"Made In Space, Redwire, and Bigelow, move over," writes long-time Slashdot reader Dr. Crash. "There's yet another 3D printing in space group — and it's not a startup." Mitsubishi Electric just went public with a UV-sensitive resin specially made to print in zero-G and in a hard vacuum — as in outside the airlock.

The polymer is tuned to harden with solar ultraviolet light, so no UV lasers needed (saving power and launch weight).

Their first goal? Printing cubesat parabolic dishes in orbit, so a 300mm cubesat could have what looks like a one-meter dish antenna — or anything else that can be freeform-printed.
This "photopolymerization" technology "specifically addresses the challenge of equipping small, inexpensive spacecraft buses with large structures, such as high-gain antenna reflectors," according to Mitsubishi's announcement — arguing that it also ultimately "enables on-orbit fabrication of structures that greatly exceed the dimensions of launch vehicle fairings."

System76's CEO Carl Richell announced that HP has chosen the Ubuntu-based Pop!_OS operating system to run on its 14-inch developer-focused notebook called "Dev One." Brian Fagioli from BetaNews speculates that a HP acquisition of System76 "could be a possibility in the future -- if this new relationship pans out at least." He continues: HP could be testing the waters with the upcoming Dev One. Keep in mind, System76 does not even build its own laptops, so we could see the company leave the notebook business and focus on desktops only -- let HP handle the Pop!_OS laptops. "We've got you covered. Experience exceptional multi-core performance from the AMD Ryzen 7 PRO processor and multitask with ease. Compile code, run a build, and keep all your apps running with more speed from the 16GB memory. Plus, load and save files in a flash, thanks to 1TB fast PCIe NVMe M.2 storage. We've even added a Linux Super key so shortcuts are a click away. Simply put, HP Dev One is built to help you code better," explains HP.

The company adds, "Pop!_OS is at your service. Create your ideal work experience with multiple tools to help you perform with peak efficiency. Use Stacking to organize and access multiple applications, browsers, and terminal windows. Move, resize, and arrange windows with ease or, let Pop!_OS keep you organized and efficient with Auto-tiling. And use Workspaces to reduce clutter by organizing windows across multiple desktops." Apparently, there will only be one configuration priced at $1,099. So far, no details about a release date have been announced other than "coming soon."

iFixit CEO Kyle Wiens sat down with Ars Technica to discuss the fight for the right to repair. Here's an excerpt from their report: Tech repairs got complicated in 1998 when Congress passed the Digital Millennium Copyright Act [PDF]. Section 1201 of the copyright law essentially made it illegal to distribute tools for, or to break encryption on, manufactured products. Created with DVD piracy in mind, it made fixing things like computers and tractors significantly harder, if not illegal, without manufacturer permission. It also represented "a total sea change from what historic property rights have been," Wiens said. This makes Washington, DC, the primary battleground for the fight for the right to repair. "Because this law was passed at the federal level, the states can't preempt. Congress at the federal level reset copyright policy. This fix has to happen at the US federal level," Wiens told Ars Technica during the Road to Frontiers talk.

The good news is that every three years, the US Copyright Office holds hearings to discuss potential exemptions. Right to repair advocates are hoping Congress will schedule this year's hearing soon. Wiens also highlighted the passing of the Freedom to Repair Act [PDF] introduced earlier this year as critical for addressing Section 1201 and creating a permanent exemption for repairing tech products.

Apple's self-service repair program launched last month marked a huge step forward for the right to repair initiated by a company that has shown long-standing resistance. Wiens applauded the program, which provides repair manuals for the iPhone 12, 13, and newest SE and will eventually extend to computers. He emphasized how hard it is for iFixit to reverse-engineer such products to determine important repair details, like whether a specific screw is 1 or 1.1 mm. [...]

Wiens envisioned a world where gadgets not only last longer but where you may also build relationships with local businesses to keep your products functioning. He lamented the loss of businesses like local camera and TV repair shops extinguished by vendors no longer supplying parts and tools. [...] He also discussed the idea of giving gadgets second and even third lives: An aged smartphone could become a baby monitor or a smart thermostat. "I think we should be talking about lifespans of smartphones in terms of 20, 25 years," Wiens said. The livestream of the discussion can be viewed here.

Citing a report from The Information's Wayne Ma (paywalled), MacRumors reports Apple's long-rumored AR/VR headset is said to feature 14 cameras that enable lifelike avatars with accurate facial expressions. The company is also working with former design chief Jony Ive on the project. From the report: For starters, one of the headset's marquee features is said to be lifelike avatars with accurate facial expressions captured by 14 cameras: "Other challenges, such as incorporating 14 cameras on the headset, have caused headaches for hardware and algorithm engineers. The cameras include those that will track the user's face to ensure virtual avatars accurately represent their expressions and mouth movements, a marquee feature."

The report adds that Apple's former design chief Jony Ive has remained involved with the headset project as an external consultant to the company: "One person familiar with the matter said Ive's consulting work for Apple since he left includes the headset, adding that he is often brought in to help his former team push through their preferences in areas such as battery, camera placement and ergonomics over those of engineers. Two people said even after Ive left Apple, some employees on the headset project were still required to make the trek from Cupertino to San Francisco, where Ive has a home, to get his approval on changes. Ive has continued to tweak the headset's design. While earlier prototypes had the battery in the headband, he prefers a design that would tether the headset to a battery the user wears, similar to Magic Leap's headset design. It couldn't be learned if this approach will make it into the final design."

The initial version of Apple's headset is said to lack a focus on gaming: "Four people who have worked on the project also criticized its lack of focus on gaming, a category of software that appeals to early adopters, which was important to the success of the iPhone and has been a big priority for Meta's VR group. Those people said Rockwell's group almost never mentioned games in internal presentations about possible uses for the headset. Apple isn't developing game controllers for the device and is aiming to use hand tracking or in combination with a clothespin-like finger clip as inputs for the device, multiple people familiar with the project say." On Thursday, Bloomberg reported that Apple executives previewed the upcoming headset to the company's board last week, "indicating that development of the device has reached an advanced stage."

An anonymous reader quotes a report from Ars Technica: One of the best things about electric cars, other than their power trains, immediate torque, and relaxing quiet, is the fact that as the electrical grid becomes cleaner, so too does every EV that uses that grid to charge. That process took a step forward this week with the news that by next year, the Electrify America (EA) charging network will be entirely offset by solar energy.

On Wednesday, EA signed a 15-year agreement with Terra-Gen to purchase electricity from a 75 MW solar farm being built by the latter in San Bernardino County, California. The Electrify America Solar Glow 1 project will break ground later this year, and when it's fully operational in 2023, it should have an annual energy production of 225,000 MWh. That's more than enough to account for the annual energy use of the EA charging network. In fact, EA says that as of April, its electricity is already 100 percent renewable thanks to purchases from various suppliers, but with the commissioning of Solar Glow 1, the charging company should have complete confidence that it's putting more solar energy into the grid than it uses to charge our cars.

An anonymous reader quotes a report from Ars Technica: An upgradeable laptop is only worthwhile if you can actually upgrade it [...], and Framework is making that possible starting today: The company is introducing a new iteration of the Framework Laptop's motherboard that uses 12th-gen Intel CPUs. A brand-new 12th-gen Framework Laptop starts at $1,049 for a Core i5-equipped base model, or $819 for a build-it-yourself kit with no memory or storage. These products will be available for preorder starting today, and shipping will start in July.

The 12th-generation Core processors use Intel's latest Alder Lake CPU architecture, which combines high-performance P-cores and high-efficiency E-cores to maximize performance under heavy load and reduce power usage when your computer is mostly idle. The base Core i5-1240P CPU includes four P-cores and eight E-cores, a big boost in core count compared to the quad-core 11th-gen CPUs. The Core i7-1260P upgrade has the same CPU core count with boosted clock speeds and a small increase in integrated GPU performance, while the top-end Core i7-1280P option will get you six P-cores and eight E-cores.

The rest of the Framework Laptop's hardware is staying mostly the same, though there are a few additional upgrades to be aware of. One is a 2.5Gbps Ethernet expansion card, the first wired LAN module to be available for the laptop. The card is based on Realtek's RTL8156 chipset and will be available "later this year." The company is also releasing a redesigned version of its top cover made with a new CNC manufacturing process that "substantially improv[es] rigidity." The new top cover will be the default option for all Framework Laptops going forward, though you can buy a new cover for your existing Framework Laptop for $89. You can view pricing and configuration info here.

An anonymous reader quotes a report from NewsNation: Blackouts could plague a number of states in the U.S. this summer, regulators warn, as a combination of drought, heat, potential cyber attacks, geopolitical conflicts and supply chain problems could disrupt the power supply, according to a grim new report (PDF) from the North American Electric Reliability Corporation (NERC). The regulatory body found that large swathes of the U.S. and parts of Canada are at an elevated or high risk of energy shortfalls during the summer's hottest months.

The Midwest is at especially high risk due to the retirement of older plants, which has caused a 2.3% decrease in capacity from last summer, as well as increased demand, according to NERC. In the Southwest, plummeting river levels may cripple hydropower production, the group warned, and in Texas drought-related heat events could cause extreme energy demand. A NERC map shows all states in the western half of the continental U.S., including North Dakota, South Dakota, Nebraska, Kansas, Oklahoma and Texas are at least under elevated risk of energy shortfalls, with parts of the northeastern-most states under high risk. Many states under the Midcontinent Independent System Operator (MISO), such as Arkansas, Louisiana, Michigan, Wisconsin, Iowa, Minnesota, Iowa, Illinois and Indiana are either entirely or partly at high risk. "Industry prepares its equipment and operators for challenging summer conditions. Persistent, extreme drought and its accompanying weather patterns, however, are out-of-the-ordinary and tend to create extra stresses on electricity supply and demand," said Mark Olson, NERC's manager of Reliability Assessments. "Grid operators in affected areas will need all available tools to keep the system in balance this summer."

The winner of this year's MIT $100K Entrepreneurship Competition is commercializing a new water desalination technology. MIT News reports: Nona Desalination says it has developed a device capable of producing enough drinking water for 10 people at half the cost and with 1/10th the power of other water desalination devices. The device is roughly the size and weight of a case of bottled water and is powered by a small solar panel. The traditional approach for water desalination relies on a power-intensive process called reverse osmosis. In contrast, Nona uses a technology developed in MIT's Research Laboratory of Electronics that removes salt and bacteria from seawater using an electrical current.

"Because we can do all this at super low pressure, we don't need the high-pressure pump [used in reverse osmosis], so we don't need a lot of electricity," says Crawford, who co-founded the company with MIT Research Scientist Junghyo Yoon. "Our device runs on less power than a cell phone charger." The company has already developed a small prototype that produces clean drinking water. With its winnings, Nona will build more prototypes to give to early customers. The company plans to sell its first units to sailors before moving into the emergency preparedness space in the U.S., which it estimates to be a $5 billion industry. From there, it hopes to scale globally to help with disaster relief. The technology could also possibly be used for hydrogen production, oil and gas separation, and more.

Top Chinese chipmaker Semiconductor Manufacturing International Co. says demand for mobile phones, personal computers and home appliances has dropped "like a rock" and shows no signs of recovering. From a report: Speaking to investors on Friday, CEO Zhao Haijun said the Russia-Ukraine war and China's COVID lockdowns have massively dented demand for consumer electronics and home appliances, which in turn has led to a "serious" adjustment in chip orders for those segments. "Many smartphone, PC and home appliance companies had exposure in Russia and Ukraine, and their revenues [from those markets] are now gone. Sales in their home market [of China] have also fallen due to the COVID situation domestically," Zhao said.

"We cannot yet see an end to the downtrends in these segments," Zhao added. "There are at least 200 million units of smartphones that will disappear suddenly this year and the majority of them are from our domestic Chinese phone makers." Demand for consumer electronics "dropped like a rock, very seriously," the executive said. "Some of our customers are holding more than five months of that type of inventory." However, Zhao said SMIC's factories are still running at 100% capacity, as the company has been allocating resources to products that are still in great shortage, such as power management chips and microcontrollers used in green energy, electric vehicles and industrial applications.

Uber on Monday said it launched pilot food delivery services with autonomous vehicles in two California cities, and said it was adding electric vehicle charging stations into its global driver app. From a report: The announcements are part of Uber's annual product event where the ride-hail and food delivery company showcases the latest updates to its app. Uber announced one food delivery service using autonomous cars, and a separate pilot using sidewalk robots. Both services are available to Uber Eats users in Santa Monica and West Hollywood in California, and consumers will have the ability to opt out of the programs. The autonomous car pilot is in collaboration with Motional, the self-driving joint venture of Hyundai and Aptiv, and was initially announced in December. read more It launched on Monday, Uber and Motional said. Uber said the sidewalk robots are provided by Serve Robotics, a spin-off of delivery company Postmates, which Uber acquired in 2020.

Slashdot reader Hmmmmmm shared this report from Hot Hardware: When Nvidia launched its Ampere Lite Hash Rate (LHR) graphics card with the feared Ethereum anti-mining limiter, the world knew it was only a matter of time before someone or a team cracked it. NiceHash, the company that designed the QuickMiner software and Excavator miner, has finally broken Nvidia's algorithm, restoring LHR graphics cards to their 100% Ethereum mining performance....

Graphics card pricing has been plummeting, and we're starting to see better availability at retailers, with some GPUs selling at or below Manufacturer Suggested Retail Price. So QuickMiner's arrival shouldn't influence the current state of the graphics market unless big corporations want to buy out everything in sight for the last push before Ethereum's transition to Proof-of-Stake (PoS), often referred to as "The Merge," is complete. We see that as unlikely, considering current profitability even on a 3080 Ti sits at around $3.50 per day and would still need nearly a year to break even at current rates. Initially scheduled for June, The Merge won't finalize until "the few months after," as Ethereum developer Tim Beiko has expressed on Twitter.

It will be interesting to see if Nvidia responds to this with updated drivers or implements LHRv3 in the remaining GPUs. However, it's perhaps not worth the effort at this point, and all existing LHRv2 and earlier cards can just stay on current drivers for optimized mining performance.

Friday a heat wave hit Texas — prompting the non-profit that manages power for Texas's 26 million customers to...ask them to use less of it.

"The Electric Reliability Council of Texas (ERCOT) made the appeal in a statement Friday, saying that soaring temperatures increased demand and caused six power generation facilities to trip offline," reports CNN. "That resulted in the loss of about 2,900 megawatts of electricity."

The statement asks Texans "to conserve power when they can by setting their thermostats to 78-degrees or above and avoiding the usage of large appliances (such as dishwashers, washers and dryers) during peak hours between 3 p.m. and 8 p.m. through the weekend." CNN reports: The appeal comes as record temperatures across most of the southern U.S. this weekend are expected to worsen a deepening drought. From Phoenix to Amarillo, Texas, record temperatures are expected to reach triple digits, with a chance for some parts of Texas to break daily records over the next seven days.

ERCOT came under scrutiny last year after record cold temperatures in February caused the state's highest electricity demand and more than 200 people died during the power crisis, with the most common cause of death being hypothermia. In March 2021, ERCOT's president and CEO, Bill Magness, was fired following widespread power outages during a series of winter storms that left many residents in the dark for days. Now the heat is testing Texas' power grid....

Temperatures from the mid-90s to the low 100s are expected on Sunday, with much of central and western Texas reaching 100 to 105 degrees — approximately 10 to 15 degrees above average.

"We do not need to plunge headlong into a nuclear future," argues Serhii Plokhy, author of the book Atoms and Ashes: From Bikini Atoll to Fukushima.

He notes Belgium's adding a 10-year extension to the life of two of its nuclear reactors, France's program to build 14 new reactors, and Boris Johnson's pledge to create supply 25% of the UKs power needs with nuclear energy by 2050. On the surface, the switch to nuclear makes sense. It would not only enable European countries to meet their ambitious net zero targets, since it produces no CO2. It would also make them less vulnerable to Russian threats, and allow them to stop financing the Russian war machine....

What the Russian takeover of [Ukraine] nuclear facilities exposed is a hazard inherent in all nuclear power. In order for this method of producing electricity to be safe, everything else in society has to be functioning perfectly. Warfare, economic collapse, climate change itself — all of these increasingly real risks make nuclear sites potentially perilous places. Even without them, the dangers of atomic fission remain, and we must ask ourselves: are they really worth the cost...?

Technological developments, growing international cooperation and rising safety standards did indeed do a great deal to ensure that no major nuclear accident occurred for 25 years after Chernobyl. But the Fukushima explosions demonstrated that such improvements have not eradicated the dangers surrounding nuclear power plants.... Can anything be done to make reactors safer? A new generation of smaller modular reactors, designed from scratch to produce energy, not to facilitate warfare, has been proposed by Bill Gates, and embraced, among others, by Macron. The reactors promised by Gates's TerraPower company are still at the computer-simulation stage and years away from construction. But his claim that in such reactors "accidents would literally be prevented by the laws of physics" must be taken with a pinch of salt, as there are no laws of war protecting either old or new reactors from attack.

There is also serious concern that the rapid expansion in the number of plants, advocated as a way of dealing with climate change, will increase the probability of accidents. While new technology will help to avoid some of the old pitfalls, it will also bring new risks associated with untried reactors and systems. Responsibility for dealing with such risks is currently being passed on to future generations.

This is the second great risk from nuclear power: even if a reactor runs for its lifetime without incident, you still have a lot of dangerous material left at the end of it. Fuel from nuclear power plants will present a threat to human life and the environment for generations to come, with the half-life of some radioactive particles measured in tens of thousands of years.... Nuclear power plants generally have no alternative to storing their high-level radioactive waste on site....If what we bury today in the New Mexico desert — the waste created by our nuclear ambitions — is so repulsive to us, why do we pass it on to others to deal with?
The author's counter-proposal: expanding the use of renewable energy: New research should be encouraged, grid infrastructure should be built up, and storage capacity increased. Billions that would otherwise go to new nuclear infrastructure, with all the attendant costs of cleanup that continue for decades and beyond, should be pumped instead into clean energy.

In the meantime, we obviously have an existing nuclear industry, and the solution is not to run away in panic, but to take good care of the facilities that already dot our countryside. We must not abandon the industry to its current state of economic hardship, as that would only mean inviting the next accident sooner rather than later.

Samsung is currently considering raising the cost of its semiconductor products by up to 20%, as well as those it manufactures for other companies, which would ultimately lead to consumers paying more for new devices. PC Magazine reports: As Bloomberg reports, the price hike consideration is in response to just about everything in the world getting more expensive, including the cost of raw materials and the logistics surrounding production pipelines. The final price increase is expected to be linked to sophistication of the components being manufactured, but that still means vendors will end up paying between 15-20% more for chips. Samsung is a huge player in the semiconductor industry, producing processors for a wide-range of industries, as well as memory products, storage solutions, and foundry solutions which allow other semiconductor products to be manufactured. Adding up to a 20% price rise across all those sectors will inevitably push up prices for any products that use Samsung components.

Facebook-owner Meta Platforms is preparing cutbacks in its Reality Labs division, a unit at the center of the company's strategy to refocus on hardware products and the "metaverse," a spokesperson confirmed to Reuters on Wednesday. From a report: Chief Technology Officer Andrew Bosworth told Reality Labs staffers during a weekly Q&A session on Tuesday to expect the changes to be announced within a week, according to a summary of his comments viewed by Reuters. The Meta spokesperson confirmed that Bosworth told staffers the division could not afford to do some projects anymore and would have to postpone others, without specifying which projects would be affected. She said Meta was not planning layoffs as part of the changes.

An anonymous reader quotes a report from Interesting Engineering: Researchers from the University of Cambridge have managed to run a computer for six months, using blue-green algae as a power source. A type of cyanobacteria called Synechocystis sp. PCC 6803 -- commonly known as "blue-green algae," which produces oxygen through photosynthesis when exposed to sunlight, was sealed in a small container, about the size of an AA battery, made of aluminum and clear plastic.

Christopher Howe from the University of Cambridge and colleagues claim that similar photosynthetic power generators could be the source of power for a range of small devices in the future, without the need for the rare and unsustainable materials used in batteries. The battery made of blue-green algae has provided a continuous current across its anode and cathode that ran a microprocessor. The computer ran in cycles of 45 minutes. It was used to calculate sums of consecutive integers to simulate a computational workload, which required 0.3 microwatts of power, and 15 minutes of standby, which required 0.24 microwatts. The microcontroller measured the device's current output and stored this data in the cloud for researchers to analyze.

Howe suggests that there are two potential theories for the power source. Either the bacteria itself produces electrons, which creates a current, or it creates conditions in which an aluminum anode in the container is corroded in a chemical reaction that produces electrons. The experiment ran without any significant degrading of the anode and because of that, the researchers believe that the bacteria is producing the bulk of the current. Howe says that the approach could be scaled up, but further research is needed to figure out how far. The research was published in the journal Energy & Environmental Science.

An anonymous reader quotes a report from Motherboard: Scientists have discovered evidence that a key rare resource, called helium-3, is potentially ten times more common on Earth than previously known -- though the source of all this extra supply remains mysterious, reports a new study. The finding is important because helium-3 could serve as a foundation of limitless clean power for our civilization, but has been seen as inaccessible since it is largely found in outer space locations, especially the Moon. Helium-3 is an isotope of helium, which means it contains the same number of protons as this common element but a different number of neutrons. This isotope is considered a potentially powerful energy source for future fusion reactors, making it a star of science fiction as well as a sought-out resource in the real world. However, while small amounts of the substance are produced by geological processes and from the fallout of nuclear weapons testing, there is thought to be very little helium-3 available on Earth.

Now, scientists led by Benjamin Birner, a postdoctoral scholar in geosciences at the University of California San Diego, have captured evidence for a previously unknown abundance of helium-3 in the atmosphere, which "presents a major puzzle in the helium-3 budget" and "motivates a search for missing helium-3 sources on Earth, especially since helium-3 is considered an important, yet scarce, resource," according to a study published on Monday in Nature Geoscience. Known sources of helium-3 on Earth only account for 10 percent of the surplus, the researchers said. Birner and his colleagues serendipitously uncovered this inferred surplus of helium-3 (3He) while tackling another challenging problem: measuring the overall rise in atmospheric helium as a result of human consumption of fossil fuels. The team pioneered a first-of-its-kind technique for estimating these anthropogenic helium emissions by examining another isotope, helium-4 (4He), which in turn led to the perplexing conclusion that there is some unknown source of helium-3 on our planet. "We only measured the change in atmospheric 4He," Birner said in an email. "However, previous work by other researchers indicates that the helium isotopic ratio of the atmosphere (3He/4He) is roughly stable. Together these observations imply an increase in atmospheric 3He that matches the rise in 4He or we would see a change in the atmospheric isotope ratio."

Helium-3 could be the ideal fuel for nuclear fusion, a potential energy source that mimics the same process that powers stars. Though nuclear fusion may not materialize as a practical power source for decades, assuming it is feasible at all, its potential to provide clean and limitless energy to the global human population makes it a tantalizing area of study. To that end, scientists across fields are likely to be interested in locating this unexplained surplus of helium-3 on Earth that has been implied by the new research. "That increase of 3He is quite puzzling because we don't have a good explanation for the source of this 3He so far," Birner noted. "It's quite an important puzzle to solve also because 3He is an important and scarce resource for nuclear fusion reactors. Based on the reported uncertainties in previous studies of the atmospheric 3He/4He trend, the buildup of 3He looks significant, but our study clearly motivates a closer look at the atmospheric 3He/4He trend."

Reuters reports: California energy officials on Friday issued a sober forecast for the state's electrical grid, saying it lacks sufficient capacity to keep the lights on this summer and beyond if heatwaves, wildfires or other extreme events take their toll....

California has among the most aggressive climate change policies in the world, including a goal of producing all of its electricity from carbon-free sources by 2045. In an online briefing with reporters, the officials forecast a potential shortfall of 1,700 megawatts this year, a number that could go as high as 5,000 MW if the grid is taxed by multiple challenges that reduce available power while sending demand soaring, state officials said during an online briefing with reporters. Supply gaps along those lines could leave between 1 million and 4 million people without power.

Outages will only happen under extreme conditions, officials cautioned, and will depend in part on the success of conservation measures.

"Extreme drought has drastically reduced reservoir levels and is causing a decline in electricity production from hydropower," reports the Washington Post.

"Yet while climate change has parched the West, these same forces have greatly increased precipitation in much of the Midwest, the South and the East. There, hydropower is gaining momentum, and supporters say that in many places it is poised for a big resurgence." And the Post sees this benefiting "a growing effort to retrofit so-called nonpowered dams, or any dams created for a need other than hydropower, for electricity production..." In 2016, a U.S. Department of Energy study forecast that hydropower in the United States could expand from its current capacity of 101 gigawatts to nearly 150 gigawatts by 2050. This growth would come not from new dam construction but from upgrading existing hydroelectric resources, adding pumped storage capacity, and retrofitting nonpowered dams for hydropower.... Nonpowered dams compose the vast majority of America's dam infrastructure. They can be found across the country, come in all sizes and were built to address a wide array of needs, including flood control, navigation, water supply and recreation.

Out of the estimated 90,000 dams in the United States, about 2,200 of them generate hydroelectric power. These hydropower resources, however, account for 7 percent of national energy production and contribute 37 percent of the nation's renewable energy supply....

Solar and wind produce energy intermittently, but hydropower can operate day or night, 24/7. Some hydropower facilities can shut down or ramp up energy production very quickly, providing energy grids with stopgap flexibility during peak demand or in the case of blackouts.... The addition of hydropower to nonpowered dams can be financially attractive to developers. Typically the dam's operation is not changed, so there is usually much less opposition from communities and environmental groups than there would be to a new dam project.
The article points out that last year's U.S. infrastructure funding included money to add hydropower to "nonpowered dams."

An anonymous reader quotes a report from Scientific American: During spring in the Pacific Northwest, meltwater from thawing snow rushes down rivers and the wind often blows hard. These forces spin the region's many power turbines and generate a bounty of electricity at a time of mild temperatures and relatively low energy demand. But much of this seasonal surplus electricity -- which could power air conditioners come summer -- is lost because batteries cannot store it long enough. Researchers at Pacific Northwest National Laboratory (PNNL), a Department of Energy national laboratory in Richland, Wash., are developing a battery that might solve this problem. In a recent paper published in Cell Reports Physical Science, they demonstrated how freezing and thawing a molten salt solution creates a rechargeable battery that can store energy cheaply and efficiently for weeks or months at a time.

Most conventional batteries store energy as chemical reactions waiting to happen. When the battery is connected to an external circuit, electrons travel from one side of the battery to the other through that circuit, generating electricity. To compensate for the change, charged particles called ions move through the fluid, paste or solid material that separates the two sides of the battery. But even when the battery is not in use, the ions gradually diffuse across this material, which is called the electrolyte. As that happens over weeks or months, the battery loses energy. Some rechargeable batteries can lose almost a third of their stored charge in a single month.

"In our battery, we really tried to stop this condition of self-discharge," says PNNL researcher Guosheng Li, who led the project. The electrolyte is made of a salt solution that is solid at ambient temperatures but becomes liquid when heated to 180 degrees Celsius -- about the temperature at which cookies are baked. When the electrolyte is solid, the ions are locked in place, preventing self-discharge. Only when the electrolyte liquifies can the ions flow through the battery, allowing it to charge or discharge. Creating a battery that can withstand repeated cycles of heating and cooling is no small feat. Temperature fluctuations cause the battery to expand and contract, and the researchers had to identify resilient materials that could tolerate these changes. [...] The result is a rechargeable battery made from relatively inexpensive materials that can store energy for extended periods. "Right now the experimental technology is aimed at utility-scale and industrial uses," notes the report. "The PNNL team plans to continue developing the technology, but ultimately it will be up to industry to develop a commercial product."