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Thermoacoustic heat pumps on the verge of commercial breakthrough

PV Magazine (International) Apr 23, 2026 by Emiliano Bellini
Processed Solar_Renewables

Dutch startup BlueHeart Energy is testing its thermoacoustic heat pump engine in residential settings, with a limited European launch expected in spring 2027, followed by gradual scaling. The system uses sound waves instead of refrigerants, aiming for quiet, flexible, low-maintenance heating suited especially for retrofits and renewable integration.

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<div class="feat-image"><img src="https://electrek.co/wp-content/uploads/sites/3/2019/04/Screen-Shot-2019-04-22-at-2.48.22-PM-1-e1555961353311.jpg?quality=82&#038;strip=all&#038;w=1587" /></div><p>During Tesla’s Q1 2026 earnings call, CEO Elon Musk revealed that Tesla is planning an “AI4.1 or AI4 Plus” upgrade to its self-driving computer that doubles the RAM from 16 gigabytes to 32 gigabytes per chip — taking the total system memory to 64 gigabytes.</p> <p>The announcement came on the same call where Musk confirmed (or rather reconfirmed after backing away from the admision last year) that HW3 “simply does not have the capability” for unsupervised FSD. </p> <p>For the millions of Tesla owners currently driving HW4 cars, the timing raises an uncomfortable question.</p> <a class="more-link" href="https://electrek.co/2026/04/23/tesla-hw4-plus-upgrade-will-hw4-follow-hw3/#more-464573">more…</a>

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Forecasting solar irradiance in urban environments with just one 360° image

PV Magazine (International) Apr 23, 2026 by Emiliano Bellini
Processed Solar_Renewables

U.S. scientists have developed a method to forecast solar irradiance at any location using a single high-resolution hemispherical image captured on-site. By extracting sky, sun, and surrounding scene information from visual cues, the approach enables accurate long-term energy prediction without relying on detailed 3D city models.

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Trump EPA Downplays Local Emissions in Proposed Repeal

CleanTechnica Apr 23, 2026 by Press Release
Processed Clean_Tech

<p>The EPA on Tuesday proposed rescinding a Biden-era ruling to reclassify Utah&#8217;s Wasatch Front from “serious” nonattainment of the 2015 ozone standards to mere “moderate” nonattainment, significantly decreasing required pollution reductions. The proposal downplays local emissions, shifting blame to foreign sources instead of reining in local emissions. EPA has issued ... [continued]</p> <p>The post <a href="https://cleantechnica.com/2026/04/23/trump-epa-downplays-local-emissions-in-proposed-repeal/">Trump EPA Downplays Local Emissions in Proposed Repeal</a> appeared first on <a href="https://cleantechnica.com">CleanTechnica</a>.</p>

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Multi-pyranometer tech improves solar irradiance measurements in the Arctic

PV Magazine (International) Apr 23, 2026 by Lior Kahana
Processed Solar_Renewables

Norwegian researchers have developed a multi-pyranometer method to more accurately estimate global tilted irradiance (GTI) in the Arctic by separating beam, diffuse, and reflected solar components. Validated in the world's northermost settlement, the approach was found to outperform conventional models in high-latitude conditions and improve PV system design for extreme environments.

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San Francisco helps home child care centers wean off gas

Canary Media Apr 23, 2026 by Alison F. Takemura
Processed Renewables_Storage

In January, Lerned Zint’s gas water heater croaked. It would have been an inconvenience for anyone. For Zint, a Spanish-speaking mother who runs Corazones Daycare out of her San Francisco home, it was an emergency. Zint takes care of about 10 children, 6 months to 4 years old. Their sticky fingers and stinky messes…

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An Ohio court may OK fracking-waste wells despite pollution concerns

Canary Media Apr 23, 2026 by Kathiann M. Kowalski
Processed Renewables_Storage

Ohio is a notoriously difficult state for building renewable energy. Many counties ban wind and solar outright, but even in those that don’t, state regulators often rely on local opposition to deny permits for developers. Fossil fuel companies, on the other hand, do not face these hurdles. This discrepancy is…

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This article originally appeared on Inside Climate News , a nonprofit, nonpartisan news organization that covers climate, energy and the environment. Sign up for their newsletter. Maryland lawmakers’ new solution for rising utility bills reduces a surcharge funding an effective energy-efficiency program, offers…

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Dutch buildings could host 36 GW of façade solar capacity

PV Magazine (International) Apr 23, 2026 by Emiliano Bellini
Processed Solar_Renewables

A new report from the Netherlands Enterprise Agency (RVO) estimates that building façades could offer up to 36 GW of technical solar PV potential, representing a significant but largely untapped resource. However, high costs, regulatory complexity, and lower performance compared to rooftop systems limit widespread adoption, currently making façade PV a niche solution for specific building types.

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<div class="feat-image"><img src="https://electrek.co/wp-content/uploads/sites/3/2026/04/Tesla-Cybercab-production.jpeg?quality=82&#038;strip=all&#038;w=1600" /></div><p>CEO Elon Musk confirmed during Tesla’s Q1 2026 earnings call that Cybercab production has officially begun at Giga Texas.</p> <p>VP of Vehicle Engineering Lars Moravy confirmed that the Cybercab will not be subject to NHTSA’s 2,500-vehicle annual production cap for autonomous vehicles.</p> <a class="more-link" href="https://electrek.co/2026/04/23/tesla-cybercab-production-starts-no-nhtsa-2500-vehicle-cap/#more-464559">more…</a>

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EU responds to energy price shocks with ‘homegrown’ clean energy push

PV Magazine (International) Apr 23, 2026 by Emiliano Bellini
Processed Solar_Renewables

The European Commission has launched the AccelerateEU strategy to address high energy prices driven by the Middle East conflict and its impact on fossil fuel markets. While specific measures for solar, renewables and storage are not yet clearly defined, the package includes the introduction of an Electrification Action Plan by summer.

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U.S. court blocks ‘de facto moratorium’ on federal solar permitting

PV Magazine (International) Apr 23, 2026 by Ryan Kennedy
Processed Solar_Renewables

A U.S. federal judge has issued a preliminary injunction against a Department of the Interior policy that required Trump-appointed Secretary of the Interior Doug Burgum’s approval for all renewable energy projects on public lands, effectively stalling tens of gigawatts of capacity.

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