energy collected from renewable resources From Wikiquote, the free quote compendium
Renewable energy is energy that is collected from renewable resources that are naturally replenished on a human timescale. It includes sources such as sunlight, wind, rain, tides, waves, and geothermal heat. Renewable energy stands in contrast to fossil fuels, which are being used far more quickly than they are being replenished. Although most renewable energy sources are sustainable, some are not. For example, some biomass sources are considered unsustainable at current rates of exploitation.
Although photosynthesis typically has an energy conversion efficiency below three percent, it is, together with heat from the sun, the main energy source of all living organisms, and the energy source from which biomass and fossil fuels are derived. Each year the earth receives an energy input from the sun equal to 15,000 times the world's commercial energy consumption and 100 times the world's proven coal, gas and oil reserves.
Bernhard Scheffler, quoted by J. Clarke and D. Holt-Biddle in Coming Back to Earth, p. 78 (2002)
There is one forecast of which you can already be sure: someday renewable energy will be the only way for people to satisfy their energy needs. Because of the physical, ecological and (therefore) social limits to nuclear and fossil energy use, ultimately nobody will be able to circumvent renewable energy as the solution, even if it turns out to be everybody’s last remaining choice. The question keeping everyone in suspense, however, is whether we shall succeed in making this radical change of energy platforms happen early enough to spare the world irreversible ecological mutilation and political and economic catastrophe.
More solar energy falls on Earth in one hour than all the energy our civilization consumes in an entire year. If we could harness a tiny fraction of the available solar and wind power, we could supply all our energy needs forever, and without adding any carbon to the atmosphere.
Every percentage point increase in homegrown renewable energy makes us that much more energy secure. The progress in electricity is encouraging, but growth is not yet strong enough in renewable heat and transport to meet the government's objectives.
If you told me that innovation had been frozen and we just have today's technologies, will the world run the climate change experiment? You bet we will. We will not deny India coal plants; we will run the scary experiment of heating up the atmosphere and seeing what happens. The only reason I'm optimistic about this problem is because of innovation. . . . I want to tilt the odds in our favor by driving innovation at an unnaturally high pace, or more than its current business-as-usual course. I see that as the only thing. I want to call up India someday and say, "Here's a source of energy that is cheaper than your coal plants, and by the way, from a global pollution and local pollution point of view, it's also better."
Cheaper coal and cheaper gas will not derail the transformation and decarbonisation of the world’s power systems. By 2040, zero-emission energy sources will make up 60% of installed capacity.
We have long supported a carbon tax as the best policy of those being considered. Replacing the hodge-podge of current, largely ineffective regulations with a revenue-neutral carbon tax would ensure a uniform and predictable cost of carbon across the economy. It would allow market forces to drive solutions. It would maximize transparency, reduce administrative complexity, promote global participation and easily adjust to future developments in our understanding of climate science as well as the policy consequences of these actions.
Rather than an eyesore on the roof, it becomes actually a feature of the home. People are going to start wanting to put {building-integrated photovoltaics} on the front side of their home to show that they have solar.
[W]ind and solar power have been rapidly winning market acceptance. Last year, the installed capacity of solar power in the United States nearly doubled. And wind is now being harnessed to produce 5.5 percent of America’s electricity, according to the U.S. Energy Information Administration.
The transition to renewable energy can be greatly accelerated if the world’s governments finally bring the engineers to the fore... I was recently on a panel with three economists and a senior business-sector engineer. After the economists spoke... the engineer spoke succinctly and wisely. “I don’t really understand what you economists were just speaking about, but I do have a suggestion... Tell us engineers the desired ‘specs’ and the timeline, and we’ll get the job done.” This is not bravado.... The next big act belongs to the engineers. Energy transformation for climate safety is our twenty-first-century moonshot.
A carbon tax offers the most cost-effective lever to reduce carbon emissions at the scale and speed that is necessary. By correcting a well-known market failure, a carbon tax will send a powerful price signal that harnesses the invisible hand of the marketplace to steer economic actors towards a low-carbon future. . . . A consistently rising carbon price will encourage technological innovation and large-scale infrastructure development.
"Economists’ Statement on Carbon Dividends: Bipartisan agreement on how to combat climate change." (Statement signed by more than 3,500 economists, including every living former chair of the U.S. Federal Reserve and 27 Nobel laureates.)
Offshore wind's remarkable potential: The global offshore wind market grew nearly 30% per year between 2010 and 2018, benefitting from rapid technology improvements and about 150 new offshore wind projects . . . in active development around the world. . . . Yet today's offshore wind market doesn't even come close to tapping the full potential - with high-quality resources available in most major markets, offshore wind has the potential to generate more than 420,000 [terawatt-hours] per year worldwide. This is more than 18 times global electricity demand today.
Offshore wind is in a category of its own, as the only variablebaseload power generation technology. . . . Offshore wind output . . . hourly variability is lower than that of solar [photovoltaics]. Offshore wind typically fluctuates within a narrower band, up to 20% from hour-to-hour, than is the case for solar [photovoltaics], up to 40% from hour-to-hour.
An old proverb states: When the winds of change blow, some build walls . . . others build windmills. So, fellow windmill builders: Let’s push back on doubt and fear. Climate disasters worldwide tell us that the scariest thing we could do is nothing at all. . . . [W]e’ll all gain when we succeed - starting with jobs! We’re looking at a $23 trillion global market in the clean energytransition by 2030. . . . That means we can remake our economies, build new businesses, and put millions upon millions of people to work. . . . For too long, the climate conversation has been viewed as a zero-sum game. One of trade-offs: the climate or the economy. No longer.
There are two practical ways to create the magic conditions that make fusion happen. One is called magnetic confinement fusion and the other is inertial confinement fusion. There’s gravity too, of course, but for that you need scales bigger than can be created on Earth: you need, quite literally, a star. The magnetic approach is to bind the hot matter in a reactor with an invisible web of magnetic fields. The inertial approach sets matter crashing into itself, thereby both heating and compressing it, and aims to get all the fusion done before the assembled star matter falls apart again. NIF {the National Ignition Facility} uses lasers to do this.
There’s one aspect of the current fleet of magneticfusion machines that is holding back progress. It’s a lesson that has been learned time and time again in fusion: . . . fusion works best on big scales. For conventional tokamaks, the confinement of plasma gets better the bigger the machine is. . . . When it is completed, ITER will be the world’s largest tokamak, and one of its key objectives will be to demonstrate net energy gain. It’s a behemoth. . . . ITER will take up 180 hectares (equivalent to 250 soccer fields), and when finished, its structure will have a mass equivalent to three Eiffel Towers.
Future Outlook: Global offshore wind energy deployment is expected to accelerate in the future, with forecasts from 4C Offshore and Bloomberg New Energy Finance indicating a sevenfold increase in global cumulative offshore wind capacity - to 215 [gigawatts] or more by 2030 (BNEF 2020; 4C Offshore 2021). As part of that predicted surge, the U.S. offshore wind energy market continues to expand, primarily driven by increasing state-level procurement targets in the Northeast and mid-Atlantic, an increased number of projects clearing major permitting milestones, as well as growing vessel, port, and infrastructure investments needed to keep pace with development.
In 2006, I hosted a dinner after a screening of An Inconvenient Truth, former vice president Al Gore's seminal documentary on the climate crisis. We went around the table for everyone's reaction to the film's urgent message. When it came to my fifteen-year-old daughter, Mary, she declared with her typical candor: "I'm scared, and I'm angry." Then she added, "Dad, your generation created this problem. You better fix it." . . . As a venture capitalist, my job is to find big opportunities, target big challenges, and invest in big solutions. I was best known for backing companies like Google and Amazon early on. But the environmental crisis dwarfed any challenge I'd ever seen. . . . Eugene Kleiner, the late cofounder of Kleiner Perkins . . . left behind a set of twelve laws that [included the following:] There is a time when panic is the appropriate response. That time had come. . . . My partners and I made climate a top priority. We got serious about investing in clean and sustainable technologies . . . . Our climate investments were [slow] out of the gate, and many of them failed. . . . But with patience and persistence [by 2019] our surviving cleantech investments began to hit one home run after the next. [However, we currently] have no time for a victory lap. . . . Atmospheric carbon already exceeds the upper limit for climate stability. . . . The effects of runaway global warming are already plain to see: devastating hurricanes, biblical flooding, uncontrollable wildfires, killer heat waves, and extreme droughts. . . . I must warn you up front: we're not cutting emissionsfast enough to outrun the damage on our doorstep. I said this in 2007, and I say it again today: what we're doing is not nearly enough. Unless we course correct with urgent speed and at a massive scale, we'll be staring at a doomsday scenario. The melting polar ice caps will drown coastal cities. Failed crops will lead to widespread famine. By midcentury, a billion souls worldwide could be climate refugees. . . . Fortunately, we have a powerful ally in this fight: innovation. Over the past fifteen years, prices for solar and wind power have plunged 90 percent. . . . Batteries are expanding the range of electrified vehicles at an ever lower cost. Greater energy efficiency has sharply reduced greenhouse gas emissions. . . . While a good many solutions are in hand, their deployment is nowhere near where it needs to be. We'll need massive investment and robust policy to make these innovations more affordable. We need to scale the ones we have - immediately - and invent the ones we still need. In short, we need both the now and the new.
When it comes to climate change, I know innovation isn’t the only thing we need. But we cannot keep the earth livable without it. Techno-fixes are not sufficient, but they are necessary.
Deploying today’s renewables and improving transmission couldn’t be more important. . . . Unless we use large amounts of nuclear energy . . . every path to zero {net emissions} in the United States will require us to install as much wind and solar power as we can build and find room for. It’s hard to say exactly how much of America’s electricity will come from renewables in the end, but what we do know is that between now and 2050 we have to build them much faster - on the order of 5 to 10 times faster - than we’re doing right now. And remember that most countries aren’t as lucky as the United States when it comes to solar and wind resources. The fact that we can hope to generate a large percentage of our power from renewables is the exception rather than the rule. That’s why, even as we deploy, deploy, deploy solar and wind, the world is going to need some new clean electricity inventions too.
[I]t's . . . possible that some innovation will come along and make [other energy storage] ideas obsolete, the way the personal computer came along and more or less made the typewriter unnecessary. Cheap hydrogen could do that for storing electricity. . . . We could use electricity from a solar or wind farm to create hydrogen, store the hydrogen as a compressed gas or in another form, and then put it in a fuel cell to generate electricity on demand. [This] would solve the location problem; . . . although you can't ship sunlight in a railcar, you can turn it into fuel first and then ship it any way you like.
In the midst of this global brainstorming on climate change, on behalf of India, I would like to present five [commitments] to deal with this challenge. First - India will take its non-fossil energy capacity to 500 gigawatts by 2030. Second - India will meet 50 percent of its energy requirements from renewable energy by 2030. . . . And fifth - by the year 2070, India will achieve the target of Net Zero. . . . Today, when India has resolved to move forward with a new commitment and a new energy, the transfer of climate finance and low cost climate technologies have become more important. . . . India also understands the suffering of all other developing countries, shares them, and will continue to express their expectations.
[T]he solution has to be real economy government regulations to ban or to make higher [the] cost of the brown and polluting industries. That said, there are parts of finance which are longer-term and [evaluate] climate risks . . . and these are asset owners, the pension funds, the wealth funds and the insurance companies who are not so transactional [and] they’re not [as] interested in a deal to be done today. And they are in fact often mandated by their governments to take into account climate risk. So, I think those players will step up in this instance [turmoil in energy markets following Russia's 2022 invasion of Ukraine] and [now who might be] investing for [an electricity generation project with a] 10-year horizon which you have to do with gas they will [say], "Let’s do it with renewables." And we’ve seen movements like that in the UK, where they’re pivoting towards onshore wind, which before the invasion was politically unviable because of the NIMBY factor. . . . [T]he pension funds and the actual asset owners . . . have a longer term of perspective. And they are actually driving the issue to their commercial managers who have to service them and they’re saying, "Look, we want you to act on climate change," and that's a huge driver.
Even if you're a climate denier, you should be on board with what we're advocating. . . . Our central conclusion is that we should go full speed ahead with the green energy transition because it's going to save us money.
The global energy crisis is driving a sharp acceleration in installations of renewable power, with total capacity growth worldwide set to almost double in the next five years, overtaking coal as the largest source of electricity generation along the way and helping keep alive the possibility of limiting global warming to 1.5 °C . . . . Global renewable power capacity is now expected to grow by 2,400 gigawatts (GW) over the 2022-2027 period, an amount equal to the entire power capacity of China today, according to Renewables 2022, the latest edition of the IEA {International Energy Agency}’s annual report on the sector. . . . The amount of renewable power capacity added in Europe in the 2022-27 period is forecast to be twice as high as in the previous five-year period, driven by a combination of energy security concerns and climate ambitions. . . . Beyond Europe, the upward revision in renewable power growth for the next five years is also driven by China, the United States and India, which are all implementing policies and introducing regulatory and market reforms more quickly than previously planned to combat the energy crisis. . . . China is expected to account for almost half of new global renewable power capacity additions over the 2022-2027 period. Meanwhile, the US Inflation Reduction Act has provided new support and long-term visibility for the expansion of renewables in the United States. . . . Utility-scale solar PV [photovoltaics] and onshore wind are the cheapest options for new electricity generation in a significant majority of countries worldwide. Global solar PV capacity is set to almost triple over the 2022-2027 period, surpassing coal and becoming the largest source of power capacity in the world. The report also forecasts an acceleration of installations of solar panels on residential and commercial rooftops . . . . Global wind capacity almost doubles in the forecast period, with offshore projects accounting for one-fifth of the growth. Together, wind and solar will account for over 90% of the renewable power capacity that is added over the next five years. . . . While China remains the dominant player [in photovoltaic supply chains], its share in global manufacturing capacity could decrease from 90% today to 75% by 2027. . . . Total global biofuel demand is set to expand by 22% over the 2022-2027 period. . . . In advanced economies . . . faster growth [in renewable power capacity] would require various regulatory and permitting challenges to be tackled and a more rapid penetration of renewable electricity in the heating and transport sectors. In emerging and developing economies, [faster growth] would mean addressing policy and regulatory uncertainties, weak grid infrastructure and a lack of access to affordable financing that are hampering new projects. . . . Worldwide, the accelerated case requires efforts to resolve supply chain issues, expand grids and deploy more flexibility resources to securely manage larger shares of variable renewables. The accelerated case’s faster renewables growth would move the world closer to a pathway consistent with reaching net zero emissions by 2050, which offers an even chance of limiting global warming to 1.5 °C.
About the quote: The above quote summarizing the IEA's annual renewable energy report for 2022 contains very few links to Wikipedia pages or to any other information sources. For further information about any of the words or phrases in the quote, please refer to the report. Also, the quote changes "2 400 GW" (in the original) to "2,400 GW" (using a comma as a thousands-separator rather than a space, following the typical English-language convention).
Offshore windturbines reach even higher and wider than land-based ones. Though twice as expensive as land-based wind, their costs are falling fast. That’s making offshore wind increasingly attractive in coastal regions of Europe and the northeastern United States, where population density is high, land is scarce, and winds over the ocean far outpace those over land.
The [provisions of the proposed Inflation Reduction Act of 2022, including] expansion of the wind and solar credits, the exciting expansion, or creation, of additional credits in green hydrogen, the inclusion of hydrogen cars in electric car credits, the extension of the electric car credits - all those things are good [but they're] not enough. The question now is, what do we do next?
The Inflation Reduction Act calls for spending less than $500 billion over a decade, compared with the American Rescue Plan’s $1.9 trillion in a single year . . . . But if the spending isn’t very large, how can it have such a big impact? The answer is that right now we’re sitting on a sort of cusp. Renewable energy technology has made revolutionary progress, and renewables are already cheaper in many areas than fossil fuels. A moderate push from public policy is all that it will take to transition to a much greener economy. And the Inflation Reduction Act will provide that push.
[The Inflation Reduction Act] . . . doesn’t solve the climate challenge. This is the beginning . . . and the implementation is going to be everything. This is . . . like a starting gun for a race that's going to . . . hopefully define the coming decade of building something better.
Great, that is fantastic . . . . We want to be able to see energy - clean energy - produced in every pocket of the country. Blue states, red states, really it helps to save people money, so it’s all about green.
In the last several months all the key associations looked across the table and realised we were arguing for the same thing. . . . This is Big Wind and Big Solar coming to the table and saying we want to get things done. . . . It will not be possible to achieve anything close to a climate solution with the current {permitting} system in place.
And it's just the beginning. You know, we also protected the most significant breakthrough ever—ever—in dealing with the existential threat of climate change. Today, new wind and solar power is cheaper than fossil fuel. Since I've been in office, clean energy and advanced manufacturing have brought in $470 billion in private investments. That's going to create thousands of jobs—good-paying jobs—all across this country and help the environment at the same time. And remember, at the beginning of this debate, some of my Republican colleagues were determined to gut the clean energy investments. And I said no, and we kept them all.
Electricity generation. We expect that the 23 gigawatts (GW) in 2023 and 37 GW in 2024 of new solar capacity scheduled to come online will help U.S. solar generation grow by 15% in 2023 and by 39% in 2024. We expect solar and wind generation together in 2024 to overtake electric power generation from coal for the first year ever, exceeding coal by nearly 90 billion kilowatthours.
We're not interested in a pilot [climate project] just for experimentation. . . . We're interested in proving that they work and that then we can scale them. . . . Utilities [can't afford to] move fast and break things [but they] can be great mechanisms for scaling up innovation.
I think [it’s] to be determined {whether the post-pandemic, low-interest-rate-fueled investment spike which flowed to non-governmental fusion companies will actually result in commercially viable fusion power}. . . . When interest rates were low, people were willing to make long-term bets. [However, the] level of investment was substantial, and it should yield technological progress.
Carlos Paz-Soldan, physics professor at Columbia University, as quoted in a National Public Radio article entitled "Companies say they're closing in on nuclear fusion as an energy source. Will it work?" (The article tracks a Morning Edition embedded audio transmission segment, and it paraphrases Paz-Soldan’s conclusion that since interest rates have gone up recently, fusion companies which can’t show significant progress may not be able to raise money in future venture rounds.) (Dec. 4, 2023)
If the world is to decarbonise, then more clean energy is needed, fast. [To meet current UNFCCC pledges, countries must] raise global renewable-energy capacity to 11,000 gigawatts (GW) by 2030. [However, supply chain problems and rising interest rates cloud the industry's future. Another obstacle is slow permitting] approval, which delays projects for years and can needlessly tie up capital, lowering returns. [And,] too little development is happening in the global south [because investors require a premium when venturing money in emerging markets]. A last obstacle is protectionism, which raises costs and threatens shortages. . . . Rather than micromanaging production, governments should unleash investment, by acting boldly to strip back permitting rules and ease the risk of projects in the global south [which can come from blending in government money in southern projects that assumes some risk]. They also need to face up to the fact that protectionism frustrates their climate goals. It leads to lower returns, higher prices for power and more broken promises over decarbonisation.
The Economist (in keeping with longstanding tradition Economist articles are typically unsigned, which permits the news magazine to speak with one collective voice). Excerpted from an article in a Dec. 9th - 15th 2023 physical copy of the magazine entitled "Power Trip: Expanding renewable-energy capacity is becoming worryingly hard." An online (subscription-required) version of the article can be found here. (Dec. 7, 2023)
We are edging ever-closer to a fusion-powered reality. And at the same time, yes, significant scientific and engineering challenges exist. . . . Careful thought and thoughtful policy is going to be critical to navigate this.
John Kerry, U.S. Special Presidential Envoy for Climate speaking at the COP28 climate summit, announcing that the US would seek to cooperate with other nations in five areas related to fusion power development: research, future marketplace development, regulatory frameworks, maintaining a workforce pipeline, and improving public education / engagement. Kerry's announcement echoed the themes in a White House press release issued three days earlier. The quote comes from an Associated Press article entitled "At COP28, John Kerry unveils nuclear fusion strategy as a source of clean energy;" the article was written by Jennifer McDermott. (Dec. 5, 2023)
Tripling {global renewable energy capacity} is a monumental change. . . . We don't have any structures that fit 100% with the new system that is coming.
Francesco La Camera, Director-General of the International Renewable Energy Agency (IRENA), commenting on the challenges of achieving a tripling target that was embraced by the COP delegates after it was promoted by IRENA. The quote is from an article in a Dec. 14th physical copy of The Wall Street Journal entitled "Climate Deal Puts Pressure on Renewables: Price drops, surging growth in solar and wind make goals more realistic." Article written by Ed Ballard. An online (subscription-required) version of the article can be found here. (Dec. 13, 2023)
This is not a transition that will happen from one day to the other . . . . Whole economies and societies are dependent on fossil fuels. Fossil capital will not disappear just because we made a decision here. [But the COP28 final agreement sends] a strong political message that this is the pathway.
[1] 2023 saw a step change in renewable capacity additions, driven by China’s solar PV market. Global annual renewable capacity additions increased by almost 50% to nearly 510 gigawatts (GW) in 2023, the fastest growth rate in the past two decades. . . . [2] Achieving the COP28 target of tripling global renewable capacity by 2030 hinges on policy implementation. . . . [C]hallenges [that could prevent reaching the tripling goal] fall into four main categories and differ by country: 1) policy uncertainties and delayed policy responses to the new macroeconomic environment; 2) insufficient investment in grid infrastructure preventing faster expansion of renewables; 3) cumbersome administrative barriers and permitting procedures and social acceptance issues; 4) insufficient financing in emerging and developing economies. . . . [3] The global power mix will be transformed by 2028. . . . In 2028, renewable energy sources [are expected to] account for over 42% of global electricity generation, with the share of wind and solar PV doubling to 25%. . . . [4] China is the world’s renewables powerhouse. . . . China’s role is critical in reaching the global goal of tripling renewables because the country is expected to install more than half of the new capacity required globally by 2030. . . . [5] The US, the EU, India and Brazil remain bright spots for onshore wind and solar PV growth. . . . Supportive policy environments and the improving economic attractiveness of solar PV and onshore wind are the primary drivers behind this acceleration. . . . [6] Solar PV prices plummet amid growing supply glut. . . . Despite unprecedented PV manufacturing expansion in the United States and India driven by policy support, China is expected to maintain its 80‑95% share of global supply chains . . . . [7] Onshore wind and solar PV are cheaper than both new and existing fossil fuel plants. . . . Despite the increasing contribution needs for flexibility and reliability to integrate variable renewables, the overall competitiveness of onshore wind and solar PV changes only slightly by 2028 in Europe, China, India and the United States. . . . [8] The new macroeconomic environment presents further challenges that policy makers need to address. . . . Since 2022, central bank base interest rates have increased from below 1% to almost 5%. . . . The implications . . . are manifold . . . . [I]nflation has increased equipment costs . . . [H]igher interest rates are increasing the financing costs of capital-intensive variable renewable technologies. . . . [And] policy has been relatively slow to adjust to the new macroeconomic environment due in part to expectations that cost reductions would continue . . . . [9] The forecast for wind capacity additions is less optimistic outside China, especially for offshore. . . .The wind industry, especially in Europe and North America, is facing challenges due to a combination of ongoing supply chain disruptions, higher costs and long permitting timelines. . . . [10] Faster deployment of variable renewables increases integration and infrastructure challenges. . . . Although European Union interconnections help integrate solar PV and wind generation, grid bottlenecks will pose significant challenges and lead to increased curtailment in many countries as grid expansion cannot keep pace with accelerated installation of variable renewables. . . . [11] Current hydrogen plans and implementation don’t match. . . . We have revised down our forecasts for all regions except China. The main reason is the slow pace of bringing planned projects to final investment decisions due to a lack of off‑takers and the impact of higher prices on production costs. . . . [12] Biofuel deployment is accelerating and diversifying more into renewable diesel and biojet fuel. . . . Emerging economies, led by Brazil, dominate global biofuel expansion . . . . Biofuels remain the dominant pathway for avoiding oil demand in the diesel and jet fuel segments. EVs outpace biofuels in the gasoline segment, especially in the United States, Europe and China. . . . [13] Aligning biofuels with a net zero pathway requires a huge increase in the pace of deployment. . . . Much faster biofuel deployment is possible through new policies and addressing supply chain challenges. [14] Renewable heat accelerates amid high energy prices and policy momentum – but not enough to curb emissions. . . . [The renewable heat acceleration comes] predominantly from the growing reliance on electricity for process heat – notably with the adoption of heat pumps in non‑energy‑intensive industries – and the deployment of electric heat pumps and boilers in buildings, increasingly powered by renewable electricity.
About the quote: The above quote of phrases from the executive summary of the IEA's annual renewable energy report for 2023 contains no links to Wikiquote pages, Wikipedia pages, or to any other information sources. For further information about any of the words or phrases in the quote, please refer to the report. Also, the quote adds bracketed numbers to clarify where each of the fourteen sections in the summary begins. The numbers are a de minimis (or insignificant) addition to the original text inserted for clarification purposes only and do not appear in the IEA's original report.