低碳燃料：实现净零排放的最后一公里_42页_13mb

Summary of "Low-carbon fuels: The last mile to net-zero"

Core Content

This document explores the role of synthetic fuels in achieving net-zero emissions for the aviation and maritime shipping sectors, which are considered "hard-to-abate" due to their reliance on high-energy-density fuels and global operations. It emphasizes the need for low-carbon fuel solutions to complement electrification and hydrogen, as these sectors cannot easily transition to electric or hydrogen-based power.

Main Points

• Net-zero requires significant low-carbon fuel deployment: Achieving net-zero by 2050 necessitates a shift from fossil fuels to low-carbon fuels, particularly in sectors like aviation and shipping. These sectors are expected to account for about 6% of global CO₂ emissions, with aviation responsible for ~1 GtCO₂/year and shipping for ~1 GtCO₂/year.

• Biofuels and synthetic fuels are key alternatives: Biofuels, such as biodiesel, biokerosene, and bioethanol, can be used as drop-in replacements in existing infrastructure, but their limited availability and competition with food and agriculture use restrict their scalability. Synthetic fuels—such as ammonia, methanol, and synthetic kerosene—are seen as more viable long-term solutions.

• Synthetic fuels have high potential but face challenges: While synthetic fuels can be produced from low-carbon hydrogen and CO₂, they are still in early stages of deployment. Their production is limited by technological barriers, high costs, and the need for large-scale CO₂ capture and clean electricity. They are expected to supply 16 EJ of energy by 2050, which is a large portion of the total demand.

• Regulatory and economic support is essential: A globally harmonized regulatory framework is needed to support the development and adoption of synthetic fuels. Public support is crucial to reduce costs and enable widespread use, as synthetic fuels are currently two to ten times more expensive than fossil fuels.

• Technological and infrastructural challenges: The transition to synthetic fuels involves not only fuel production but also the development of new bunkering, refueling, and engine technologies. For example, ammonia and methanol require new infrastructure and engine modifications, unlike biofuels which are more compatible with current systems.

• Efficiency improvements can help but are not sufficient: Efficiency gains in aircraft and ships, including technological advances and operational measures, can reduce emissions but will not eliminate them entirely. These measures are expected to reduce emissions by up to 2% per year by 2050, but without fuel decarbonization, emissions will continue to rise.

• Synthetic fuels will dominate future fuel mix: In Deloitte's outlook, synthetic fuels are projected to supply 70% of aviation fuel and 95% of shipping fuel by 2050, with biofuels playing a smaller but still important role. The aviation sector is expected to achieve a 75% reduction in emissions by 2050, while shipping is projected to reach almost net-zero emissions.

Key Information

• Fuel consumption and emissions trends:

  • Aviation fuel consumption is expected to decrease by 18% by 2035 and 39% by 2050 compared to 2022 levels.
  • Shipping emissions are projected to decrease by 95% by 2050, with almost net-zero emissions achieved.
  • In 2050, synthetic fuels will account for 16 EJ of energy supply, compared to 26 EJ in total.

• Technological and infrastructural needs:

  • Hydrogen production and CO₂ capture are critical for synthetic fuel supply, requiring up to 10,000 TWh of clean electricity by 2050.
  • Fuel synthesis involves processes like the Haber-Bosch reaction (for ammonia) and Fischer-Tropsch (for synthetic kerosene).
  • Efficiency improvements are expected to be 1.6% per year from 2022 to 2035 and 2% per year from 2035 to 2050.

• Economic and regulatory challenges:

  • Synthetic fuels are currently more expensive than fossil fuels due to limited CO₂ feedstock availability and inefficiencies in production.
  • Investment is estimated to reach around $130 billion annually by 2050 to support synthetic fuel development.
  • A coordinated global regulatory framework is essential to avoid carbon leakage and arbitrage, and to support the development of synthetic fuels.

• Supply chain and market dynamics:

  • Global trade plays a key role in connecting low-cost feedstock sources with demand centers, helping to balance supply and demand and improve economic efficiency.
  • Biofuels are limited in availability due to competition with food production and land use constraints, which restricts their potential to 16 EJ by 2050, accounting for only 20% of transport fuel demand.

Conclusion

The transition to low-carbon fuels in aviation and shipping is essential for achieving global net-zero emissions by 2050. While biofuels offer a short-term solution, synthetic fuels will dominate the long-term energy mix. This transition requires coordinated efforts from policymakers, international organizations, fuel suppliers, manufacturers, and transport companies. Deloitte's outlook highlights the need for investment, regulatory alignment, and infrastructure development to make synthetic fuels a viable and cost-effective option for decarbonizing transport. The role of global trade in connecting supply and demand is also emphasized as a key enabler of this transition.