Tag Archives: wind

Earth Day, Sustainable Energy

A ‘100% renewables’ target might not mean what you think it means. An energy expert explains

In the global effort to transition from fossil fuels to clean energy, achieving a “100% renewables” electricity system is considered ideal.

Some Australian states have committed to 100% renewable energy targets, or even 200% renewable energy targets. But this doesn’t mean their electricity is, or will be, emissions free.

Electricity is responsible for a third of Australia’s emissions, and making it cleaner is a key way to reduce emissions in other sectors that rely on it, such as transport.

So it’s important we have clarity about where our electricity comes from, and how emissions-intensive it is. Let’s look at what 100% renewables actually implies in detail.

Is 100% renewables realistic?

Achieving 100% renewables is one way of eliminating emissions from the electricity sector.

It’s commonly interpreted to mean all electricity must be generated from renewable sources. These sources usually include solar, wind, hydro, and geothermal, and exclude nuclear energy and fossil fuels with carbon capture and storage.

But this is a very difficult feat for individual states and territories to try to achieve.

The term “net 100% renewables” more accurately describes what some jurisdictions — such as South Australia and the ACT — are targeting, whether or not they’ve explicitly said so.

These targets don’t require that all electricity people use within the jurisdiction come from renewable sources. Some might come from coal or gas-fired generation, but the government offsets this amount by making or buying an equivalent amount of renewable electricity.

A net 100% renewables target allows a state to spruik its green credentials without needing to worry about the reliability implications of being totally self-reliant on renewable power.

So how does ‘net’ 100% renewables work?

All east coast states are connected to the National Electricity Market (NEM) — a system that allows electricity to be generated, used and shared across borders. This means individual states can achieve “net 100% renewables” without the renewable generation needing to occur when or where the electricity is required.

Take the ACT, for example, which has used net 100% renewable electricity since October 2019.

The ACT government buys renewable energy from generators outside the territory, which is then mostly used in other states, such as Victoria and South Australia. Meanwhile, people living in ACT rely on power from NSW that’s not emissions-free, because it largely comes from coal-fired power stations.

This way, the ACT government can claim net 100% renewables because it’s offsetting the non-renewable energy its residents use with the clean energy it’s paid for elsewhere.

SA’s target is to reach net 100% renewables by the 2030s. Unlike the ACT, it plans to generate renewable electricity locally, equal to 100% of its annual demand.

At times, such as especially sunny days, some of that electricity will be exported to other states. At other times, such as when the wind drops off, SA may need to rely on electricity imports from other states, which probably won’t come from all-renewable sources.

So what happens if all states commit to net 100% renewable energy targets? Then, the National Electricity Market will have a de-facto 100% renewable energy target — no “net”.

That’s because the market is one entire system, so its only options are “100% renewables” (implying zero emissions), or “less than 100% renewables”. The “net” factor doesn’t come into it, because there’s no other part of the grid for it to buy from or sell to.

How do you get to “200% renewables”, or more?

It’s mathematically impossible for more than 100% of the electricity used in the NEM to come from renewable sources: 100% is the limit.

Any target of more than 100% renewables is a different calculation. The target is no longer a measure of renewable generation versus all generation, but renewable generation versus today’s demand.

Australia could generate several times more renewable energy than there is demand today, but still use a small and declining amount of fossil fuels during rare weather events. Shutterstock

Tasmania, for example, has legislated a target of 200% renewable energy by 2040. This means it wants to produce twice as much renewable electricity as it consumes today.

But this doesn’t necessarily imply all electricity consumed in Tasmania will be renewable. For example, it may continue to import some non-renewable power from Victoria at times, such as during droughts when Tasmania’s hydro dams are constrained. It may even need to burn a small amount of gas as a backup.

This means the 200% renewable energy target is really a “net 200% renewables” target.

Meanwhile, the Greens are campaigning for 700% renewables. This, too, is based on today’s electricity demand.

In the future, demand could be much higher due to electrifying our transport, switching appliances from gas to electricity, and potentially exporting energy-intensive, renewable commodities such as green hydrogen or ammonia.

Targeting net-zero emissions

These “more than 100% renewables” targets set by individual jurisdictions don’t necessarily imply all electricity Australians use will be emissions free.

It’s possible — and potentially more economical — that we would meet almost all of this additional future demand with renewable energy, but keep some gas or diesel capacity as a low-cost backstop.

This would ensure continued electricity supply during rare, sustained periods of low wind, low sun, and high demand, such as during a cloudy, windless week in winter.

The energy transition is harder near the end — each percentage point between 90% and 100% renewables is more expensive to achieve than the previous.

That’s why, in a recent report from the Grattan Institute, we recommended governments pursue net-zero emissions in the electricity sector first, rather than setting 100% renewables targets today.

For example, buying carbon credits to offset the small amount of emissions produced in a 90% renewable NEM is likely to be cheaper in the medium term than building enough energy storage — such as batteries or pumped hydro dams — to backup wind and solar at all times.

The bottom line is governments and companies must say what they mean and mean what they say when announcing targets. It’s the responsibility of media and pundits to take care when interpreting them.

This article is by James Ha, Associate, Grattan Institute and republished from The Conversation under a Creative Commons license. Read the original article.

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Climate Solutions, News, Observation

Offshore wind farms could help capture carbon from air and store it long-term – using energy that would otherwise go to waste

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Off the Massachusetts and New York coasts, developers are preparing to build the United States’ first federally approved utility-scale offshore wind farms – 74 turbines in all that could power 470,000 homes. More than a dozen other offshore wind projects are awaiting approval along the Eastern Seaboard.

By 2030, the Biden administration’s goal is to have 30 gigawatts of offshore wind energy flowing, enough to power more than 10 million homes.

Replacing fossil fuel-based energy with clean energy like wind power is essential to holding off the worsening effects of climate change. But that transition isn’t happening fast enough to stop global warming. Human activities have pumped so much carbon dioxide into the atmosphere that we will also have to remove carbon dioxide from the air and lock it away permanently.

Offshore wind farms are uniquely positioned to do both – and save money.

Most renewable energy lease areas off the Atlantic Coast are near the Mid-Atlantic states and Massachusetts. About 480,000 acres of the New York Bight is scheduled to be auctioned for wind farms in February 2022. BOEM

As a marine geophysicist, I have been exploring the potential for pairing wind turbines with technology that captures carbon dioxide directly from the air and stores it in natural reservoirs under the ocean. Built together, these technologies could reduce the energy costs of carbon capture and minimize the need for onshore pipelines, reducing impacts on the environment.

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Capturing CO2 from the air

Several research groups and tech startups are testing direct air capture devices that can pull carbon dioxide directly from the atmosphere. The technology works, but the early projects so far are expensive and energy intensive.

The systems use filters or liquid solutions that capture CO2 from air blown across them. Once the filters are full, electricity and heat are needed to release the carbon dioxide and restart the capture cycle.

For the process to achieve net negative emissions, the energy source must be carbon-free.

The world’s largest active direct air capture plant operating today does this by using waste heat and renewable energy. The plant, in Iceland, then pumps its captured carbon dioxide into the underlying basalt rock, where the CO2 reacts with the basalt and calcifies, turning to solid mineral.

A similar process could be created with offshore wind turbines.

If direct air capture systems were built alongside offshore wind turbines, they would have an immediate source of clean energy from excess wind power and could pipe captured carbon dioxide directly to storage beneath the sea floor below, reducing the need for extensive pipeline systems.

Researchers are currently studying how these systems function under marine conditions. Direct air capture is only beginning to be deployed on land, and the technology likely would have to be modified for the harsh ocean environment. But planning should start now so wind power projects are positioned to take advantage of carbon storage sites and designed so the platforms, sub-sea infrastructure and cabled networks can be shared.

Using excess wind power when it isn’t needed

By nature, wind energy is intermittent. Demand for energy also varies. When the wind can produce more power than is needed, production is curtailed and electricity that could be used is lost.

That unused power could instead be used to remove carbon from the air and lock it away.

For example, New York State’s goal is to have 9 gigawatts of offshore wind power by 2035. Those 9 gigawatts would be expected to deliver 27.5 terawatt-hours of electricity per year.

Based on historical wind curtailment rates in the U.S., a surplus of 825 megawatt-hours of electrical energy per year may be expected as offshore wind farms expand to meet this goal. Assuming direct air capture’s efficiency continues to improve and reaches commercial targets, this surplus energy could be used to capture and store upwards of 0.5 million tons of CO2 per year.

That’s if the system only used surplus energy that would have gone to waste. If it used more wind power, its carbon capture and storage potential would increase.

Several Mid-Atlantic areas being leased for offshore wind farms also have potential for carbon storage beneath the seafloor. The capacity is measured in millions of metric tons of CO2 per square kilometer. The U.S. produces about 4.5 billion metric tons of CO2 from energy per year. U.S. Department of Energy and Battelle

The Intergovernmental Panel on Climate Change has projected that 100 to 1,000 gigatons of carbon dioxide will have to be removed from the atmosphere over the century to keep global warming under 1.5 degrees Celsius (2.7 Fahrenheit) compared to pre-industrial levels.

Researchers have estimated that sub-seafloor geological formations adjacent to the offshore wind developments planned on the U.S. East Coast have the capacity to store more than 500 gigatons of CO2. Basalt rocks are likely to exist in a string of buried basins across this area too, adding even more storage capacity and enabling CO2 to react with the basalt and solidify over time, though geotechnical surveys have not yet tested these deposits.

Planning both at once saves time and cost

New wind farms built with direct air capture could deliver renewable power to the grid and provide surplus power for carbon capture and storage, optimizing this massive investment for a direct climate benefit.

But it will require planning that starts well in advance of construction. Launching the marine geophysical surveys, environmental monitoring requirements and approval processes for both wind power and storage together can save time, avoid conflicts and improve environmental stewardship.

Originally published on The Conversation by David Goldberg, Lamont Research Professor, Columbia University and republished under a Creative Commons license. Read the original article.

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News, Politics

Biden bets a million barrels a day will drive down soaring gas prices – what you need to know about the Strategic Petroleum Reserve

Several sites, such as one near Freeport, Texas, store the hundreds of million of barrels in the United States’ Strategic Petroleum Reserve. Department of Energy via AP

Scott L. Montgomery, University of Washington

The Biden administration on March 31, 2022, said it plans to release an unprecedented 180 million barrels of oil from the U.S. Strategic Petroleum Reserve to combat the recent spike in gas and diesel prices. About a million barrels of oil will be released every day for up to six months.

If all the oil is released, it would represent almost one-third of the current volume of the Strategic Petroleum Reserve. It follows a release of 30 million barrels in early March, a large withdrawal until the latest one.

But what is the Strategic Petroleum Reserve, why was it created, and when has it been used? And does it still serve a purpose, given that the U.S. exports more oil and other petroleum products than it imports?

As an energy researcher, I believe considering the reserve’s history can help answer these questions.

Origins of the reserve

Congress created the Strategic Petroleum Reserve as part of the Energy Policy and Conservation Act of 1975 in response to a global oil crisis.

Arab oil-exporting states led by Saudi Arabia had cut supply to the world market because of Western support for Israel in the 1973 Yom Kippur War. Oil prices quadrupled, resulting in major economic damage to the U.S. and other countries. This also shook the average American, who had grown used to cheap oil.

The oil crisis caused the U.S., Japan and 15 other advanced countries to form the International Energy Agency in 1974 to recommend policies that would forestall such events in the future. One of the agency’s key ideas was to create emergency petroleum reserves that could be drawn on in case of a severe supply disruption.

The map shows the locations of the oil held in the Strategic Petroleum Reserve. Department of Energy

The Energy Policy and Conservation Act originally stipulated the reserve should hold up to 1 billion barrels of crude and refined petroleum products. Though it has never reached that size, the U.S. reserve is the largest in the world, with a maximum volume of 714 million barrels. The cap was previously set at 727 million barrels.

As of March 25, 2022, the reserve contained about 568 million barrels.

Oil in the reserve is stored underground in a series of large underground salt domes in four locations along the Gulf Coast of Texas and Louisiana, and is linked to major supply pipelines in the region.

Salt domes, formed when a mass of salt is forced upward, are a good choice for storage since salt is impermeable and has low solubility in crude oil. Most of the storage sites were acquired by the federal government in 1977 and became fully operational in the 1980s.

History of drawdowns

In the 1975 act, Congress specified that the reserve was intended to prevent “severe supply interruptions” – that is, actual oil shortages.

Over time, as the oil market has changed, Congress expanded the list of reasons for which the Strategic Petroleum Reserve could be tapped, such as domestic supply interruptions due to extreme weather.

Prior to March 2022, about 280 million barrels of crude oil had been released since the reserve’s creation, including a 50 million release that began in November 2021.

There have only been three emergency releases in the reserve’s history. The first was in 1991 after Iraq invaded Kuwait the year before, which resulted in a sharp drop in oil supply to the world market. The U.S. released 34 million barrels.

The second release, of 30 million barrels, came in 2005 after Hurricanes Rita and Katrina knocked out Gulf of Mexico production, which then comprised about 25% of U.S. domestic supply.

The third was a coordinated release by the International Energy Agency in 2011 as a result of supply disruptions from several oil-producing countries, including Libya, then facing civil unrest during the Arab Spring. In all, the agency coordinated a release of 60 million barrels of crude, half of which came from the U.S.

In addition, there have been 11 planned sales of oil from the reserve, mainly to generate federal revenue. One of these – the 1996-1997 sale to reduce the federal budget deficit – seemed to serve political ends rather than supply-related ones.

A better way to avoid pain at the pump

President Joe Biden’s November decision to tap the reserve was also seen as political by Republicans because there was no emergency shortage of supply at that time.

Similarly, the latest historic release of 180 million barrels could also be seen as serving a political purpose – in an election year, no less. But I believe it also seems perfectly legitimate in terms of fulfilling the Strategic Petroleum Reserve’s original purpose: reducing the negative impacts of a major oil price shock.

Though the U.S. is today a net petroleum exporter, it continues to import as much as 8.2 million barrels of crude oil every day.

[Over 150,000 readers rely on The Conversation’s newsletters to understand the world. Sign up today.]

But in my view, the best way to avoid the pain of oil price shocks is to lower oil demand by reducing global carbon emissions – rather than mainly relying on releases from the reserve.

This is an updated version of an article originally published on Nov. 24, 2021.

Scott L. Montgomery, Lecturer, Jackson School of International Studies, University of Washington

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Climate Solutions, News

Ida Wreaks Havoc on the East Coast while Hurricane Larry Looms on Horizon

Above: Photo Credit / Lynxotic-Adobe Stock

Extreme Weather Accelerates in Frequency and Destructive Power

Ida hit Louisiana with extreme force, causing damage and mayhem, and leaving hundreds of thousands without power earlier this week. The remnants of that destruction have now moved Northeast. Next, Hurricane Larry is expected to become a major storm by Friday according to the National Hurricane Center.

Effects of Hurricane Ida unloaded in the New York City metro area, creating, unprecedented extreme rainfall. So much so that for the first time ever, a “flash flood emergency” was initiated and both New York Mayor Bill de Blasio and New Jersey Governor Phil Murphy declared states of emergency starting late Wednesday. 

“This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!,” the National Weather Service wrote. And example of the extreme nature of the deluge comes via the stat that Central Park got more rain in one hour than it normally would in the entire month of September. More than 2.5 times the previous highest count even, which was tallied just recently.

Parts of New York City and the Tri-State, covering a population of where near 9 million people reside have been affected. Roads flooded, transforming the paths to looks more like raging rivers and rendering subways, cars, and basements of homes useless. 

At least 9 people have been reported dead as a result of storm. 

Images posted throughout social media overnight showed the insane amount of watering surging over roads as public transportations attempt to navigate and cars get stuck in the water. Even a frightening video of tornado happening in real time in Mullica Hill, New Jersey. 

All too familiar the Elephant in the room needs acknowledgment

Although barely mentioned in the midst of chaos and people desperately trying to get to work on Thursday, climate change is giving a kind of early warning signal via extreme weather evens like this, as well as influencing the severity of the massive drought worsening daily in the west, immense wildfires and natural disasters that are being seen with unprecedented frequency and intensity.

If there was ever a wake up call to change and respond with speed and action, this is it.

On twitter there was a thread that likened the photos and videos to the prescient sci-fi film “The Day After Tomorrow” which depicted an ice-age occurring as a result of climate change, and also had scenes of massive flooding (due to the sea level rising which is currently happening, day by day).

The comparison is a stark one, with the Hollywood generated special effects stills not nearly as chilling as the current reality showed in photos being shared and tweeted.

There’s an all too familiar thread building here – larger more intense and devastating events that many keep saying are a coincidence or “random”. I think any child can see (@gretathunberg ?) that there is zero chance anymore that coincidence plays any more that a minuscule role in these tragedies growing, expanding and increasing exponentially.

Unfortunately, we can expect more of the same, no only here in this country, as mentioned above with Larry queuing up of shore, but around the world with extreme and dangerous droughts, heatwaves, polar vortex episodes, floods, deadly wildfires and more becoming the “norm”.

The time to recognize the origin of these mounting calamities has passed, but any proactive, powerful response by governments and industry has barely begun. Perhaps the images and tragedies now being documented and shared (such as below) can help to harden our resolve to see that a change, toward the drastic measures required to combat this climate emergency will finally begin in earnest.

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Hot-Lynx

Article from 1912 linked Coal to Climate Change

Above: Photo Collage / Lynxotic

We were given a warning about fossil fuels. Now we’re living it…

An image from an old newspaper was shared on social media from the account “Historical Photos” and titled “Coal Consumption Affecting Climate”.

The image of the clipping went viral very likely because of the amazing date it was published on, August 14th, 1912. The image has since been seen by over 17k people on Twitter and over 6k on Facebook.

Understandably there were many people that questioned whether the article was actually authentic or merely fabricated. The implication is a big one, that scientists have known for over a century the negative impacts coal consumption has on the climate (and haven’t done much to change it).

https://twitter.com/Iearnhistory/status/1425673866609762306?s=20

As per USA Today, the article is, in fact, real and has been authenticated by Snopes. The text originated from a March 1912 report in the Popular Mechanics magazine titled “Remarkable Weather of 1911: The Effect of the Combustion of Coal on the Climate – What Scientists Predict for the Future.” Similar phrasing was used in the New Zealand newspaper published on August 14, 1912 which is from the viral image.

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