Chinese-made photovoltaic panels have fallen to roughly $0.12 per watt, down from about $5-$6 a watt around 2000, triggering a global boom in cheap distributed solar for homes, businesses and factories. That price collapse is driving rapid rooftop adoption in both developed and emerging markets: India added a record 44 GW of solar last year to reach about 154 GW of installed capacity and is projected to meet roughly half of its electricity demand growth through 2030; Australia now has panels on more than 4.3 million properties; and plug-and-play systems are gaining traction across Europe. The shift from centralized to decentralized generation is reshaping where and how electricity is produced, lowering costs and shortening payback times.
The impact is especially pronounced where grids are unreliable or expensive. In the Philippines residential rooftop capacity almost doubled year-on-year, with rooftop systems generating hundreds of gigawatt-hours in early 2026 and payback periods near three years. A Pakistani cement producer deployed 26 MW at one plant, supplying over a quarter of its electricity and cutting power costs by up to 40%. Africa is on pace for a record ~17 GW of solar installations in 2026 (about 45% y/y growth), driven largely by small-scale commercial and industrial rooftop systems. Cheap panels, supportive policies and favorable geography are accelerating industrialization and decentralization on solar power.
Summary generated by AI from the linked article. hn.today is not affiliated with Hacker News or Y Combinator.
Open-source framework scikit-decide, combined with aircraft performance models and wind data, can optimize flight paths to reduce jet fuel consumption. This approach has the potential to save airlines thousands of dollars on long-haul flights. (tech.marksblogg.com)
AI recently solved a version of the Navier-Stokes problem, but this does not mean mathematicians will become obsolete. The machine's achievement addressed a forced version of the problem, leaving the original unforced equations and deeper understanding still reliant on human mathematicians. (hxstem.substack.com)
Jean-Pierre Serre is a French mathematician celebrated for his work in algebraic topology, algebraic geometry, and number theory, turning 100 years old. He developed an early passion for mathematics, studying advanced problems in high school and earning top honors in competitions. (mathshistory.st-andrews.ac.uk)
Quantum computers will not instantly solve hard problems by trying all solutions in parallel, contrary to some misconceptions. AI progress over the past decade has confirmed many wild predictions, indicating that the Singularity has already begun in uneven ways. (scottaaronson.blog)
Medieval mathematicians kept their discoveries secret to secure social and professional advantages, often delaying publication. Today, the culture encourages open publication and sharing, though issues with academic publishing persist. (mathoverflow.net)
A new study suggests Venus may have once had a moon that was eventually pulled in and destroyed by the planet. The models indicate that Venus's early rotation and the moon's mass likely caused the moon to spiral into Venus over time. (nautil.us)
Today's best Hacker News stories, summarized and screenshotted, one email a day.