Solar Energy

Tripling renewable energy by 2030 ‘ambitious but doable’

Published

8 months ago

November 30, 2023

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Tripling renewable energy by 2030 ‘ambitious but doable’

By Catherine HOURS

Paris (AFP) Nov 30, 2023

Host United Arab Emirates wants nearly 200 nations attending the COP28 climate summit starting Thursday to commit to tripling installed renewable energy capacity worldwide by 2030, a goal experts say is “ambitious but achievable”.

If the UN forum sets that target in stone, it could become a key marker of COP28’s success, especially if coupled with a pledge to drawn down fossil fuel use.

– Why triple renewable energy? –

In September, the G20 — accounting for 80 percent of global greenhouse gas emissions — broke new ground in endorsing the goal of tripling renewable energy capacity by the end of the decade.

The club of major economies remained silent, however, on the need to reduce fossil fuel use, which will also be on the table during the two-week meeting in Dubai.

For Dave Jones, an expert with think tank Ember, the G20’s statement has helped push renewables back to centre stage.

“We were too busy worrying about hydrogen and carbon capture,” he told AFP. “Those technologies are going to help solve the problem, but they are not going to be the driving force behind the solution.”

All credible pathways for achieving global carbon neutrality by mid-century depend on massively scaling up wind, solar, hydroelectric and other renewable energies, such as biomass.

This is “the single most important lever” for reducing carbon pollution from burning fossil fuels, and capping warming under the Paris Agreement threshold of 1.5 degrees Celsius compared with the pre-industrial period, the International Energy Agency (IEA) has said.

“Achieving net zero emissions from the energy sector by 2050 rests on the world’s ability to triple renewable energy capacity by 2030,” the intergovernmental body said in a recent report.

Doing so would avoid some seven billion tonnes of CO2 emissions over the next seven years, putting a big dent in the 37 billion tonnes that the world currently emits every year.

Rapid expansion of renewables would cover skyrocketing demand for electricity linked to transport, heating and especially air conditioning.

It would also cut in half the amount of electricity generated by coal, the number one source of CO2.

– How much energy? –

“Concretely, we’d need to increase from 3,600 gigawatts (GW) from renewables at the end of 2022 to 11,000 GW in 2030,” explained Jones.

That would mean adding 1,500 GW of new installed capacity every year by 2030, up from 300 GW in 2022 and an estimated 500 GW in this year.

Progress is visible. Between 2015 and 2022, renewable capacity increased 11 percent per year, on average.

Against a backdrop of soaring oil prices and energy insecurity linked to the war in Ukraine, the IEA forecasts unprecedented growth of about 30 percent in 2023.

China could reach its 2030 target of 1,200 GW capacity from photovoltaics five years early. A surge in the supply of components — mostly from China — could help ensure an additional 1,000 GW of solar capacity by the end of next year, Jones said.

Wind power, however, has hit obstacles in the form of rising costs and interest rates.

Not all countries will have to make the same efforts to slash emissions. Of 57 nations analysed, more than half were on track to meet or exceed their 2030 targets, the Ember analysis points out.

But other large emitters such as Australia, Japan, South Korea and United Arab Emirates still have lots of room for improvement.

– How can this be achieved? –

Last year, 1,000 GW of wind and solar power capacity in the pipeline failed to materialise due to underdeveloped electricity grids and obstacles to permitting, according to the Ren21 research network.

Another bottleneck is finance. Wind and solar are the cheapest way to generate energy and are quick to deploy, but require investment to get off the ground, particularly in emerging and developing countries.

And yet only two percent of energy transition investment between 2000 and 2020 went to Africa, where half the population still lacks electricity, according to the Renewable Energy Agency (Irena).

“We need four trillion dollars a year and we’re a long way from that,” said Ren21 director Rana Adib. “We know that the energy transition also means stopping new investment in fossil fuels”.

In 2022, hydrocarbons were subsidised twice as much as in 2021 to the tune of nearly $1.3 trillion in G20 countries alone, according to BloombergNEF.

This “could have financed 1,900 GW of solar power plants, or ten times the capacity installed by the G20 last year,” the energy think tanks calculated.

The consequence of this situation is clear, insisted Adib, with oil, gas and coal still accounting for more than 80 percent of the world’s final energy consumption, a rate that has not changed for years.

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Solar Energy

3D-printed microstructure forest enhances solar steam desalination

Published

2 days ago

July 24, 2024

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3D-printed microstructure forest enhances solar steam desalination

by Clarence Oxford

Los Angeles CA (SPX) Jul 24, 2024

To address the global freshwater scarcity issue, researchers in Singapore have developed advanced solar steam generators (SSGs) for seawater desalination. This method, powered by renewable energy, mimics the natural water cycle by using solar energy to evaporate and purify water, offering a potentially cost-effective solution compared to traditional, energy-intensive desalination techniques. However, current SSG technologies face limitations due to the complexity of fabricating designs that maximize surface area for optimal water evaporation.

Drawing inspiration from nature, the team utilized 3D printing to create innovative SSGs. Their findings, published in Applied Physics Reviews, highlight a novel technique for manufacturing efficient SSGs and introduce a groundbreaking method for printing functional nanocomposites using multi-jet fusion (MJF).

“We created SSGs with exceptional photothermal performance and self-cleaning properties,” said Kun Zhou, a professor of mechanical engineering at Nanyang Technological University. “Using a treelike porous structure significantly enhances water evaporation rates and ensures continuous operation by preventing salt accumulation – its performance remains relatively stable even after prolonged testing.”

The technology works by converting light to thermal energy, where SSGs absorb solar energy and convert it to heat to evaporate water. The porous structure of the SSGs aids in self-cleaning by removing accumulated salt, ensuring sustained desalination performance.

“By using an effective photothermal fusing agent, MJF printing technology can rapidly create parts with intricate designs,” Zhou added. “To improve the photothermal conversion efficiency of fusing agents and printed parts, we developed a novel type of fusing agent derived from metal-organic frameworks.”

The SSGs feature miniature tree-shaped microstructures that mimic plant transpiration, forming an efficient, heat-distributing forest.

“Our bioinspired design increases the surface area of the SSG,” Zhou explained. “Using a treelike design increases the surface area of the SSG, which enhances the water transport and boosts evaporation efficiency.”

In both simulated environments and field trials, the SSGs exhibited a high rate of water evaporation. The desalinated water consistently met drinking water standards, even after extended testing.

“This demonstrates the practicality and efficiency of our approach,” Zhou said. “And it can be quickly and easily mass-produced via MJF commercial printers.”

The team’s work shows significant potential for tackling freshwater scarcity.

“Our SSGs can be used in regions with limited access to freshwater to provide a sustainable and efficient desalination solution,” said Zhou. “Beyond desalination, it can be adapted for other applications that require efficient solar energy conversion and water purification.”

Research Report:3D printing of bio-inspired porous polymeric solar steam generators for efficient and sustainable desalination

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Solar Energy

Renewables overproduction turns electricity prices negative

Published

3 days ago

July 24, 2024

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Renewables overproduction turns electricity prices negative

By Nathalie Alonso and Catherine Hours

Paris (AFP) July 24, 2024

With the proliferation of solar panels and wind turbines an unusual phenomenon is becoming more and more frequent: wholesale electricity prices turn negative.

While that may brighten the mood of consumers whose power bills have surged in recent years, it could undermine the further development of renewables, a key element in the fight against global warming.

The increasingly frequent phenomenon is “extremely problematic” for the wind and solar sector, said Mattias Vandenbulcke, strategy director of the renewables industry group France Renouvelables.

“It allows some to have harmful, even dangerous rhetoric which says ‘renewables are useless’,” Vandenbulcke said.

In southern Australia, wholesale electricity prices have been negative some 20 percent of the time since last year, according to the International Energy Agency.

The share of negatively priced hours in southern California was above 20 percent in the first half of the year, more than triple from the same period in 2023, the IEA said.

In the first six months of the year in France, there were negative prices around five percent of the time, beating the record set last year, according to the electricity grid operator RTE.

In Switzerland the price tumbled as far as -400 euros (-$436) per megawatt hour on July 14. The lowest prices are usually recorded around midday during the summer when solar production is at its peak.

– ‘A warning signal’ –

The trend has been accelerating for the past three years as demand in Europe has unexpectedly dropped since the Covid pandemic and the war in Ukraine.

Prices turn negative on the spot wholesale electricity market when production is strong while demand is weak.

Around a fifth of the total is traded on this market, where electricity is bought for the following day.

Negative prices help reduce the bills of consumers, said Rebecca Aron, head of electricity markets at French renewables firm Valorem, but the impact is delayed and difficult to discern among the other factors that send prices higher and lower.

Large, industrial consumers that can shift production to times when prices are negative and buy on wholesale markets can reap the biggest rewards.

Negative prices are “a warning signal that there is way too much production on the electrical grid”, said energy analyst Nicolas Goldberg at Colombus Consulting.

Electricity grids need to be kept constantly in balance. Too much can lead to the electricity to increase in frequency beyond norms for some equipment. Too little can lead to some or all customers losing power.

There are currently few options to stock surplus electricity production so producers have to reduce output.

Many renewable producers stop their output when prices are set to turn negative. It takes one minute to stop output at a solar park, two to three minutes for a wind turbine.

But not all stop their production.

– Tripling renewables –

“Renewable energy can be controlled, but depending on production contracts, there might not necessarily be an incentive to stop,” said Mathieu Pierzo at French grid operator RTE, which has the responsibility for balancing the electricity load.

Some producers are paid a fixed price under their contract or are compensated by the state if prices fall below a certain level.

Fossil fuel and nuclear power plants can adjust their production to some extent, but halting and restarting output is costly.

In the future, solar and wind will also have to “participate more in balancing the electricity system”, Pierzo said.

Solar and wind production is set to rise further as nations agreed at the COP28 climate conference last year to triple renewable energy capacity by 2030 as part of efforts to limit warming to 1.5 degrees Celsius compared with pre-industrial levels.

“Rising frequency of negative prices sends an urgent signal that greater flexibility of supply and demand is needed,” the Paris-based IEA warned last week.

“The appropriate regulatory frameworks and market designs will be important to allow for an uptake in flexibility solutions such as demand response and storage,” it said.

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Solar Energy

NREL explores long-term strategies for sustainable perovskite solar panels

Published

3 days ago

July 24, 2024

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NREL explores long-term strategies for sustainable perovskite solar panels

by Clarence Oxford

Los Angeles CA (SPX) Jul 24, 2024

Researchers at the National Renewable Energy Laboratory (NREL) are examining the future of perovskite solar panels, focusing on scaling, deploying, and designing panels to be recyclable.

Perovskite solar panels could play a key role in global efforts to reduce greenhouse gas emissions. With the technology still in its developmental stages, researchers are emphasizing the importance of designing these panels to minimize environmental impact.

“When you have a technology in its very early stages, you have the ability to design it better. It’s a cleaner slate,” said Joey Luther, a senior research fellow at the U.S. Department of Energy’s (DOE’s) National Renewable Energy Laboratory (NREL) and coauthor of the newly published article in the journal Nature Materials. “Pushing perovskite PV toward enhanced sustainability makes more sense at this stage. We’re thinking about how we can make sure we have a sustainable product now rather than dealing with sustainability issues toward the end of its practical life.”

The article highlights the PV research community’s influential position to prioritize remanufacturing, recycling, and reliability efforts, aiming to make perovskite PV one of the most sustainable energy sources available.

“Perovskites could unlock the next evolution of high-efficiency PV, and it is our responsibility to assure they are manufactured, used, and recycled sustainably,” said the lead author of the study, Kevin Prince, a former graduate researcher at NREL who now researches perovskites at Helmholtz Zentrum Berlin in Germany.

While silicon solar panels dominate the industry and cadmium telluride (CdTe) panels have established recycling programs, perovskites are at a critical point where sustainability issues can be addressed from the start.

The most effective circular economy begins at the design stage, considering materials sourcing, product lifetime, and end-of-life management. Researchers suggest assessing environmental impacts by looking at carbon emissions during production, embodied energy, sustainable material sourcing, and module circularity.

The journal article identifies critical sustainability concerns for each component of a perovskite solar panel. For instance, lead can be diluted with metals like tin to reduce lead content, though this may affect PV efficiency and durability. Expensive precious metals such as silver and gold could be replaced with cheaper alternatives like aluminum, copper, or nickel. Fluorine-tin oxide is recommended over the scarcer indium-tin oxide for front electrodes.

“We want to have the lowest amount of embodied energy in the fabrication,” Luther said. “We want to have the lowest amount of emissions in the fabrication. At this stage, now is the chance to look at those components. I don’t think we have to change anything. It’s more a matter of what decisions should be made, and these arguments should certainly be discussed.”

The authors discuss various ways to improve the circularity of perovskite panels. Remanufacturing involves reusing parts from old modules to make new ones, while recycling converts waste materials into raw materials for reuse. Attention is needed for the specialized glass used in perovskite modules, which is crucial for structural support and protection while allowing maximum sunlight penetration. Establishing a recycling pathway for this glass will be essential as PV deployment increases.

Silvana Ovaitt, a PV researcher and coauthor of the paper, noted that cleaner electricity grids will lead to cleaner manufacturing processes, further reducing emissions.

“Another concern is the transportation of the final modules and the raw glass because those are the heaviest items,” Ovaitt said. “Local manufacturing will be a great way to reduce those carbon impacts.”

The researchers explain that increasing the durability of PV modules, thereby extending their useful life, is a more effective approach to reducing net energy, energy payback, and carbon emissions than designing for circularity alone. A longer lifespan means panels won’t need to be recycled as often.

“Ultimately, we want to make them as durable as possible,” Luther said. “But we also want to consider the aspects of whenever that time does come. We want to be deliberate about how to take them apart and to reuse the critical components.”

Research Report:Sustainability pathways for perovskite photovoltaics