Long-time Slashdot reader schwit1 shares CNBC's report on the U.S. car market: Back in February, used electric vehicle prices dipped below used gasoline-powered vehicle prices for the first time ever, and the pricing cliff keeps getting steeper as car buyers reject any "premium" tag formerly associated with EVs. The decline has been dramatic over the past year. In June 2023, average used EV prices were over 25% higher than used gas car prices, but by May, used EVs were on average 8% lower than the average price for a used gasoline-powered car in U.S. In dollar terms, the gap widened from $265 in February to $2,657 in May, according to an analysis of 2.2 million one to five year-old used cars conducted by iSeeCars. Over the past year, gasoline-powered used vehicle prices have declined between 3-7%, while electric vehicle prices have decreased 30-39%. "It's clear used car shoppers will no longer pay a premium for electric vehicles," iSeeCars executive analyst Karl Brauer stated in an iSeeCars report published last week. Electric power is now a detractor in the consumer's mind, with EVs "less desirable" and therefore less valuable than traditional cars, he said. The article notes there's been a price war among EV manufacturers — and that newer EV models might be more attractive due to "longer ranges and improved battery life with temperature control for charging." But CNBC also notes a silver lining. "As more EVs enter the used market at lower prices, the EV market does become available to a wider market of potential first-time EV owners."

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sonlas writes: Germany's energy transition plan includes extensive interconnection projects to distribute its intermittent renewable energy production. However, these projects face significant challenges. The latest example is Sweden. One such project, Hansa PowerBridge, announced in 2017, intended to link Germany and Sweden via a 300 km HVDC line through the Baltic Sea. This 700 MW project, estimated at 600 million euro, aimed to stabilize Germany's volatile electricity prices. However, on June 14, 2024, Sweden rejected the project, citing incompatibility between the countries' electricity systems. The connection would link northern Germany to southern Sweden, an area with insufficient infrastructure. Concerns also arose about the volatile German market disrupting Sweden's and increasing local prices. Energy Minister Ebba Busch justified this decision by saying the German market is currently not efficient enough and a connection would risk leading to higher prices and a more unstable electricity market in southern Sweden. This highlights the difficulty Germany faces with its Energiewende, or energy transition model. This model leads to erratic electricity price behaviors and significant challenges in balancing production capacities. While a possible solution for Germany lies in interconnection with neighboring countries, the examples of Norway (which cancelled the NorGer project too) and Sweden show that from the perspective of these neighbors, it looks more like an "export of German problems" rather than a solution.

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French electricity prices turned negative due to a drop in demand and a surge in renewable energy output, prompting the grid operator to request that Electricite de France (EDF) take several nuclear reactors offline. Fortune reports: While more clean power is needed across Europe to reach climate goals, soaring renewables output and a lack of battery storage mean reactors sometimes have to be turned off during periods of low demand. It's becoming increasingly common around weekends in France -- which gets about two-thirds of its electricity from its atomic fleet -- and also occurs in the Nordic region and Spain. EDF halted its Golfech 2, Cruas 2 and Tricastin 1 nuclear plants, and plans to halt three others during the weekend. Some renewables producers will also have to curb generation to avoid paying a fee amid negative prices. French day-ahead power fell to -5.76 euros a megawatt-hour, the lowest in four years, in an auction on Epex Spot. Germany's equivalent contract dropped to 7.64 euros.

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Rocio Fabbro reports via Quartz: TDK, the largest maker of smartphone batteries in the world, said Monday that it has successfully developed a material that could be used in a new battery with "significantly higher energy density" than its existing cells. Energy density refers to how much energy a battery can store relative to its size or weight. The material will be used in TDK's CeraCharge solid-state battery, which it says has an energy density of 1,000 watt-hours per liter -- approximately 100 times more than its conventional solid-state battery. These batteries use an oxide-based solid electrolyte, in contrast with the liquid electrolyte used in lithium-ion batteries that are widely found in electronic devices, making them "extremely safe." Solid-state batteries are smaller, charge faster, last longer, and have a lower risk of damage from temperature changes. "Smaller size and higher capacitance contribute to smaller device size and longer operating time," the Tokyo-based company said. The battery is designed to replace coin cell primary batteries, such as those found in wearable devices like wireless headphones, smartwatches, and hearing aids. The new batteries would be rechargeable, in compliance with new European Union battery regulations that are aimed at reducing the environmental impact of batteries. TDK said it's working toward mass production of solid-state batteries, and beefing up the batteries' capacity using multi-layer lamination technology and expanding their operating temperature range.

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Researchers have devised a way to extract energy from the photosynthesis process of algae, according to an announcement from Concordia University. Suspended in a specialized solution, the algae forms part of a "micro photosynthetic power cell" that can actually generate enough energy to power low-power devices like Internet of Things (IoT) sensors. "Photosynthesis produces oxygen and electrons. Our model traps the electrons, which allows us to generate electricity," [says Kirankumar Kuruvinashetti, PhD 20, now a Mitacs postdoctoral associate at the University of Calgary.] "So more than being a zero-emission technology, it's a negative carbon emission technology: it absorbs carbon dioxide from the atmosphere and gives you a current. Its only byproduct is water." [...] Muthukumaran Packirisamy, professor in the Department of Mechanical, Industrial and Aerospace Engineering and the paper's corresponding author, admits the system is not yet able to compete in power generation with others like photovoltaic cells. The maximum possible terminal voltage of a single micro photosynthetic power cell is only 1.0V. But he believes that, with enough research and development, including artificial intelligence-assisted integration technologies, this technology has the potential to be a viable, affordable and clean power source in the future. It also offers significant manufacturing advantages over other systems, he says. "Our system does not use any of the hazardous gases or microfibres needed for the silicon fabrication technology that photovoltaic cells rely on. Furthermore, disposing of silicon computer chips is not easy. We use biocompatible polymers, so the whole system is easily decomposable and very cheap to manufacture." In the paper the researchers also described it as a âoemicrobial fuel cellâ...

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French photovoltaics group Hespul tested solar panels installed in 1992, reports PV Magazine: The testing showed that the modules still produce on average 79.5% of their initial power after 31 years of operation. In a previous testing carried out 11 years ago, the panels were found to produce 91.7% of their initial power. "This result exceeds the performance promised by the manufacturers who said the panels would have maintained 80% of their output after 25 years," said Hespul. The drop in performance is on average 20.5%, or 0.66% per year over 31 years, and 1.11% per year over the last 11 years... Another more recent study carried out by the US Department of Energy's National Renewable Energy Laboratory (NREL) on 1,700 American sites totaling 7.2 GW of power, showed a median degradation of around -0.75%/year. Moveover, another research study focused on 4,300 residential installations in operation in Europe and used different data processing methodologies. Depending on the methods, a median loss of -0.36% to -0.67%/year was obtained. Thanks to long-time Slashdot reader storkus for sharing the news.

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The Energy Information Administration (EIA) expects Americans' monthly electricity bills to average $173 between June through August, compared to $168 last summer. "The slight bump in costs comes from consumers cranking up their air conditioning more to cope with a warmer season than last year," writes The Verge's Justine Calma. "Bills would have jumped higher, if not for lower residential electricity prices helping to balance out some of the increased energy use from air conditioning." From the report: Some regions are likely to be harder hit by the weather than others. Because of heat and humidity along the Gulf Coast, residents in Southern states typically use the most electricity in the summer to cool their homes. The Pacific Coast, meanwhile, faces the biggest potential percentage increase in retail electricity prices in the nation -- a 7 percent jump since last year. Wholesale electricity costs there have risen since 2022, in part because of a heat and drought-induced shortfall in hydroelectricity generation. Households along the Pacific could see their electricity bills go up an average of $11 per month this summer, according to the EIA. To be sure, the EIA says that weather is "the main source of uncertainty" in its forecasts for folks' utility bills. If this summer winds up being hotter than expected, households could wind up paying even more. Residential electricity use typically peaks in the summer for most of the US because of air conditioning. Extreme heat can even trigger power outages if demand suddenly rises too sharply. California, the Southwest, the Midwest, Texas, and New England are at "elevated risk" of electricity supply shortages during any extreme weather this summer, according to an assessment (PDF) by the North American Electric Reliability Corporation.

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Automakers are exploring energy storage as a way to help utilities and save customers money, turning an expensive component into an industry asset.

© Laetitia Vancon for The New York Times

The kingdom is trying to juggle its still-vital petroleum industry with alternative energy sources like wind and solar as it faces pressure to lower carbon emissions.

© Iman Al-Dabbagh for The New York Times

Officials said the decision would lower bills and encourage people to use cars and appliances that did not use fossil fuels, but some experts said it would discourage energy efficiency.

© Jim Wilson/The New York Times