Council and the UK working through ICAO to set global net-zero, long-term goals and standards for aviation emissions.

“We want to use COP26 to help accelerate the transition to cleaner aviation,” he said. “We’re going to be working with the World Economic Forum (WEF) and other states to develop new policy tools that will help the deployment of SAF. For the summit itself, we’re seeking to arrange the provision of SAF for delegates’ flights at key UK airports and we’re going to encourage other countries across the world to do the same.

“The world is coming together around this policy discussion but only the power of government as a convener can bring it altogether and ‘grease the wheels’ to accelerate the process.”

Grazia Vittadini of Airbus said multilateralism and cross-industry unity was the common denominator in stimulating a sustainable and long-term recovery of the sector. “We clearly have the right level of ambition and science-driven targets,” she said. “Now we need to progress on the regulatory framework of policy support as well as robust and safe technology pathways to get us there.”

Schiphol’s Dick Benschop said that up until now there had been a scatter-gun approach to aviation sustainability policy that had been ineffective.

“We need to focus on three areas: carbon pricing schemes that encourage the right incentives, tackling the issue of SAF mandates and how to support R&D into new propulsion areas such as electric and hydrogen. Ticket taxes aren’t helpful as they add cost but don’t drive sustainability. Sustainability will have its costs but enormous benefits as well and we need policies that drive investments.”

He said there was cause for optimism, with policies taking shape in Europe such as the ReFuelEU Aviation initiative that he expected will introduce a SAF blending mandate. “This would be an enormous step forward,” he believes.

Other positive developments he saw included a coming together by the sector towards a commitment to net-zero aviation in 2050 in line with the Paris Agreement and the big oil companies making serious investment decisions on sustainable fuels.

Vittadini saw similar signs of optimism and said it was a false choice as to whether the aviation sector should first focus on recovering profitability post-Covid or remain committed to net-zero.

“At Airbus, we have accelerated our carbon-neutral ambition into a tangible plan to bring a zero-emission aircraft to market by 2035, which is the most direct contribution we can bring as a manufacturer,” she said.

“The pandemic has increased global understanding of how dependent we are on our environment. It’s become quite clear that any industry recovery and profit in the years to come will depend on ambitious climate protection plans in parallel.

“Another key implication for the industry, especially in Europe, is finding a balanced way forward for alternative fuel propulsion solutions and I see three priorities.”

First, she said, was the need to boost production and uptake of SAF through dedicated policy measures. “More specifically, I believe this policy should include prioritisation of sustainable fuels for aviation, investing in high-impact feedstock and conversion technologies, and cost-effective financing. SAF provides a short and long term solution to decarbonising the sector, while technology in parallel continues to evolve to achieve even more fuel-efficient aircraft than today.”

Another step would be to implement a “green stimulus” for airlines to enable them to retire old and less environmentally-friendly aircraft, she said.

“Replacing a single aircraft can save more than 4,500 tonnes of CO2 per year, with the saving rising to 37,000 tonnes if you consider long-range aircraft. Creating the right conditions, the right financing framework to allow airlines to modernise their fleet towards more fuel-efficient aircraft is a win-win and would help support the European green agenda.

“Lastly, we need to catalyse an industry collaboration like we have never seen before in recent history, joining forces with all stakeholders across the industry, the political arena and research institutions. It’s important to note that as with every new technology and innovation rollout, the global transition to zero-emission flight requires a total rethink of many elements of our intricate aviation ecosystem.

“Hydrogen will need a technical redesign of current aircraft. Engineers will need to take the technologies developed in automotive and space to bring the weight and the cost down, and making the technology safe and compatible with commercial aircraft operations. We’re going to need to mobilise changes to airport infrastructure and we’ve started working with several airports, including Schiphol, on the concept of an airport hydrogen hub. Of course, we’re going to need the cooperation of aviation authorities to certify future hydrogen-powered aircraft to airworthiness safety standards, not to mention government collaboration as a critical piece of the puzzle. We do welcome the R&D funding support we are receiving from the EU and countries including France, Germany, Spain and the UK.”

Established in 2019, the Clean Skies for Tomorrow (CST) coalition brings together around 80 aviation and fuel industry companies and other stakeholders, including international organisations and associations, think tanks, NGOs and academia, to facilitate the transition to net-zero flying by mid-century.

In their foreword to the ‘Sustainable Aviation Fuels as a Pathway to Net-Zero Aviation’ report, Christoph Wolff, Head, Shaping the Future of Mobility, at WEF and Daniel Riefer, Platform Fellow WEF and Associate Partner at McKinsey, said that with electric flight and hydrogen-powered propulsion still years away from application at scale, SAF is a necessary step in aviation’s decarbonisation pathway.

“The CST coalition is working to address the chicken-and-egg scenario whereby producers and consumers of SAF are both either unwilling or unable to carry the initial cost burden of investing in new technologies to reach a scale where they are more cost competitive with existing fossil fuel-derived options,” they write. “The aim is to break this impasse and advance the commercial scale of viable production of sustainable low-carbon aviation fuels (bio and synthetic) for broad adoption in the industry by 2030. This report, developed in close consultation with the CST coalition, serves to provide a fact base on which swift and bold actions should be taken by public and private sector leaders alike.”

In 2019, says the report, fewer than 200,000 tonnes of SAF were produced globally, amounting to less than 0.1% of the roughly 300 million tonnes of jet fuel used by commercial airlines. If all SAF projects that have been publicly announced are completed, capacity will scale to at least 4 million tonnes in the next few years, reaching volumes just over 1% of expected global jet fuel demand in 2030. However, it says, a transition to SAF is in reach and from a feedstock perspective, enough raw material is available to fuel all aviation by 2030.

To scale production and make SAF economically viable and scale production, the authors say several advances will be required: technological challenges must be overcome; a supportive regulatory framework needs to be installed to stimulate demand from corporate and private customers; and innovative solutions to finance the transition have to be implemented. “The CST coalition is debating how to meet these challenges and help aviation earn its right to keep growing,” says the report.

It concludes: “Producing sustainable aviation fuel will almost certainly continue to be more expensive than refining fossil jet fuel but the costs of exceeding the 1.5 or 2.0-degree targets of the Paris Agreement are incalculably greater.”

Top photo and video: World Economic Forum

ZeroAvia’s September flight of a six-seat Piper Malibu M350 utilised a smaller version of the hydrogen fuel cell powertrain it developed for the first HyFlyer project, which was also supported with a grant from the government-industry ATI programme. HyFlyer II is aimed at bringing to market the first hydrogen-electric powertrain suitable for commercial aircraft by 2023. Typically, up to 19-seat aircraft, such as the Cessna 208 Caravan and the Viking Air DHC-6 Twin Otter, are used in regional aviation and cargo transport worldwide. ZeroAvia says it 600kW hydrogen-electric powertrain is platform-agnostic and will have lower operating costs and less air pollution than its jet-fuelled competition.

It is planning to perform initial test flights in 2021 and culminate in a 350-mile demonstration flight. By 2027, it expects to have powerplants in service capable of powering commercial flights of over 500 miles in aircraft with up to 100 seats and by 2030 more than 1,000 miles in aircraft with over 100 seats.

For the HyFlyer II project, ZeroAvia is working again with the European Marine Energy Centre (EMEC) to deliver the green hydrogen fuelling systems required to power the aircraft for flight tests, including through mobile fuelling platforms suited to airport environments. For the first time, it is partnering with Aeristech to utilise the company’s advanced air compressor system as part of the 19-seat powertrain.

The $21.4 million Series A funding was led by Breakthrough Energy Ventures and the Ecosystem Integrity Fund, with follow-on investors Amazon Climate Pledge Fund, Horizons Ventures, Shell Ventures and Summa Equity. Total funding since inception stands at $49.7 million.

“We see tremendous potential for hydrogen to decarbonise transportation, a core focus of our investment strategy,” said Devin Whatley, Managing Partner at the Ecosystem Integrity Fund. “With aviation being such a significant contributor to global greenhouse gas emissions, and also one of the trickiest areas to decarbonise, we believe ZeroAvia offers the only near-term solution to sustainable aviation and has already made significant progress toward achieving this goal.” 

Added Kara Hurst, Amazon’s VP Worldwide Sustainability: “Amazon created The Climate Pledge Fund to support the development of technologies and services that will enable Amazon and other companies to reach the goals of the Paris Agreement ten years early – achieving net zero carbon by 2040. ZeroAvia’s zero-emission aviation powertrain has real potential to help decarbonise the aviation sector, and we hope this investment will further accelerate the pace of innovation to enable zero-emission air transport at scale.”

The £12.3 million grant, which is being matched by funding from the project’s partners, is being made through the Department for Business Energy & Industrial Strategy (BEIS), Innovate UK and ATI.

“Next year, as the UK assumes the Chair of the G7 nations and hosts COP26, we have an exciting opportunity to lead through example on climate change as we power towards net zero with our new ambitious plan to put the UK at the forefront of the green industrial revolution and a green jobs boom,” said Energy Minister, Kwasi Kwarteng.

“ZeroAvia’s HyFlyer II project will bring yet another first for zero-emission flight to British skies, boosting our work through the Jet Zero Council, as well as positioning the country as a leader in green aviation technology and ensuring the UK builds back greener after the pandemic.”

Launched in June, the Jet Zero Council is an initiative between industry and government to focus on delivering net zero emissions commercial flight, whose members include ZeroAvia and British Airways.

IAG’s Hangar 51 accelerator programme works with start-ups and scale-ups from around the world to provide an opportunity to develop and test their products on “real world business challenges,” explains British Airways. On completion of the project, the airline says research and learnings from the process will be shared and the ZeroAvia and Hangar 51 teams will consider how the partnership will progress longer term.

“We are very excited to partner with ZeroAvia and get a glimpse of a zero-emissions future using hydrogen-powered aircraft,” said Louise Evans, British Airways’ Director of External Communications & Sustainability. “During the partnership, as well as assessing the environmental advantages of the technology, we will also be exploring the operational, commercial and customer experience improvements that can be achieved.”

Responded Sergey Kiselev, Head of Europe for ZeroAvia: “Our mission is to accelerate the world’s transition to truly zero emissions flight and we believe hydrogen is the best way to quickly and practically achieve this. Earlier this year, we proved that passengers will soon be able to board an emissions-free, hydrogen-powered aircraft for commercial services. In the years to come, we will scale that technology up to power larger aircraft over longer distances.

“We have found that in addition to improving the sustainability of flight, which is vital, hydrogen-electric technology has the potential to lower operating costs and improve the in-flight passenger experience. We are delighted to be working with British Airways, one of the world’s iconic airlines, and the Hangar 51 programme to explore how hydrogen-electric aircraft can power the fleet of the future. That promising future is closer than ever.”

British Airways CEO Sean Doyle said the airline was committed to achieving net zero carbon emissions by 2050. “In the short term this means improving our operational efficiency and introducing carbon offset and removal projects, while in the medium to longer term we’re investing in the development of sustainable aviation fuel and looking at how we can help accelerate the growth of new technologies, such as zero emissions hydrogen-powered aircraft.”

Four years earlier than planned, BA has now retired the last of its Boeing 747 fleet, to be replaced by more fuel-efficient Boeing 787s and Airbus A350s. It is expecting sustainable aviation fuel supplies from the planned Velocys Altalto waste-to-jet fuel plant, in which it is co-partner with Shell, located in north-east England to start arriving in 2025. Slated to produce around 20 million gallons a year, the airline estimates this would be enough to power more than 1,000 flights from London to New York each year in an A350.

In 2019, parent company IAG became the first airline group worldwide to commit to achieving net zero carbon emissions by 2050 (see article).

IAG CEO Luis Gallego told the Climate Ambition Summit 2020, convened on December 12 by the United Nations, the UK and France ahead of next year’s COP26: “Despite the current crisis, we believe it is absolutely critical that our industry plays its full part in addressing climate change. Our actions show how seriously we are taking the commitment. We will not back down from our ambition and efforts to reduce aviation carbon emissions.”

Following its flight from Cranfield University’s airfield, ZeroAvia is now planning the next and final stage of its six-seat development programme with a 250-mile zero-emission flight out of an airfield in Orkney, Scotland before the end of this year.

The programme in the UK is part-funded through the UK government’s Aerospace Technology Institute, which is supporting the HyFlyer project that aims to decarbonise medium-range small passenger aircraft by demonstrating powertrain technology to replace conventional piston engine in propeller aircraft. As well as Protium, other partners in the project include the European Marine Energy Centre (EMEC) and Intelligent Energy. The latter is optimising its high-power fuel cell technology for application in aviation while EMEC, producers of green hydrogen from renewable energy, is supplying the hydrogen required for flight testing and developing a mobile refuelling platform compatible with the plane.

ZeroAvia has joined the UK’s Jet Zero Council, a government and industry partnership launched by British Prime Minister Boris Johnson this summer to drive net-zero ambitions for the UK aviation and aerospace sector. Along with government ministers, the Council is made up of representatives from the aviation industry, investor groups and an NGO, and will be chaired by the UK’s Transport Secretary and Business Secretary. The full list of Council members has now been published by the government.

The principal aims of the body are to:

• Develop and industrialise zero-emission aviation and aerospace technologies;
• Establish UK production facilities for sustainable aviation fuels (SAF) and commercialising the industry by driving down production costs; and
• Develop a coordinated approach to the policy and regulatory framework needed to deliver net zero aviation by 2050.

“Climate change is one of the greatest challenges faced by modern society, and we know we need to go further and faster if we are to make businesses sustainable long into the future,” said Aviation Minister Robert Courts. “That’s why we’re bringing together government, business and investors to reduce emissions in the aviation sector. Through innovative technologies such as sustainable fuels, hybrid and eventually electric planes, we will build a cleaner, greener and more sustainable future for all.”

Sustainable Aviation (SA), which committed in February to achieving net-zero emissions by 2050, believes a UK SAF industry could add £2.9 billion ($3.7bn) annually to the economy, create 20,000 jobs in SAF production and export services, and deliver savings of 3.6 million tonnes of CO2 a year by 2038. The industry group is calling for £500 million ($640m) in government funding, made up of £429 million in government-backed loan guarantees for the initial first-of-its-kind SAF production facilities, £50 million in grants and development support for new SAF technologies, and £21 million to establish a UK clearing house to enable SAF testing and approval.

The SA-commissioned research undertaken by energy consultancy E4tech showed 14 SAF production facilities could be built in seven industrial clusters situated in Teesside, Humberside, North West England, South Wales, Southampton, St Fergus and Grangemouth, Scotland. Humberside is the intended location for the Altalto waste-to-jet-fuel facility proposed by Velocys and backed by British Airways and Shell, which is expected to be the first in the UK to produce SAF.

“The research shows that it is possible to deliver on the government’s Jet Zero ambition and transform aviation using readily available feedstocks, innovative technology and existing aircraft,” commented Henrik Wareborn, CEO of Velocys. “With Altalto, the Humber could fuel this transformation, cutting carbon and creating jobs in the process. As a key cluster for the development of this new domestic industry, the region has a fantastic opportunity to establish itself as the global hub for fuelling future air travel.”

Added Adam Morton, Chair of Sustainable Aviation: “Sustainable aviation fuels will be essential for the global aviation industry in a net zero world and the UK has a golden opportunity to become a world-leader by commercialising this technology at an early stage.

“There are enormous benefits in terms of jobs and growth across these clusters. By backing SAF in this way, the government can kickstart a green recovery and create high-quality and futureproof jobs for thousands of people. All of this can be delivered at the same time as slashing carbon emissions.”

Speaking at a cross-party parliamentary debate he called to discuss the work of the Jet Zero Council, Andrew Selous MP said: “We should harness our huge strength in aviation technology and engineering to find new solutions to allow us to fly without wrecking the planet.

“We also need to ensure that the United Kingdom is at the forefront of sustainable aviation, so that the high-skilled, high-wage jobs of the future are provided here. We cannot leave this to chance, as has unfortunately happened with other technologies in the past.”

Responded Aviation Minister Robert Courts: “Britain has always led the way on aviation, and we will continue to do so. There is a huge prize in sight: developing the sector that meets the challenges of the future, and we will be front and centre, capturing those first mover advantages.”

Commenting after the debate, Morton said: “The support from a broad range of MPs from right across the political landscape is testament to this crucial issue. It’s so important to see this coalition come together to back early stage sustainable aviation fuel facilities.”

The next meeting of the Jet Zero Council is due to take place at the end of this month, which Sustainable Aviation said would be an opportunity for government and industry to discuss and make progress on accelerating the development of early-stage SAF facilities.

The only environmental group represented on the Council is the Aviation Environment Federation. Its Director, Tim Johnson, said: “Some government support and incentive for sustainable aviation fuel R&D is reasonable, and happens already, but that helps to accelerate bringing a product to market. But once at market, the question is scaling up and getting it into the fleet. The quid pro quo must therefore be that industry accepts it can’t rely on voluntary approaches and market forces, which hasn’t really worked to date for SAF because it doesn’t create certainty for investors – and that governments must regulate and introduce effective carbon pricing that ensures uptake.”

Photo: ZeroAvia’s Piper M-class retrofitted aircraft undertakes first hydrogen flight

“Rolls-Royce is committed to playing a leading role in reaching net zero carbon by 2050,” said Rob Watson, Director – Rolls-Royce Electrical. “The completion of ground testing for the ACCEL project is a great achievement for the team and is another important step towards a world record attempt. This project is also helping to develop Rolls-Royce’s capabilities and ensure that we remain a leader in delivering the electrification of flight, an important part of our sustainability strategy.”

The testing involved running the propeller up to full speed of approximately 2,400 rpm using what Rolls-Royce claims is the most power-dense battery pack ever assembled for aircraft propulsion. Over 6,000 cells are packaged in the battery for maximum safety, minimum weight and full thermal protection, it said.  Other companies involved in the project are YASA, a manufacturer of axial-flux electric motors and controllers for automotive and aerospace applications, and Electroflight, a technology and engineering services business that supplies bespoke battery systems for the aerospace sector.

The first flight is planned for later this year, with an attempt on beating the current all-electric flight world speed record expected to follow next year. The project is also the first at Rolls-Royce to use offsetting to make the whole programme carbon neutral.

“The ACCEL team is pioneering the integration of high-performance batteries, motors and drives to deliver an electric propulsion system in an ambitious flight test programme. These technologies and the systems integration needed to utilise them hold great potential for future sustainable aviation, which is why the ATI is proud to support the project,” said the ATI’s Mark Scully, Head of Technology for Advanced Systems & Propulsion.

Added UK Business and Industry Minister Nadhim Zahawi: “The completion of ground testing for the government-backed ACCEL project is not only a step towards an exciting world record attempt, but a leap towards developing all-electric and hybrid-electric planes that one day could ferry large numbers of passengers around the world.”

Created by the ATI and Boeing, and run by leading European accelerator Ignite, Rolls-Royce is joining the accelerator programme’s second cohort, which has opened applications to invest into sustainability-enabling start-ups that will benefit the UK aerospace industry across three key areas of focus: Industry 4.0, Lifecycle and Resilience, and Energy. This includes innovative energy and energy storage solutions such as battery lifecycle optimisation, alternatives for rare earth materials, hydrogen management solutions and sustainable aviation fuels.

Selected companies may receive £100,000 ($128,000) equity investment from Boeing HorizonX Global Ventures, together with first-hand access to strategists and technical experts from the programme’s partners and corporate sponsor GKN Aerospace. In light of the new Rolls-Royce partnership, applications for cohort two have been extended and will close on October 4. The programme will be running two cohorts a year, with each cohort made up of 8-10 start-ups, and is open to companies domiciled outside the UK.

“Having worked alongside the ATI, Boeing and GKN Aerospace, we’ve seen how much start-ups appreciate the access to top-class resources that these companies offer and we are incredibly excited about the opportunities that our next cohort will receive through our partnership with Rolls-Royce,” said Gabi Matic, Programme Director at ATI Boeing Accelerator.   

In July, the ATI launched the government-backed FlyZero project with the aim of accelerating the adoption of more sustainable technology solutions and achieve zero-carbon commercial flight by the end of the decade. It plans to identify the zero-carbon technology solutions that could bring the largest impact to reducing overall aviation emissions in support of the UK government’s 2050 net-zero objective. An overview of the project was presented in a webinar held in August.

Photo: Rolls-Royce ACCEL

As part of Boeing’s 2020 ecoDemonstrator programme, a final test flight of an Etihad Airways 787-10 from Seattle to Boeing’s manufacturing site in South Carolina used 50,000 gallons of a 50/50 blend – the maximum blend permitted for commercial aviation – of sustainable and traditional jet fuel. The sustainable fuel, which has been used in lower blends on other test flights conducted during the programme, was produced from inedible agricultural wastes by World Energy and supplied by EPIC Fuels. Boeing and Etihad have had a longstanding collaboration on sustainable aviation fuels (SAF) and were founding partners on a pilot project taking place at Khalifa University near Abu Dhabi to produce jet fuel from saltwater-tolerant plants. Khalifa University has recently hosted a series of webinars focusing on SAF in the UAE.

Mohammad Al Bulooki, Etihad Aviation Group’s COO, said the ecoDemonstrator flight was a “monumental step forward for the sector to prove the viability of producing a 50/50 blend of SAF at a high volume.”

In January, Etihad took delivery of a 787-10 using a fuel mix comprising 30% SAF produced by World Energy. For more than a decade, World Energy and EPIC have produced and supplied SAF to Boeing for flight testing and the aircraft manufacturer offers airlines the option of using SAF for their delivery flights, the first of these being an Etihad 777-300ER in 2012.

“Sustainable aviation fuels are proven and work in airplanes flying today and those that will fly tomorrow, but there’s a very limited supply,” said Sheila Remes, Boeing’s VP Strategy. “World Energy is making commercial-scale volumes of sustainable fuel at competitive prices, leveraging government low-carbon incentives to accelerate production and use in an industry that relies on liquid fuels.”

Created in 2010, the Sustainable Bioenergy Research Consortium (SBRC) is piloting a unique desert ecosystem to produce SAF from plants that grow in the desert and are irrigated by coastal seawater. Etihad used the initial batch of fuel in January 2019 on a passenger flight from Abu Dhabi to Amsterdam.

The series of eight SAFI-UAE webinars (available for viewing here) hosted by Khalifa University and moderated by Dr Alejandro Rios, Director of SBRC, concludes on September 30 with a focus on establishing a SAF industry in the UAE through a work programme and stakeholder collaboration.

Boeing’s ecoDemonstrator programme takes promising technologies out of the lab and tests them in the air to accelerate innovation. This year’s programme evaluated four projects to reduce emissions and noise and enhance the safety and health of passengers and crew. It included a collaboration with Safran over the noise caused by airflow over the landing gear of aircraft. The partners have designed fairings around the landing gear to smooth out the turbulence to reduce noise levels by what Boeing describes as a significant amount.

Another project with NASA involved the investigation of how sound interacts with aircraft using special onboard acoustic sensors that detect small variations of sound while the aircraft is flying. The sound is then measured both on the aircraft and also on the ground using a thousand microphones in special patterns.

“This test is going to give us the best information on this aspect of aircraft noise that we’ve been able to achieve in flight,” said Russell Thomas, a senior research engineer at NASA Langley Research Center. “Out of that, we will be able to create what we think is a new avenue of noise reduction technologies and approaches. It really allows us to go one step further in developing new ideas and concepts for future aircraft that will be even quieter for the communities.”

Photo: Boeing