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Tag: Hydropower

  • Exclusive: One startup’s quest to store electricity in the ocean | TechCrunch

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    When Manuele Aufiero was a child, his parents would take him hiking along a reservoir in northern Italy. It wasn’t a typical reservoir, though. This one drained and refilled constantly, with pumps raising the water level when electricity was cheap. When nearby cities needed electricity, the pumps would reverse, turning into generators as the water drained out of the reservoir.

    The technology, known as pumped-storage hydropower, or pumped hydro for short, has been around for over a century. Such facilities are some of the biggest “batteries” humans have ever built. Globally, pumped hydro reservoirs store 8,500 gigawatt-hours of electricity, according to the International Energy Agency.

    Pumped hydro can generate electricity for hours on end, and the power plants have grown in importance as intermittent energy sources like wind and solar have become more widespread. But there are only so many places on Earth with suitable topography to host a pumped hydro reservoir.

    “I’m in love with pumped hydro,” Aufiero told TechCrunch. “It’s just not enough to keep up with renewables.”

    So Aufiero decided to solve that problem by moving the technology to the sea. He co-founded a startup, Sizable Energy, to turn his idea into reality.

    Sizable recently raised $8 million in a funding round led by Playground Global with participation from EDEN/IAG, Exa Ventures, Satgana, Unruly Capital, and Verve Ventures, the company exclusively told TechCrunch.

    The startup’s power plant looks something like an hourglass. Sizable’s concept specifies two sealed, flexible reservoirs, one that floats at the top and another that sits at the bottom on the seabed. They’re connected by a plastic tube and some turbines.

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    When power is cheap, the turbines will pump super salty water from the bottom reservoir to the top. When the grid needs energy, Sizable will open a valve, and because the water in the reservoir contains more salt than the surrounding seawater, it’s heavier and will fall down to the lower reservoir. As it flows through the pipe, it spins the turbines, which act as generators.

    “From the energy balance point of view, what we are doing is lifting block of salt. But instead of using cranes, we dissolve it and pump it just because it’s easier, simpler,” Aufiero said. “Other than that, we are just lifting a heavy amount of salt.”

    By moving pumped hydro to the ocean, Sizable is hoping to mass produce the technology, something that isn’t really possible on land.

    “Every time you build pumped hydro on shore, you have to design a concrete dam for that specific site, and you have to adapt the technology there,” Aufiero said. “Building offshore allows us to streamline the production, and everything we do is identical, regardless of the final deployment site.”

    Sizable has tested a small model of the reservoirs in wave tanks and off the coast of Reggio Calabria, Italy. It’s now deploying a pilot of the floating components in advance of a full demonstration plant. By 2026, it’s hoping to deploy several commercial projects at sites around the world. 

    At full size, the turbines would generate around 6 to 7 megawatts of electricity each, and there will be one for every 100 meters of pipe. Deeper sites would have more storage potential, and each commercial site would host multiple reservoirs. Sizable hopes to deliver energy storage for €20 per kilowatt-hour (about $23), about one-tenth what a grid-scale battery costs.

    The technology would pair well with offshore wind projects since sharing an electrical connection to the shore would reduce costs. But Aufiero said that Sizable’s reservoirs could connect to any grid that’s near waters that are at least 500 meters (1,640 feet) deep.

    “We believe that long duration energy storage is required not only for renewable integration, but also for just making the grid resilient,” he said. “There is no way we can keep up with that with traditional pumped hydro or batteries. We need something new.”

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    Tim De Chant

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  • Wet summer grants big cities in hydro-powered Norway 2 days of free electricity

    Wet summer grants big cities in hydro-powered Norway 2 days of free electricity

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    Oslo — Electricity was free in Norway’s two biggest cities on Monday, market data showed, the silver lining of a wet summer. With power almost exclusively produced from hydro in Norway, the more it rains or snows, the more the reservoirs fill up and the lower the electricity price.

    A particularly violent summer storm dubbed “Hans” that swept across Scandinavia in August, in addition to frequent rainfall this summer, have filled reservoirs in parts of Norway.

    TOPSHOT-NORWAY-WEATHER-FLOOD
    Water flows over a dam at the Braskereidfoss Power plant in Norway, August 9, 2023.

    CORNELIUS POPPE/NTB/AFP/Getty


    As a result, the spot price of electricity before taxes and grid fees was expected to hover between 0 and -0.3 kroner (-0.03 U.S. cents) on Monday in the capital Oslo and the second biggest city, Bergen, according to specialized news site Europower.

    On Nord Pool, Europe’s leading power market, wholesale electricity prices in the two cities on Monday averaged -1.42 euros per megawatt hour. A negative price means electricity companies pay consumers to use their production.

    “(Electricity) producers have explained in the past that it is better to produce when prices are a little bit negative rather than take measures to stop production,” Europower said.

    Even though the spot price was slightly in the red in some parts of the country — which is divided into various price zones — companies are still able to make money from green electricity certificates.

    According to climate experts, global warming is leading to more frequent and more intense rainfall and snowfall in northern Europe.


    Climate change’s role in the extreme weather around the world

    04:51

    Last week, the Norwegian Meteorological Institute said temperatures in August in Norway were an average of 0.9 degrees Celsius (or a little less than 2 degrees Fahrenheit) higher than usual, and that after an already rainy July, precipitation in August was 45% higher than usual.

    “All this rain, including ‘Hans’, contains an element of climate change,” researcher Anita Verpe Dyrrdal said.

    One weather station in southern Norway registered 392.7 millimeters (about 15.5 inches) of rain in August, 257% more than usual.

    According to Europower, this is the second time electricity prices have gone negative in parts of Norway. The first time was on August 8 in the wake of storm “Hans.”

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  • Ukraine accuses Russia of ‘ecocide’ as critical dam near Kherson destroyed sparking evacuations | CNN

    Ukraine accuses Russia of ‘ecocide’ as critical dam near Kherson destroyed sparking evacuations | CNN

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    CNN
     — 

    A major dam in Russian-occupied southern Ukraine was destroyed early Tuesday, prompting mass evacuations and fears for large-scale devastation as Ukraine accused Moscow’s forces of committing an act of “ecocide.”

    Residents downstream from the Nova Kakhova dam on the Dnipro River in Kherson were told to “do everything you can to save your life,” according to the head of Ukraine’s Kherson region military administration, as video showed a deluge of water gushing from a huge breach in the dam.

    Two videos posted to social media and geolocated by CNN showed the destroyed dam wall and fast-moving torrents of water flowing out into the river. Multiple buildings at the entrance to the dam were also heavily damaged.

    The critical Nova Kakhova dam spans the Dnipro River, a major waterway running through southeastern Ukraine and there are multiple towns and cities downstream, including Kherson, a city of some 300,000 people before Moscow’s invasion of its neighbor.

    Ukraine’s Operational Command South on Tuesday confirmed the dam’s destruction in a post on its official Facebook page, saying they were assessing the scale of the damage and calculating likely areas of flooding.

    Following the dam breach, Ukrainian President Volodymyr Zelensky said its destruction “only confirms for the whole world” that Russian forces “must be expelled from every corner of Ukrainian land.”

    He also convened an emergency meeting of the National Security and Defense Council of Ukraine.

    Other senior Ukrainian officials blamed Russia.

    “This is ecocide,” Andriy Yermak, the head of the Office of the President of Ukraine, said of the dam’s destruction.

    “The Russians will be responsible for the possible deprivation of drinking water for people in the south of Kherson region and in Crimea, the possible destruction of some settlements and the biosphere,” he added.

    In a video statement posted on Telegram, Oleksandr Prokudin, the Ukraine-appointed head of the Kherson region military administration, said the water “will reach critical level in five hours.”

    “The Russian Army has committed another act of terror. It has blown up Kakhovka Hydro Power Plant… Evacuation in the area of danger has started,” he said.

    Prokudin said evacuations in the “area of danger” around the dam had started and asked citizens to “collect your documents and most needed belongings and wait for evacuation buses.”

    “I ask you to do everything you can to save your life. Leave the dangerous areas immediately,” he added.

    Units of Ukraine’s National Police and the state emergency service of the Kherson region have been put on alert to warn and evacuate civilians from potential flood zones, Ukraine’s Ministry of Internal Affairs said.

    Those zones are on the west bank of the Dnipro River, including “the villages of Mykolaivka, Olhivka, Liovo, Tiahynka, Poniativka, Ivanivka, Tokarivka, Poniativka, Prydniprovske, Sadove, and part of the city of Kherson – Korabel Island,” the ministry said.

    With the water level rising, authorities urged everyone in the flood zone to turn off all electrical appliances, take documents and essentials, take care of loved ones and pets, and follow the instructions of rescuers and police.

    The Russian-installed mayor of Nova Kakhovka, Vladimir Leontiev, initially on Tuesday denied information about the dam collapsing in an interview with Russian state media RIA Novosti, calling it “nonsense.”

    He later confirmed the destruction of parts of the dam in what he called “a serious terrorist act” but said there was “no need to evacuate.”

    “Overnight strikes on the Kakhovka hydroelectric power plant destroyed gate valves, causing water to be spilled downstream uncontrollably,” Leontyev said.

    CNN was not immediately able to verify the claims made by Ukrainian and Russian officials attributing blame.

    Throughout the course of the war in Ukraine both Moscow and Kyiv have accused each other of plotting to blow up the Soviet-era dam.

    The escaping torrent of water has the potential to cause major destruction around Kherson city and other populated areas along the Dnipro River, according to analysts who have been fearing a breach could occur in the fighting.

    And President Zelensky had previously warned that a breach of the dam could have catastrophic consequences for those living downstream.

    “Destroying the dam would mean a large-scale disaster,” he said in October last year.

    However, a Russian-installed Kherson official Andrey Alekseenko said the situation along the areas of the banks of Dnipro was “under control.”

    “There is no threat to people’s lives,” Alekseenko said, adding that Ministry of Emergency Situation staff are in control of water levels in the river.

    “If necessary, we are ready to evacuate the residents of embankment villages, buses are prepared,” Alekseenko added.

    The dam is a critical piece of infrastructure, holding around 18 cubic kilometers in the Kakhovka Reservoir, about equal to the Great Salt Lake in the US state of Utah, according to Reuters news agency.

    The 30-meter-high, 3.2-kilometer (2 miles)-long structure is one of six dams along the Dnipro and supplies water for much of southeastern Ukraine and the Crimean peninsula which was annexed by Russia in 2014.

    It also supplies water for the Zaporizhzhia nuclear plant, which lies upstream and is also under Russian control.

    On Tuesday, a spokeswoman for Ukraine’s southern command said the dam’s destruction will “certainly” affect the operation of the nuclear power plant but there was “no need to escalate the situation now and draw the most critical conclusions.”

    “Because all experts are involved and will try to create better conditions to avoid the next technogenic catastrophe,” said Natalia Humeniuk, adding that “the situation is currently under control.”

    And the International Atomic Energy agency said “no immediate nuclear safety risk” exists at the Zaporizhzhia plant and their experts are “closely monitoring the situation.”

    In November, the Nova Kakhovka dam was damaged in shelling and satellite images from Maxar Technologies obtained by CNN showed water flowing out of three sluice gates at the dam.

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  • Sazmining Launches Hydroelectric-Powered Mining Facility In Wisconsin

    Sazmining Launches Hydroelectric-Powered Mining Facility In Wisconsin

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    Sazmining, a bitcoin mining hosting solution provider, has launched their first hydroelectric-powered mining facility in Wisconsin, providing the company with a carbon-neutral source of electricity.

    According to a press release sent to Bitcoin Magazine, the facility will house 350 mining rigs. These will be powered by the natural flow of a nearby river running through a man-made dam.

    The release describes how “This is a definitive proof-of-concept to show that, when done responsibly, bitcoin mining can not only greatly minimize any potential impact on the environment, but can also be fully carbon-neutral.” Bitcoin mining’s environmental impact has come under fire from many critics, but there is an incredible volume of research that shows Bitcoin mining encourages investment into renewables and sustainable sources of energy.

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    BtcCasey

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  • Renewable energy usage has doubled in the last decade. Hawaii is leading the charge.

    Renewable energy usage has doubled in the last decade. Hawaii is leading the charge.

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    Renewable energy is on the rise. 

    According to the U.S. Energy Information Agency, renewable sources of energy like hydropower, wind and solar will account for 24% of the nation’s energy supply in 2023, more than double what it was a decade ago.

    The number is being driven by an increase in generating capacity from wind and solar and the retirement of coal and nuclear plants — and a dramatic drop in prices in recent years. 

    While big states like California, Texas and Washington lead the way on total renewable energy generation, one small state has been leading in a different way.

    In 2015, Hawaii became the first state to pass a law saying all electricity would come from renewable sources by 2045.

    Jeff Mikulina is an environmentalist in Hawaii who pushed for the clean energy standard. Initially, the idea was not well received.

    “The governor at the time called me Harry Potter, which I thought was a bit of an honor. We kept on pushing,” Mikulina said.

    Why Harry Potter?

    “He said it was magical thinking,” Mikulina said.

    Since then, Hawaii’s electricity mix has undergone significant changes.

    For example, in 2013, the state got less than 1% of its electricity from solar. By 2021 that number grew to 17.5%. While 5.1% of that comes from solar farms, 12.4% comes from things like rooftop solar, on private homes.

    “It’s been fantastic that the adoption of rooftop solar over the last 10 or 15 years in Hawaii,” Mikulina said. “Now we have nearly 100,000 mini power plants on people’s rooftops statewide,” he added.

    The progress toward 100% renewal energy in Hawaii is ahead of schedule and has led to other noticeable changes like the closure of the state’s last remaining coal plant in 2022.

    But the state is still heavily reliant on oil imported from places like Libya and until recently Russia, the cost of electricity has also gone up and many of the easier steps have already been taken.

    Mikulina says it’s worth the continued effort.

    “The bottom line is we need to get off fossil fuel as fast as possible. And it’s not a question of, can we achieve it? It’s a moral question that we must,” Mikulina said. 


    “On the Dot” web extra: Mauna Loa Observatory

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