🚢 Shipping Energy Efficiency

Since 2008, the sector has made progress in improving energy efficiency through measures such as slow steaming and the use of larger vessels. However, there is still considerable potential for further reducing energy costs. Technologies that are already commercially available, such as improved hull design and waste heat recovery systems, could lead to significant reductions in fuel consumption and overall expenses.

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SPEAKER_01 0:01

Welcome back, everyone, for another deep dive here on the Deep Dive. Today, we're going to be focusing our attention on maritime shipping. Okay. Um, a subject that might not immediately come to mind when you think about climate change. Right. But as we'll explore with our featured article, article name by contributor name. It's absolutely central to the conversation. Think about this. The vast majority of everything you own has at some point traveled by sea.

unknown 0:28

Wow.

SPEAKER_01 0:28

That sheer scale makes maritime shipping the very backbone of international trade and integral to the global supply chains that bring goods to your doorstep.

SPEAKER_00 0:38

Absolutely. It's a It's foundational. Yeah. Yeah. It really is a truly foundational element. And to power this massive movement of goods, the industry consumes a significant amount of energy, around 5% of the world's total annual oil use, which translates to roughly 700 million tons of CO2 emissions each year. Wow. To give you a sense of scale. If maritime shipping were a country, its carbon emissions would rival those of a significant industrialized nation.

SPEAKER_01 1:04

So this is a big deal.

SPEAKER_00 1:06

It is a big deal.

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And this isn't a static picture. Since 2008, the value of goods traded internationally and the level of shipping activity has grown by about 50%. Wow. Naturally, this increase in activity has led to higher energy consumption, reaching 4.2 million barrels of oil per day in 2023.

SPEAKER_00 1:27

Okay.

SPEAKER_01 1:28

You might expect that more activity directly equals proportionally more fuel use. Right. Here's where it gets interesting. Okay. Despite this major increase in shipping, the amount of fuel needed to move a ton of goods, a single mile, what's called the energy intensity of shipping, how efficiently they're moving goods, has actually decreased by about 30% since 2008.

SPEAKER_00 1:47

Aaron Powell That's uh that's fascinating.

SPEAKER_01 1:49

It is.

SPEAKER_00 1:50

And the sheer magnitude of those efficiency gains is pretty impressive. In 2023 alone, that 30% reduction translated into saving 1.8 million barrels of oil every single day and a massive $60 billion USD in fuel costs.

SPEAKER_01 2:05

Yeah, that's real money.

SPEAKER_00 2:06

That's real money.

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So the mission for this part of our deep dive is to understand exactly how these significant energy efficiency gains were achieved. What were the main factors that drove this change? And perhaps even more importantly, what does the future potential look like? Okay. By digging into this now, we'll be much better equipped to discuss the climate change implications and potential solutions for maritime shipping down the line.

SPEAKER_00 2:29

Aaron Powell Absolutely.

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You can't really talk about where you're going without understanding where you've been.

SPEAKER_00 2:34

Aaron Powell Exactly. You can't really have a meaningful discussion about the future without understanding the journey so far, what's been tried, what has worked, and crucially why. So let's unpack these efficiency games and see what we can learn.

SPEAKER_01 2:48

Aaron Powell All right. So the article points to two primary drivers behind those impressive reductions in energy intensity.

SPEAKER_00 2:54

Okay.

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The first is something called slow steaming.

SPEAKER_00 2:57

Slow steaming.

SPEAKER_01 2:58

Which is exactly what it sounds like. Ships traveling at lower speeds. Now that sounds pretty straightforward, but the impact is huge.

SPEAKER_00 3:05

It is.

SPEAKER_01 3:06

Apparently, even a moderate reduction in a ship's speed can drastically cut its fuel consumption.

SPEAKER_00 3:11

Yeah, that's the crucial point. The relationship between a ship's speed and its fuel consumption isn't a simple one-to-one ratio. It's more like a curve. The faster you push a vessel through water, the greater the resistance becomes. And therefore, the more energy you need to burn to maintain that speed. So even a relatively small decrease in speed can lead to surprisingly large fuel savings. The article highlights that, on average, shipping speeds have decreased by about 10% since 2008. And that single change accounts for over one million barrels of oil saved per day globally. That's pretty impressive.

SPEAKER_01 3:50

That's a that's a lot. And the second major factor was simply the trend towards building bigger ships. It makes intuitive sense, doesn't it? Larger vessels can carry significantly more cargo without a proportionally massive increase in hull size and the resulting resistance in the water.

SPEAKER_00 4:06

Exactly. The contributor highlights that average ship sizes have grown by over 50% since 2008. This increase in the scale of operations has created significant efficiencies in terms of fuel burned per ton of goods transported, saving another 300,000 barrels of oil per day. When you combine the effects of slow steaming and larger vessels, these two factors alone explain the majority. Around two-thirds of that impressive 30% reduction in energy intensity we talked about earlier.

SPEAKER_01 4:35

So these weren't necessarily the result of some revolutionary technological breakthroughs, were they? It sounds more like a practical response to economic conditions. And some initial regulatory measures. The article mentions things like high fuel prices, shifts in market dynamics, and the introduction of energy efficiency standards for new ships, as well as regulations concerning the sulfur content in marine fuels.

SPEAKER_00 4:57

Right.

SPEAKER_01 4:57

These probably all played a role in shaping these efficiency gains.

SPEAKER_00 5:01

That's a very astute observation. These changes were largely driven by a combination of economic necessity and regulatory pressure. When fuel costs represent a huge chunk of your operating expenses, as they do in shipping, there's a strong financial incentive to find ways to consume less of it. Similarly, regulations establish a baseline for efficiency, pushing the entire industry in a more sustainable direction, even if those initial steps were incremental.

SPEAKER_01 5:29

Okay, so we've seen these significant improvements coming from slower speeds and the use of larger ships. But the article also suggests that there are limits to how much further we can rely on these strategies. Okay. Why is that? Well can't ships just travel at a snail's pace and become absolutely enormous?

SPEAKER_00 5:46

Well, that's where real world practicality comes into play. Ship sizes, as you rightly pointed out, aren't just a matter of engineering possibility. They're heavily influenced by global trade patterns and the infrastructure that supports them. Think about crucial waterways, like the Panama or Suez Canals. Yeah. Or even the physical limitations of port facilities around the world. There are very real constraints on how large a ship can be built, and crucially, where it can actually operate.

SPEAKER_01 6:12

Right, like trying to navigate a super tanker up a small river.

SPEAKER_00 6:16

Precisely.

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It's just not feasible.

SPEAKER_00 6:18

And while further reductions in sailing speed are technically possible, you start to encounter significant trade-offs related to revenue and overall shipping capacity. If a voyage takes considerably longer, you might need a larger fleet of ships to move the same volume of cargo, potentially negating some of the fuel savings achieved by slow steaming. There's also the increasing demand for just-in-time delivery systems in many industries, where speed and predictable transit times are absolutely critical.

SPEAKER_01 6:46

That makes sense. Time is money.

SPEAKER_00 6:48

Exactly.

SPEAKER_01 6:48

But the article does touch on a potential way to lessen the drawbacks of slower speeds.

SPEAKER_00 6:53

Okay.

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Minimizing the amount of time ships spend waiting in ports.

SPEAKER_00 6:56

Okay.

SPEAKER_01 6:57

How could optimizing port operations help improve efficiency?

SPEAKER_00 7:00

The underlying idea is to shift away from a model where ships sail as fast as possible to reach a port and then often sit idle, burning fuel while waiting for a berth. Instead, a just-in-time arrival system aims to coordinate ship arrival times with port availability. This would allow vessels to optimize their speed during the voyage, avoiding unnecessary high-speed travel, and the subsequent waiting period.

SPEAKER_01 7:26

So it's about smoothing out that process.

SPEAKER_00 7:28

Exactly. Achieving this requires much better communication, data sharing, and overall coordination across the entire global logistics chain. But the potential for significant efficiency gains is substantial.

SPEAKER_01 7:39

Okay, so it sounds like the low-hanging fruit of speed reduction and increasing ship size might be reaching its limits. Okay. But the article then shifts to a really interesting area. The underutilized potential of energy efficiency technologies that are already commercially available. Right. It suggests that we're not fully capitalizing on the solutions that already exist.

SPEAKER_00 7:58

Yeah, that's a crucial takeaway. When you examine the average improvement in design engine power efficiency, for new ships built over the last 15 years, the progress is surprisingly modest. Only around 4%.

SPEAKER_01 8:10

Okay.

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Furthermore, DNV, a leading maritime classification society, has found that many readily available energy efficiency technologies are installed on less than 5% of the global shipping fleet.

SPEAKER_01 8:24

So a lot of room for improvement. So what kinds of technologies are we talking about?

SPEAKER_00 8:33

There's a wide range of options.

SPEAKER_01 8:35

Okay.

SPEAKER_00 8:35

Some technologies like waste heat recovery systems have been around for about a decade. These systems capture the waste heat generated by the ship's main engines and use it to produce auxiliary power, reducing the need to burn additional fuel. Then you have more recent innovations such as hull optimization, designing the underwater shape of the ship to minimize drag, and air lubrication systems, which pump a layer of air bubbles under the hull to reduce friction as the ship moves through the water. These technologies have already been deployed on hundreds of vessels, and are demonstrating promising fuel savings in real-world conditions.

SPEAKER_01 9:11

So these are things that are already out there.

SPEAKER_00 9:13

Exactly. And looking further ahead, even more innovative solutions, like kite sales, are in the full-scale demonstration phase, harnessing wind power. To supplement the ship's engine power? Kite sails. It sounds a little bit like a step back in time, but with a very modern application.

SPEAKER_01 9:30

That's a really cool image.

SPEAKER_00 9:31

And the article makes a really compelling economic case. For some of these technologies, for instance, a combination of improved hull and propeller design, along with implementing operational optimization measures, can potentially achieve energy savings of up to 15%. For a typical container ship, that's significant. This can translate to significant cost reductions in the range of two to five million dollars per year for the ship operator, with a payback period of less than five years based on current fuel prices.

SPEAKER_01 10:00

So why aren't we seeing these technologies being adopted more widely across the global fleet?

SPEAKER_00 10:05

That's a critical question. And the article points to a major underlying issue, known as the principal agent problem. Okay. This is a classic scenario, where the parties making the investment decisions. In this case, the ship owners who purchase and outfit the vessels are often not the same parties, who directly reap the financial benefits of those investments in fuel efficiency.

SPEAKER_01 10:25

Okay.

SPEAKER_00 10:26

Typically the fuel costs are borne by the charterers who lease the ship for a specific period and pay for its operation. So the ship owner incurs the upfront cost of investing in efficiency-enhancing technology. But the charterer enjoys the lower fuel bills during their lease.

SPEAKER_01 10:43

Ah, so the person paying for it isn't the one who's necessarily reaping all the benefits.

SPEAKER_00 10:47

Aaron Powell Exactly. This misalignment of incentives creates a significant barrier to the widespread adoption of these beneficial technologies.

SPEAKER_01 10:54

Aaron Powell The article mentions some potential innovative contract structures that have been proposed to address this issue. Right. What kind of solutions are they suggesting?

SPEAKER_00 11:03

Aaron Ross Powell The core idea behind these proposed solutions is to create contractual mechanisms that would allow shipowners to share in the fuel cost savings that result from their investments in efficiency technologies.

SPEAKER_01 11:15

Trevor Burrus Okay, so changing who benefits how.

SPEAKER_00 11:18

Exactly. This could involve various approaches, such as shared savings agreements, where the owner and charterer split the benefits or adjustments to the charter rates. That take into account the vessel's fuel efficiency. However, as the article notes, these types of innovative contract configurations haven't yet achieved widespread adoption in the shipping industry.

SPEAKER_01 11:39

So they're out there, but they're not widely used.

SPEAKER_00 11:42

Right.

SPEAKER_01 11:42

Another hurdle mentioned in the article is the inherent uncertainty in accurately predicting the exact energy savings that a specific ship will achieve. From implementing a particular technology, it makes sense. But each vessel and each voyage can have unique characteristics.

SPEAKER_00 11:58

Exactly. Numerous factors, including prevailing weather conditions, the amount of cargo being carried, and the specific operational profile of voyage can all influence the actual fuel savings realized. From given technology.

SPEAKER_01 12:20

This includes things like continuous in-service performance monitoring, standardized and transparent sea trials, and independent verification of claimed fuel savings, more reliable data, and greater transparency would help to reduce the perceived risk associated with investing in these technologies. So having better data could help encourage more adoption. Exactly. Now when we talk about an industry as global as maritime shipping, we have to consider the role of international regulatory bodies. Right. The article highlights the IMO, which is the International Maritime Organization and the European Union as key players. In establishing policies aimed at improving the energy efficiency and reducing the emissions intensity of the sector, what kind of regulations are they currently implementing or considering?

SPEAKER_00 13:06

The article outlines three primary categories of regulatory interventions. Firstly, there are regulations focused on the emissions intensity of the fuels themselves. These aim to incentivize the transition towards alternative lower emission fuels by setting targets for the amount of greenhouse gases associated with the energy used the EU's fuel EU maritime regulation. And the IMO's proposed greenhouse gas fuel standard are examples of this approach. While these regulations don't directly mandate energy efficiency improvements in ships, they can indirectly drive them, especially if the alternative fuels are more expensive, making any reduction in overall fuel consumption more economically attractive.

SPEAKER_01 13:47

So making cleaner fuels more appealing. What's the second category?

SPEAKER_00 13:50

The second category involves putting a price on greenhouse gas emissions from shipping. These market-based mechanisms, such as carbon taxes or emissions trading systems, aim to internalize the environmental costs of shipping. The EU has already included maritime transport in its emissions trading scheme, ETS. And the IMO is also actively discussing potential economic measures. The idea is that by making carbon emissions more expensive, these policies will indirectly incentivize ship operators to reduce their fuel consumption through efficiency improvements. Although, as we discussed, the principal agent problem and the uncertainty around savings could limit the effectiveness of this approach.

SPEAKER_01 14:30

Right. So the cost of emitting carbon becomes a direct factor and the overall operating cost for the shipping industry. Exactly. And what's the third type of regulation?

SPEAKER_00 14:37

The third category focuses on setting specific standards for the energy efficiency of ships themselves. The IMO already has regulations in place, such as the Energy Efficiency Design Index, EDA, for new ships, and the Energy Efficiency for Existing Ships Index, EAXI, and the Carbon Intensity Indicator, CI, for existing vessels. These standards aim to drive down the amount of emissions per unit of transport work. And they've largely been met through a combination of improvements in ship design and operational efficiency. However, with the increasing availability of alternative fuels, there's a concern that ship owners might prioritize switching to these fuels rather than investing in further energy efficiency measures, which is an issue the IMO is currently addressing and its ongoing revision to these regulations.

SPEAKER_01 15:25

Aaron Powell So it's a lot of moving pieces.

SPEAKER_00 15:27

Aaron Powell There are a lot of moving pieces, but it's important to note that these regulations are constantly evolving as the industry changes and new technologies become available.

SPEAKER_01 15:34

The article also touches on some of the broader benefits of improving energy efficiency in shipping beyond just the crucial aspect of reducing greenhouse gas emissions. What are some of those additional advantages?

SPEAKER_00 15:45

Well, one significant benefit is reducing the vulnerability of the shipping sector to the potential supply shortages and price volatility of alternative fuels. As the transition accelerates, if the industry can lower its overall fuel demand through efficiency improvements, it will be less exposed to these risks, which could help to stabilize shipping costs.

SPEAKER_01 16:07

That's a really important point, especially when you consider the potential competition for sustainable fuels from other major sectors like aviation.

SPEAKER_00 16:16

Exactly. Okay. And by consuming less fuel overall, energy efficiency improvements can also play a vital role in limiting increases in shipping costs. As the sector shifts towards potentially more expensive alternative fuels, this in turn can help to keep the prices of the goods you purchase more stable.

SPEAKER_01 16:34

So it's all kind of connected.

SPEAKER_00 16:36

It's all connected.

SPEAKER_01 16:36

Improving energy efficiency in maritime shipping isn't just about protecting the environment. It can also make sound economic sense and contribute to a smoother and more cost-effective transition to a lower carbon future.

SPEAKER_00 16:47

Absolutely. The central argument presented in the article is that there is substantial potential right now to achieve significant improvements in energy efficiency in both new and existing ships by utilizing technologies that are already commercially available. However, to fully realize this potential, we need clearer and more targeted policies that can effectively address the existing market barriers, particularly the persistent principal agent problem.

SPEAKER_01 17:14

Okay, let's recap. We've learned how the historical gains in energy efficiency in maritime shipping were primarily achieved through the adoption of slower speeds and the deployment of larger vessels, often as a direct response to rising fuel costs, and the introduction of initial regulations, we also discussed the inherent limitations in pushing these particular trends much further. Then we explored the significant, yet largely untapped, potential of a range of commercially available energy efficiency technologies, providing examples such as waste heat recovery systems, hull optimization techniques, air lubrication systems, and even the promising development of kite sales. We highlighted the compelling economic arguments for adopting many of these technologies right now, as they offer substantial energy and cost savings. With relatively short payback periods for ship operators, we also touched on the even greater potential for further efficiency gains with more advanced technologies. Although these may require higher upfront investment, but we can't overlook the significant obstacles to wider adoption with the principal agent problem, the fundamental disconnect between who pays for the efficiency upgrades and who directly benefits from the resulting fuel savings, standing out as a major impediment. Absolutely. The uncertainty surrounding the precise energy savings achievable on individual ships also contributes to this challenge, underscoring the critical need for improved performance measurement and verification in real-world operating conditions. Finally, we examined the role of international regulatory bodies like the IMO and the EU, noting how various policy instruments, including fuel emission intensity standards, emissions pricing schemes, and ship emission intensity standards, can indirectly incentivize energy efficiency improvements. However, we also acknowledged how the principal agent problem can potentially undermine the effectiveness of these policies. In driving widespread adoption of efficiency measures, we also connected these potential efficiency gains to broader benefits, such as reducing the risks associated with alternative fuel supply and price volatility and mitigating potential increases in shipping costs. Exactly. So the core message seems to be this: we're not starting from scratch. Meaningful progress has already been made in making maritime shipping more energy efficient. However, there's a vast amount of untapped potential within the existing technological landscape. The crucial challenge now is to identify and implement effective strategies, to overcome the identified market barriers and create the right set of incentives. That will drive the widespread adoption of these readily available energy saving solutions across the global fleet, ultimately benefiting both the environment and the economy. The technological solutions are often already available and economically viable. The key challenge lies in establishing the right conditions and incentives to ensure their widespread implementation throughout the industry, considering the substantial cost savings that have already been achieved through energy efficiency improvements in maritime shipping, and the even greater potential that exists with currently available technology. What innovative solutions could effectively incentivize collaboration between ship owners and charterers to fully unlock these remaining energy and emissions reductions in the maritime sector? That's something for you to think about. As we conclude this deep dive, thanks for joining us.