Photosynthetic electron transport is tightly regulated to balance ATP and NADPH production and prevent over-reduction of the photosynthetic machinery. How this balance is maintained under severe ATP limitation, particularly under anoxia, is not fully resolved. Here, we used several deletion mutants of chloroplast ATP synthase subunits from Chlamydomonas reinhardtii to examine how electron flow is reorganized under anoxic conditions through the interplay between linear electron flow, cyclic electron flow, and alternative electron sinks. Using a combination of optical spectroscopy methods and membrane inlet mass spectrometry, we characterized changes in photosynthetic electron transport, proton motive force relaxation and gas exchange. Under oxic conditions, the {Delta}atpH mutant (lacking the c-subunit) showed strong acceptor-side limitation at photosystem I (PSI), whereas atpC1-2 (lacking the {gamma}-subunit) resembled the wild type. Under anoxia, this limitation was partially relieved, coinciding with sustained electron transport and prolonged hydrogen production. In particular, the {Delta}atpH mutant exhibited increased cyclic electron flow under oxic conditions and maintained PSI activity under anoxia despite impaired ATP synthesis. Prolonged hydrogen production was also observed in atpC1-2, which did not share the increased respiration of {Delta}atpH. Hydrogenase activity under anoxia is consistent with a role as an electron sink that may help alleviate PSI acceptor-side limitation and rebalance the redox state of the electron transport chain. These findings show that ATP synthase deficiency reorganizes photosynthetic electron flow and promotes prolonged hydrogen production, and point to hydrogenase as a candidate electron sink under energy-constrained conditions.

**Texas Hydrogen Plant Nears Operational Verification After Construction Delay** Construction of Total Hydrogen Solutions’ new hydrogen production facility near Katy, Texas, experienced a setback when a high-voltage cable was stolen during the facility’s late-stage build-out. The theft necessitated a complete replacement of the cable, disrupting the timeline for connecting the plant to the Electric Reliability

Phase engineering has proved effective in enhancing electrocatalytic performance by precisely controlling crystal structures. While significant efforts have been dedicated to phase regulation of activ...

Researchers at Edith Cowan University (ECU) have identified a potential low-emission energy source beneath Western Australia, where iron-rich formations may generate hydrogen naturally. The study focuses on magnetite, a mineral abundant in the Pilbara region, which can release hydrogen gas when reacting with hot water under high-pressure conditions. Experiments simulating deep-earth environments revealed that injecting solutions into banded iron formations could boost hydrogen production. This discovery suggests that Australia's vast iron ore deposits could become a major hydrogen export industry, offering a sustainable energy solution. The research highlights the potential for clean energy generation through geological processes, positioning Western Australia as a key player in the global transition to renewable energy. Scientists emphasize that further exploration is needed to quantify the resource's scale and viability, but the findings represent a significant step toward decarbonizing energy production.

House Bill 116, which would declare industrial splitting of water to make hydrogen not a 'beneficial use' under Wyoming water law, advanced out of committee 8–1 after the State Engineer warned that such a declaration could bar permitting and members asked staff to draft clarifying amendments about produced/wastewater and regional exceptions.

MIT engineers find making hydrogen from soda cans and seawater is scalable and sustainable. Their method’s overall carbon emissions are on par with those of other green hydrogen technologies.

Researchers reveal the intricate structure of a biohybrid catalyst that combines photosystem I with platinum nanoparticles to efficiently generate hydrogen fuel.